CN105934065B - Acceleration system for low energy pulse positron beam group - Google Patents
Acceleration system for low energy pulse positron beam group Download PDFInfo
- Publication number
- CN105934065B CN105934065B CN201610330579.7A CN201610330579A CN105934065B CN 105934065 B CN105934065 B CN 105934065B CN 201610330579 A CN201610330579 A CN 201610330579A CN 105934065 B CN105934065 B CN 105934065B
- Authority
- CN
- China
- Prior art keywords
- high pressure
- accelerating cavity
- pulse
- low energy
- beam group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H5/00—Direct voltage accelerators; Accelerators using single pulses
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Particle Accelerators (AREA)
Abstract
This application involves the acceleration systems rolled into a ball for low energy pulse positron beam.It is a kind of for low energy pulse positron beam group acceleration system include high_voltage isolation vacuum chamber, the high pressure accelerating cavity being arranged in the high_voltage isolation vacuum chamber, be arranged in the high_voltage isolation vacuum chamber and in the high pressure accelerating cavity downstream outgoing electrode and pulsed high voltage generator.Pulsed high voltage generator is used to apply high pressure to the high pressure accelerating cavity to accelerate low energy pulse positron beam group.The technical solution of the application effectively reduces the difficulty of high_voltage isolation.
Description
Technical field
This disclosure relates to particle acceleration technique, in particular to the acceleration system rolled into a ball for low energy pulse positron beam
And method.
Background technique
Pulse charged particle beam group can be divided into pulsed ionizing beam group, pulsed electron beam group and pulse positron beam group.Low energy
Charged particle is often referred to charged particle of the energy within the scope of several hundred KeV.The device for realizing that charged particle energy is adjusted is referred to as
Acceleration system.Pulse charged particle beam group is on the surface of the material in the fields such as modification, nuclear physics, plasma physics and aerospace
Have a wide range of applications and nuclear technology field in important technology method.
Positron annihilation technique is the research method for lossless detection material microdefect information risen the nearly more than ten years.
Slow positron beam Flow Technique is that the relevant technologies such as positron slowing-down, Shu Tuanhua, pack and acceleration are introduced in conventional method, to just
Electronic beam current state carry out controllable adjustment, realize material microdefect information with depth distribution research, and be positive electron conduct
The basic research of antimatter provides technical support.
For the energy of the Slow positron generally used usually in 0~50keV range, production principle is fast positive electron (radiation
Property isotope generate) or high energy positron (electron linear accelerator high energy electron practice shooting generate) by slow body (such as monocrystalline or
The solid inert gas blanket formed under polycrystalline tungsten, copper or nickel sheet metal or low temperature) when, occur with the atom and molecule of slow body
Inelastic collision off-energy, rapid slowing down is to warm-up movement state within the time of about ps, and the positive electron after thermalization is with relatively
The long service life (10-10S) it spreads in substance, is emitted from substance as Slow positron with certain probability.Metal slowing down effect
Rate is 10-3~10-5, and solid inert gas blanket moderating efficiency is up to 10-2。
With a set of Low-energy Positron lattice (Ne based on solid neon slow body+Beam for), system 50mCi
's22When Na positron source, energy is the positive electron flux of several eV up to 5 × 106e+/ s, the Low-energy Positron of outgoing is by quiet
The extraction of electric field and the focusing in magnetic field form the direct current Low-energy Positron line moved along parallel magnetic field direction.Further use
Penning trap (Penningtrap) method based on buffer gas technology forms direct current Low-energy Positron beam burst Shu Tuanhua
Positive electron plasma, intensity is up to 106e+, about 0.05eV can be dissipated.Using rotating electric field by positive electron plasma radial pressure
Positive electron plasma transverse compression is greatly shortened the time width of plasma, improves its surface density by contracting, buncher cavity,
It can finally obtain that repetition rate within the scope of 0.5~500Hz is adjustable, the arteries and veins of most short reachable 2ns, the beam spot diameter, about 1mm of time width
Rush positron beam group.
Slow positron measurement be by change positive electron acceleration voltage come realize to measurement sample depth scan.From poly-
What the positron beam group energy of beam chamber outgoing was usually fixed, it needs to accelerate positive electron.Currently, being used for low energy pulse positron beam
Group's acceleration technique is mainly that electrostatic accelerates, and divides positive high voltage and negative high voltage two ways.Positive high voltage mode, before entire lattice
End necessarily just is on high potential, i.e., vacuum equipment, magnetic field and control of all line line front ends etc. are right all on high potential
Its control, measurement, the power supply of equipment all has to high_voltage isolation；Especially for above-mentioned Slow positron chopping system, arteries and veins
It rushes beam group and is not available the acceleration of electrostatic positive high voltage at all, if carrying out positive high voltage acceleration to the direct current positron beam stream before chopping,
Then chopping system can not work.Negative high voltage mode adds negative high voltage on measurement sample, since sample needs load negative
High pressure (is higher than 0.1kV, such as 0.5-50kV), thus, to carry out the processes such as on-line heating, deformation to sample just must be these
Equipment carries out high_voltage isolation；The safety of system on human body, atmospherical discharges of equipment on high potential etc. are also required to consider；In addition,
For insulator sample, the load of negative high voltage is with regard to highly difficult, and meeting stored charge in sample, influences further to measure.
For these reasons, improved acceleration system and method to low energy pulse positron beam group is needed.Similarly, for
Other low energy pulse charged particle beam groups, it is also desirable to improved acceleration system and method.
Above- mentioned information are only used for reinforcing the understanding to the background of the disclosure, therefore it disclosed in the background technology part
It may include the information not constituted to the prior art known to persons of ordinary skill in the art.
Summary of the invention
The application discloses a kind of acceleration system and method for low energy pulse positron beam group, can be effectively reduced high pressure
The difficulty of isolation.
According to one aspect of the disclosure, a kind of acceleration system for low energy pulse positron beam group is provided, comprising:
High_voltage isolation vacuum chamber；
High pressure accelerating cavity is arranged in high_voltage isolation vacuum chamber；
It is emitted electrode, is arranged in high_voltage isolation vacuum chamber and is in the downstream of high pressure accelerating cavity；
Pulsed high voltage generator, for high pressure accelerating cavity apply high voltage pulse to accelerate low energy pulse positron beam group,
Wherein, the high_voltage isolation vacuum chamber and the outgoing electrode are connected to ground potential, the high_voltage isolation vacuum chamber
Coaxial annular capacitor is constituted between the accelerating cavity, and pulsed high voltage generator is configured that and has rolled into a ball in low energy pulse positron beam
Enter before high pressure accelerating cavity entirely, high pressure accelerating cavity is made to be in ground potential；It rolls into a ball in low energy pulse positron beam completely into high pressure
After accelerating cavity, apply high voltage pulse to high pressure accelerating cavity；After low energy pulse positron beam group initially enters outgoing electrode,
High pressure accelerating cavity is set to drop to ground potential.
According to some embodiments, the repetition frequency of high voltage pulse frequency and low energy pulse the positron beam group of pulsed high voltage generator
Rate is consistent.
According to some embodiments, acceleration system further include: pulse positron source component, for emitting low energy pulse positive electron
Beam group.
According to some embodiments, pulse positron source component is arranged in high_voltage isolation vacuum chamber or sealing vacuum system
In, sealing vacuum system is connect with high_voltage isolation vacuum chamber.
According to some embodiments, acceleration system further include: synchronous generator, synchronous generator is to pulse positive electricity
Source component (including buncher cavity) provides waveform signal, and using waveform signal delay scheduled delay tm as to high voltage pulse
The first trigger signal that power supply provides guarantees synchronous with the time signal that positron beam is rolled into a ball.
According to some embodiments, the length L of high pressure accelerating cavity is greater than shortest length Lmin, shortest length LminBy being applied to height
The high pressure of pressure accelerating cavity reaches the rise time tr of peak value and the initial velocity of low energy pulse positron beam group determines.
According to some embodiments, pulse positron source component is equal to low energy pulse positive electron with high pressure accelerating cavity distance S1
The difference of the length L of the focusing distance and high pressure accelerating cavity of beam group.
According to some embodiments, the high pressure applied to high pressure accelerating cavity emits next low energy arteries and veins in pulse positron source component
Ground potential is dropped to before rushing positron beam group.
According to some embodiments, scheduled delay tm is determined by the primary power that distance S1 and low energy pulse positron beam are rolled into a ball
It is fixed, it is ensured that after pulse positive electron is completely into high pressure accelerating cavity, accelerating cavity just to be made to load high voltage.
According to some embodiments, low energy pulse positron beam group is Low-energy Positron beam group, and pulsed high voltage generator is pulse
Positive high voltage power supply.
It is effectively reduced according to some embodiments of the present disclosure since high pressure accelerating cavity is in high_voltage isolation vacuum chamber
The difficulty of high_voltage isolation.
In addition, become independent a part since acceleration system is separated from other systems, facilitate other systems into
Row multiple diversity operation improves the safety and stability of high pressure accelerated mode.
Other characteristics and advantages of the disclosure will be apparent from by the following detailed description, or partially by the disclosure
Practice and acquistion.
Detailed description of the invention
Its example embodiment is described in detail by referring to accompanying drawing, the above and other feature and advantage of the disclosure will become more
Add obvious.
Fig. 1 schematically shows the acceleration system according to an embodiment of the invention for low energy pulse charged particle beam group；
Fig. 2 schematically shows the acceleration system according to another embodiment of the present invention for low energy pulse charged particle beam group
System；
Fig. 3 schematically shows the acceleration system according to another embodiment of the present invention for low energy pulse charged particle beam group
System；
Fig. 4 schematically shows the process of acceleration low energy pulse charged particle beam according to an embodiment of the present invention group；And
Fig. 5 shows the schematic equivalent circuit diagram of pulsed high voltage generator according to an embodiment of the invention.
Specific embodiment
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be real in a variety of forms
It applies, and is not understood as limited to embodiment set forth herein；On the contrary, thesing embodiments are provided so that the disclosure will be comprehensively and complete
It is whole, and the design of example embodiment is comprehensively communicated to those skilled in the art.Identical appended drawing reference indicates in figure
Same or similar part, thus repetition thereof will be omitted.
In addition, described feature, structure or characteristic can be incorporated in one or more implementations in any suitable manner
In example.In the following description, many details are provided to provide and fully understand to embodiment of the disclosure.However,
It will be appreciated by persons skilled in the art that can with technical solution of the disclosure without one or more in specific detail,
Or it can be using other acceleration systems, constituent element, material, device, step etc..In other cases, it is not shown in detail or retouches
Known features, acceleration system, device, realization, material or operation are stated to avoid fuzzy all aspects of this disclosure.
Block diagram shown in the drawings is only functional entity, not necessarily must be corresponding with physically separate entity.
I.e., it is possible to realize these functional entitys using software form, or realized in one or more hardware modules or integrated circuit
These functional entitys, or these functional entitys are realized in heterogeneous networks and/or processor device and/or microcontroller device.
Flow chart shown in the drawings is merely illustrative, it is not necessary to including all steps.For example, the step of having
It can also decompose, and the step of having can merge or part merges, therefore the sequence actually executed is possible to according to the actual situation
Change.
Fig. 1 schematically shows the acceleration system according to an embodiment of the invention for low energy pulse charged particle beam group.
As shown in Figure 1, including that high pressure is (high according to the acceleration system for low energy pulse charged particle beam group of an embodiment
In 0.1kV, such as 0.5-50kV) isolated vacuum chamber 110, high pressure accelerating cavity 120, outgoing electrode 140 and pulsed high voltage generator
(HV)150.Acceleration system may also include the field coil 130 around high_voltage isolation vacuum chamber 110.
As shown in Figure 1, high pressure accelerating cavity 120 and outgoing electrode 140 are arranged in high_voltage isolation vacuum chamber 110, radio out
Pole 140 is set at the downstream of high pressure accelerating cavity 120, the i.e. downstream of charged particle beam group direction of travel.High_voltage isolation vacuum
The effect of chamber 110 first is that the high pressure on high pressure accelerating cavity 120 can be completely cut off.
Pulsed high voltage generator 150 may be electrically connected to high pressure accelerating cavity 120, in a triggered to high pressure accelerating cavity 120
Apply high voltage pulse to accelerate low energy pulse charged particle beam group.
According to an embodiment, high_voltage isolation vacuum chamber 110 and outgoing electrode 140 are connected to ground potential.
Acceleration system according to an embodiment of the present invention, since high pressure accelerating cavity 120 is in high_voltage isolation vacuum chamber 110,
It can effectively reduce the difficulty of high_voltage isolation.In addition, since the acceleration system for including high pressure accelerating cavity 120 is separated from other systems
Out, become independent a part, facilitate other systems carry out multiple diversity operation, improve high pressure accelerated mode safety and
Stability.
Acceleration system according to an embodiment of the present invention can be used for accelerating various pulse charged particle beams group, such as pulse positive electron
Beam group or pulsed electron beam group.It can be readily appreciated that pulsed high voltage generator 150 can be pulse when accelerating positively charged particle beams group
Positive high voltage power supply, and when accelerating electronegative particle beams group, pulsed high voltage generator 150 can be pulse negative high voltage power source.
Fig. 2 schematically shows the acceleration system according to another embodiment of the present invention for low energy pulse charged particle beam group
System.
As shown in Fig. 2, may include particle source system 202, pulse charged particle source portion according to the acceleration system of the present embodiment
Part 204 and 206, the acceleration system 100 described referring to Fig.1 and the vacuum chamber 270 for placing sample 280.
Particle source system 202 is for generating low energy charged particle.According to some embodiments, particle source system 202 be can be
Based on solid neon slow body positron source system, but the present disclosure is not limited thereto.
Pulse charged particle source block 204 and 206 can emit low energy pulse charged particle beam group.According to some embodiments,
Pulse charged particle source block 204 and 206 may include penning trap Shu Tuanhua system 204 based on buffer gas and based on rotation wall
The compressibility 206 of technology and buncher cavity, but the present disclosure is not limited thereto.
According to some embodiments, pulse charged particle source block 204 and 206 be may be provided in sealing vacuum system, and be somebody's turn to do
Sealing vacuum system can be connect with high_voltage isolation vacuum chamber 110, such as pass through vacuum sealing mode.
Fig. 3 schematically shows the acceleration system according to another embodiment of the present invention for low energy pulse charged particle beam group
System.
As shown in figure 3, may include high_voltage isolation vacuum chamber 310 and setting in high pressure according to the acceleration system of the present embodiment
Pulse charged particle source block, high pressure accelerating cavity 320 and outgoing electrode 340 in isolated vacuum chamber 310.In addition, the acceleration system
It unites and may also include pulsed high voltage generator (HV) 350, synchronous generator 308 and delay element 360, but the present disclosure is not limited to
This.
Pulse charged particle source block can emit low energy pulse charged particle beam group.According to some embodiments, pulse electrification
Particle source block may include the penning trap Shu Tuanhua system 304 based on buffer gas and the pressure based on rotation wall technology and buncher cavity
Compression system 306, but the present disclosure is not limited thereto.
Synchronous generator 308 provides waveform signal to pulse charged particle source block.The waveform signal can be by prolonging
Slow element 360 postpones a scheduled delay, as the trigger signal provided to pulsed high voltage generator 350.Pulsed high voltage generator
350 be triggered signal triggering after can to high pressure accelerating cavity 320 apply high voltage pulse, to accelerate low energy pulse charged particle beam
Group.
Acceleration system according to an embodiment of the present invention, pulse charged particle source block, high pressure accelerating cavity 320 and outgoing electrode
340 can be arranged in high_voltage isolation vacuum chamber 310, so as to keep system more compact.
Below for accelerating Low-energy Positron beam to roll into a ball, illustrate the accelerator using acceleration system shown in FIG. 1.
Referring to fig. 2-4, particle source system 202 can be pulse positron source.Pulse positron source emits Low-energy Positron
Line.Low-energy Positron line is for example, by the penning trap Shu Tuanhua system 304 based on buffer gas and based on rotation wall technology
It by Shu Tuanhua and is emitted with the compressibility 306 of buncher cavity.Pulse positron beam group can have pulse width tw, and (beam is rolled into a ball
Time span).
High pressure accelerating cavity 320 is ground potential at this time.The incidence of the exit end distance high-voltage accelerating cavity 320 of compressibility 306
There is a distance S1 at end, and positron beam group drifts about after a period of time tm, enters high pressure accelerating cavity 320 along magnetic direction.
In order to shorten the length L of high pressure accelerating cavity 320 as far as possible, can roll into a ball in positron beam completely into high pressure accelerating cavity
After 320, pulsed high voltage generator 350 applies positive high voltage to high pressure accelerating cavity 320 immediately.
As before, synchronous generator 308 provides waveform signal to pulse charged particle source block, which can lead to
It crosses delay element 360 and postpones a scheduled delay, as the trigger signal provided to pulsed high voltage generator 350.High voltage pulse
Power supply 350, which is triggered after signal triggers, to apply high voltage pulse to high pressure accelerating cavity 320.Delay time tm can be by compressibility
Incidence end distance S1 and positron beam the group primary power of 306 exit end and high pressure accelerating cavity 320 determine.
Since the positron beam group in high pressure accelerating cavity 320 is in an equipotentiality space, positron beam group accelerates in high pressure
Remain a constant speed movement in chamber 320.The shortest length L of high pressure accelerating cavity 320minPulse is determined with the initial velocity of positron beam group
Positive high voltage reaches the rise time tr of peak value.Accelerate cavity length L shorter, then rise time tr is smaller, but this is to pulsed high-voltage
The requirement in source 350 is also higher.
The sum of length L of distance S1 and high pressure accelerating cavity 320 is related with the focusing distance that beam is rolled into a ball, and focusing distance is generally fixed
It is constant.After determining L value, S1 can be obtained accordingly.
By rise time tr, after the pulse positive high voltage of high pressure accelerating cavity 320 reaches peak value, high pressure accelerating cavity 320 and ground
Potential difference is formed between the outgoing electrode 340 of current potential.Positron beam group accelerates to obtain in the electric field after the outgoing of high pressure accelerating cavity 320
Obtain kinetic energy.When reaching the position of outgoing electrode 340, the energy that positron beam group obtains is maximum.
Positive high voltage peak value on high pressure accelerating cavity 320 should remain to positron beam group initially enter outgoing electrode 340 after,
Zero potential can be begun to decline.Therefore, in the case where positron beam group initial velocity is certain, when the most short maintenance of high-pressure peak
Between tp by high pressure accelerating cavity 320 and outgoing electrode 340 between potential difference and distance S2 determine.Distance S2 generally immobilizes.
Generally it can estimate that longest is held time with least energy (100eV)；Meanwhile fall time need to be guaranteed in the time of synchronization signal
It is spaced within T, that is, high pressure accelerating cavity 320 can be can smoothly enter into order to guarantee that next positron beam is rolled into a ball, on high pressure accelerating cavity 320
Positive high voltage next synchronization signal triggering before drop to ground potential.
As shown in figure 4, after the completion of the accelerator of positron beam group next positron beam group can be carried out as preceding
Accelerator, it is so recyclable reciprocal.Pulsed high voltage generator is directly triggered by synchronization signal, as long as guaranteeing the time of positive high voltage
Width the sum of (rise time, peak value hold time with fall time) is within the scope of synchronization signal time interval.Positron beam group
It can be periodically, it can also be acyclic.
According to an embodiment of the invention, acceleration system is mutually indepedent with other systems, avoiding negative high voltage mode can be to sample
The interference of product.
According to an embodiment of the invention, the frequency for being applied to the pulse positive high voltage of high pressure accelerating cavity 320 can be with pulse positive electricity
The repetition rate of beamlet group is consistent, and before positron beam is rolled into a ball and reaches high pressure accelerating cavity, high pressure accelerating cavity is in ground potential；When just
After electron beam group is completely into high pressure accelerating cavity, applies positive high voltage to high pressure accelerating cavity 320, can guarantee that positron beam group passes through
High pressure accelerating cavity obtains kinetic energy.
According to embodiment, coaxial annular capacitor, charge and discharge can be equivalent between high pressure accelerating cavity 320 and vacuum chamber 310
The rising and falling time of speed influence high voltage pulse.
According to column annular capacitor calculation formula
The length L of high pressure accelerating cavity 320 is bigger, and high pressure accelerating cavity 320 and 310 distance d of vacuum chamber are smaller, equivalent capacity
C is bigger, and wherein D is the internal diameter of vacuum chamber.
Again by capacitor charge and discharge time formula
T=RC × ln [V0/V0-Vt],
Capacitor C is bigger, and the charge and discharge time is longer.Therefore, in order to shorten the charge and discharge time, L can be designed small as far as possible, and d is set
It counts big as far as possible.
In addition, need to consider to avoid the electric discharge between high pressure accelerating cavity high pressure and vacuum chamber ground potential to influence.If high pressure accelerates
Chamber maximum high-voltage is 30kV, and striking distance is 10mm in high vacuum environment, considers that high pressure accelerating cavity wall thickness (1.5mm) and beam roll into a ball diameter
To width (1mm), then d should be between 11~15mm.
Tables 1 and 2, which is shown, rolls into a ball parameter according to the acceleration system parameter and pulse positron beam of an embodiment.
Table 1
Table 2
Fig. 5 shows the schematic equivalent circuit diagram of pulsed high voltage generator according to an embodiment of the invention.
As shown in figure 5, the HTS300 pulse of Behlke company production can be used according to the pulsed high voltage generator of the present embodiment
High pressure generator, ceiling voltage/electric current are 30kV/30A, and the unlatching and closure of HTS are triggered by TTL trigger signal.
As shown in figure 5, RLFor current-limiting resistance, CBFor load capacitance, HTS, which is disconnected, generates high pressure, CBBand high pressure, HTS closure are high
Pressure disappears, CBHigh pressure is discharged by current-limiting resistance to decay, and time to peak longest is up to 150ns, rise time and trigger signal
Response time it is related.
For L in Tables 1 and 2min=20mm, S2The rise time of the design parameter of=10mm, d=11mm, high pressure is
9.7ns, peak value high pressure most short hold time (can extend) for 4.4ns, and total time is most short according to the pulse spacing to be within 15ns
2ms can guarantee enough high pressure die-away times, and the pulsed high voltage generator of the embodiment can meet demand.
By above detailed description, those skilled in the art it can be readily appreciated that according to the system of the embodiment of the present disclosure and
Acceleration system has one or more of the following advantages.
Embodiment according to the present invention, high pressure accelerating cavity is in high_voltage isolation vacuum chamber, can effectively reduce high pressure every
From difficulty.In addition, becoming independent one since the acceleration system for including high pressure accelerating cavity is separated from other systems
Point, facilitate other systems to carry out multiple diversity operation, improves the safety and stability of high pressure accelerated mode.
According to an embodiment of the invention, acceleration system is mutually indepedent with other systems, avoiding negative high voltage mode can be to sample
The interference of product.
According to some embodiments of the present invention, pulse charged particle source block, high pressure accelerating cavity and outgoing electrode can be all provided with
It sets in high_voltage isolation vacuum chamber, so as to keep system more compact.
According to some embodiments of the present invention, the frequency for being applied to the high voltage pulse of high pressure accelerating cavity can be with pulse band electrochondria
The repetition rate of beamlet group is consistent, and before pulse charged particle beam is rolled into a ball and reaches high pressure accelerating cavity, high pressure accelerating cavity is in ground electricity
Position；After pulse charged particle beam is rolled into a ball completely into high pressure accelerating cavity, applies high pressure to high pressure accelerating cavity, can guarantee pulse band
Electrochondria beamlet group obtains kinetic energy by high pressure accelerating cavity.
It will be understood by those skilled in the art that attached drawing is the schematic diagram of example embodiment, module or process in attached drawing
Necessary to not necessarily implementing the disclosure, therefore it cannot be used for the protection scope of the limitation disclosure.
It will be appreciated by those skilled in the art that above-mentioned each module can be distributed in device according to the description of embodiment, it can also
It is located in one or more devices different from the present embodiment with carrying out corresponding change.The module of above-described embodiment can be merged into
One module, can also be further split into multiple submodule.
It is particularly shown and described the exemplary embodiment of the disclosure above.It should be understood that the present disclosure is not limited to institute's public affairs
The embodiment opened, on the contrary, the disclosure is intended to cover comprising various modifications in the spirit and scope of the appended claims and wait
Effect arrangement.
Claims (7)
1. a kind of acceleration system for low energy pulse positron beam group characterized by comprising
High_voltage isolation vacuum chamber；
High pressure accelerating cavity is arranged in the high_voltage isolation vacuum chamber；
It is emitted electrode, is arranged in the high_voltage isolation vacuum chamber and is in the downstream of the high pressure accelerating cavity；
Pulsed high voltage generator, for the high pressure accelerating cavity apply high voltage pulse to accelerate low energy pulse positron beam group,
Wherein, the high_voltage isolation vacuum chamber and the outgoing electrode are connected to ground potential, the high_voltage isolation vacuum chamber and institute
Composition coaxial annular capacitor between accelerating cavity is stated, and
The pulsed high voltage generator is configured that
Before low energy pulse positron beam is rolled into a ball completely into the high pressure accelerating cavity, the high pressure accelerating cavity is made to be in ground electricity
Position；
After low energy pulse positron beam is rolled into a ball completely into the high pressure accelerating cavity, it is high to apply pulse to the high pressure accelerating cavity
Pressure；
After low energy pulse positron beam group initially enters the outgoing electrode, the high pressure accelerating cavity is made to drop to ground electricity
Position.
2. acceleration system as described in claim 1, which is characterized in that the high voltage pulse frequency of the pulsed high voltage generator with it is low
The repetition rate of energy impulse positron beam group is consistent.
3. acceleration system as described in claim 1, which is characterized in that further include: pulse positron source component is low for emitting
Energy impulse positron beam group.
4. acceleration system as claimed in claim 3, which is characterized in that the pulse positron source component is arranged in the high pressure
In isolated vacuum chamber or in sealing vacuum system, the sealing vacuum system is connect with the high_voltage isolation vacuum chamber.
5. acceleration system as claimed in claim 3, which is characterized in that further include: synchronous generator, the synchronization signal
Generator provides waveform signal to the pulse positron source component, and waveform signal delay scheduled delay tm is made
For the first trigger signal provided to the pulsed high voltage generator.
6. acceleration system as claimed in claim 5, which is characterized in that
The length L of the high pressure accelerating cavity is greater than shortest length Lmin, the shortest length LminAccelerated by being applied to the high pressure
The high pressure of chamber reaches the rise time tr of peak value and the initial velocity of low energy pulse positron beam group determines；
The pulse positron source component is equal to the focusing of low energy pulse positron beam group with the high pressure accelerating cavity distance S1
The difference of distance and the length L of the high pressure accelerating cavity；
The high pressure applied to the high pressure accelerating cavity emits next low energy pulse positron beam in the pulse positron source component
Ground potential is dropped to before group；
The scheduled delay tm is determined by the primary power that the distance S1 and low energy pulse positron beam are rolled into a ball.
7. acceleration system as described in claim 1, which is characterized in that the low energy pulse positron beam group is Low-energy Positron
Beam group, the pulsed high voltage generator are pulse positive high voltage power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610330579.7A CN105934065B (en) | 2016-05-18 | 2016-05-18 | Acceleration system for low energy pulse positron beam group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610330579.7A CN105934065B (en) | 2016-05-18 | 2016-05-18 | Acceleration system for low energy pulse positron beam group |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105934065A CN105934065A (en) | 2016-09-07 |
| CN105934065B true CN105934065B (en) | 2018-12-11 |
Family
ID=56841710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610330579.7A Active CN105934065B (en) | 2016-05-18 | 2016-05-18 | Acceleration system for low energy pulse positron beam group |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105934065B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2822244C1 (en) * | 2023-12-11 | 2024-07-03 | Федеральное государственное бюджетное учреждение науки Институт ядерных исследований Российской академии наук (ИЯИ РАН) | Charged particle accelerator |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109121279A (en) * | 2018-08-30 | 2019-01-01 | 广州昭合环保科技有限公司 | A kind of charged particle accelerator |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1242869A (en) * | 1997-01-02 | 2000-01-26 | 应用先进技术公司 | Electron beam accelerator |
| CN2788347Y (en) * | 2005-04-22 | 2006-06-14 | 北京中科信电子装备有限公司 | Static ion accelerating tube against X ray |
| JP4390815B2 (en) * | 2007-03-19 | 2009-12-24 | 株式会社半導体理工学研究センター | Slow positron beam generator |
| CN203314981U (en) * | 2013-05-15 | 2013-12-04 | 北京大基康明医疗设备有限公司 | Union operation system uniting radiotherapy and imaging diagnosis |
| CN104867529B (en) * | 2015-05-12 | 2017-08-29 | 南华大学 | A kind of medical-isotope production method and device based on laser wakefield accelerator |
-
2016
- 2016-05-18 CN CN201610330579.7A patent/CN105934065B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2822244C1 (en) * | 2023-12-11 | 2024-07-03 | Федеральное государственное бюджетное учреждение науки Институт ядерных исследований Российской академии наук (ИЯИ РАН) | Charged particle accelerator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105934065A (en) | 2016-09-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Bernard et al. | Scientific status of plasma focus research | |
| JP2009545112A (en) | Generation method of high energy particle pulse bundle and particle supply device for its operation | |
| Pak et al. | Breakdown characteristics in nonplanar geometries and hollow cathode pseudospark switches | |
| US7579578B2 (en) | Advanced multipurpose pseudospark switch having a hollow cathode with a planar spiral electrode and an aperture | |
| Pitchford | Electron‐beam generation during the hollow cathode phase of pseudospark discharges | |
| Zhang et al. | Characteristics of pseudospark discharge in particle-in-cell simulations | |
| CN105934065B (en) | Acceleration system for low energy pulse positron beam group | |
| Tarasenko et al. | On the mechanism of subnanosecond electron beam formation in gas-filled diodes | |
| Yang et al. | Time evolution of the two-dimensional expansion velocity distributions of the cathode plasma in pulsed high-power diodes | |
| Bratchikov et al. | X-ray radiation from the volume discharge in atmospheric-pressure air | |
| Kovalchuk et al. | Electron-beam accelerator for pumping of a Xe2 lamp | |
| Pal | Particle-in-cell simulation study of PCE-gun for different hollow cathode aperture sizes | |
| Birrell et al. | New developments in paraxial radiographic diode technology for focusing intense relativistic electron beams | |
| Queller et al. | High-current carbon-epoxy capillary cathode | |
| Meng et al. | The influence of the cathode radius on the microgap breakdown in air based on PIC/MCC simulation | |
| Gribkov et al. | New efficient low-energy dense plasma focus in IPPLM | |
| Wen et al. | Numerical investigation of runaway electrons during the breakdown of homogeneous electric field air gaps under nanosecond pulse voltage | |
| Baksht et al. | Excess electron energy in vacuum diodes | |
| Tarasenko et al. | New features of the generation of runaway electrons in nanosecond discharges in different gases | |
| Ivanov | Dynamics of Formation of the Pulsed Electrical Breakdown of Highly Overvoltaged Gas Gaps in the Subnanosecond Range. | |
| Krasik et al. | Energetic electron and ion beam generation in plasma opening switches | |
| Nakagawa | A study of the properties of a magnetically-insulated ion diode | |
| Bokhan et al. | Nanosecond pulse discharge in helium | |
| Bokhan et al. | Switching of 100-kV pulses in a planar “open” discharge with generation of counterpropagating electron beams | |
| Goncharov | Production and control of high current ion beams in plasma-optical systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |