CN106409635B - A kind of short magnetic focusing arrangement and method for ultrafast electronic impulse transverse compression - Google Patents
A kind of short magnetic focusing arrangement and method for ultrafast electronic impulse transverse compression Download PDFInfo
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- CN106409635B CN106409635B CN201610910739.5A CN201610910739A CN106409635B CN 106409635 B CN106409635 B CN 106409635B CN 201610910739 A CN201610910739 A CN 201610910739A CN 106409635 B CN106409635 B CN 106409635B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/86—Vessels; Containers; Vacuum locks
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Abstract
The invention belongs to ultrafast diagnostic techniques field, is related to a kind of short magnetic focusing arrangement and method for ultrafast electronic impulse transverse compression.The short magnetic focusing arrangement includes the bobbin of tubulose and the inner magnetic screen shell of tubulose being coaxially disposed；Also include two external magnetism shielding shells, the axial direction of the first external magnetism shielding shell and the second external magnetism shielding shell along bobbin is fastened on the outside of inner magnetic screen shell；The central coaxial of first external magnetism shielding shell is provided with the first pole shoe stretched into bobbin, and the central coaxial of the second external magnetism shielding shell is provided with the second pole shoe stretched into bobbin, magnetic gap is formed between the first pole shoe and the second pole shoe；Magnetic gap adjusting means is installed at the fastening of external magnetism shielding shell；Same axis adjustment device is provided with the outer face of external magnetism shielding shell, cooling system is provided between inner face and corresponding baffle plate.The present invention has effectively cooling coil and alignment is fine-tuning and pole shoe gap can accurate adjustment the advantages of, can especially realize that long-time stable works.
Description
Technical field
The invention belongs to ultrafast diagnostic techniques field, is related to a kind of short magnetic focusing for ultrafast electronic impulse transverse compression
Device and method.
Background technology
The mankind are increasingly deep into microcosmos to the understanding of nature.The most essential process of reflection material world presentation is all sent out
Life, can in psec, femtosecond even Ah's second-time (being referred to as ultrafast process) in molecule or atomic interior, its corresponding time scale
Call " fast changing ".These ultrafast processes are understood in depth, need not be come by the diagnostic tool with superelevation time-space resolution
Make up the deficiency of human eye resolution capability (1/24 Miao ＆0.1 millimeters).Ultrafast electric diffraction (UED), ultrafast electron crystallography (UEC),
The ultrafast diagnostic techniques such as ultrafast electron microscope (UEM) and streak camera (Streak Camera) is with its psec or even sub- femtosecond
The ultrahigh time resolution of magnitude is widely used in the ultrafast mistake such as structural phase transition in material science, physics, chemistry and biology
The detection study of journey, help people to understand the process of these Fast Phenomenas change with this, greatly increase the mankind for objective generation
The depth of boundary's understanding, improve the ability of mankind's nature remodeling.The key of these ultrafast diagnostic techniques is how to obtain high electric charge
The electron source of density (high brightness), the high quality of high time-space resolution, it determines our detection accuracies to microcosmos.
Ultrafast electronic impulse, as the set of a charged particle, communication process is severely limited by space charge effect (electricity
Coulomb repulsion between son-electronics), the track of its beam spot shape, size and each electronics may be all changed, and often result in electronics
The transverse direction (spatial discrimination) and longitudinal direction (time resolution) broadening of pulse.However, set for high-spatial and temporal resolution detection, ultrafast diagnosis
For standby, the size of electronic impulse beam spot directly determines the spatial resolving power of the system to a certain extent, and it has to small
The detection study that enough spatial resolutions carry out ultrafast process could be provided in 500 μm or so.With reference to Siwick et al. text
Offer, energy 30keV, pulse number of electrons 104, initial pulsewidth 50fs (1fs=10-15S) electronic impulse only propagates 4ns (i.e.
40cm is propagated in energy 30keV electronic impulse) just broadening to 6.5ps (1ps=10-12s).Meanwhile with reference to Robinson etc.
The document of people, on the premise of negative and positive die opening 15mm, accelerating potential 45kV, the electronic impulse of initial 200 μm of beam size is not
After 40cm is propagated in line focus compression, natural broadening to~1.1mm, and introduce after the magnetic field that intensity is 37.8mT focuses on, electron beam
Spot is contracted to~100 μm, and spatial resolving power is obviously improved.
As can be seen here, in ultrafast diagnostic techniques, the focusing arrangement for introducing high stability carries out the horizontal pressure of electronic impulse
Contracting, suppress electron beam space charge effect, reduce because space charge effect presence and to the influence of electron beam divergence degree, keep away
Exempt from it to spread apart along three dimensions in flight course, on the premise of time resolution is met, farthest compress beam spot
Size is most important.Currently used Electron Beam Focusing means can be divided into：Electrostatic focusing and magnetic focusing.
Document Shakya M M, Chang Z.An accumulative x-ray streak camera with 280-
fs resolution[J].Proceedings of SPIE-The International Society for Optical
Engineering,2004,5534:125-131. is related to a kind of electric quadrupole lens and makees focusing arrangement, and it is by four cylindrical electrode institutes
Composition, and has two planes of symmetry, is continued through using interelectrode potential official post electron beam after a series of equipotential surfaces at one
The plane of symmetry is focused, and another plane of symmetry is defocused, and the total convergence characteristics of lens are surplus after two kinds of opposite characteristics cancel each other
It is remaining, i.e., a kind of " difference " result.Though the electrostatic focusing arrangement has the less advantage of spherical aberration, larger distortion is still suffered from
, the image for causing to obtain is widened, and because acceleration of the different electronics in electrostatic focusing lens is uneven with slowing down so that
A certain degree of broadening occurs after pulse outgoing, energy dispersion is big, and space charge effect is notable, to high-energy photoelectron focusing power
It is weaker, and photoelectron can be caused to slow down, electron-optical system is longer.All these unfavorable factors cause electron transit time
Disperse increases, and is unfavorable for the raising of system spatial and temporal resolution.
Compared to electrostatic focusing, magnetic focusing has the following advantages that：1. it is simple in construction, can be with by the exciting current for changing coil
Continuously adjusting for focal length and multiplication factor is realized, the charge pattern zoomed in or out can be obtained using short magnetic focusing；And in electrostatic
, it is necessary to which applying very high voltage can be only achieved this effect in focusing.2. magnetic focusing exciting current is generally between 0~2A, corresponding
Voltage<100V, no breakdown sparking problem；And ten thousand volts of high pressure is generally added on the electrode of electrostatic lenses, easily cause electricity
Frequent sparking between pole.3. the aberration of magnetic lenses is smaller.4. under magnetic fields, the running orbit of electronic impulse changes
And energy is constant, i.e. magnetic lenses will not directly cause pulse longitudinal direction broadening.Therefore in ultrafast diagnostic device, typically gathered using short magnetic
Coke installation.
For currently used magnetic focusing arrangement, the fuel factor of coil is a big problem, and it seriously governs system
Working time and job stability.Heating causes 0.01A current fluctuation electron beam will be made to deflect.In long-time work
When making, the fluctuation of electric current causes magnetic coil to generate heat, and causes the increase of copper conductor resistance, and resistance increase aggravates fever phenomenon in turn
Deteriorate focus current, go round and begin again, ultimately cause the position skew of beam spot.Magnetic focusing system is normally at outside vacuum cavity
Side, the quality of itself and the alignment of cavity also drastically influence the stability of beam spot.If cooling and alignment are bad, must
Caused beam spot is shaken, so as to cause resolution characteristic to decline, greatly influences the time-space resolution ability of electronic impulse, very
Lead to not the detection for carrying out ultrafast phenomena in big degree, grasped so effective means must be used to be focused the cooling of device
Make and alignment accurate adjustment.Meanwhile focusing arrangement is placed on a fixed position by the substantial amounts of ultrafast diagnostic device of document report
On, or very close to anode, be used only to obtain best focusing electron beam at detector.Come from whole experimentation
Consider, this is often possible to not be optimal focal position.Critically regulation magnetic gap is the equal of regulation magnetic fields scope, is finely tuned
Focus characteristics, whole system is set to be in optimal state.
CN1851843A and CN1851450A discloses the device that a kind of ultrashort electron pulses are produced and controlled, magnetic therein
Coil can not effectively be cooled down as important compression member and coaxially finely tuned, and govern the long-time stable work of system.
Document Robinson M S, Lane P D, Wann D A.A compact electron gun for time-
resolved electron diffraction[J].Review of Scientific Instruments,2015,86(1):
A magnetic focusing arrangement is devised in 013109., mainly by line bag, magnetic screen shell composition, by xyz displacement platforms come fine adjustment
The coaxial deviation of the system caused by coiling is uneven, ensure that electronic impulse passes through from lens centre.Connected using copper braid over braid
Connect the cooling that liquid nitrogen container carries out magnetic lenses.Although the device can accurately adjust alignment and equilibrium temperature, this side
The cost too expensive of case, cost is high, and cost performance is too poor.
Can not effectively it be cooled down as can be seen that the device and method of existing ultrafast electronic impulse transverse compression is present, its is serious
Influence job stability and time, coaxial fine setting and the accurate adjustment of pole shoe gap or it is with high costs the shortcomings of, be badly in need of a kind of new
The device and method of the pulse transverse compression of high stability.
The content of the invention
In order to solve, existing pulse transverse compression device cooling effect is poor, alignment regulation is difficult, manufacturing cost is high
Technical problem, the present invention provide a kind of short magnetic focusing arrangement for ultrafast electronic impulse transverse compression.
The present invention technical solution be：A kind of short magnetic focusing arrangement for ultrafast electronic impulse transverse compression, its
It is characterized in that：
Including the bobbin of tubulose and the inner magnetic screen shell of tubulose being coaxially disposed；Respectively set on two end faces of the bobbin
There is a circular baffle plate, the interior circular diameter of baffle plate is equal to the diameter of bobbin, and the outside diameter of baffle plate is equal to inner magnetic screen shell
Diameter；Inner magnetic screen shell, bobbin and two baffle plates surround toroidal cavity jointly, and the coil being wound on bobbin is provided with cavity；
Also include two external magnetism shielding shells, the first external magnetism shielding shell and the second external magnetism shielding shell are fastened on along the axial direction of bobbin
The outside of inner magnetic screen shell；The central coaxial of first external magnetism shielding shell is provided with the first pole shoe stretched into bobbin, the second outer magnetic
The central coaxial of shielding case is provided with the second pole shoe stretched into bobbin, and magnetic gap is formed between the first pole shoe and the second pole shoe；
Magnetic gap adjusting means is installed at the fastening of the first external magnetism shielding shell and the second external magnetism shielding shell；
Same axis adjustment device is provided with the outer face of the first external magnetism shielding shell and the second external magnetism shielding shell；
Cooling is provided between the inner face of the first external magnetism shielding shell and the second external magnetism shielding shell and corresponding baffle plate
System.
Be provided with the first same axis adjustment device on the outer face of above-mentioned first external magnetism shielding shell, the second external magnetism shielding shell it is outer
The second same axis adjustment device is provided with end face；The same axis adjustment device includes multiple rotary screws being disposed radially.
Toroidal cavity is formed between the inner face of above-mentioned first external magnetism shielding shell and corresponding baffle plate, is provided with cavity
One cooling chamber and the second cooling chamber；Cooling entrance is provided with first cooling chamber, coolant outlet is provided with the second cooling chamber；
Toroidal cavity is formed between the inner face of the second external magnetism shielding shell and corresponding baffle plate, is provided with cavity
Three cooling chambers；3rd cooling chamber is connected with the first cooling chamber and the second cooling chamber respectively by cooling duct.
Above-mentioned cooling duct is arranged on inside bobbin.
Above-mentioned cooling entrance is located at the first cooling chamber bottom, and the coolant outlet is located at the second cooling chamber bottom, described cold
But passage is located at the top of the first cooling chamber and the second cooling chamber.
The axial length of above-mentioned first pole shoe is more than the axial length of the second pole shoe.
The distance between first external magnetism shielding shell and the second external magnetism shielding shell are equal between the first pole shoe and the second pole shoe
Distance.
The distance between above-mentioned first pole shoe and the second pole shoe are adjusted in 0-39mm.
Above-mentioned bobbin is made up of non-magnetic material；The inner magnetic screen shell, the first external magnetism shielding shell and the second external magnetism shielding shell
It is made by high-permeability material.
The present invention also provides a kind of short magnetic focusing method for ultrafast electronic impulse transverse compression, and its special character exists
In：Comprise the following steps：
Short magnetic focusing arrangement for ultrafast electronic impulse transverse compression is set in the vacuum cavity of ultrafast electron motion
Outside, then carry out alignment regulation, magnetic gap regulation and temperature control；
Alignment is adjusted：First is turned respectively with axis adjustment device and second with the rotary screw on axis adjustment device, is adjusted
Relative position between the whole short magnetic focusing arrangement and vacuum cavity, keep coaxial；
Magnetic gap is adjusted：Keep the second external magnetism shielding shell position to fix, move axially the first external magnetism shielding shell, change the second pole
The distance between boots and the first pole shoe, magnetic gap size is judged according to the graduated scale in magnetic gap adjusting means；
Temperature control：Coolant or cooling gas, coolant or cooling gas filling first are passed through by cooling entrance
After cooling chamber, flowed into by the cooling duct at the top of the first cooling chamber and fill the 3rd cooling chamber, then by another cooling duct
The second cooling chamber is flowed into, is then exported from coolant outlet；Enter trip temperature by adjusting the flow velocity of coolant or cooling gas
Control.
The beneficial effects of the present invention are：
(1) present invention has effectively cooling coil and alignment is fine-tuning and pole shoe gap can accurate adjustment the advantages of, especially
Long-time stable work can be achieved.
(2) present invention can use air-cooled or water cooling to carry out effective temperature-reducing, solve existing focusing by designing cooling system
The cooling heat dissipation problem that system works long hours, raising system cause current fluctuation caused by elevating the temperature due to coil Joule heat
Job stability.
(3) present invention is provided with coaxial fine tuning structure, can coaxially be adjusted using rotary screw, solves existing focus on and fills
Put the coaxial sex chromosome mosaicism caused by device fabrication and coiling uniformity.
(4) present invention can continuously adjust magnetic fields region, change magnetic by setting telescopic pole shoe with a scale
Field action center, solve the problems, such as existing system pole shoe gap can not accurate adjustment, actual compression effect is preferably adjusted to mould
The performance indications of timing are proposed, improve the time-space resolution of system.
Brief description of the drawings
Fig. 1 is the short magnetic focusing arrangement diagrammatic cross-section of present pre-ferred embodiments.
Fig. 2 is the short magnetic focusing arrangement disassembled form schematic diagram of present pre-ferred embodiments.
Fig. 3 is the cooling system cross section view of present pre-ferred embodiments.
Fig. 4 is the left view (perspective view) of cooling system in Fig. 3.
Fig. 5 is the right view of cooling system in Fig. 3.
Fig. 6 is the short magnetic focusing arrangement corresponding Magnetic Induction Density Distribution figure under different magnetic gap width conditions of the present invention.
Fig. 7 is the magnetic induction intensity of the short magnetic focusing arrangement of the present invention with the changing trend diagram of magnetic gap width.
Fig. 8 is the angle of pitch instruction figure of the short magnetic focusing arrangement of the present invention.
Fig. 9 is Magnetic Induction Density Distribution figure of the short magnetic focusing arrangement of the present invention under the different angles of pitch on the corresponding longitudinal axis.
Embodiment
The present invention provides one kind and can cooled down, while the short magnetic focusing dress that magnetic gap width and alignment can be adjusted
Put, by adjusting magnetic gap width, exciting current and alignment, realize the transverse focusing of ultrafast electronic impulse.
Referring to Fig. 1 and Fig. 2, the structures of present pre-ferred embodiments includes magnetic in the tubulose bobbin 1 and tubulose that are coaxially disposed
Shielding case 2；A circular baffle plate 3 is each provided with two end faces of bobbin 1, the interior circular diameter of baffle plate is equal to the straight of bobbin
Footpath, the outside diameter of baffle plate are equal to the diameter of inner magnetic screen shell；Inner magnetic screen shell 2, bobbin 1 and two baffle plates 3 surround ring jointly
Shape cavity, the coil 4 being wound on bobbin is provided with cavity；
The short magnetic focusing arrangement also includes two external magnetism shielding shells, the first external magnetism shielding shell 5 and the edge of the second external magnetism shielding shell 6
The axial direction of bobbin 1 is fastened on the outside of inner magnetic screen shell 2.Inner magnetic screen shell 2 suppresses the leakage in magnetic field in bobbin 1 is enclosed in.
First external magnetism shielding shell 5 and the second external magnetism shielding shell 6 are further by magnetically confined in it.Two external magnetism shielding shells are asymmetrical
Structure, the axial length of the first external magnetism shielding shell 5 are more than the length of the second external magnetism shielding shell 6.
The central coaxial of first external magnetism shielding shell 5 is provided with the first pole shoe 7 stretched into bobbin, the second external magnetism shielding shell 6
Central coaxial be provided with the second pole shoe 8 stretched into bobbin, form magnetic gap between the first pole shoe 7 and the second pole shoe 8；Outside first
The distance between external magnetism shielding shell 6 of magnetic screen shell 5 and second is equal to the distance between the first pole shoe 7 and the second pole shoe 8, therefore logical
Crossing the distance read between two external magnetism shielding shells can be to directly obtain magnetic gap size.Magnetic gap is accurate adjustable in 0~39mm, this
Sample can enable magnetic field to concentrate in this 0~39mm gap, reduce the cross direction profiles width in magnetic field while increase
Field strength.During use by short magnetic focusing arrangement is applied different exciting current can be produced at 0~39mm magnetic gaps it is non-
Uniform magnetic field so that ultrafast electronic impulse is focused on different positions with different beam spot sizes.With external magnetism shielding shell phase pair
Answer, two pole shoes are also asymmetrical structure, i.e., the length of the first pole shoe 7 is more than the length of the second pole shoe 8.Initial magnetic gap institute
Be located proximate to one end of short magnetic focusing arrangement rather than positioned at center, so set the advantages of be it is some need electronics drift away from
From it is smaller when just complete focusing in the case of, initial magnetic gap position closer to edge can with it is more early complete focus on because short magnetic
Focusing arrangement also occupies certain axial length in itself.
Magnetic gap adjusting means is installed at the fastening of first external magnetism shielding shell 5 and the second external magnetism shielding shell 6；Magnetic gap regulation dress
Put including the finely divided scale for weighing distance between the first pole shoe and the second pole shoe；Can be smart vertically by the graduated scale
The running fix of true ground, and then accurate regulation magnetic gap size.
First is provided with the outer face of first external magnetism shielding shell 5 with axis adjustment device 10, the second external magnetism shielding shell 6 it is outer
Second is provided with end face with axis adjustment device 11；It is made up of with axis adjustment device multiple rotary screws being disposed radially；It is logical
Cross and slowly turn screw to finely tune short magnetic focusing arrangement and the alignment on the outside of vacuum cavity, while screw can also be fixed and mixed up
State afterwards.
Bobbin can use stainless steel (316L either 304L), brass or other non-magnetic materials；What focus coil used
Material can be 0.5-1mm copper conductor；Inside and outside magnetic screen shell (and pole shoe) is using the soft iron material with high magnetic permeability
Expect (μ>200), such as pure iron, ferrocobalt or Ⅴ-permandur alloy, its main function are exactly in narrow magnetic by magnetically confined
At gap, increase maximum axial magnetic field, and prevent leakage magnetic field, the position that pole shoe as really focuses on；In whole inner magnetic screen
There is the permalloy that a layer thickness is 1-2mm outside shell, for further preventing leakage magnetic field.
Referring to Fig. 3 to Fig. 5, toroidal cavity is formed between the inner face of the first external magnetism shielding shell 5 and corresponding baffle plate 3, it is empty
Intracavitary is provided with the first cooling chamber 12 and the second cooling chamber 13；Cooling entrance 15, the second cooling are provided with first cooling chamber 12
Coolant outlet 16 is provided with room；
Toroidal cavity is formed between the inner face of second external magnetism shielding shell 6 and corresponding baffle plate 3, the 3rd is provided with cavity
Cooling chamber 14；3rd cooling chamber 14 is connected with the first cooling chamber 12 and the second cooling chamber 13 respectively by cooling duct 17.
Cooling duct 17 can be arranged on inside bobbin 1.The number of cooling duct is preferred with two, and one of them is with first
Cooling chamber 12 is connected, and another is connected with the second cooling chamber 13.Cooling entrance 15 is located at the bottom of the first cooling chamber 12, cools down out
Mouth 16 is located at the bottom of the second cooling chamber 13, and cooling duct 17 is located at the top of the first cooling chamber 12 and the second cooling chamber 13.Pass through
Connecting coolant or cooling gas can cool down to short magnetic focusing arrangement.
, can be in bobbin in order to accurately install external magnetism shielding shell and be accurately positioned the position of cooling entrance, coolant outlet
The positioning hole 9 of front and rear insertion is set between two cooling ducts at top.
It is specific as follows that short magnetically focused method is carried out using short magnetic focusing arrangement provided by the invention：
The short magnetic focusing arrangement in the present invention is set on the outside of the vacuum cavity of ultrafast electron motion, then carried out first
Alignment regulation, magnetic gap regulation and temperature control；
Alignment is adjusted：First is turned respectively with axis adjustment device 10 and second with the rotation spiral shell on axis adjustment device 11
Nail, the relative position between short magnetic focusing arrangement and vacuum cavity is adjusted, keep coaxial；
Magnetic gap is adjusted：Keep the position of the second external magnetism shielding shell 6 to fix, move axially the first external magnetism shielding shell 5, change second
The distance between pole shoe 7 of pole shoe 8 and first, judges magnetic gap size according to the graduated scale in magnetic gap adjusting means；
Temperature control：Coolant or cooling gas are passed through by cooling entrance 15, coolant or cooling gas filling the
After one cooling chamber 12, flowed into by the cooling duct 17 at the top of the first cooling chamber and fill the 3rd cooling chamber 14, then by others
Cooling duct 17 flows into the second cooling chamber 13, is then exported from coolant outlet 16；By adjusting coolant or cooling gas
Flow velocity carries out temperature control.After cooling circulation, two sides of bobbin and upper surface can form cooling surface,
So as to heat caused by guiding coil in time, the effect of stable focusing device temperature is played.This circulation is most rational circulation road
Footpath, no matter how focusing arrangement adjusts effectively is cooled down in which can always keep maximum film-cooled heat.
Fig. 6 and Fig. 7 is variation tendency of the corresponding magnetic induction intensity with it with magnetic gap width under different magnetic gap width.Add
Magnetic screen shell is more concentrated with magnetic field during pole shoe, and peak value is stronger, and magnetic gap width is smaller, and magnetic field is more concentrated, and peak value is bigger.For
An equal amount of magnetic field, the short magnetic focusing arrangement with pole shoe only need less electric current, help to reduce coil heating.
Fig. 9 is the Magnetic Induction Density Distribution on the corresponding longitudinal axis (perpendicular to axial direction, i.e. y-axis) under the different angles of pitch
(angle of pitch is as shown in Figure 8).Magnetic field is moved with the increase of the anglec of rotation to y-axis negative direction, i.e., magnetic lenses pitching is for super
The focusing of fast electronic impulse has a great impact, thus the alignment of the coupled vacuum pipe of short magnetic focusing arrangement is to ensure
Electronic impulse has the key factor of preferable focus characteristics.
Claims (10)
- A kind of 1. short magnetic focusing arrangement for ultrafast electronic impulse transverse compression, it is characterised in that：Including the bobbin of tubulose and the inner magnetic screen shell of tubulose being coaxially disposed；One is each provided with two end faces of the bobbin Individual circular baffle plate, the interior circular diameter of baffle plate are equal to the diameter of bobbin, and the outside diameter of baffle plate is equal to the straight of inner magnetic screen shell Footpath；Inner magnetic screen shell, bobbin and two baffle plates surround toroidal cavity jointly, and the coil being wound on bobbin is provided with cavity；Also include two external magnetism shielding shells, the axial direction of the first external magnetism shielding shell and the second external magnetism shielding shell along bobbin is fastened on interior magnetic The outside of shielding case；The central coaxial of first external magnetism shielding shell is provided with the first pole shoe stretched into bobbin, the second external magnetism shielding The central coaxial of shell is provided with the second pole shoe stretched into bobbin, and magnetic gap is formed between the first pole shoe and the second pole shoe；Magnetic gap adjusting means is installed at the fastening of the first external magnetism shielding shell and the second external magnetism shielding shell；Same axis adjustment device is provided with the outer face of the first external magnetism shielding shell and the second external magnetism shielding shell；Cooling system is provided between the inner face of the first external magnetism shielding shell and the second external magnetism shielding shell and corresponding baffle plate.
- 2. the short magnetic focusing arrangement according to claim 1 for ultrafast electronic impulse transverse compression, it is characterised in that：Institute State and the first same axis adjustment device is provided with the outer face of the first external magnetism shielding shell, set on the outer face of the second external magnetism shielding shell There is the second same axis adjustment device；The same axis adjustment device includes multiple rotary screws being disposed radially.
- 3. the short magnetic focusing arrangement according to claim 2 for ultrafast electronic impulse transverse compression, it is characterised in that：Institute State and toroidal cavity formed between the inner face of the first external magnetism shielding shell and corresponding baffle plate, be provided with cavity the first cooling chamber and Second cooling chamber；Cooling entrance is provided with first cooling chamber, coolant outlet is provided with the second cooling chamber；Toroidal cavity is formed between the inner face of the second external magnetism shielding shell and corresponding baffle plate, it is cold to be provided with the 3rd in cavity But room；3rd cooling chamber is connected with the first cooling chamber and the second cooling chamber respectively by cooling duct.
- 4. the short magnetic focusing arrangement according to claim 3 for ultrafast electronic impulse transverse compression, it is characterised in that：Institute Cooling duct is stated to be arranged on inside bobbin.
- 5. the short magnetic focusing arrangement according to claim 4 for ultrafast electronic impulse transverse compression, it is characterised in that：Institute State cooling entrance and be located at the first cooling chamber bottom, the coolant outlet is located at the second cooling chamber bottom, and the cooling duct is located at At the top of first cooling chamber and the second cooling chamber.
- 6. according to any described short magnetic focusing arrangement for ultrafast electronic impulse transverse compression in claim 1-5, it is special Sign is：The axial length of first pole shoe is more than the axial length of the second pole shoe.
- 7. the short magnetic focusing arrangement according to claim 6 for ultrafast electronic impulse transverse compression, it is characterised in that：The The distance between one external magnetism shielding shell and the second external magnetism shielding shell are equal to the distance between the first pole shoe and the second pole shoe.
- 8. the short magnetic focusing arrangement according to claim 7 for ultrafast electronic impulse transverse compression, it is characterised in that：Institute The distance between the first pole shoe and the second pole shoe is stated to adjust in 0-39mm.
- 9. the short magnetic focusing arrangement according to claim 8 for ultrafast electronic impulse transverse compression, it is characterised in that：Institute Bobbin is stated to be made up of non-magnetic material；The inner magnetic screen shell, the first external magnetism shielding shell and the second external magnetism shielding shell are by high magnetic conductance Rate material is made.
- A kind of 10. short magnetic focusing method for ultrafast electronic impulse transverse compression, it is characterised in that：Comprise the following steps：Short magnetic focusing arrangement for ultrafast electronic impulse transverse compression is set on the outside of the vacuum cavity of ultrafast electron motion, Then alignment regulation, magnetic gap regulation and temperature control are carried out；Alignment is adjusted：First is turned respectively with axis adjustment device and second with the rotary screw on axis adjustment device, adjusts institute The relative position between short magnetic focusing arrangement and vacuum cavity is stated, keeps coaxial；Magnetic gap is adjusted：Keep the second external magnetism shielding shell position to fix, move axially the first external magnetism shielding shell, change the second pole shoe with The distance between first pole shoe, magnetic gap size is judged according to the graduated scale in magnetic gap adjusting means；Temperature control：Coolant or cooling gas, coolant or the cooling of cooling gas filling first are passed through by cooling entrance Behind room, flowed into by the cooling duct at the top of the first cooling chamber and fill the 3rd cooling chamber, then flowed into by another cooling duct Second cooling chamber, then exported from coolant outlet；Temperature control is carried out by adjusting the flow velocity of coolant or cooling gas.
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| CN112563098B (en) * | 2021-01-10 | 2023-06-09 | 赣南师范大学 | Direct current photocathode ultrafast electron gun with immersed electrostatic lens |
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| CN101435785A (en) * | 2008-12-20 | 2009-05-20 | 中国科学院西安光学精密机械研究所 | Multi-purpose ultrafast electric diffraction apparatus |
| CN102936717A (en) * | 2012-11-08 | 2013-02-20 | 温州职业技术学院 | Compact and efficient cold cathode arc source of quasi diffusion arc |
| CN206194687U (en) * | 2016-10-19 | 2017-05-24 | 中国科学院西安光学精密机械研究所 | Moreover,the steam generator is simple in structure, |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101435785A (en) * | 2008-12-20 | 2009-05-20 | 中国科学院西安光学精密机械研究所 | Multi-purpose ultrafast electric diffraction apparatus |
| CN102936717A (en) * | 2012-11-08 | 2013-02-20 | 温州职业技术学院 | Compact and efficient cold cathode arc source of quasi diffusion arc |
| CN206194687U (en) * | 2016-10-19 | 2017-05-24 | 中国科学院西安光学精密机械研究所 | Moreover,the steam generator is simple in structure, |
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