CN203134748U - Traveling wave deflector preposed short magnetic focusing femtosecond stripe image converter tube - Google Patents
Traveling wave deflector preposed short magnetic focusing femtosecond stripe image converter tube Download PDFInfo
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- CN203134748U CN203134748U CN 201220729451 CN201220729451U CN203134748U CN 203134748 U CN203134748 U CN 203134748U CN 201220729451 CN201220729451 CN 201220729451 CN 201220729451 U CN201220729451 U CN 201220729451U CN 203134748 U CN203134748 U CN 203134748U
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
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Abstract
The utility model relates to a leading short magnetic focusing femto second stripe image converter of ripples deflector, including cathode disc, photocathode, positive pole, ripples deflector, short magnetic focusing lens, fluorescent screen that set gradually along electron propagation direction in tube and the tube, photocathode sets up on the cathode disc, and the ripples deflector includes a pair of snakelike area of being parallel to each other of placing from top to bottom, and short magnetic focusing lens includes magnetic pole boots, wraps up circular telegram solenoid in the magnetic pole boots, is close to the magnetic pole boots slit of short magnetic focusing lens entrance. The utility model discloses the overall structure of stripe image converter pipe helps improving time resolution, spatial resolution and the dynamic range of phase-change pipe, can reduce the degree of difficulty in the magnetic lens design simultaneously, does the axial length who shortens the system under the prerequisite that keeps the focusing effect, provides the possibility for the miniaturization of stripe image converter pipe.
Description
Technical field
The utility model relates to a kind of ultrafast diagnostic techniques equipment, relates in particular to femtosecond striped image converter tube.
Background technology
The striped image converter tube is a kind of ultrafast diagnostic device of realizing opto-electronic conversion, focal imaging, scan deflection and figure image intensifying and the processing of ultrafast transient state light signal.(the theoretical limit temporal resolution is up to 10fs, 1fs=10 because its writing speed is exceedingly fast
-15S), add it have light is strengthened and from infrared to different-waveband acquisition of signal abilities such as ultraviolet, X ray, nowadays it has become 10
-8～10
-13The main means in the fast time resolution diagnosis research of s wide-ultra field.Its Specifeca tion speeification is temporal resolution, spatial resolution and dynamic range etc.Come from the diversity of application and the difference of demand emphasis, present striped image converter tube also presents each performance brightly and stresses the type development trend.As, at the many ultrafast diagnostic procedure research of energy relaxation, femtosecond time frame Chemical Kinetics and the femtosecond laser diagnosis etc. of quanta trap semiconductor, then require striped image converter tube time resolution performance will reach the femtosecond magnitude.In addition, because the light signal of relevant transient process has suitable Strength Changes scope usually, the design that this will changes persuing image tube system also will take into account this index of dynamic range simultaneously.
Aspect the optimization of striped image converter tube temporal resolution, carried out number of research projects in the world.Except system all adopts capable ripple deflector as this common ground of electron-beam deflection system, existing femtosecond striped image converter tube design can be divided into two kinds according to the difference of electron focusing system: electrostatic focusing type and magnetic focusing type.The milestone formula achievement in research relevant with first type is: people such as A.Finch were by adopting cylinder symmetric form electrostatic lens method of focusing in 1988, simultaneously also adopted capable ripple deflector as electron-beam deflection system, temporal resolution has been brought up to 300fs; Kan. university in 2005 often increases brave seminar, and to adopt the electric quadrupole lens be condenser lens, is 5 microns slit by a width is set between anode and deflector, and time resolution is increased to the 280fs(integral mode).The milestone formula achievement in research relevant with second type is: Japanese shore pine company in 1994 has realized the time resolution of 180fs by employing short magnetic lens method of focusing (magnetic lens is expert at before the ripple deflector, also i.e. more close photocathode); Chang Zenghu adopted short magnetic focusing (magnetic lens is expert at after the ripple deflector) in 1998, this weak point magnetic focusing striped image converter tube has reached 540fs in the ultraviolet band temporal resolution, is 880fs in grenz ray wave band temporal resolution.But Chang Zenghu points out, the ripple deflector of will going is placed on before the magnetic focusing lens, can shorten photoelectron from photocathode to the flight time the deflector entrance, thereby reduced the flight time disperse that is caused by the first energy dispersion of photoelectron and space charge effect, the time explanation that inhibition is caused by space charge effect, this promotes temporal resolution, spatial resolution and the dynamic range of pipe the most simultaneously.In addition, because the magnetic lens system compares electrostatic lens and has littler second order aberrations coefficient, thereby with the former as the electron focusing system can the design of reduction system under condition on year-on-year basis difficulty, this makes the magnetic lens of row ripple deflector prefix type focus on femtosecond striped image converter tube design and is adopted more.But so far, though this type of femtosecond striped image converter tube realized the hundreds of femtosecond than high time resolution, its spatial discrimination performance and dynamic range are then seldom related to.Therefore, consider from striped image converter tube performance global optimization angle, in the design of high time resolution striped image converter tube, take into account spatial discrimination simultaneously and dynamic range performance is necessary.
The utility model content
Only pay attention to the technical problem that the raising spatial resolution is low, dynamic range is little of temporal resolution for solving present femtosecond striped image converter tube, the utility model provides a kind of capable ripple deflector preposition short magnetic focusing femtosecond striped image converter tube.
Technical solution of the present utility model is:
The preposition short magnetic focusing femtosecond striped image converter tube of a kind of capable ripple deflector, its special character is:
Comprise the cathode disc, photocathode, anode, row ripple deflector, short magnetic focusing lens, the phosphor screen that set gradually along the electron-propagation direction in shell and the shell, described photocathode is arranged on the cathode disc, described capable ripple deflector comprises a pair of serpentine band that is parallel to each other of placing up and down, and described short magnetic focusing lens comprises magnetic pole piece, is wrapped in the energization solenoid in the magnetic pole piece, close magnetic pole piece slit of lacking the magnetic focusing lens porch.
The scope of the potential difference of above-mentioned photocathode and anode is-20kV～-10kV;
Described anode is set to 0 current potential;
The axial distance of described photocathode and anode is 1～3mm;
Described magnetic pole piece slit is of a size of 3～10mm;
The width of the serpentine band of described capable ripple deflector is 1～5mm;
Distance between the serpentine band of described capable ripple deflector is 1～2mm;
Described phosphor screen is positioned at the best image planes place of system.
Above-mentioned cathode disc also comprises the outer lug boss that is arranged between cathode disc and the photocathode.
The best image planes place of said system determines in the following manner: from the time pole axis with the electronics of 72.5 ° of elevations angle emissions, under the condenser lens effect with the transverse plane at system symmetry axis intersection point place.
The outer truncated cone-shaped that is shaped as of above-mentioned cathode disc; Described anode is wire-grid structure.
The entrance size of above-mentioned short magnetic focusing lens is less than the outlet size of short magnetic focusing lens.
The utlity model has following advantage:
1, the overall structure of the utility model striped image converter tube helps to improve temporal resolution, spatial resolution, and the dynamic range of image converter tube, can reduce simultaneously the difficulty in the magnetic lens design, under the prerequisite that keeps focusing effect, also can shorten the axial length of system, for the miniaturization of striped image converter tube provides possibility.
2. temporal resolution height.Higher potential difference and less axial distance between photocathode 3 and the anode 4 in the utility model make the physical time disperse in K-A district obtain good restraining; Anode 4 is set to 0 current potential simultaneously, thereby has shielded the influence of K-A district electric field to the subsequent electrode element, and this helps to reduce the deflection chromatic dispersion of system; Realized the capable ripple deflector of high deflection sensitivity, primary deflector chromatic dispersion by optimizing width between the snakelike live width of capable ripple deflector and the serpentine, improved the technology time resolution of image converter tube integral body, this makes the temporal resolution performance of system obtain very big lifting.
3. spatial resolution height.Higher potential difference and less axial distance between photocathode 3 and the anode 4 in the utility model can effectively shorten electronics in the flight time in K-A district, can suppress space charge effect to the influence of the horizontal broadening of electronic impulse; Simultaneously, the higher potential difference of K-A also can improve the speed that electronics is propagated vertically, shortens the transit time of electronics in whole system.The two can reduce the time of space charge effect effect, thus the spatial discrimination ability of elevator system.
4. the utility model also is conducive to promote the image converter tube dynamic range.The ripple deflector of will going is placed on before the magnetic focusing lens, can shorten photoelectron from photocathode to the flight time the deflector entrance, thereby significantly suppressed the influence of space charge effect paired pulses electron beam performance parameter, finally promoted the dynamic range of image converter tube system.
The entrance size of the short magnetic focusing lens 6 of 5 the utility model is less than the outlet size of short magnetic focusing lens 6, and this can shield capable ripple deflector and produce capable ripple deflection field to the influence of electronics in the magnetic focusing lens.
6 the utility model anodes 4 are wire-grid structure, and effectively shielded cathode-anode region electric field is to the influence of subsequent element.
7. the utility model cathode disc outer lug boss 2 can prevent the high voltage arc in K-A district and the distortion that negative electrode occurs when high vacuum.
Description of drawings
Fig. 1 is femtosecond striped image converter tube structural representation;
Fig. 2 is row ripple deflector structural representation;
Fig. 3 is the short magnetic lens structural representation;
Fig. 4 is temporal modulation transfer function;
Fig. 5 is the spatial modulation transfer function apart from cathode center 3.0mm place;
Wherein: 1-photocathode dish; The 2-outer lug boss; The 3-photocathode; The 4-anode; The capable ripple deflector of 5-; The short magnetic focusing lens of 6-; The 7-phosphor screen; The 8-shell; The 9-magnetic pole piece; The 10-energization solenoid; 11-magnetic pole piece slit.
Embodiment
The concrete course of work of the present utility model is: photocathode 3 is under the irradiation of extraneous transient state light signal, with the pulse of external photoelectric effect process emission photoelectron.Under the approximate situation, this process can be thought what moment finished, and the electronic impulse width is identical with incident optical signal, the proportional relation of electronic impulse strength information and incident optical signal.Anode 4, row ripple deflector 5 and short magnetic focusing lens 6 constitute complex focusing-deflection system, this photoelectron pulse concentration is formed spatial deflection scanning striped picture at the phosphor screen plane at best image planes place diverse location, realize that light signal temporal information to be measured is to the mapping of spatial information.
In the utility model specific implementation process, at first want the position of the best image planes of estimating system, also be the position at place, phosphor screen plane.Best image planes are defined as: with the electronics of 72.5 ° of elevations angle emissions, the transverse plane with system symmetry axis intersection point place under the condenser lens effect is best image planes from the time pole axis.Thereby before determining best image planes, at first want the field distribution of solving system electrostatic focusing.
Secondly, estimation provides parameters such as the temporal resolution of system and spatial resolution.This requirement provides the photoelectronic sampling of photocathode 3 emissions, and complex focusing-deflection field of obtaining system simultaneously distributes, and carries out electronic tracking based on this.From the photoelectron that photocathode emits, its primary power, azimuth, the elevation angle and initial position all satisfy certain Distribution Statistics.Photoelectronic initial position distribution can be even distribution (when evenly illumination is penetrated) or be bordering on Gaussian Profile (laser irradiation at short distance), photoelectron just energy it is generally acknowledged that obeying β distributes, after given photoelectronic energy just, first position and initial inclination distribution, can utilize the Monte-Carlo method to sample.According to the law of great number in the probability theory, have only when frequency in sampling when reaching infinitely-great, sampling distribution could be near actual distribution, and reality is difficult to accomplish that frequency in sampling reaches infinitely great, therefore whether the Monte-Carlo sampling results is reliable, must be verified.The calculating of following the tracks of electron trajectory is based on following hypothesis: (1) photoelectronic energy just satisfies in (β on 0～0.6eV) (1,4) distribution, the Monte-Carlo sampling employing direct sampling method of this distribution; (2) evenly distribution is satisfied in the first position of electronics; (3) the electronics launching elevation is obeyed the cosine distribution of (0～90 °) scope, and the even distribution in (0～2 π) scope is obeyed at the azimuth, the Monte-Carlo sampling integration sampling of cosine distribution.Available finite difference calculus of calculating of focusing-deflection field etc. is wherein often ignored the influence of electronic impulse electric charge in the system.After field distribution was determined, available quadravalence Runge-Kutta method was carried out electronic tracking, with final definite temporal resolution and spatial resolution parameter.
Embodiment: photocathode 3 current potentials are-15kV; Anode 4 is set to 0 current potential; The distance of K-A is 2mm; Row ripple deflector overall dimension is 40 * 20mm; Number of ampere turns that magnetic lens adds is 1300 ampere-turns, and electronics porch magnetic pole piece internal diameter is 7.5mm, and exit magnetic pole piece internal diameter is 15mm.According to these parameters, on the basis that photoelectron emissions Monte-Carlo sampling and electronic tracking calculate, can try to achieve: the best image planes of system are apart from photocathode 265mm, the time resolution of system's femto second scanning image converter tube as shown in Figure 4, its physical time is differentiated as can be known
τ
phys=250fs。
Aspect technology time resolution estimation, suppose: row ripple deflector 5 deflection sensitivity P=45mm/kV, dynamic space is differentiated δ=10lp/mm, scanning voltage slope k=10kV/ns, thereby sweep speed v=k * P=4.5 * 10
8M/s, and then the technology time resolution that can calculate system is
Thereby the single sweep operation temporal resolution is
(GaAs photoconductive switch operating frequency is 1000Hz) establishes scanning circuit time jitter τ under low frequency synchronous scanning mode of operation
Jitter=100fs, then its time resolution under the synchronous scanning pattern is
Femtosecond striped image converter tube slit length direction apart from the spatial modulation transfer function at cathode center 3.0mm place as shown in Figure 5.As can be known: diameter is on the circle of Φ 6 on the cathode plane, and meridian plane and sagittal surface spatial resolution reach 29lp/mm and 28lp/mm (@MTF10% respectively).
Claims (6)
1. preposition short magnetic focusing femtosecond striped image converter tube of capable ripple deflector is characterized in that:
Comprise the cathode disc (1) that sets gradually along the electron-propagation direction in shell (8) and the shell (8), photocathode (3), anode (4), row ripple deflector (5), short magnetic focusing lens (6), phosphor screen (7), described photocathode (3) is arranged on the cathode disc (1), described capable ripple deflector (5) comprises a pair of serpentine band that is parallel to each other of placing up and down, and described short magnetic focusing lens (6) comprises magnetic pole piece (9), be wrapped in the energization solenoid (10) in the magnetic pole piece (9), magnetic pole piece slit (11) near short magnetic focusing lens (6) porch.
2. the preposition short magnetic focusing femtosecond striped image converter tube of capable ripple deflector according to claim 1 is characterized in that:
The scope of the potential difference of described photocathode (3) and anode (4) is-20kV～-10kV;
Described anode (4) is set to 0 current potential;
The axial distance of described photocathode (3) and anode (4) is 1～3mm;
Described magnetic pole piece slit (11) is of a size of 3～10mm;
The width of the serpentine band of described capable ripple deflector is 1～5mm;
Distance between the serpentine band of described capable ripple deflector is 1～2mm;
Described phosphor screen (7) is positioned at the best image planes place of system.
3. the preposition short magnetic focusing femtosecond striped image converter tube of capable ripple deflector according to claim 1 and 2, it is characterized in that: described cathode disc (1) also comprises the outer lug boss (2) that is arranged between cathode disc (1) and the photocathode (3).
4. the preposition short magnetic focusing femtosecond striped image converter tube of capable ripple deflector according to claim 3, it is characterized in that: the best image planes place of described system determines in the following manner: from the time pole axis with the electronics of 72.5 ° of elevations angle emissions, under the condenser lens effect with the transverse plane at system symmetry axis intersection point place.
5. the preposition short magnetic focusing femtosecond striped image converter tube of capable ripple deflector according to claim 4 is characterized in that: the outer truncated cone-shaped that is shaped as of described cathode disc (1); Described anode (4) is wire-grid structure.
6. the preposition short magnetic focusing femtosecond striped image converter tube of capable ripple deflector according to claim 5 is characterized in that: the entrance size of described short magnetic focusing lens (6) is less than the outlet size of short magnetic focusing lens (6).
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| CN 201220729451 CN203134748U (en) | 2012-12-26 | 2012-12-26 | Traveling wave deflector preposed short magnetic focusing femtosecond stripe image converter tube |
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| CN 201220729451 CN203134748U (en) | 2012-12-26 | 2012-12-26 | Traveling wave deflector preposed short magnetic focusing femtosecond stripe image converter tube |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103035462A (en) * | 2012-12-26 | 2013-04-10 | 中国科学院西安光学精密机械研究所 | Traveling wave deflector preposed short magnetic focusing femtosecond stripe image converter tube |
| CN107706075A (en) * | 2017-11-09 | 2018-02-16 | 中国工程物理研究院激光聚变研究中心 | A kind of multizone detection scanning image converter tube |
-
2012
- 2012-12-26 CN CN 201220729451 patent/CN203134748U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103035462A (en) * | 2012-12-26 | 2013-04-10 | 中国科学院西安光学精密机械研究所 | Traveling wave deflector preposed short magnetic focusing femtosecond stripe image converter tube |
| CN107706075A (en) * | 2017-11-09 | 2018-02-16 | 中国工程物理研究院激光聚变研究中心 | A kind of multizone detection scanning image converter tube |
| CN107706075B (en) * | 2017-11-09 | 2023-09-19 | 中国工程物理研究院激光聚变研究中心 | Multi-region detection scanning image converter tube |
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Granted publication date: 20130814 |