CN106409635A - Short magnetic focusing device and method for transversal compression of ultrafast electronic pulses - Google Patents
Short magnetic focusing device and method for transversal compression of ultrafast electronic pulses Download PDFInfo
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- CN106409635A CN106409635A CN201610910739.5A CN201610910739A CN106409635A CN 106409635 A CN106409635 A CN 106409635A CN 201610910739 A CN201610910739 A CN 201610910739A CN 106409635 A CN106409635 A CN 106409635A
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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 present invention belongs to the ultrafast diagnostic technique field and relates to a short magnetic focusing device and method for the transversal compression of ultrafast electronic pulses. The short magnetic focusing device comprises a tubular linear shaft and a tubular inner magnetic shielding shell which are arranged coaxially; the short magnetic focusing device further comprises two outer magnetic shielding shells, wherein the first outer magnetic shielding shell and the second outer magnetic shielding shell are axially buckled to the outer side of the inner magnetic shielding shell along the axial direction of the linear shaft; the center of the first outer magnetic shielding shell is coaxially provided with a first pole shoe extending into the linear shaft; and the center of the second outer magnetic shield shell is coaxially provided with a second pole shoe extending into the linear shaft; a magnetic gap is formed between the first pole shoe and the second pole shoe; and a buckling position of the outer magnetic shielding shells is provided with a magnetic gap adjustment device; the outer end surfaces of the outer magnetic shielding shells are provided with coaxial adjustment devices; and cooling systems are arranged between the inner end surfaces of the outer magnetic shielding shells and corresponding baffles. The short magnetic focusing device and method of the invention have the advantages of effective cooling of coils, fine adjustment of coaxiality, fine adjustment of the gap of the pole shoes, and long-time stable work.
Description
Technical field
The invention belongs to ultrafast diagnostic techniquess field, it 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 microcosmoss to the understanding of nature.Reflection natural world presentation process the most essential is all sent out
In molecule or atomic interior, its corresponding time scale, can all in psec, femtosecond or even Ah's second-time (referred to as ultrafast process) for life
Meaning " fast changing ".Understanding in depth of these ultrafast processes, needs the diagnostic tool by having superelevation time-space resolution invariably
Make up the deficiency of human eye resolution capability (1/24 Miao ＆0.1 millimeter).Ultrafast electric diffraction (UED), ultrafast electron crystallography (UEC),
The ultrafast diagnostic techniquess such as ultrafast ultramicroscope (UEM) and streak camera (Streak Camera) are with its psec or even sub- femtosecond
The ultrahigh time resolution of magnitude is widely used in material science, physicss, chemistry and the ultrafast mistake such as structural phase transition in biology
The detection study of journey, helps people to understand the process of these Fast Phenomenas change with this, greatly increases the mankind for objective generation
The depth of boundary's understanding, improves the ability of mankind's nature remodeling.Challenge is how of these ultrafast diagnostic techniquess obtains high electric charge
Density (high brightness), the high-quality electron source of high time-space resolution, it determines our detection accuracies to microcosmoss.
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 all may be changed, and often results in electronics
Horizontal (spatial discrimination) of pulse and longitudinally (time resolution) broadening.However, detecting for high-spatial and temporal resolution, ultrafast diagnosis sets
For standby, the size of electronic impulse beam spot directly determines the spatial resolving power of this system to a certain extent, and it has to little
Just it is provided that enough spatial resolution carry out the detection study of ultrafast process in 500 μm about.Literary composition with reference to Siwick et al.
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 the electronic impulse of energy 30keV) just broadening to 6.5ps (1ps=10-12s).Meanwhile, with reference to Robinson etc.
The document of people, on the premise of cathode and anode spacing 15mm, accelerating potential 45kV, the electronic impulse of 200 μm of initial beam size is not
After 40cm is propagated in line focus compression, natural broadening to～1.1mm, and after introducing the magnetic focusing that intensity is 37.8mT, electron beam
Speckle is contracted to～100 μm, and spatial resolving power is obviously improved.
As can be seen here, in ultrafast diagnostic techniquess, the focusing arrangement introducing high stability carries out the horizontal pressure of electronic impulse
Contracting, suppresses electron beam space charge effect, reduces because the presence of space charge effect and the impact to electron beam divergence degree, keeps away
Exempt from it to come along three dimensions diffusion in flight course, on the premise of meeting time resolution, farthest compress beam spot
Size is most important.The Electron Beam Focusing means commonly used at present 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 there are two planes of symmetry, continued through after a series of equipotential surfaces at one using interelectrode potential official post electron beam
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 characteristic cancel each other
Remaining, i.e. a kind of " difference " result.Though this electrostatic focusing arrangement has the less advantage of spherical aberration, still suffer from larger distortion
, lead to obtain image widen, and due to acceleration in electrostatic focusing lens for the different electronics with slow down uneven so that
There is a certain degree of broadening, energy dispersion is big, space charge effect is notable, to high-energy photoelectron focusing power after pulse outgoing
Weaker, and photoelectron can be caused to slow down, electron-optical system is longer.All these unfavorable factors all lead to electron transit time
Disperse increases, and is unfavorable for the raising of system spatial and temporal resolution.
Compare electrostatic focusing, magnetic focusing has the advantage that：1. structure is simple, and the exciting current by change coil is permissible
Realize continuously adjusting of focal length and amplification, can obtain, using short magnetic focusing, the charge pattern zooming in or out；And in electrostatic
In focusing, the voltage needing applying very high can be only achieved this effect.2. magnetic focusing exciting current is generally between 0～2A, corresponding
Voltage<100V, no punctures sparking problem；And generally to easily cause electricity plus ten thousand volts of high pressure on the electrode of electrostatic lenses
Frequent sparking between pole.3. the aberration of magnetic lenses is less.4., under the action of a magnetic field, 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 adopt short magnetic to gather
Coke installation.
For the magnetic focusing arrangement commonly used at present, the heat effect of coil is a big problem, and it seriously governs system
Working time and job stability.Heating leads to the current fluctuation of 0.01A that 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 copper conductor resistance to increase, 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 its alignment with cavity also drastically influence the stability of beam spot.If cooling and alignment are bad, must
The beam spot causing being shaken, thus causing resolution characteristic to decline, greatly affecting the time-space resolution ability of electronic impulse, very
Lead to not carry out the detection of ultrafast phenomena in big degree, so the cooling behaviour of device must be focused using effective means
Make and alignment accurate adjustment.Meanwhile, focusing arrangement is all placed on a fixed position by the substantial amounts of ultrafast diagnostic device of document report
On, or very close to anode, it is used only at detector obtain best focusing electron beam.Come from whole experimentation
Consider, this is often possible to not be optimum focal position.Critically adjusting magnetic gap is the equal of to adjust the action of a magnetic field scope, fine setting
Focus characteristics, make whole system be in the state of optimum.
CN1851843A and CN1851450A discloses the device that a kind of ultrashort electron pulses produce and control, magnetic therein
Coil cannot effectively cool down as important compression member and coaxially finely tune, 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, mainly by line bag, magnetic shield shell forms, by xyz displacement platform come fine adjustment in 013109.
The coaxial deviation of the system causing because coiling is uneven is it is ensured that electronic impulse passes through from lens centre.Using copper braid over braid even
Connect the cooling that liquid nitrogen container carries out magnetic lenses.Although this 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.
As can be seen that the device and method of existing ultrafast electronic impulse transverse compression exists cannot effectively cool down, it is serious
Impact job stability and time, coaxial fine setting and the accurate adjustment of pole shoe gap or 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.
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 provides a kind of short magnetic focusing arrangement for ultrafast electronic impulse transverse compression.
The technical solution of the present invention is：A kind of short magnetic focusing arrangement for ultrafast electronic impulse transverse compression, its
It is characterized in that：
The inner magnetic screen shell of the bobbin including the tubulose being coaxially disposed and tubulose；Respectively arrange on two end faces of described bobbin
There is a circular baffle plate, the interior circular diameter of baffle plate is equal to the diameter of bobbin, 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, are provided with the coil being wound on bobbin in 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 the first external magnetism shielding shell is provided with the first pole shoe stretching in bobbin, the second outer magnetic
The central coaxial of shielding case is provided with the second pole shoe stretching in bobbin, forms magnetic gap between the first pole shoe and the second pole shoe；
At the fastening of described first external magnetism shielding shell and the second external magnetism shielding shell, magnetic gap adjusting means is installed；
It is provided with same axis adjustment device on the outer face of described first external magnetism shielding shell and the second external magnetism shielding shell；
It is provided with cooling between the inner face of described first external magnetism shielding shell and the second external magnetism shielding shell and corresponding baffle plate
System.
First same axis adjustment device is provided with the outer face of above-mentioned first external magnetism shielding shell, outside the second external magnetism shielding shell
Second same axis adjustment device is provided with end face；Described same axis adjustment device includes multiple rotary screws being disposed radially.
Form toroidal cavity between the inner face of above-mentioned first external magnetism shielding shell and corresponding baffle plate, in cavity, be provided with the
One cooling chamber and the second cooling chamber；Cooling entrance is provided with the first cooling chamber, the second cooling chamber is provided with coolant outlet；
Form toroidal cavity between the inner face of described second external magnetism shielding shell and corresponding baffle plate, in cavity, be provided with the
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 described coolant outlet is located at the second cooling chamber bottom, described cold
But passage is located at the first cooling chamber and the second cooling chamber top.
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；Described inner magnetic screen shell, the first external magnetism shielding shell and the second external magnetism shielding shell
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：
The short magnetic focusing arrangement being used for ultrafast electronic impulse transverse compression is set in the vacuum cavity of ultrafast electron motion
Outside, then carries out alignment regulation, magnetic gap is adjusted and temperature control；
Alignment is adjusted：Turn first respectively with axis adjustment device and second with the rotary screw on axis adjustment device, adjust
Relative position between whole described short magnetic focusing arrangement and vacuum cavity, 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
The distance between boots and the first pole shoe, judge magnetic gap size according to the rule 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 first cooling chamber top and fill the 3rd cooling chamber, then pass through another cooling duct
Flow into the second cooling chamber, then derive from coolant outlet；Enter trip temperature by adjusting the flow velocity of coolant or cooling gas
Control.
The beneficial effects of the present invention is：
(1) present invention has the advantages that effectively to cool down coil and alignment is fine-tuning and pole shoe gap can accurate adjustment, especially
Achievable long-time stable work.
(2) present invention passes through to design cooling system, can carry out effective temperature-reducing using air-cooled or water-cooled, solve existing focusing
The cooling heat dissipation problem that system works long hours, raising system causes to elevate the temperature the current fluctuation causing due to coil Joule heat
Job stability.
(3) present invention is provided with coaxial fine tuning structure, coaxially can be adjusted using rotary screw, solves existing focusing and fills
Put the coaxial sex chromosome mosaicism causing due to device fabrication and coiling uniformity.
(4) present invention passes through to arrange telescopic pole shoe with a scale, can continuously adjust the action of a magnetic field region, changes magnetic
Field action center, solve the problems, such as existing system pole shoe gap cannot accurate adjustment, preferably actual compression effect is adjusted to mould
Propose the performance indications of timing, improve the time-space resolution of system.
Brief description
Fig. 1 is the short magnetic focusing arrangement generalized 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 of the present invention corresponding Magnetic Induction Density Distribution figure under different magnetic gap width conditions.
Fig. 7 is the changing trend diagram with magnetic gap width for the magnetic induction of the short magnetic focusing arrangement of the present invention.
Fig. 8 is the angle of pitch instruction figure of the short magnetic focusing arrangement of the present invention.
Fig. 9 is the Magnetic Induction Density Distribution figure on the short magnetic focusing arrangement of the present invention corresponding longitudinal axis under the different angles of pitch.
Specific embodiment
The present invention provides one kind can be cooled down, the short magnetic focusing dress simultaneously magnetic gap width and alignment being 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 structure of present pre-ferred embodiments includes magnetic in the tubulose bobbin 1 being coaxially disposed and tubulose
Shielding case 2；One 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 is 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, is provided with the coil 4 being wound on bobbin in cavity；
This short magnetic focusing arrangement also includes two external magnetism shielding shells, the first external magnetism shielding shell 5 and the second external magnetism shielding shell 6 edge
The axial direction of bobbin 1 is fastened on the outside of inner magnetic screen shell 2.Bobbin 1 is enclosed in interior, the leakage in suppression magnetic field by inner magnetic screen shell 2.
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 is more than the length of the second external magnetism shielding shell 6.
The central coaxial of the first external magnetism shielding shell 5 is provided with the first pole shoe 7 stretching in bobbin, the second external magnetism shielding shell 6
Central coaxial be provided with the second pole shoe 8 stretching in bobbin, between the first pole shoe 7 and the second pole shoe 8 formed magnetic gap；Outside first
The distance between magnetic shield shell 5 and the second external magnetism shielding shell 6 are equal to the distance between the first pole shoe 7 and the second pole shoe 8, therefore logical
Cross the distance reading between two external magnetism shielding shells and just can directly obtain magnetic gap size.Magnetic gap is accurate adjustable in 0～39mm, this
So that magnetic field can concentrate in the gap of this 0～39mm, the cross direction profiles width reducing magnetic field increases sample simultaneously
Field intensity.Just can be produced non-during use at 0～39mm magnetic gap by the exciting currents different to the applying of short magnetic focusing arrangement
Uniform magnetic field is 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, that is, the length of the first pole shoe 7 is more than the length of the second pole shoe 8.Initial magnetic gap institute
The one end being located proximate to short magnetic focusing arrangement rather than be located at center, so setting advantage be some need electronics drift about away from
From less when just complete focus in the case of, initial magnetic gap position the closer to edge just can more early complete focus on because short magnetic
Focusing arrangement itself also occupies certain axial length.
At the fastening of the first external magnetism shielding shell 5 and the second external magnetism shielding shell 6, magnetic gap adjusting means is installed；Magnetic gap adjusts dress
Put 9 and include the finely divided scale for weighing distance between the first pole shoe and the second pole shoe；Can be vertically by this rule
Accurately running fix, and then accurate regulation magnetic gap size.
It is provided with first with axis adjustment device 10, outside the second external magnetism shielding shell 6 on the outer face of the first external magnetism shielding shell 5
It is provided with second with axis adjustment device 11 on end face；It is made up of multiple rotary screws being disposed radially with axis adjustment device；Logical
Cross and slowly turn screw to finely tune the alignment outside short magnetic focusing arrangement and vacuum cavity, screw can also be fixed and mix up simultaneously
State afterwards.
Bobbin can be using rustless steel (316L or 304L), pyrite or other non-magnetic material；Focus coil adopts
Material can be the copper conductor of 0.5-1mm；Inside and outside magnetic shield shell (and pole shoe) uses the soft iron material with high magnetic permeability
Material (μ>200), such as pure iron, ferrocobalt or Ⅴ-permandur alloy, its Main Function is exactly in narrow magnetic by magnetically confined
At gap, increase maximum axial magnetic field, and prevent leakage magnetic field, pole shoe is the real position focusing on；In whole inner magnetic screen
Also has the permalloy that a layer thickness is 1-2mm, for preventing leakage magnetic field further outside shell.
Referring to Fig. 3 to Fig. 5, between the inner face of the first external magnetism shielding shell 5 and corresponding baffle plate 3, form toroidal cavity, empty
Intracavity is provided with the first cooling chamber 12 and the second cooling chamber 13；Cooling entrance 15, the second cooling are provided with the first cooling chamber 12
Coolant outlet 16 is provided with room；
Form toroidal cavity between the inner face of the second external magnetism shielding shell 6 and corresponding baffle plate 3, in cavity, be provided with the 3rd
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, one of with first
Cooling chamber 12 connects, and another one is connected with the second cooling chamber 13.Cooling entrance 15 is located at the first cooling chamber 12 bottom, cools down out
Mouth 16 is located at the second cooling chamber 13 bottom, and cooling duct 17 is located at the top of the first cooling chamber 12 and the second cooling chamber 13.Pass through
Connect coolant or cooling gas can cool down to short magnetic focusing arrangement.
For the position accurately installing external magnetism shielding shell and be accurately positioned cooling entrance, coolant outlet, can be in bobbin
The location hole 9 of insertion before and after arranging between two cooling ducts at top.
Carry out short magnetically focused method using the short magnetic focusing arrangement that the present invention provides specific as follows：
First the short magnetic focusing arrangement in the present invention is set in outside the vacuum cavity of ultrafast electron motion, then carries out
Alignment is adjusted, magnetic gap is adjusted and temperature control；
Alignment is adjusted：Turn first respectively with axis adjustment device 10 and second with the rotation spiral shell on axis adjustment device 11
Nail, adjusts the relative position between short magnetic focusing arrangement and vacuum cavity, keeps coaxial；
Magnetic gap is adjusted：Keep the second external magnetism shielding shell 6 position to fix, move axially the first external magnetism shielding shell 5, change second
The distance between pole shoe 8 and the first pole shoe 7, judge magnetic gap size according to the rule 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 first cooling chamber top and fill the 3rd cooling chamber 14, then through others
Cooling duct 17 flows into the second cooling chamber 13, then derives from coolant outlet 16；By adjusting coolant or cooling gas
Flow velocity is carrying out temperature control.After this cooling circulation, two sides of bobbin and upper surface all can form cooling surface,
Thus guiding the heat that coil produces in time, play the effect of stable focusing device temperature.This circulates as the most reasonably circulating road
Footpath, no matter how focusing arrangement adjusts effectively is cooled down with always can keeping maximum film-cooled heat.
Fig. 6 and Fig. 7 be under different magnetic gap width corresponding magnetic induction with its with magnetic gap width variation tendency.Add
When magnetic shield shell and pole shoe, magnetic field is more concentrated, and peak value is higher, and magnetic gap width is less, and magnetic field is got over and concentrated, and peak value is bigger.For
An equal amount of magnetic field, the short magnetic focusing arrangement with pole shoe only needs less electric current, contributes to reducing 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
(this angle of pitch is as shown in Figure 8).Magnetic field is moved to y-axis negative direction with the increase of the anglec of rotation, and that is, 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 that
Electronic impulse has the key factor of preferable focus characteristics.
Claims (10)
1. a kind of short magnetic focusing arrangement for ultrafast electronic impulse transverse compression it is characterised in that：
The inner magnetic screen shell of the bobbin including the tubulose being coaxially disposed and tubulose；It is each provided with one on two end faces of described bobbin
Individual 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 the straight of inner magnetic screen shell
Footpath；Inner magnetic screen shell, bobbin and two baffle plates surround toroidal cavity jointly, are provided with the coil being wound on bobbin in cavity；
Also include two external magnetism shielding shells, the first external magnetism shielding shell and the second external magnetism shielding shell are fastened on interior magnetic along the axial direction of bobbin
The outside of shielding case；The central coaxial of the first external magnetism shielding shell is provided with the first pole shoe stretching in bobbin, the second external magnetism shielding
The central coaxial of shell is provided with the second pole shoe stretching in bobbin, forms magnetic gap between the first pole shoe and the second pole shoe；
At the fastening of described first external magnetism shielding shell and the second external magnetism shielding shell, magnetic gap adjusting means is installed；
It is provided with same axis adjustment device on the outer face of described first external magnetism shielding shell and the second external magnetism shielding shell；
It is provided with cooling system between the inner face of described first external magnetism shielding shell and the second external magnetism shielding shell and corresponding baffle plate.
2. the short magnetic focusing arrangement for ultrafast electronic impulse transverse compression according to claim 1 it is characterised in that：Institute
First same axis adjustment device is provided with the outer face stating the first external magnetism shielding shell, the outer face of the second external magnetism shielding shell is arranged
There is the second same axis adjustment device；Described same axis adjustment device includes multiple rotary screws being disposed radially.
3. the short magnetic focusing arrangement for ultrafast electronic impulse transverse compression according to claim 2 it is characterised in that：Institute
State between the inner face of the first external magnetism shielding shell and corresponding baffle plate formation toroidal cavity, be provided with cavity the first cooling chamber and
Second cooling chamber；Cooling entrance is provided with the first cooling chamber, the second cooling chamber is provided with coolant outlet；
Form toroidal cavity between the inner face of described second external magnetism shielding shell and corresponding baffle plate, be provided with the 3rd in cavity cold
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 for ultrafast electronic impulse transverse compression according to claim 3 it is characterised in that：Institute
State cooling duct to be arranged on inside bobbin.
5. the short magnetic focusing arrangement for ultrafast electronic impulse transverse compression according to claim 4 it is characterised in that：Institute
State cooling entrance and be located at the first cooling chamber bottom, described coolant outlet is located at the second cooling chamber bottom, and described cooling duct is located at
First cooling chamber and the second cooling chamber top.
6., according to the described short magnetic focusing arrangement for ultrafast electronic impulse transverse compression arbitrary in claim 1-5, it is special
Levy and be：The axial length of described first pole shoe is more than the axial length of the second pole shoe.
7. the short magnetic focusing arrangement for ultrafast electronic impulse transverse compression according to claim 6 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 for ultrafast electronic impulse transverse compression according to claim 7 it is characterised in that：Institute
State the distance between the first pole shoe and the second pole shoe to adjust in 0-39mm.
9. the short magnetic focusing arrangement for ultrafast electronic impulse transverse compression according to claim 8 it is characterised in that：Institute
State bobbin to be made up of non-magnetic material；Described 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.
10. a kind of short magnetic focusing method for ultrafast electronic impulse transverse compression it is characterised in that：Comprise the following steps：
The short magnetic focusing arrangement being used for ultrafast electronic impulse transverse compression is set in outside the vacuum cavity of ultrafast electron motion,
Then carry out alignment regulation, magnetic gap is adjusted and temperature control；
Alignment is adjusted：Turn first respectively with axis adjustment device and second with the rotary screw on axis adjustment device, adjust institute
State the relative position between 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 shoe with
The distance between first pole shoe, judges magnetic gap size according to the rule in magnetic gap adjusting means；
Temperature control：Coolant or cooling gas, coolant or cooling gas filling first cooling are passed through by cooling entrance
Behind room, flowed into by the cooling duct at the first cooling chamber top and fill the 3rd cooling chamber, then flow into through another cooling duct
Second cooling chamber, then derives from coolant outlet；Carry out temperature control by adjusting the flow velocity of coolant or cooling gas.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110189969A (en) * | 2019-06-05 | 2019-08-30 | 中国工程物理研究院激光聚变研究中心 | A kind of magnetically confined pulse broadening imaging system |
| CN112563098A (en) * | 2021-01-10 | 2021-03-26 | 赣南师范大学 | Direct current photocathode ultrafast electron gun with immersion type electrostatic lens |
| CN113984813A (en) * | 2021-09-27 | 2022-01-28 | 上海大学 | High-throughput thin film crystal structure characterization device and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008120739A1 (en) * | 2007-03-29 | 2008-10-09 | Jtekt Corporation | Torque detecting device |
| 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 |
| US20130193778A1 (en) * | 2010-07-05 | 2013-08-01 | Olympus Winter & Ibe Gmbh | Electromagnetic actuator for a surgical instrument |
| 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, |
-
2016
- 2016-10-19 CN CN201610910739.5A patent/CN106409635B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008120739A1 (en) * | 2007-03-29 | 2008-10-09 | Jtekt Corporation | Torque detecting device |
| 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 |
| US20130193778A1 (en) * | 2010-07-05 | 2013-08-01 | Olympus Winter & Ibe Gmbh | Electromagnetic actuator for a surgical instrument |
| 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, |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110189969A (en) * | 2019-06-05 | 2019-08-30 | 中国工程物理研究院激光聚变研究中心 | A kind of magnetically confined pulse broadening imaging system |
| CN110189969B (en) * | 2019-06-05 | 2024-03-22 | 中国工程物理研究院激光聚变研究中心 | Magnetic field constraint pulse broadening imaging system |
| CN112563098A (en) * | 2021-01-10 | 2021-03-26 | 赣南师范大学 | Direct current photocathode ultrafast electron gun with immersion type electrostatic lens |
| CN112563098B (en) * | 2021-01-10 | 2023-06-09 | 赣南师范大学 | Direct current photocathode ultrafast electron gun with immersed electrostatic lens |
| CN113984813A (en) * | 2021-09-27 | 2022-01-28 | 上海大学 | High-throughput thin film crystal structure characterization device and method |
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