CN107222968A - Can device and choosing energy method applied to the electronics choosing in Laser Driven coda Q values accelerator - Google Patents
Can device and choosing energy method applied to the electronics choosing in Laser Driven coda Q values accelerator Download PDFInfo
- Publication number
- CN107222968A CN107222968A CN201710413281.7A CN201710413281A CN107222968A CN 107222968 A CN107222968 A CN 107222968A CN 201710413281 A CN201710413281 A CN 201710413281A CN 107222968 A CN107222968 A CN 107222968A
- Authority
- CN
- China
- Prior art keywords
- magnet
- energy
- axis
- electronics
- choosing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/001—Arrangements for beam delivery or irradiation
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/04—Magnet systems, e.g. undulators, wigglers; Energisation thereof
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Optics & Photonics (AREA)
- Particle Accelerators (AREA)
Abstract
Can device and choosing energy method the invention discloses a kind of electronics choosing being applied in Laser Driven coda Q values accelerator.The present invention sequentially passes through four blocks of magnet using electron beam, first is identical with the magnetic direction of the 4th magnet, second is identical with the magnetic direction of the 3rd magnet, and the magnetic direction of first and second magnet is reverse, second and the 3rd set between magnet choosing can structure so that the electronics of required energy is 0 along incident direction and offset after the 4th magnet outgoing；The present invention can select 50MeV~below 100MeV electron beam；High energy resolution, 1% energy resolution can be reached for 100MeV electron beam；Below 50Mev low-energy electron can be monitored；The interference of high energy electron and background radiation can be eliminated；The lateral deflection of electronics can be eliminated so that exit direction and incident direction are consistent；Electron exit position is fixed with the realization beneficial to experiment of being clashed with light laser so that subsequent experimental is more convenient.
Description
Technical field
The present invention relates to electronics choosing energy device, and in particular to a kind of electronics choosing being applied in Laser Driven coda Q values accelerator
Can device and choosing energy method.
Background technology
Tajima and Dawson in proposing excited in the plasma using ultra-short pulse laser first etc. for 1979
Ion bulk wave is to accelerate the concept of electronics.When a bundle of pulsed laser is propagated in cold plasma of the density less than critical density
When, the pondermotive force of laser can arrange plasma electron from the region that laser passes through to both sides.Pass through rear, space in laser
Separation of charge power again can retract this part electronics their original positions, cause electronics to be oscillated about in their position,
Caused by wave inception, and this ripple are excited in plasma there is axial component in electric field.This ripple excited can follow laser to exist
Propagate in plasma, its phase velocity is close to the light velocity.Relativistic electron beam can be propagated with the ripple in plasma,
And it is in very long distance in the axial electric field of acceleration, is accelerated to very high energy.The acceleration of this acceleration mechanism
Gradient is broken condition by nonrelativistic ripple and limited.
Before more than ten years, obtained using chirped pulse amplification after ultra short intense laser pulse, it has been found that generation is shaken greatly
Width plasma wave becomes easier to, and the acceleration electron energy experimentally obtained also gradually increases.Earlier trials find that these add
Fast electronics generally has very wide power spectrum, is not suitable for practical application.In September, 2004, Nature magazines have been published from method simultaneously
State, the achievement in research of three computer MSR Information systems of Britain and the U.S., 3 laboratory independence realizations plasma wave accelerates to produce quasi- list
Electron beam of the energy of energy in 100MeV or so so that laser plasma is accelerated as very popular research topic, and this is
The application of later stage electron beam adds very big confidence.
With respect to having with traditional electron accelerator, size is small, accelerating gradient is big, sexual valence in itself for laser wake field acceleration
Than it is high the advantages of, and LWFA accelerators output electron beam there is the spies such as small beam spot, pulse narrow (femtosecond magnitude), brightness height
Point, has good application prospect in many fields.But Electron Beam Quality is main in injection, acceleration and transmission three phases
It is affected, with the big angle of divergence, the scattered shortcoming of big energy.For further experimental applications, such as dorsad Compton scattering
Light source and free-electron laser etc. have vital influence.
This just selects the research and development of energy device to provide and applies premise for electronics.Electronics choosing energy device can provide single energy for backend application end
Electron beam, be that the application of quasi-monoenergetic beams that laser plasma accelerator is produced provides safeguard.
2012, Japanese Miura et al. experimentally confirmed what is exported using laser wake field acceleration for the first time
Electron beam can produce hard X ray by inverse Compton scattering.Femto-second laser pulse (800nm, 700mJ, 40fs) incides 1.7
×1019cm-3Helium nozzle on, by coda Q values acceleration mechanism, output the quasi- Dan Neng electricity of 90pC, central energy in 65MeV
Beamlet.The electron beam and the femtosecond laser of oblique incidence (800nm, 140mJ, 100fs) collide, and pass through inverse Compton scattering machine
System, high energy electron transfers energy to photon, is about by using having detected energy to the imaging screen that X-ray senses experimentally
60KeV, the angle of divergence is~5mrad hard X ray, and conventional efficient is single-shot pulses generation~2 × 107Individual photon.
So, it is possible to use choosing can the electronics of appropriate energy selected out of device and light laser head-on collision set for this platform formula against Kang Pu
Pause scattering light source.
The content of the invention
In view of the above-mentioned problems, the present invention proposes a kind of electronics choosing energy device being applied in Laser Driven coda Q values accelerator
And choosing can method.
It is an object of the present invention to propose that a kind of electronics choosing being applied in Laser Driven coda Q values accelerator can device.
The electronics being applied in the Laser Driven coda Q values accelerator choosing energy device of the present invention includes：First to fourth magnet,
Choosing can structure and shielding construction；Wherein, choosing energy structure setting is between the second magnet and the 3rd magnet；Laser coronal region electronics adds
The electron beam that speed is obtained enters the magnetic field of the first magnet along the x-axis direction, and sequentially passing through the magnetic field of the second magnet, choosing can structure and the
The magnetic field of three magnet, from the magnetic field outgoing of the 4th magnet；Shielding construction is placed in the afterbody of the 4th magnet；The direction in magnetic field is along y
Axle, the magnetic direction of the first magnet is identical and equal in magnitude with the magnetic direction of the 4th magnet, the second magnet and the 3rd magnet
Magnetic direction is identical and equal in magnitude, and the magnetic field of the first magnet is opposite with the magnetic direction of the second magnet；Electron beam is along x-axis
Direction enters the magnetic field of the first magnet, and in the presence of the magnetic field of y directions, the movement locus of electron beam shifts along the z-axis direction
And there is angle with x-axis, the lower electronics of energy deviates bigger, so that electron beam is different according to energy, arranged successively along z-axis；
The magnetic direction of second magnet and the first magnet are on the contrary, set the size and size in the magnetic field of the second magnet so that from the second magnetic
The electron beam of iron outgoing and the angle of x-axis are 0；Electron beam enters to be selected in energy structure along x-axis from the second magnet outgoing, and choosing energy structure is
With certain thickness flat board, and centre has the slit parallel to x-axis, and the position of slit is located at the electron institute of required energy
The position of the z-axis at place, so that the electron beam of required energy enters the 3rd magnet through the slit of choosing energy structure；Sequentially pass through the 3rd
After the 4th magnet, the offset of the electronics of required energy along z-axis is 0, and along the x-axis direction from the 4th magnet outgoing, so that
The electronics of required energy is selected out；It is placed on the shielding construction shielding ray of the 4th magnet afterbody.
Each block of magnet includes yoke and magnet steel, wherein, yoke is back-shaped framework, and a pair of relative inner surfaces are set respectively
It is equipped with magnet steel.The magnetic pole strength of two magnet steel has gap, and the electron beam with the angle of divergence is passed through between two magnetic pole strengths, relatively
Two magnet steel magnetic pole strength between select suitable gap, with avoid or as far as possible reduce electron beam get on magnetic pole strength.According to
The angle of divergence of electron beam, the distance of the magnet of electron source distance first and the distance drifted about in magnet calculate and obtain magnetic pole strength
Gap.
Further, the side that magnet steel is not provided with yoke is provided with opening, if electron beam is along x-axis positive direction
Into the magnetic field of the first magnet, the magnetic direction of the first magnet is along y-axis positive direction, then the magnetic field of the second magnet is along y-axis negative direction,
Electron beam enters the first magnet, and under the influence of a magnetic field, the movement locus of electron beam shifts and and x along z-axis negative direction
Axle has angle, and the lower electronics of energy deviates bigger, and the yoke for being located at z-axis negative direction in the first magnet is provided with the first opening,
Energy deflects away from magnet less than the electronics of selection threshold value at the first opening；The magnetic direction of second magnet and the first magnet on the contrary,
The yoke that second magnet is located at z-axis positive direction is provided with the second opening, can both prevent high energy electron from directly beating to draw in yoke
High energy bremsstrahlung is played, again can be by inserting shielding material at opening, to shield background radiation；If electron beam is along x-axis
Positive direction enters the magnetic field of the first magnet, and the magnetic direction of the first magnet is along y-axis negative direction, then the magnetic field of the second magnet is along y-axis
Positive direction, the then yoke for being located at z-axis positive direction in the first magnet is provided with the first opening, energy less than selection threshold value electronics from
Magnet is deflected away from first opening, the surface that the second magnet is located at z-axis negative direction is provided with the second opening.
IP plates are placed in the outside of the opening of the first magnet, the monitoring of low-energy electron is carried out.
There is spacing between first magnet and the second magnet, and the 3rd magnet and the 4th magnet, two magnetic directions are opposite
Magnet it is placed side by side, opposite polarity magnetic pole strength can produce magnetic field, and the magnetic field of magnet in itself can be interfered, influence magnet
Original magnetic field's regularity, in order to keep leaving spacing between magnetic field's regularity, two blocks of magnet steel, spacing is 3mm~10mm.
The energy resolution of the thickness of choosing energy structure and the widths affect whole device of slit, the material of choosing energy structure is also
The choosing energy effect of electronics and the shield effectiveness of bremsstrahlung can be influenceed.For the electron beam at low scattered angle, the slit of choosing energy structure
Energy resolution be less than the intrinsic resolutions of the first and second magnet, but for height scattered angle electron beam group, slit rises
To the good effect for improving energy resolution.When the width of slit takes 1mm, electronics selects the energy resolution after energy to be better than 1%.
The thickness of choosing energy structure so that the energy of the electron beam near required energy electron has been decayed, and energy deviates more, so that
More clearly separate, improve resolution ratio.Width, the thickness of choosing energy structure and the magnet intrinsic resolution of slit determine to differentiate
Rate.
The presence of slit, its width size determines the size of resolution ratio, but also reduces stream by force, is examined so to integrate
Consider, slit is set to that size is adjustable, the convenient follow-up regulation to Bunch current and electron energy resolution ratio.According to energy resolution
The requirement of rate calculates the thickness and the width of slit for obtaining choosing energy structure.
In view of mask completely high energy electron needs choosing can structure material thickness do not meet more greatly saving space into
This demand, it is of the invention to pass through the method for selecting energy structural damping electron beam so that the electronics of required energy is by choosing energy structure
Slit outgoing along z-axis offset be 0 position, without energy electronics then need by choosing can structure material decay
Effect so that the offset in their Exit positions skew z directions is 0 position, so as to reach the electronics Zhen required energy
The effect elected.
The material of choosing energy structure uses the material of low atomic number, such as aluminium.
Energy is selected it is another object of the present invention to provide a kind of electronics being applied in Laser Driven coda Q values accelerator
Method.
The electronics being applied in the Laser Driven coda Q values accelerator choosing energy method of the present invention, comprises the following steps：
1) laser coronal region electronics accelerates obtained electron beam to enter the magnetic field of the first magnet along the x-axis direction, sequentially passes through
The magnetic field of second magnet, the magnetic field for selecting energy structure and the 3rd magnet, from the magnetic field outgoing of the 4th magnet；The direction in magnetic field along y-axis,
The magnetic direction of first magnet is identical and equal in magnitude with the magnetic direction of the 4th magnet, the magnetic field of the second magnet and the 3rd magnet
Direction is identical and equal in magnitude, and the magnetic field of the first magnet is opposite with the magnetic direction of the second magnet；
2) electron beam enters the magnetic field of the first magnet, in the presence of the magnetic field of y directions, the motion of electron beam along the x-axis direction
Track shifts and has angle with x-axis along the z-axis direction, and the lower electronics of energy deviates bigger, so that electron beam is according to energy
Amount is different, is arranged successively along z-axis；
3) magnetic direction of the second magnet and the first magnet are on the contrary, the size and size in the magnetic field of the second magnet of setting, make
From the angle of the electron beam of the second magnet outgoing and x-axis be 0；
4) electron beam enter to be selected in along x-axis from the second magnet outgoing can structure, choosing can structure be with certain thickness flat board,
Material uses the material of low atomic number, and the middle slit having parallel to x-axis, and the position of slit is located at required energy
The position of z-axis residing for electronics, by adjusting the position of slit and the thickness of choosing energy structure so that the electron beam of required energy
Slit through choosing energy structure enters the 3rd magnet；
5) sequentially pass through after the third and fourth magnet, the offset of the electronics of required energy along z-axis is 0, and along x-axis side
To from the 4th magnet outgoing, so that the electronics of required energy be selected out.
Advantages of the present invention：
The present invention sequentially passes through four blocks of magnet using electron beam, and first is identical with the magnetic direction of the 4th magnet, the second He
The magnetic direction of 3rd magnet is identical, and first and second magnet magnetic direction reversely, in second and the 3rd between magnet
Choosing energy structure is set, so that the electronics of required energy is 0 along incident direction and offset after the 4th magnet outgoing；The present invention
50MeV~below 100MeV electron beam can be selected；High energy resolution, 1% energy can be reached for 100MeV electron beam
Measure resolution ratio；Below 50Mev low-energy electron can be monitored；The interference of high energy electron and background radiation can be eliminated；Energy
Enough eliminate the lateral deflection of electronics so that exit direction and incident direction are consistent；Electron exit position be fixed with beneficial to and
The realization of light laser head-on collision experiment so that subsequent experimental is more convenient.
Brief description of the drawings
Fig. 1 selects the original of one embodiment of energy device for the electronics being applied in Laser Driven coda Q values accelerator of the present invention
Reason figure；
Fig. 2 selects the choosing of one embodiment of energy device for the electronics being applied in Laser Driven coda Q values accelerator of the present invention
The schematic diagram of energy structure.
Embodiment
Below in conjunction with the accompanying drawings, by specific embodiment, the present invention is expanded on further.
As shown in figure 1, the electronics being applied in the Laser Driven coda Q values accelerator choosing energy device of the present embodiment includes：First
To the 4th magnet 1~4, choosing energy structure 5 and shielding construction 6；Wherein, choosing energy structure 5 is arranged on the second magnet 2 and the 3rd magnet 3
Between；Laser coronal region electronics accelerates obtained electron beam to enter the magnetic field of the first magnet along the x-axis direction, sequentially passes through the second magnetic
The magnetic field of iron, the magnetic field for selecting energy structure and the 3rd magnet, from the magnetic field outgoing of the 4th magnet；The direction in magnetic field is along y-axis, the first magnetic
The magnetic direction of iron is identical and equal in magnitude with the magnetic direction of the 4th magnet, the magnetic direction of the second magnet 2 and the 3rd magnet 3
It is identical and equal in magnitude, and the magnetic field of the first magnet is opposite with the magnetic direction of the second magnet；Set in the afterbody of the 4th magnet
Put shielding construction 6；Electron beam enters the magnetic field of the first magnet, in the presence of the magnetic field of y directions, the fortune of electron beam along the x-axis direction
Dynamic rail mark shifts and has an angle with x-axis along the z-axis direction, and the lower electronics of energy deviates bigger, thus electron beam according to
Energy is different, is arranged successively along z-axis；The direction of second magnet is with the first magnet on the contrary, the size in the magnetic field of the second magnet of adjustment
And size so that the angle from the electron beam of the second magnet outgoing and x-axis is 0；Electron beam enters along x-axis from the second magnet outgoing
Choosing can structure 5, choosing can structure be with certain thickness flat board, the plane where the surface of flat board parallel to yz faces, and in
Between there is slit parallel to x-axis, the position of slit is located at the position of the z-axis residing for the electronics of required energy, so that required energy
The electron beam of amount enters the 3rd magnet through the slit of choosing energy structure；Sequentially pass through after the third and fourth magnet, required energy
Offset of the electronics along z-axis is 0, and along the x-axis direction from the outgoing of the 4th magnet 4, so that the electronics of required energy be selected out
Come；It is placed on the shielding construction shielding ray of the 4th magnet afterbody.
In the present embodiment, electron beam along x positive directions, first and the 4th magnet magnetic field along y-axis positive direction (vertical paper to
It is interior), second and the 3rd magnet magnetic field along y-axis negative direction (vertical paper is outside), the downside opening of the yoke of the first magnet,
The upper side opening of the yoke of second magnet.Splice and combine for convenience and carry out follow-up installation, four blocks of magnet are except openings
To beyond difference, other designs use identical size.The size of single magnet is as follows：
It can be obtained by magnet simulation, the design of whole choosing energy device magnet has the characteristics that：
A) the first and second magnet are identical, and second is identical with the 3rd magnet；
B) spacing of the first and second magnet be 1mm, second and the 3rd magnet spacing in 5mm, to magnetic field and electricity
Beamlet influence very little can be ignored substantially；
C) distance that the first and second magnet stagger along z-axis depend on choosing can the factor such as scope, for 50MeV~
The 100MeV choosing 35~55mm that can typically stagger is sufficient for demand；
D) second and the 3rd choosing in the middle of magnet can the gap of structure can adjust in a big way, the placement choosing of satisfaction can be tied
The demand of structure damping layer；
E) for 50~100MeV electronics, magnet length is 10cm, and 1MeV electron energy is lost in slit areas, that
It is minimum up to 0.3mm, i.e., 300 μm in the offset of the 4th magnet port of export and zero point, it is big very for laser focal spot
It is many, meet the requirement of head-on collision.
The electronics for being designed to meet different-energy of magnet is separated at second with the 3rd magnet, and energy and position
Relation is corresponded；It disclosure satisfy that outgoing electron and incident electron along the requirement that z-axis offset is 0 simultaneously.
The main electron beam by different-energy of the intrinsic energy resolution rate of four blocks of magnet is by the first and second magnet
Beam spot size after separation is determined.
Electronics choosing energy device is better than 1% for the angle of divergence for the intrinsic energy resolution rate of 1mrad 100MeV electronic beam current.
It can be drawn from basic law of the electronics in electromagnetic field：
A) no matter how much the angle of divergence of electron beam, can dissipate how many, after four blocks of magnet, outgoing electron and incident electron exist
Offset on z directions is zero；
B) motion state of electronics is not changed after four blocks of magnet, the angle of emergence and incidence angle of electronics are equal, when simply
Between before and after exist change；
C) electronics by choosing can structure slit when, required electronics by select can structure slit position and width select
Select, it is not necessary to electronics due to by choosing can structural damping material, there is certain loss, offset may return to originally in energy
After the electrical losses energy for the position for being zero, it is after the third and fourth magnet, and skew quantitative change is big, so its total drift amount exists
The top of center, size depends on the size of off-energy, the energy of electron beam and the parameter of magnet；
D) for 50-100MeV electronics, the length of magnet is 10cm, and 1MeV electron energy is lost in slit areas,
It is so minimum up to 0.3mm, i.e., 300 μm in the port of export of the 4th magnet and the offset of zero point, it is big for laser focal spot
It is a lot, meet the requirement of head-on collision；
E) for slit opening, consider Bunch current, can dissipate and beam energy influence, it should design
Into adjustable pattern, in addition to being adjusted except position, the size of perforate can also should be adjusted, and precision can preferably reach
Below 1mm.
As shown in Fig. 2 considering beam intensity and electron energy resolution ratio, position determines that width is by differentiating by energy
Rate determines that the thickness of choosing energy structure is 2mm, and slit width is 1mm, and material uses Al plates.
Movement locus of the 100MeV electronics in Al plates is simulated by Casino, with reference to stopping power, for 50MeV electricity
Son, Al, 2MeV cm2/ g, so the thickness of aluminium sheet only needs to 0.159cm, i.e. 1.59mm.For 100MeV electronics, Al,
6MeV cm2/ g, so the thickness of aluminium sheet only needs to 0.145cm i.e. 1.45mm.
Consider the whole structure of space requirement and choosing energy device, the present invention does not prepare height of the shielding beyond our demands
Can electronics, and be intended to by translating the position of the 3rd magnet to make the electronic deflection beyond needs go out, specific movement away from
From can be with a distance from the drop-down according to the magnet of energy adjusting the 3rd of electron beam to be abandoned.The electronics of different-energy is by first and the
Offset distance after two magnet can be by electronics in magnetic field moving track calculation obtain.
It is finally noted that, the purpose for publicizing and implementing example is that help further understands the present invention, but this area
Technical staff be appreciated that：Without departing from the spirit and scope of the invention and the appended claims, it is various to replace and repair
It is all possible for changing.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is to weigh
The scope that sharp claim is defined is defined.
Claims (9)
1. a kind of electronics choosing energy device being applied in Laser Driven coda Q values accelerator, it is characterised in that the electronics choosing can device
Including：First to fourth magnet, choosing can structure and shielding constructions；Wherein, the choosing energy structure setting is in the second magnet and the 3rd
Between magnet；Laser coronal region electronics accelerates obtained electron beam to enter the magnetic field of the first magnet along the x-axis direction, sequentially passes through the
The magnetic field of two magnet, the magnetic field for selecting energy structure and the 3rd magnet, from the magnetic field outgoing of the 4th magnet；Put in the afterbody of the 4th magnet
Put shielding construction；The direction in magnetic field is along y-axis, and the magnetic direction of first magnet is identical and big with the magnetic direction of the 4th magnet
Small equal, the second magnet is identical and equal in magnitude with the magnetic direction of the 3rd magnet, and the magnetic field of the first magnet and the second magnetic
The magnetic direction of iron is opposite；Electron beam enters the magnetic field of the first magnet, in the presence of the magnetic field of y directions, electron beam along the x-axis direction
Movement locus shift along the z-axis direction and have an angle with x-axis, the lower electronics of energy deviates bigger, so that electron beam
It is different according to energy, arranged successively along z-axis；The magnetic direction of second magnet and the first magnet are on the contrary, set the magnetic of the second magnet
Size and size so that the angle from the electron beam of the second magnet outgoing and x-axis is 0；Electron beam is along x-axis from the second magnet
Outgoing enter to be selected in can structure, choosing can structure be and the middle slit having parallel to x-axis with certain thickness flat board, it is narrow
The position of seam is located at the position of the z-axis residing for the electronics of required energy, so that the electron beam of required energy passes through choosing energy structure
Slit enters the 3rd magnet；Sequentially pass through after the third and fourth magnet, the offset of the electronics of required energy along z-axis is 0, and
Along the x-axis direction from the 4th magnet outgoing, so that the electronics of required energy be selected out；It is placed on the shielding of the 4th magnet afterbody
Structual shield ray.
2. electronics choosing energy device as claimed in claim 1, it is characterised in that each block of magnet includes yoke and magnet steel, wherein, institute
Yoke is stated for back-shaped framework, a pair of relative inner surfaces are respectively arranged with magnet steel.
3. electronics choosing energy device as claimed in claim 2, it is characterised in that the magnetic pole strength of two magnet steel has gap.
4. electronics choosing energy device as claimed in claim 2, it is characterised in that the side that magnet steel is not provided with yoke is set
Opening is equipped with, if electron beam enters the magnetic field of the first magnet along x-axis positive direction, the magnetic direction of the first magnet is square along y-axis
To then the magnetic field of the second magnet is along y-axis negative direction, and electron beam enters the first magnet, under the influence of a magnetic field, the motion of electron beam
Track shifts along z-axis negative direction and has angle with x-axis, and the lower electronics of energy deviates bigger, is located at z in the first magnet
The yoke of axle negative direction is provided with the first opening, and energy deflects away from magnet less than the electronics of selection threshold value at the first opening；Second
The magnetic direction of magnet and the first magnet, both can be with the contrary, the yoke that the second magnet is located at z-axis positive direction is provided with the second opening
Prevent high energy electron is directly beaten from causing high energy bremsstrahlung in yoke, again can by opening insert shielding material, with
Shield background radiation；If electron beam enters the magnetic field of the first magnet along x-axis positive direction, the magnetic direction of the first magnet is along y-axis
Negative direction, then the magnetic field of the second magnet is along y-axis positive direction, then the yoke for being located at z-axis positive direction in the first magnet is provided with first
Opening, energy deflects away from magnet less than the electronics of selection threshold value at the first opening, and the surface that the second magnet is located at z-axis negative direction is set
It is equipped with the second opening.
5. electronics choosing energy device as claimed in claim 4, it is characterised in that place IP plates in the outside of the opening of the first magnet,
Carry out the monitoring of low-energy electron.
6. electronics choosing energy device as claimed in claim 1, it is characterised in that first magnet and the second magnet, and the 3rd
There is spacing between magnet and the 4th magnet, the spacing is 3mm~10mm.
7. electronics choosing energy device as claimed in claim 1, it is characterised in that the material of the choosing energy structure uses low atomic number
Material.
8. a kind of electronics choosing energy method being applied in Laser Driven coda Q values accelerator, it is characterised in that the electronics selects energy
Method, comprises the following steps：
1) laser coronal region electronics accelerates obtained electron beam to enter the magnetic field of the first magnet along the x-axis direction, sequentially passes through second
The magnetic field of magnet, the magnetic field for selecting energy structure and the 3rd magnet, from the magnetic field outgoing of the 4th magnet；The direction in magnetic field is along y-axis, first
The magnetic direction of magnet is identical and equal in magnitude with the magnetic direction of the 4th magnet, the magnetic direction of the second magnet and the 3rd magnet
It is identical and equal in magnitude, and the magnetic field of the first magnet is opposite with the magnetic direction of the second magnet；
2) electron beam enters the magnetic field of the first magnet, in the presence of the magnetic field of y directions, the movement locus of electron beam along the x-axis direction
Shift along the z-axis direction and have an angle with x-axis, the lower electronics of energy deviates bigger, thus electron beam according to energy not
Together, arranged successively along z-axis；
3) magnetic direction of the second magnet and the first magnet are on the contrary, set the size and size in the magnetic field of the second magnet so that from
The electron beam of second magnet outgoing and the angle of x-axis are 0；
4) electron beam enters to be selected in energy structure along x-axis from the second magnet outgoing, and choosing energy structure is with certain thickness flat board, material
Using the material of low atomic number, and centre has the slit parallel to x-axis, and the position of slit is located at the electronics of required energy
The position of residing z-axis, by adjusting the position of slit and the thickness of choosing energy structure so that the electron beam of required energy is passed through
The slit of choosing energy structure enters the 3rd magnet；
5) sequentially pass through after the third and fourth magnet, the offset of the electronics of required energy along z-axis is 0, and along the x-axis direction from
4th magnet outgoing, so that the electronics of required energy be selected out.
9. electronics choosing energy method as claimed in claim 8, it is characterised in that place IP in the outside of the opening of the first magnet
Plate, carries out the monitoring of low-energy electron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710413281.7A CN107222968A (en) | 2017-06-05 | 2017-06-05 | Can device and choosing energy method applied to the electronics choosing in Laser Driven coda Q values accelerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710413281.7A CN107222968A (en) | 2017-06-05 | 2017-06-05 | Can device and choosing energy method applied to the electronics choosing in Laser Driven coda Q values accelerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107222968A true CN107222968A (en) | 2017-09-29 |
Family
ID=59947972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710413281.7A Pending CN107222968A (en) | 2017-06-05 | 2017-06-05 | Can device and choosing energy method applied to the electronics choosing in Laser Driven coda Q values accelerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107222968A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108112155A (en) * | 2017-12-22 | 2018-06-01 | 上海交通大学 | The coupling device and cascade system of laser wake field acceleration grade |
| CN109814148A (en) * | 2019-03-14 | 2019-05-28 | 中国科学院近代物理研究所 | A kind of high energy quasi-monoenergetic beams ground calibration system of detector |
| CN110887858A (en) * | 2019-12-09 | 2020-03-17 | 北京大学 | Ultrafast high-energy electron probe system based on ultrafast wide-spectrum electron beam |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007019149A2 (en) * | 2005-08-04 | 2007-02-15 | Forced Physics Llc | Enhanced heteroscopic techniques |
| CN101006541A (en) * | 2003-06-02 | 2007-07-25 | 福克斯·彻斯癌症中心 | High energy polyenergetic ion selection systems, ion beam therapy systems, and ion beam treatment centers |
| CN105606488A (en) * | 2016-01-11 | 2016-05-25 | 中国科学院上海光学精密机械研究所 | Gas density measurement system easy to adjust and measurement method thereof |
| CN106356272A (en) * | 2016-09-23 | 2017-01-25 | 中国科学院西安光学精密机械研究所 | Electron diffraction device based on laser plasma wake field acceleration |
-
2017
- 2017-06-05 CN CN201710413281.7A patent/CN107222968A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101006541A (en) * | 2003-06-02 | 2007-07-25 | 福克斯·彻斯癌症中心 | High energy polyenergetic ion selection systems, ion beam therapy systems, and ion beam treatment centers |
| WO2007019149A2 (en) * | 2005-08-04 | 2007-02-15 | Forced Physics Llc | Enhanced heteroscopic techniques |
| CN105606488A (en) * | 2016-01-11 | 2016-05-25 | 中国科学院上海光学精密机械研究所 | Gas density measurement system easy to adjust and measurement method thereof |
| CN106356272A (en) * | 2016-09-23 | 2017-01-25 | 中国科学院西安光学精密机械研究所 | Electron diffraction device based on laser plasma wake field acceleration |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108112155A (en) * | 2017-12-22 | 2018-06-01 | 上海交通大学 | The coupling device and cascade system of laser wake field acceleration grade |
| CN108112155B (en) * | 2017-12-22 | 2019-09-24 | 上海交通大学 | The cascade unit and cascade system of laser wake field acceleration |
| CN109814148A (en) * | 2019-03-14 | 2019-05-28 | 中国科学院近代物理研究所 | A kind of high energy quasi-monoenergetic beams ground calibration system of detector |
| CN109814148B (en) * | 2019-03-14 | 2023-02-03 | 中国科学院近代物理研究所 | High-energy quasi-monoenergetic electron beam ground calibration system of detector |
| CN110887858A (en) * | 2019-12-09 | 2020-03-17 | 北京大学 | Ultrafast high-energy electron probe system based on ultrafast wide-spectrum electron beam |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Tajima et al. | Wakefield acceleration | |
| Scandale et al. | Observation of channeling for 6500 GeV/c protons in the crystal assisted collimation setup for LHC | |
| Fritzler et al. | Emittance measurements of a laser-wakefield-accelerated electron beam | |
| US8264174B2 (en) | Laser acceleration system for generating monoenergetic protons | |
| CN107222968A (en) | Can device and choosing energy method applied to the electronics choosing in Laser Driven coda Q values accelerator | |
| Sakanaka et al. | Recent progress and operational status of the compact ERL at KEK | |
| Kulevoy et al. | ITEP MEVVA ion beam for reactor material investigation | |
| CN110887858A (en) | Ultrafast high-energy electron probe system based on ultrafast wide-spectrum electron beam | |
| Liu et al. | Evolution of laser induced electromagnetic postsolitons in multi-species plasma | |
| US20150228445A1 (en) | Method and apparatus for three dimensional ion implantation | |
| Rieker et al. | A Thomson-type mass and energy spectrometer for characterizing ion energy distributions in a coaxial plasma gun operating in a gas-puff mode | |
| Rimmler et al. | Proton beam multiplexer developments for multi-target operation at the high-brilliance neutron source HBS | |
| CN106898385A (en) | The apparatus and method that electronics gun-type electron-beam enters constraint under a kind of high-intensity magnetic field | |
| Andrei Dudnikov | Cold muonium negative ion production | |
| Haber et al. | Collective space-charge phenomena in the source region | |
| Liu et al. | Laser-Driven Collimated Neutron Sources Based on Kinematic Focusing | |
| Harris et al. | Propagation and detection of RF-modulated electron and X-ray beams in air | |
| EP3385978B1 (en) | Ion filter and method for manufacturing ion filter | |
| Bezuglov et al. | Beam extraction system for industrial electron accelerator ILU-14 | |
| Verra | Electron beam measurements with beam loss monitors in AWAKE | |
| Teng et al. | Beam collimation and energy spectrum compression of laser-accelerated proton beams using solenoid field and RF cavity | |
| Zhao et al. | A new design of Lambertson magnet with true zero field region | |
| Stringer et al. | A Gas Jet Beam Halo Monitor for LINACs | |
| Chen et al. | Resonant interaction of runaway electrons with magnetic field ripple in tokamak plasmas | |
| Zhou et al. | Density effect on proton acceleration from carbon-containing high-density thin foils irradiated by high-intensity laser pulses |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170929 |