CN108566720B - A kind of selection of particle accelerator energy and analysis system - Google Patents
A kind of selection of particle accelerator energy and analysis system Download PDFInfo
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- CN108566720B CN108566720B CN201810191469.6A CN201810191469A CN108566720B CN 108566720 B CN108566720 B CN 108566720B CN 201810191469 A CN201810191469 A CN 201810191469A CN 108566720 B CN108566720 B CN 108566720B
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/29—Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation
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- 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
- H05H7/12—Arrangements for varying final energy of beam
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- 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
- H05H2007/004—Arrangements for beam delivery or irradiation for modifying beam energy, e.g. spread out Bragg peak devices
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Abstract
The present invention relates to a kind of selections of particle accelerator energy and analysis system, the system to be made of a degrader, two energy spectrometer slits, two pieces of dipolar magnets, several quadrupole electromagnets and a beam intensity detector.Two energy spectrometer slits are located at first piece of dipolar magnet two sides, and by adjusting the intensity of quadrupole electromagnet, when enabling particle by span line between two energy spectrometer slits, change in location is unrelated with the initial scattered angle of particle；Two pieces of dipolar magnets are symmetrically placed in 45 degree；Degrader has several gears, can be adjusted to projectile energy using required range.Energy spectrometer slit width is adjustable, and the accurate selection of energy can be realized by adjusting the width of two energy spectrometer slits.The selection of particular energy and the dynamic regulation of analysis and energy resolution and beam intensity are realized the present invention is based on fixed energy accelerator, accurately adjustable particle accelerator field has a wide range of applications needing energy.
Description
Technical field
The invention belongs to particle accelerator technical fields, and in particular to energy selection and the analysis of a kind of particle accelerator be
System.
Background technique
In particle accelerator technical field, the particle energy that cyclotron and linear accelerator are drawn is usually fixed
, synchrotron often also has a minimum extraction energy, and the grain drawn is often desirable in Physical Experiment or other application
Sub- energy and beam intensity are adjustable, and power dissipation wants as small as possible, can accuracy of measurement it is as high as possible.
To change particle energy, frequently with it is a kind of realized with matter interaction off-energy principle using particle it is passive
Drop can device.When particle is by this passive drop energy device, although realizing energy adjustment, many beam parameters can also become
Difference.For example, the intensity of line can reduce, the power dissipation of line be will increase, and the emittance of line also will increase.Work as user
When (in such as Physical Experiment or radiation treatment application) has very high energy required precision to line, to adjust these lines ginseng
Number especially controls the dispersibility of beam energy, realizes the accurate selection of energy, need to establish a kind of beam to meet user's needs
Stream energy selection and analysis system.
National inventing patent CN106211535A proposes the dress of proton beam emittance after one kind effectively control degrader
It sets and method, the device is made of two circular hole collimators and a rotating disc type degrader, advantage is that structure is compact, but
Due to collimation bore dia be it is fixed, can not energy dispersive needed for flexible modulation.
National inventing patent CN107018619A proposes a kind of compact proton beam energy and energy spread control structure,
The core of the structure is an energy selection slit, by the pore size control energy dispersive for adjusting slit.The disadvantages of this method
It is not control by the beam spot lateral dimension of degrader, can not determines the beam width at slit, and entering should
The particle of structure, which dissipates angle, also will affect the beam spot lateral dimension at slit, therefore this method can not be obtained directly by slit width
Required energy resolution out.
Summary of the invention
The purpose of the present invention is to provide an energy spectrometer precision, accurately adjustable particle accelerator energy selects and divides
Analysis system.
Beam energy analysis system is usually made of elements such as energy spectrometer slit and analysis magnets.It is managed according to beam transfer
By particle is from a location transmission to another position, the positional relationship of horizontal direction are as follows:
x2=R11x1+R12x′1+Dδ (1)
Wherein, wherein x1And x2It is the lateral coordinates of particle at two lengthwise positions, x1' it is that particle exists at first position
Scattered angle in horizontal direction (X-direction), R11And R12For from first position to 2 × 2 transmission matrixs second position
Element, D are Dispersion Function (i.e. R in 6 × 6 transmission matrixs of first position to second position16), δ be particle relatively in
The momentum spread (being corresponded with power dissipation) of heart energy.
If placing two energy spectrometer slits in above-mentioned two position, and by several between two energy spectrometer slits of optimization
The intensity of block quadrupole electromagnet and position, so that R12=0, to eliminate the influence for dissipating angle.At this point, the resolution ratio of energy selection system
δ can be write as:
In above formula, R11And D depends on the position and intensity of quadrupole iron and two pole iron between two slits, after design determines
It is usually constant.x1Depending on the width of first slit, x2Width depending on second slit.Therefore, as long as adjusting two
The width of a slit can directly obtain required energy resolution.Generally by fixed x in actually adjusting beam work1, adjust
Save x2It realizes.
In order to improve the resolution ratio (δ i.e. in reduction above formula) of energy analysis system, on the one hand need to reduce the second energy
The width of slit is analyzed, the second energy spectrometer slit should be placed in the biggish place of dispersion as far as possible by still further aspect.But simultaneously
It will be noted that slit width is smaller, the particle lost after slit will be more.Therefore, lead to after energy spectrometer slit
Often need to connect a beam intensity detector.It, should be in view of application be for beam energy dispersion degree in selection slit width
Requirement, it is considered however that requirement of the application for Bunch current is sought to balance between.
The present invention increases an energy spectrometer slit on the basis of national inventing patent CN107018619A, by two energy
Amount analysis slit is respectively placed in first piece of dipolar magnet two sides.First energy spectrometer slit be located at degrader after, first piece
Before dipolar magnet, for limiting beam spot lateral dimension；Second energy spectrometer slit is located between two pieces of dipolar magnets, passes through
It adjusts second energy spectrometer slit width and selects the particle energy dispersion degree passed through.
The technical solution of the invention is as follows provides a kind of selection of particle accelerator energy and analysis system, special character
It is: including by the sequentially connected degrader of vacuum line pipeline, the first energy spectrometer slit, first piece of dipolar magnet, the
Two energy spectrometer slits, beam intensity detector and second piece of dipolar magnet；
It further include being located at the first energy spectrometer slit and first piece of dipolar magnet input terminal, first piece of dipolar magnet output end
If quadrupole electromagnet between the second energy spectrometer slit and between beam intensity detector and second piece of dipolar magnet
Dry block quadrupole electromagnet；
Above-mentioned first piece of dipolar magnet and second piece of dipolar magnet are symmetrical arranged in 45 °；
Above-mentioned first energy spectrometer slit and the second energy spectrometer slit are broad-adjustable line slit, the drop energy
Device is used for the energy adjustment of accelerator outgoing particle to setting range；
Above-mentioned first energy spectrometer slit and the second energy spectrometer slit are broad-adjustable line slit, for limiting
By the quantity of the first energy spectrometer slit and the particle of the second energy spectrometer slit, dissipate angle and transverse width；
Above-mentioned quadrupole electromagnet adjustment Particles Moving is using central orbit as axle center focusing or defocusing；
Above-mentioned first piece of dipolar magnet and second piece of dipolar magnet are used to charged particle deflecting certain angle, and enable
Different particles is measured horizontally to separate because of deflection radius difference；
Above-mentioned beam intensity detector with measurement accelerator intensity.
By adjusting the intensity of several quadrupole electromagnets of dipolar magnet upstream and downstream, 2 × 2 between two energy spectrometer slits are enabled
R in transmission matrix R12=0, when particle passes through the span line between two energy spectrometer slits at this time, change in location and particle
It is initial dissipate angle it is unrelated, be only dependent upon the initial position and energy dispersive of incoming particle.Two energy spectrometer slits distinguish position
In the two sides of first piece of dipolar magnet.Wherein, after first energy spectrometer slit is located at degrader, first piece of dipolar magnet it
Before, for limiting beam spot lateral dimension.Second energy spectrometer slit is located between two pieces of dipolar magnets, by adjusting second
The particle energy dispersion degree passed through may be selected in the width of energy spectrometer slit, realizes the accurate selection of energy.
Preferably, above-mentioned degrader includes that rotary drive mechanism, vacuum cavity and the drop inside vacuum cavity can turn
Disk；
The drive shaft of rotary drive mechanism passes through vacuum cavity and connect with drop energy turntable；
Above-mentioned drop energy turntable includes rotating disk and the different several drop energy blocks of thickness in rotating disk, and each drop energy block is located at
On same circumference；
Above-mentioned vacuum cavity be equipped with import beam current tube and outlet beam current tube, accelerator outgoing particle beam from into
Mouth beam current tube enters vacuum cavity, after passing perpendicularly through the drop energy block on drop energy turntable, passes through outlet beam current tube outgoing；
Above-mentioned rotary drive mechanism includes servomotor, gear reducer and magnetic fluid seal driving device；
The output shaft of servo motor connects the input shaft of speed reducer, and the output shaft of speed reducer passes through shaft coupling and magnet fluid sealing
The center axis connection of transmission device, the central axis of magnetic fluid seal driving device pass through vacuum cavity and connect with drop energy turntable；Magnetic
Fluid-tight transmission is to import rotary motion in vacuum chamber and realize vacuum sealing.
Preferably, it is provided with N number of hole location along same circumference in rotating disk, N-1 drop energy block is removably solid respectively
Due in hole location.
Preferably, above-mentioned vacuum cavity is equipped with replacement window, observation window and vacuum lead, replacement window and vacuum cavity method
Orchid connection；
Above-mentioned degrader further includes support base, and vacuum cavity is located in support base；Vacuum cavity is cylindrical cavity, end
Face is detachable.
Preferably, the first energy spectrometer slit and the second energy spectrometer slit include vacuum chamber, are located at vacuum chamber
Interior two pieces of left and right graphite block and two sets of driving mechanisms outside vacuum chamber；
The front and back end of above-mentioned vacuum chamber and vacuum line pipeline connection；
Two sets of driving mechanisms include motor, transmission mechanism and pushing ram, above-mentioned pushing ram pass through vacuum chamber respectively with
The graphite block connection of two pieces of left and right；The two pieces of graphite blocks in left and right are in beam direction front-back staggered；Motor passes through respective transmission mechanism band
Dynamic pushing ram, so that two pieces of left and right graphite block is moved along the direction vertical with line；
Signal lead-out wire is connected separately on the two pieces of graphite blocks in left and right, two bars lead-out wires are drawn across vacuum chamber；
Preferably, above-mentioned vacuum chamber includes longitudinal tubular vacuum cavity, two sections of transversal tubular vacuum cavities and two sections of waves
Line pipe；
The both ends of above-mentioned longitudinal tubular vacuum cavity are connected to vacuum beam current tube；
One end of two sections of transversal tubular vacuum cavities is separately fixed at the tube wall relative position of longitudinal tubular vacuum cavity,
And it is connected with longitudinal tubular vacuum cavity；The other end of two sections of transversal tubular vacuum cavities, which is provided with, so that pushing ram is passed through
Aperture；
One end of two sections of bellowss connect with two sections of transversal tubular vacuum cavities respectively and passes through on transversal tubular cavity
Aperture is connected to transversal tubular cavity, and the other end of two sections of bellowss is sealed and connect with transmission mechanism.
Preferably, the first energy spectrometer slit and the second energy spectrometer slit further include positioned at graphite block and pushing ram it
Between the collets of left and right two；Graphite block and collets are located in transversal tubular cavity, and one end of pushing ram is connect with collets,
The other end is fixed in bellows after the aperture of transversal tubular vacuum cavity.
Preferably, above-mentioned driving mechanism further includes pedestal, and above-mentioned transmission mechanism and motor are fixed on the base；Bellows weldering
It connects on transversal tubular vacuum cavity.
Preferably, above-mentioned longitudinal tubular vacuum cavity is equipped with observation window.
Preferably, graphite block thickness 10mm, insulating bulk material are ceramics；The material of drop energy block is graphite or aluminium；Rotating disk
Material is stainless steel.
The beneficial effects of the present invention are:
1, energy spectrometer precision of the present invention is adjustable, and energy spectrometer precision and second narrow can be obtained by theoretical calculation
Relationship between slit width degree brings convenience for line debugging；
2, the configuration of the present invention is simple, easy to adjust, energy spectrometer precision is high, has expanded answering for fixed energy accelerator significantly
Use scope.
Detailed description of the invention
Fig. 1 is the one of embodiment system schematic of the present invention；
Fig. 2 is degrader structural schematic diagram in the embodiment of the present invention；
Fig. 3 is energy spectrometer slit arrangement structural schematic diagram in the embodiment of the present invention；
Fig. 4 is the beam optics schematic diagram of energy spectrometer section in the embodiment of the present invention.
Appended drawing reference in figure are as follows: 1- degrader, 2- the first energy spectrometer slit, first group of quadrupole electromagnet unit of 3-, 4-
One piece of dipolar magnet, second group of quadrupole electromagnet unit of 5-, 6- the second energy spectrometer slit, 7- beam intensity detector, 8- third
Group quadrupole electromagnet unit, second piece of dipolar magnet of 9-；
11- servo motor, 12- speed reducer, 13- shaft coupling, 14- magnetic fluid seal driving device, 15- central axis, 16- rotation
Turntable, 17- drop energy block, 18- import beam current tube, 19- export beam current tube, 110- vacuum lead, and 111- replaces window, 112-
Watch window, 113- support base, 114- vacuum cavity；
21- longitudinal tubular vacuum cavity, the left graphite block of 22-, the right graphite block of 23-, the left collets of 24-, the right collets of 25-,
The left pushing ram of 26-, the right pushing ram of 27-, the left bellows of 28-, the right bellows of 29-, 210- left support seat, 211- right support seat,
212- Left Drive mechanism, the right transmission mechanism of 213-, the left motor of 214-, the right motor of 215-.
Specific embodiment
It is clear to be more clear the object, technical solutions and advantages of the present invention, with reference to the accompanying drawings and examples to this
Invention is further elaborated.
It will be seen from figure 1 that by vacuum line pipeline to be sequentially connected degrader 1, the first energy spectrometer narrow for the present embodiment
Stitch 2, first groups of 3, first pieces of quadrupole electromagnet unit, 4, second groups of dipolar magnet quadrupole electromagnet units 5, second energy spectrometer slits
6, beam intensity detector 7, third group quadrupole electromagnet unit 8 and second piece of dipolar magnet 9, first group of quadrupole electromagnet unit 3,
Two groups of quadrupole electromagnet units 5, third group quadrupole electromagnet unit 8 include two quadrupole electromagnets.
Figure it is seen that degrader 1 mainly includes rotary drive mechanism, vacuum cavity 114 and position in the present embodiment
Drop energy turntable inside vacuum cavity 114；
Rotary drive mechanism includes servo motor 11, speed reducer 12 and magnetic fluid seal driving device 14；
The input shaft of speed reducer 12 and servo motor 11 export axis connection, the output shaft of speed reducer 12 by shaft coupling 13 with
The central axis 15 of magnetic fluid seal driving device 14 connects, and the central axis 15 of magnetic fluid seal driving device 14 passes through vacuum chamber
114 bodies are connect with drop energy turntable；Magnetic fluid seal driving device 14 is to import rotary motion in vacuum chamber and realize vacuum sealing.
Servo motor 11 exports rotary motion, is realized by speed reducer 12 and slows down and turn to, connect by shaft coupling 13 with central axis 15, from
And rotating disk 16 is driven to rotate.
Drop can turntable include rotating disk 16 and drop can block 17, be provided with 24 hole locations along same circumference in rotating disk 16, one
Hole location does not install drop energy block 17, and other hole locations are respectively provided with 23 different-thickness, dismountable graphite drop can block；
Vacuum cavity 114 be cylindrical cavity, which is provided with import beam current tube 18 and outlet beam current tube 19, line from into
Mouth beam current tube 18 enters vacuum cavity 114, after passing perpendicularly through the drop energy block 17 on drop energy turntable, passes through and exports beam current tube 19
Outgoing.Vacuum cavity 114 is fixed in support base 113, and replacement window 111, watch window 112 are additionally provided on vacuum cavity 114
And vacuum lead 110 can replace 111 flange of window by opening, replace required when needing repairing or replacing drop energy block 17
One or more drop energy block 17, without being dismantled and being reinstalled to whole device.
From figure 3, it can be seen that in the present embodiment energy spectrometer slit mainly by a set of vacuum system, two sets of driving mechanisms,
Two collets (left collets 24, right collets 25) and two graphite block (left graphite block 22, right graphite block 23) compositions.
Vacuum system includes 21, two sections of transversal tubular vacuum cavities of longitudinal tubular vacuum cavity and is respectively welded at two sections of cross
Two sections of bellowss on tubular vacuum cavity, respectively left bellows 28 and right bellows 29；Longitudinal tubular vacuum cavity
Both ends are connected to vacuum beam current tube, and line passes through among longitudinal tubular vacuum cavity 21；Two sections of transversal tubular vacuum cavities
One end be separately fixed at the tube wall relative position of longitudinal tubular vacuum cavity 21, and be connected with longitudinal tubular vacuum cavity 21
It is logical；Vacuum seal of the bellows as straight line driving mechanism, one end are connect simultaneously with two sections of transversal tubular vacuum cavities respectively
It is connected to by the aperture on transversal tubular cavity with transversal tubular cavity, the other end sealing of two sections of bellowss.
Driving mechanism includes two support bases (left support seat 210, right support seat 211), two motors (left motor 214, the right sides
Motor 215), two sets of transmission mechanism (Left Drive mechanism 212, right transmission mechanism 213) and two pushing rams (left pushing ram 26, it is right
Pushing ram 27).
Graphite block and collets are located in transversal tubular cavity, and motor and transmission mechanism are mounted on longitudinal tubular vacuum cavity
On the support base of 21 two sides, one end of pushing ram is connect with collets, and the other end is fixed on after passing through transversal tubular vacuum cavity
In bellows.Motor drives pushing ram and graphite block to move horizontally by transmission mechanism, and the direction of motion is vertical with beam direction.
Slit width can be detected by observation window, driving mechanism repetitive positioning accuracy is higher than 0.01mm, ensure that the height of slit width
Precision is adjustable.
Graphite block thickness 10mm, connection signal line on graphite block, is obtained by the electric current in extraction electrode measurement signal line
Beam loss situation at slit, two graphite blocks form slit in vertical beam direction and avoid in beam direction front-back staggered
Graphite block collides when being advanced into vacuum line tube hub simultaneously.Insulating bulk material is ceramics, is mounted on pushing ram and graphite
Between block, for connecting graphite block and realizing the insulation between graphite block and integral device.
In line debugging, first with degrader 1 by the energy adjustment of incoming particle to using required range；Pass through
The lateral dimension of one energy spectrometer slit 2 restriction beam spot；By several quadrupole electromagnets for adjusting first piece of 4 upstream and downstream of dipolar magnet
Intensity, enable the R in 2 × 2 transmission matrix R between two energy spectrometer slits12=0, particle passes through two energy spectrometers at this time
When span line between slit, the initial of change in location and particle dissipates that angle is unrelated, be only dependent upon incoming particle initial position and
Energy dispersive；It is again the particle energy dispersion degree that may be selected to pass through by adjusting the width of the second energy spectrometer slit 6；Finally
Pass through the population of the second energy spectrometer slit 6 by the monitoring of beam intensity detector 7.
In the present embodiment, accelerator can directly lead out 60MeV proton beam, and 60MeV energy below is dropped using degrader
Can mode realize.Fig. 4 gives the beam optics function distribution of energy spectrometer section in embodiment, and wherein black curve is X
Line envelope on direction, dotted line R12And R16(i.e. D).At this time in the optical parameter of energy spectrometer slit location line are as follows: first
X=4.128mm at slit, Y=9.398mm；X=4.346mm, Y=4.150mm at second slit；Span line transmission matrix: R11
=-0.99, R12=0, R16=1.137m.
Table 1 give drop is dropped to needed for different-energy by the proton that theoretical calculation obtains can be after the thickness and drop energy of material
It can dissipate, and calculate when the energy resolution of needs is 1%, pass through the particle ratio of the energy analysis system.If keeping
Two slit widths are equal, and two slit widths are 5.7mm at this time.Table 2, which gives, does not use degrader, directly leads out 60MeV matter
Sub (assuming that can dissipate is 1%), is designed using two slit equal in widths, the pass between slit width and energy resolution and beam loss
System.When can be to other energy using degrader drop, similar corresponding relationship can also be provided.It can be seen that using the present invention
In method, by adjust slit width, theoretically available slit width, energy resolution and lost particle ratio it
Between corresponding relationship, user can select between according to requirement of the application to energy resolution and beam intensity.?
In practical debugging process, the correctness of above-mentioned relation can also be verified by the beam intensity detector after the second slit.
1 60MeV proton of table, which drops to drop needed for different-energy, power dissipation and to require energy after the thickness of material, drop energy
The particle ratio that amount resolution ratio passes through when being 1%
| Beam energy (MeV) | Drop can block thickness (mm) | Power dissipation (MeV) | Pass through particle ratio (%) |
| 10 | 13.03 | 4.1 | < 3.5 |
| 15 | 12.45 | 3 | < 6.7 |
| 20 | 11.70 | 2.4 | < 10 |
When the extraction particle energy of table 2 is that energy does not drop in 60MeV, the corresponding energy resolution of energy spectrometer slit width and loss
Particle ratio
| Slit width (mm) | Energy resolution (%) | Lost particle ratio |
| 1 | 0.176 | 93.2% |
| 2 | 0.352 | 72.8% |
| 3 | 0.52 | 38.8% |
Energy spectrometer precision of the present invention is adjustable, and can theoretically provide energy spectrometer precision, lost particle ratio
Corresponding relationship between slit width, facilitates line to debug.
Various changes and modifications can be made to the invention without departing from essence of the invention by obvious those skilled in the art
Mind and range.If in this way, belonging to the model of the claims in the present invention and its equivalent technology to these modifications and changes of the present invention
Within enclosing, then industry of the present invention is intended to encompass including these modification and variations.
Claims (10)
1. a kind of particle accelerator energy selection and analysis system, it is characterised in that: including successively being connected by vacuum line pipeline
The degrader that connects, the first energy spectrometer slit, first piece of dipolar magnet, the second energy spectrometer slit, beam intensity detector and
Second piece of dipolar magnet；
It further include positioned at the first energy spectrometer slit and first piece of dipolar magnet input terminal, first piece of dipolar magnet output end and the
Quadrupole electromagnet between two energy spectrometer slits and the quadrupole magnetic between beam intensity detector and second piece of dipolar magnet
Iron；
First piece of dipolar magnet and second piece of dipolar magnet are symmetrical arranged in 45 °；
The first energy spectrometer slit and the second energy spectrometer slit are broad-adjustable line slit；
The R in 2 × 2 transmission matrix R between first energy spectrometer slit and the second energy spectrometer slit12=0.
2. particle accelerator energy selection according to claim 1 and analysis system, it is characterised in that: the degrader packet
Include rotary drive mechanism, vacuum cavity and the drop energy turntable inside vacuum cavity；
The drive shaft of rotary drive mechanism passes through vacuum cavity and connect with drop energy turntable；
The drop energy turntable includes rotating disk and the different several drop energy blocks of thickness in rotating disk, and each drop energy block is located at same
On circumference；
The vacuum cavity is equipped with import beam current tube and outlet beam current tube, and the line of accelerator outgoing is from import line pipe
Road enters vacuum cavity, after passing perpendicularly through the drop energy block on drop energy turntable, passes through outlet beam current tube outgoing；
The rotary drive mechanism includes servomotor, gear reducer and magnetic fluid seal driving device；
The output shaft of servo motor connects the input shaft of speed reducer, and the output shaft of speed reducer passes through shaft coupling and magnetic fluid seal driving
The center axis connection of device, the central axis of magnetic fluid seal driving device pass through vacuum cavity and connect with drop energy turntable；Magnetic fluid
Sealed gearing device is to import rotary motion in vacuum chamber and realize vacuum sealing.
3. particle accelerator energy selection according to claim 2 and analysis system, it is characterised in that: along same in rotating disk
One circumference is provided with N number of hole location, and N-1 drop energy block is removably individually fixed in hole location.
4. particle accelerator energy selection according to claim 3 and analysis system, it is characterised in that: the vacuum cavity
It is equipped with replacement window, observation window and vacuum lead, replacement window and vacuum cavity flanged joint；
The degrader further includes support base, and vacuum cavity is located in support base；Vacuum cavity is cylindrical cavity, and end face can
Disassembly.
5. particle accelerator energy selection according to claim 1 to 4 and analysis system, it is characterised in that: the first energy
Amount analysis slit and the second energy spectrometer slit include vacuum chamber, are located at vacuum chamber two pieces of indoor left and right graphite block and position
In two sets of driving mechanisms outside vacuum chamber；
The front and back end of the vacuum chamber and vacuum line pipeline connection；
Two sets of driving mechanisms include motor, transmission mechanism and pushing ram, the pushing ram pass through vacuum chamber respectively with left and right
Two pieces of graphite block connections；The two pieces of graphite blocks in left and right are in beam direction front-back staggered；Motor is pushed away by the drive of respective transmission mechanism
Into bar, so that two pieces of left and right graphite block is moved along the direction vertical with line；
Signal lead-out wire is connected separately on the two pieces of graphite blocks in left and right, two bars lead-out wires are drawn across vacuum chamber.
6. particle accelerator energy selection according to claim 5 and analysis system, it is characterised in that: the vacuum chamber
Including longitudinal tubular vacuum cavity, two sections of transversal tubular vacuum cavities and two sections of bellowss；
The both ends of the longitudinal tubular vacuum cavity are connected to vacuum beam current tube；
One end of two sections of transversal tubular vacuum cavities is separately fixed at the tube wall relative position of longitudinal tubular vacuum cavity, and with
Longitudinal tubular vacuum cavity is connected；The other end of two sections of transversal tubular vacuum cavities is provided with opening that pushing ram can be made to pass through
Hole；
One end of two sections of bellowss connect with two sections of transversal tubular vacuum cavities respectively and passes through the aperture on transversal tubular cavity
It is connected to transversal tubular cavity, the other end of two sections of bellowss is sealed and connect with transmission mechanism.
7. particle accelerator energy selection according to claim 6 and analysis system, it is characterised in that: the first energy spectrometer
Slit and the second energy spectrometer slit further include the collets of left and right two between graphite block and pushing ram；Graphite block and
Collets are located in transversal tubular cavity, and one end of pushing ram is connect with collets, and the other end passes through transversal tubular vacuum cavity
Aperture after be fixed in bellows.
8. particle accelerator energy selection according to claim 7 and analysis system, it is characterised in that: the driving mechanism
It further include pedestal, the transmission mechanism and motor are fixed on the base；Bellows-welding is on transversal tubular vacuum cavity.
9. particle accelerator energy selection according to claim 8 and analysis system, it is characterised in that: the longitudinal tubular
Vacuum cavity is equipped with observation window.
10. particle accelerator energy selection according to claim 9 and analysis system, it is characterised in that: graphite block is thick
10mm, insulating bulk material are ceramics；The material of drop energy block is graphite or aluminium；The material of rotating disk is stainless steel.
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| 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 |
| CN114158175B (en) * | 2021-11-26 | 2022-11-15 | 中山大学 | Chicane system in high-current electron linear accelerator |
| CN115006747B (en) * | 2022-08-09 | 2022-10-25 | 合肥中科离子医学技术装备有限公司 | Superconducting rotating gantry and proton treatment apparatus |
| CN115413105B (en) * | 2022-09-19 | 2023-05-12 | 中国科学院近代物理研究所 | 360 capable of realizing multi-terminal distribution o Superconductive rotary harness |
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| US4017403A (en) * | 1974-07-31 | 1977-04-12 | United Kingdom Atomic Energy Authority | Ion beam separators |
| DE4315348A1 (en) * | 1993-05-08 | 1994-11-10 | Josef Dr Sellmair | Device for extraction and initial acceleration of charged particles from a plasma |
| EP2128885A1 (en) * | 2008-05-26 | 2009-12-02 | FEI Company | Charged particle source with integrated energy filter |
| CN103207405B (en) * | 2013-05-03 | 2014-12-24 | 中国科学院上海应用物理研究所 | Beam cluster parameter measuring system for low-energy heavy ions and frequency resonance energy selection energy measuring method |
| CN106404882B (en) * | 2016-08-31 | 2019-08-23 | 兰州空间技术物理研究所 | A kind of magnetic deflection mass spectrometer based on cylindricality analysis of electric field device |
| CN107018619B (en) * | 2017-05-12 | 2018-05-11 | 合肥中科离子医学技术装备有限公司 | A kind of compact proton beam energy and energy spread control structure |
| CN107635348B (en) * | 2017-09-25 | 2018-08-14 | 合肥中科离子医学技术装备有限公司 | A kind of superconduction proton device energy selection system and its implementation |
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