CN108922722B - Superconducting cyclotron superconducting magnet exciting method - Google Patents
Superconducting cyclotron superconducting magnet exciting method Download PDFInfo
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- CN108922722B CN108922722B CN201810682304.9A CN201810682304A CN108922722B CN 108922722 B CN108922722 B CN 108922722B CN 201810682304 A CN201810682304 A CN 201810682304A CN 108922722 B CN108922722 B CN 108922722B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/006—Supplying energising or de-energising current; Flux pumps
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Abstract
The invention discloses a kind of superconducting cyclotron superconducting magnet exciting methods, belong to particle convolution acceleration field, solve the problems, such as to be easy quenching for initiation during an excitation.Corresponding exciting current is calculated according to magnetic field strength first；Then excitation repeatedly is carried out to superconducting magnet, the input current of each excitation is followed successively by 4%-5%, 8.5%-9.5%, 20%-25%, 40%-50% and 100% of exciting current.Superconducting cyclotron superconducting magnet exciting method of the present invention is easy to happen the problem of quenching when avoiding excitation to a required magnetic field strength by gradual excitation.When can obtain the attainable limit field strength of superconducting magnet institute by exploratory excitation mode, and can refer to lead subsequent excitation by the limit field strength can an excitation extremely without departing from the magnetic field strength of limit field strength.When carrying out gradual excitation by this method to quench risk small, can avoid the problem that quenching completely when carrying out subsequent excitation referring to this method, to greatly save due to quenching the amount for causing liquid helium to generate consumption.
Description
Technical field
The present invention relates to superconducting cyclotrons to accelerate field, more specifically, it relates to a kind of superconducting cyclotron superconducting magnetic
Body exciting method.
Background technique
Cyclotron is a kind of particle accelerator, so that charged particle is made circumnutation jointly using magnetic field and electric field,
The device accelerated repeatedly in movement through high-frequency electric field, wherein superconducting cyclotron is the core of current medical proton therapy accelerator
Heart equipment.Medical proton therapy accelerator, which can be realized, treats tumour with proton, the Heavy ion beam in microcosmos, is current
The most advanced radiation therapy technology in the world, only individual developed countries grasp and apply the technology.Carrying out superconduction and returning in the country
Revolve the development work of accelerator.
The magnetic field of superconducting cyclotron is mainly provided by superconducting coil, after superconducting coil temperature reaches 4.2K, is needed pair
Superconducting magnet carries out excitation, and the magnetic field of superconducting coil reaches design requirement after excitation.
Reasonable exciting method can quenching to avoid superconducting coil, save the consumption of liquid helium, while reaching superconducting line
The requirement of circle provides required magnetic field for superconducting cyclotron.However existing exciting method is according to required magnetic field
Then electric current is once increased to the corresponding exciting current by the corresponding exciting current of Strength co-mputation.However the critical electricity of superconductor
Stream and the relationship in magnetic field are when magnetic field is bigger, and critical current is smaller.Electric current is smaller conversely speaking, and critical field strength is higher.Work as electricity
Flow it is small to a certain value when, " critical magnetic field " size is no longer influenced by size of current, and is equal to magnetic when current density is equal to zero
Field intensity value.Influence by this current density to critical magnetic field is called the influence of " critical current ".When exciting current increases speed
When spending fast, critical field strength is reduced, and required magnetic field strength very likely breaks through critical magnetic field initiation and quenches, and can be made during quenching
Coil heating leads to liquid helium vaporization consumption, or even burns superconducting coil.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of pair of superconducting magnet to carry out gradual encourage
The exciting method of magnetic avoids subsequent to superconducting magnet progress excitation to verify the limit field strength that the superconducting magnet can reach
When magnetic field strength do not occur lead to the generation for quenching phenomenon beyond critical magnetic field.
To achieve the above object, the present invention provides the following technical scheme that
A kind of superconducting cyclotron superconducting magnet exciting method, in turn includes the following steps:
S1 calculates corresponding exciting current according to magnetic field strength；
S2 carries out excitation to superconducting magnet, and input current is the 4%-5% of exciting current；
S3 carries out excitation to superconducting magnet, and input current is the 8.5%-9.5% of exciting current；
S4 carries out excitation to superconducting magnet, and input current is the 20%-25% of exciting current；
S5 carries out excitation to superconducting magnet, and input current is the 40%-50% of exciting current；
S6 carries out excitation to superconducting magnet, and input current is exciting current.
In the technical scheme, excitation is carried out to superconducting magnet by gradual exciting method, avoids once inputting electricity
Flowing through causes greatly magnetic field strength to quench beyond critical magnetic field；When carrying out excitation by the method to quench risk small, can
The limit field strength that verifying superconducting magnet can reach, provides directive function for subsequent excitation process.
Preferably, step S4 successively include two step by step:
S41 carries out excitation to superconducting magnet, and input current is the 10%-15% of exciting current；
S42 carries out excitation to superconducting magnet, and input current is the 20%-25% of exciting current；
In this preferably technical solution, still superconducting magnet is encouraged by exciting method gradual by a small margin
Magnetic avoids increment of input current is excessive from causing to quench.
Preferably, step S5 successively include two step by step:
S51 carries out excitation to superconducting magnet, and input current is the 20%-25% of exciting current；
S52 carries out excitation to superconducting magnet, and input current is the 40%-50% of exciting current.
In this preferably technical solution, still superconducting magnet is encouraged by exciting method gradual by a small margin
Magnetic avoids increment of input current is excessive from causing to quench.
Preferably, step S6 successively include four step by step:
S61 carries out excitation to superconducting magnet, and input current is the 40%-50% of exciting current；
S62 carries out excitation to superconducting magnet, and input current is the 65%-70% of exciting current；
S63 carries out excitation to superconducting magnet, and input current is the 85%-95% of exciting current；
S64 carries out excitation to superconducting magnet, and input current is exciting current.
In this preferably technical solution, still superconducting magnet is encouraged by exciting method gradual by a small margin
Magnetic avoids increment of input current is excessive from causing to quench.
Preferably, when carrying out excitation to superconducting magnet in each step, input current persistently inputs 0.5h-1h.
In this preferably technical solution, whether have the tendency that quenching to observe by keeping stable electric current to input.
Preferably, it completes after carrying out excitation to superconducting magnet in each step, demagnetization processing is carried out to superconducting magnet.
In this preferably technical solution, the purpose that gradual raising input current carries out excitation is to prove currently defeated
Entering electric current will not cause superconducting magnet to quench, and doing demagnetization processing intent after the completion of each excitation to it again is to avoid this excitation mistake
Journey generates interference to next excitation.Excitation cycles are demagnetized again again alternately by each excitation until input current is equal to exciting current
Afterwards, it was demonstrated that phenomenon will not be quenched when the superconducting magnet can guarantee to reach required magnetic field strength, to form guiding case
Example, next time or to identical superconducting magnet carry out excitation when can an excitation to current magnetic field strength, without having to worry about what is quenched
Problem.
Preferably, when input current reach for the first time 4%-5%, 8.5%-9.5% of exciting current, 20%-25%,
When 40%-50% and 100%, input current persistently inputs 1h.
In this preferably technical solution, when reaching a certain input current for the first time, long period of time is needed to see whether
In the presence of the trend quenched.
Preferably, when input current n-th reaches 20%-25% and 40%-50% of exciting current, input current is held
Continuous input 0.5h；Wherein N is the integer greater than 1.
In this preferably technical solution, second and it is subsequent can be followed because having mark when reaching a certain input current once again,
The time that observation quenches can be shortened.
Preferably, when input current reaches 65%-70% and 85%-95% of exciting current, input current continues defeated
Enter 0.5h.
In this preferably technical solution, when input current levels off to exciting current, observation can be shortened and quench the time.
Preferably, the exciting current is 222A.
In this preferably technical solution, when exciting current is 222A, when corresponding magnetic field strength can meet particle export
Kinetic energy for medical and most of particle Acceleration studies.
In conclusion the invention has the following advantages:
Superconducting cyclotron superconducting magnet exciting method of the present invention avoids an excitation to institute by gradual excitation
It needs to be easy to happen the problem of quenching when magnetic field strength.It is attainable that superconducting magnet institute can be obtained by exploratory excitation mode
Limit field strength, and when can refer to lead subsequent excitation by the limit field strength can an excitation to strong without departing from the magnetic field of limit field strength
Degree.When carrying out gradual excitation by this method to quench risk small, can be avoided completely when carrying out subsequent excitation referring to this method
The problem of quenching, to greatly save due to quenching the amount for causing liquid helium to generate consumption.
Detailed description of the invention
Fig. 1 is the flow diagram of superconducting cyclotron superconducting magnet exciting method of the present invention.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
As shown in Figure 1, the present invention provides a kind of superconducting cyclotron superconducting magnet exciting methods, including walk as follows
It is rapid:
Step S1 is encouraged and is carried out excitation to superconducting magnet using superconducting magnet, and source current is added to 10A from 0A, stablizes
After sixty minutes, using unload can module (demagnetizer, similarly hereinafter) demagnetize, source current falls back on 0A from 10A；
Step S2 carries out excitation to superconducting magnet using superconducting magnet, and source current is added to 20A from 0A, stablizes 60
After minute, demagnetized using energy module is unloaded, source current falls back on 0A from 20A；
Step S3 carries out excitation to superconducting magnet using superconducting magnet, and source current is added to 30A from 0A, stablizes 30
After minute, source current is added to 50A from 30A, stablizes after sixty minutes, is demagnetized using energy module is unloaded, source current is moved back from 50A
To 0A；
Step S4 carries out excitation to superconducting magnet using superconducting magnet, and source current is added to 50A from 0A, stablizes 30
After minute, source current is added to 100A from 50A, stablize after sixty minutes, using unload can module demagnetize, source current is from 100A
Fall back on 0A；
Step S5 carries out excitation to superconducting magnet using superconducting magnet, and source current is added to 100A from 0A, stablizes 30
After minute, source current is added to 150A from 100A, and after stablizing 30 minutes, source current is added to 200A from 150A, stablizes 30 minutes
Afterwards, source current is added to 222A from 200A, stablizes after sixty minutes, completes the excitation to superconducting magnet.
After completing excitation according to above-mentioned steps, demagnetize again by demagnetizer to superconducting magnet, next excitation again
When, then source current disposably can be added to from 0A by 222A by superconducting magnet and complete excitation.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (6)
1. a kind of superconducting cyclotron superconducting magnet exciting method, which is characterized in that in turn include the following steps:
S1 calculates corresponding exciting current according to magnetic field strength；
S2 carries out excitation to superconducting magnet, and input current is the 4%-5% of exciting current；
S3 carries out excitation to superconducting magnet, and input current is the 8.5%-9.5% of exciting current；
S4 carries out excitation to superconducting magnet, and input current is the 20%-25% of exciting current；
S5 carries out excitation to superconducting magnet, and input current is the 40%-50% of exciting current；
S6 carries out excitation to superconducting magnet, and input current is exciting current；
Step S2, the input current in step S3, step S4, step S5 and step S6 persistently inputs 1h；In step S2, step
After carrying out excitation to superconducting magnet in S3, step S4, step S5 and step S6, demagnetization processing is carried out to superconducting magnet.
2. superconducting cyclotron superconducting magnet exciting method according to claim 1, which is characterized in that in step S3 and
Further include step by step between step S4:
S41 carries out excitation to superconducting magnet, and input current is the 10%-15% of exciting current.
3. superconducting cyclotron superconducting magnet exciting method according to claim 1, which is characterized in that in step S4 and
Further include step by step between step S5:
S51 carries out excitation to superconducting magnet, and input current is the 20%-25% of exciting current.
4. superconducting cyclotron superconducting magnet exciting method according to claim 1, which is characterized in that in step S5 and
Between step S6 also successively include three step by step:
S61 carries out excitation to superconducting magnet, and input current is the 40%-50% of exciting current；
S62 carries out excitation to superconducting magnet, and input current is the 65%-70% of exciting current；
S63 carries out excitation to superconducting magnet, and input current is the 85%-95% of exciting current.
5. the superconducting cyclotron superconducting magnet exciting method according to any one of claim 2-4, which is characterized in that
Each step by step in superconducting magnet carry out excitation when, input current persistently inputs 0.5h.
6. superconducting cyclotron superconducting magnet exciting method according to claim 1, which is characterized in that the excitation electricity
Stream is 222A.
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