CN106098291B - The quick demagnetizing method of the big energy storage superconducting coil of cyclotron - Google Patents
The quick demagnetizing method of the big energy storage superconducting coil of cyclotron Download PDFInfo
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- CN106098291B CN106098291B CN201610617024.0A CN201610617024A CN106098291B CN 106098291 B CN106098291 B CN 106098291B CN 201610617024 A CN201610617024 A CN 201610617024A CN 106098291 B CN106098291 B CN 106098291B
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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
- H01F6/003—Methods and means for discharging superconductive storage
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/006—Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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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
- H05H13/00—Magnetic resonance accelerators; Cyclotrons
- H05H13/005—Cyclotrons
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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
- H05H7/04—Magnet systems, e.g. undulators, wigglers; Energisation thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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- Spectroscopy & Molecular Physics (AREA)
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Abstract
The present invention relates to a kind of quick demagnetizing method of the big energy storage superconducting coil of cyclotron, and energy diode group is let out by the quick demagnetization in parallel with superconduction magnet exciting coil so that the energy of the superconduction magnet exciting coil storage of superconducting cyclotron is discharged into normal temperature.This method causes superconducting cyclotron to use the probability for quenching protected mode, reducing the damage of superconducting cyclotron superconduction magnet exciting coil based on interior protection and outer protection.
Description
Technical field
The invention belongs to cyclotron designing technique, and in particular to a kind of big energy storage superconducting coil of cyclotron it is fast
Fast demagnetizing method.
Background technology
Superconduction magnet exciting coil is by superconductor (such as NbTi, Nb3The high temperature such as the low temperature superconducting materials such as Sn and BSCCO, YBCO surpasses
Lead material) made of the stranded cable coiling that is woven into of superconducting line or superconducting line form.It is typically used to provide conventional normal temperature magnet exciting coil
The high current that can not provide, high-intensity magnetic field.Superconduction magnet exciting coil is only (at least below facing for corresponding superconductor under extremely low temperature
Boundary's temperature) superconducting state could be maintained.Now, superconduction magnet exciting coil impedance itself is close to zero, no joule heat, the electricity at coil both ends
Pressure drop is very low, and superconduction magnet exciting coil possesses very big current load ability, and (its critical current is more several greatly than conventional copper conductor
The individual order of magnitude).But when because some reasons cause the temperature of superconduction magnet exciting coil to exceed critical-temperature when, superconducting line will from surpass
Lead state and be converted into non-superconducting state, if superconduction magnet exciting coil does not quench protection system, now high current flows through non-superconducting state
Superconduction magnet exciting coil can cause coil to produce a large amount of Joule heats, and coil is brought rapidly up and damaged；Voltage simultaneously in coil is rapid
Rise, there is the risk of breakdown coil covering.Therefore, generally all superconduction magnet exciting coil can be protected using protection system is quenched.
In most important application-superconduction nmr magnet (Superconducting MRI of superconduction magnet exciting coil
Magnet in), because nmr magnet is typically all to be run without power supply, therefore superconduction magnet exciting coil therein uses interior guarantor
The mode of shield protects superconduction magnet exciting coil (referring to Yi Li, Qiuliang Wang, Shunzhong Chen, Quench
Simulation for 9.4T MRI Superconducting Magnet, Journal of Physics：Conference
Series 507(2014)032054.).I.e. generally use is placed on cryostat low-temperature end, back-to-back cold diode
(back-to-back cold diodes) is in parallel with superconduction magnet exciting coil, bypasses the coil quenched, when limiting coil quenches
Voltage raises；The pre-buried heater in superconduction magnet exciting coil coiling simultaneously, drives heater to heat using voltage when quenching
The part that superconduction magnet exciting coil does not quench so that whole magnet uniformly quenches, and reduces the maximum temperaturerise in magnet, reaches protection magnetic
The purpose of body.
In presently disclosed superconducting cyclotron superconducting magnet, the usual charged work of superconduction magnet exciting coil, merely
Can not meet to require using interior protection, generally require it is special quench detection system detection and quench signal, for deenergization, together
When with the outer protective resistance for being operated in room temperature protect superconduction magnet exciting coil (referring to K.Pieterman, C.Commeaux,
J.A.M.Dam, et al., THE CRYOGENIC SYSTEM FOR THE AGOR SUPERCONDUCTING CYCLOTRON,
Proceedings of the Eleventh International Conference on Cyclotrons and their
Applications, Tokyo, Japan, p548-p551.).When detecting that superconduction magnet exciting coil quenches, power supply disconnects,
Outer protective resistance is connected with superconduction magnet exciting coil, and the energy stored in superconducting magnet is discharged by outer protective resistance.Normal demagnetization
When, the energy that superconduction magnet exciting coil stores is discharged into by room temperature by outer protective resistance.
But for all bigger superconducting magnet of energy storage and inductance, outer protective resistance, which crosses conference, causes deactivation coil ultra-voltage mistake
Height, destroy coil insulation；Outer protective resistance is too small and down slope time constant can be caused very big, and the temperature rise in coil is too high.
Therefore guard method is quenched with outer protection based on interior protection, i.e., using the interior cold diode group of protection to the embedding of deactivation coil ultra-voltage
Position solves the problems, such as merely utilize outer protective resistance deactivation coil ultra-voltage it is too high, using pre-buried heater coil is uniformly lost
It is super, reduce the maximum temperaturerise in superconducting coil；Simultaneously using detection is quenched come deenergization, outer protective resistance is used in cut-out electricity
Portion of energy is taken out of superconducting coil behind source and provides backup for interior protective loop.But debug rank in superconducting cyclotron
Section, it is possible to frequently carry out demagnetize operation, it is necessary to it is a kind of it is safe, do not trigger the mode quenched cause superconduction magnet exciting coil store up
The energy deposited is discharged into normal temperature.
The content of the invention
It is an object of the invention to provide it is a kind of it is safe, do not trigger the fast of the big energy storage superconducting coil of cyclotron that quenches
Fast demagnetizing method so that the energy of the superconduction magnet exciting coil storage of superconducting cyclotron is discharged into normal temperature.
Technical scheme is as follows：A kind of quick demagnetizing method of the big energy storage superconducting coil of cyclotron, application
Protection system is quenched in superconducting coil, the protection system that quenches includes being arranged on the connecting line of superconduction magnet exciting coil and power supply
Controlling switch is quenched on road, the both ends of superconduction magnet exciting coil connect outer protective resistance, and described superconduction magnet exciting coil is parallel with
The interior cold diode group of protection, the interior cold diode group connection of protection quench heater, it is characterised in that：Superconduction excitation wire in this method
Circle is also parallel with quickly demagnetization and lets out energy diode group, and the conducting voltage that energy diode group is let out in described quick demagnetization is interior less than described
The conducting voltage of cold diode group is protected, sets quick demagnetization control to open on the connection line of superconduction magnet exciting coil and power supply
Close；
When superconduction magnet exciting coil is in superconducting state normal work, controlling switch closure, controlling switch of quickly demagnetizing are quenched
Also close, it is short by superconduction magnet exciting coil that energy diode group, outer protective resistance, the interior cold diode group of protection are let out in now quick demagnetization
Road, source current mainly pass through superconduction magnet exciting coil；
When needing demagnetization, quick controlling switch of demagnetizing disconnects, and quenches controlling switch and still close, superconduction magnet exciting coil
The quick demagnetization that the energy of storage is all discharged at room temperature is let out in energy diode group, outer protective resistance.
Further, the quick demagnetizing method of the big energy storage superconducting coil of cyclotron as described above, wherein, in satisfaction
In the case of stating condition, described quick demagnetization is let out can diode group and the diode group of the interior cold diode group use of protection
Type can be with identical also different, and conducting voltage can be adjusted by the number or circuit topological structure of the diode group used.
Beneficial effects of the present invention are as follows：The present invention proposes a kind of the quick of the big energy storage superconducting coil of cyclotron and moved back
Magnetism method, being let out using quick demagnetization can the energy release that the superconduction magnet exciting coil of superconducting cyclotron store of diode group
To normal temperature.This method causes superconducting cyclotron to use the protected mode that quenches based on interior protection with outer protection, drop
The probability of low superconducting cyclotron superconduction magnet exciting coil damage.
Brief description of the drawings
Fig. 1 is the principle schematic for the quick demagnetizing method that protection system is quenched applied to superconducting coil.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
The quick demagnetizing method of the big energy storage superconducting coil of cyclotron provided by the present invention, applied to superconducting coil
Protection system is quenched, as shown in figure 1, quenching protection system includes being arranged on the connection line of superconduction magnet exciting coil 5 and power supply 6
Quench controlling switch 8, the both ends of superconduction magnet exciting coil 5 connect outer protective resistance 3, and described superconduction magnet exciting coil 5 is parallel with
The interior cold diode group 4 of protection, the interior cold connection of diode group 4 of protection quench heater 7.Quench the concrete structure description of protection system
It may refer to the patent application " 230MeV superconducting cyclotron superconducting coils quench protection system " of applicant's same period.
The present invention makes superconduction magnet exciting coil 5 also be parallel with quick demagnetization and lets out energy on the basis of protection system architecture is quenched
Diode group 2, as shown in figure 1, and quick demagnetization let out can the conducting voltage of diode group 2 led less than the interior cold diode group 4 of protection
Be powered pressure, and quick demagnetization controlling switch 1 is set on the connection line of superconduction magnet exciting coil and power supply.
When superconduction magnet exciting coil 5 is in superconducting state normal work (when excitation or constant current are run), quick control of demagnetizing is opened
1 closure is closed, controlling switch 8 is quenched and closes, now quick demagnetization is let out can diode group 2, outer protective resistance 3, interior cold two pole of protection
Pipe group 4 mainly passes through superconduction magnet exciting coil 5 by the short circuit of superconduction magnet exciting coil 5, the electric current of power supply 6.
When needing demagnetization, the quick deenergization 6 of controlling switch 1 that demagnetizes；Quench controlling switch 8 still to close, quickly move back
Magnetic lets out energy diode group 2, outer protective resistance 3, and the interior cold diode group 4 of protection is in parallel with superconduction magnet exciting coil 5.Due to design
Quick demagnetization let out can diode group 2 conducting voltage less than the interior cold conducting voltage of diode group 4 of protection, so, during demagnetization, superconduction
The quick demagnetization that the energy that magnet exciting coil 5 stores all is discharged at room temperature is let out in energy diode group 2, outer protective resistance 3.
Embodiment
By taking the quick demagnetization process of certain 230MeV superconducting cyclotron superconduction magnet exciting coil as an example.As shown in figure 1, losing
On the basis of super protection system architecture, superconduction magnet exciting coil 5 is also parallel with quick demagnetization and let out energy diode group 2, by quick
Demagnetize the deenergization 6 of controlling switch 1；Quench controlling switch 8 to close, energy diode group 2, outer protective resistance 3 are let out in quick demagnetization, interior
Cold diode group 4 is protected, it is in parallel with superconduction magnet exciting coil 5.
The conducting voltage that energy diode group 2 is let out in the quick demagnetization of the present invention protects the cold conducting voltage of diode group 4 less than interior,
In protection system is quenched, the interior cold diode group 4 of protection is by two one group that can be operated in liquid helium temperature positive and negative connection back-to-back
The one or more series connection of unit of power diode composition formed, in liquid helium vessel, single power diode group list
The forward conduction voltage of member at low temperature is typically no less than 1V, and the clamped voltage of required conducting can be formed after multiple series connection.Full
The conducting voltage that energy diode group 2 is let out in the quick demagnetization of foot is less than under conditions of the interior cold conducting voltage of diode group 4 of protection, described
Quick demagnetization let out can diode group 2 and the interior diode set type for protecting cold diode group 4 to use can with it is identical not yet
Together, conducting voltage can be adjusted by the number or circuit topological structure of the diode group used.
In the present embodiment, the conducting voltage 18V of energy diode group 2 is let out in the quick demagnetization of design, less than interior cold two pole of protection
The conducting voltage 36V of pipe group 4, so, during demagnetization, quick demagnetization let out can the conducting of diode group, and the interior cold diode group 4 of protection is not led
It is logical.The energy that superconduction magnet exciting coil 5 stores all is discharged into quick demagnetization and let out in energy diode group 2, outer protective resistance 3.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if belonging to the model of the claims in the present invention and its equivalent technology to these modifications and variations of the present invention
Within enclosing, then the present invention is also intended to comprising including these changes and modification.
Claims (2)
1. a kind of quick demagnetizing method of the big energy storage superconducting coil of cyclotron, protection system is quenched applied to superconducting coil
System, the protection system that quenches include being arranged on the connection line of superconduction magnet exciting coil and power supply quenching controlling switch, surpassed
The both ends for leading magnet exciting coil connect outer protective resistance, and described superconduction magnet exciting coil is parallel with the interior cold diode group of protection, interior guarantor
Protect cold diode group connection and quench heater, it is characterised in that：Superconduction magnet exciting coil is also parallel with quick demagnetization and let out in this method
Conducting of the conducting voltage less than the interior cold diode group of protection of energy diode group is let out in energy diode group, described quick demagnetization
Voltage, quick demagnetization controlling switch is set on the connection line of superconduction magnet exciting coil and power supply；
When superconduction magnet exciting coil is in superconducting state normal work, controlling switch closure is quenched, quick controlling switch of demagnetizing also is closed
Close, now quick demagnetization lets out energy diode group, outer protective resistance, the interior cold diode group of protection by superconduction field coil short circuit condition, electricity
Ource electric current mainly passes through superconduction magnet exciting coil；
When needing demagnetization, quick controlling switch of demagnetizing disconnects, and quenches controlling switch and still close, the storage of superconduction magnet exciting coil
The quick demagnetization that is all discharged at room temperature of energy let out can be in diode group, outer protective resistance.
2. the quick demagnetizing method of the big energy storage superconducting coil of cyclotron as claimed in claim 1, it is characterised in that：It is described
Quick demagnetization let out can diode group and the interior diode set type for protecting cold diode group to use can with it is identical not yet
Together, conducting voltage can be adjusted by the number or circuit topological structure of the diode group used.
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| CN201610617024.0A CN106098291B (en) | 2016-07-29 | 2016-07-29 | The quick demagnetizing method of the big energy storage superconducting coil of cyclotron |
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| CN201610617024.0A CN106098291B (en) | 2016-07-29 | 2016-07-29 | The quick demagnetizing method of the big energy storage superconducting coil of cyclotron |
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| CN107123504B (en) * | 2017-07-03 | 2019-06-28 | 上海联影医疗科技有限公司 | Field system and drop field method drop in magnetic resonance magnet |
| CN107994544B (en) * | 2017-12-11 | 2019-02-26 | 合肥中科离子医学技术装备有限公司 | A kind of superconducting magnet system quenching protection device and its working method |
| CN109347341A (en) * | 2018-11-13 | 2019-02-15 | 中国原子能科学研究院 | It is a kind of with the ultrastability Switching Power Supply for quenching defencive function |
| CN109510167A (en) * | 2018-11-13 | 2019-03-22 | 中国原子能科学研究院 | A kind of compact superconducting cyclotron based on cascade quenches protection circuit |
| JP7405783B2 (en) * | 2021-02-02 | 2023-12-26 | 株式会社日立製作所 | Superconducting magnet device, magnetic resonance imaging device, and method for demagnetizing superconducting magnets |
| CN113903541B (en) * | 2021-11-04 | 2022-06-28 | 中国原子能科学研究院 | Large high-temperature superconducting magnetic system based on small refrigerator and temperature control method |
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| US6147844A (en) * | 1998-12-30 | 2000-11-14 | General Electric Company | Quench protection for persistant superconducting magnets for magnetic resonance imaging |
| CN101521078B (en) * | 2008-11-25 | 2011-06-29 | 天水电气传动研究所有限责任公司 | Superconducting magnet with quench protection circuit |
| GB2471325B (en) * | 2009-06-26 | 2011-05-18 | Siemens Magnet Technology Ltd | Quench energy dissipation for superconducting magnets |
| US8780510B2 (en) * | 2009-09-23 | 2014-07-15 | General Electric Company | Passive quench protection circuit for superconducting magnets |
| CN102214911B (en) * | 2011-05-27 | 2014-01-22 | 中国科学院电工研究所 | Superconducting magnet quenching protection device |
| CN102903473B (en) * | 2011-07-29 | 2016-03-30 | 通用电气公司 | superconducting magnet system |
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