CN107481831A - A kind of cool-down method of superconducting cyclotron superconducting magnet - Google Patents
A kind of cool-down method of superconducting cyclotron superconducting magnet Download PDFInfo
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- CN107481831A CN107481831A CN201710611372.1A CN201710611372A CN107481831A CN 107481831 A CN107481831 A CN 107481831A CN 201710611372 A CN201710611372 A CN 201710611372A CN 107481831 A CN107481831 A CN 107481831A
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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
- H01F6/04—Cooling
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Abstract
The invention belongs to superconducting cyclotron field.To solve the problems such as existing superconducting magnet cool-down method temperature-fall period in China is complicated, cooling is time-consuming longer, the invention provides a kind of cool-down method of superconducting cyclotron superconducting magnet.The cool-down method comprises the following steps：First, superconducting magnet is vacuumized；2nd, liquid nitrogen refrigerating is carried out to superconducting magnet, while adjusts the radial direction pull bar length of the superconducting magnet；3rd, liquid nitrogen is discharged, superconducting magnet is vacuumized；4th, liquid helium refrigeration is carried out to superconducting magnet, completes cooling.The cool-down method of the superconducting cyclotron superconducting magnet of the present invention employs two-part cooling, including liquid nitrogen cooling process and liquid helium temperature-fall period, its cooling step is reasonable in design, temperature fall time is shorter, it is easy to operate, on the premise of being required meeting superconducting coil cooling, the consumption of liquid nitrogen and liquid helium is effectively saved.
Description
Technical field
The invention belongs to superconducting cyclotron field, more particularly to a kind of cooling of superconducting cyclotron superconducting magnet
Method.
Background technology
Cyclotron is a kind of particle accelerator, and it returns charged particle using magnetic field and the collective effect of electric field
Rotation motion, and the device accelerated repeatedly to the charged particle of circumnutation with high-frequency electric field.Wherein, superconducting cyclotron
It is the nucleus equipment of current medical proton therapy accelerator.
Medical proton therapy accelerator is the most advanced radiotherapy equipment in the world today, and it can utilize microcosmic matter
Son, Heavy ion beam treatment tumour, it is evident in efficacy, there is good development prospect and huge commercial value, it is only individual at present
Other developed country grasps and applies the technology；And China is in the development stage, mature technology there is no to be available for using.But for
Commercial interest etc. considers that many key technologies about medical proton therapy accelerator are not disclosed so far so that China
Development work need to break through relevant key technology one by one and can just be accomplished.
The magnetic field of superconducting cyclotron is mainly provided by superconducting coil, and superconducting coil, which enters superconducting state, needs necessarily low
Warm condition, it is therefore desirable to cool to superconducting magnet.However, the existing superconducting cyclotron superconducting magnet cool-down method in China
Its temperature-fall period is complicated, cooling is time-consuming longer, still immature, therefore to realize the development of medical proton therapy accelerator, just
A kind of cool-down method of effective superconducting cyclotron superconducting magnet must be developed.
The content of the invention
To solve the problems such as existing superconducting magnet cool-down method temperature-fall period in China is complicated, cooling is time-consuming longer, the present invention
Provide a kind of cool-down method of superconducting cyclotron superconducting magnet.The cool-down method comprises the following steps：
(1) superconducting magnet is vacuumized, vacuum leak hunting is carried out to the superconducting magnet after vacuumizing；
(2) liquid nitrogen is conveyed into the superconducting magnet from liquid nitrogen container by liquid nitrogen transfer pipeline, opens the first refrigeration machine pair
The liquid nitrogen being delivered in the superconducting magnet is freezed, and the superconducting magnetic body temperature is down to below 77K；It is same with this
When, the radial direction pull bar length of the superconducting magnet is adjusted, is allowed to match with superconducting magnet shrinkage amount；
(3) liquid nitrogen in the superconducting magnet is discharged, then the superconducting magnet is vacuumized when being passed through helium, it is right
Superconducting magnet carries out vacuum leak hunting；
(4) liquid helium is conveyed into the superconducting magnet from liquid helium tank by liquid helium transfer pipeline, opens the second refrigeration machine pair
The liquid helium being delivered in the superconducting magnet is freezed, and the superconducting magnetic body temperature is down to below 4.5K, is completed
The cooling of the superconducting magnet.
In step (1), described is preferably molecule pump assembly to the vaccum-pumping equipment that superconducting magnet vacuumizes.
It is connected as preferably using bellows between the molecule pump assembly and superconducting magnet.
It is described that superconducting magnet is vacuumized in step (1), it is desirable to which that vacuum reaches 1 × 10-2Pa is preferred.
In step (1), the vacuum leak hunting requires that leak rate is less than 1 × 10-10PaL/s is preferred.
It is preferred that first refrigeration machine, which uses single stage,.
In step (2), described the superconducting magnetic body temperature is down to below 77K, its temperature is preferably 70K.
In step (3), the vacuum leak hunting requires that leak rate is less than 1 × 10-10PaL/s is preferred.
It is preferred that second refrigeration machine, which uses two stage cooler,.
In step (4), described the superconducting magnetic body temperature is down to below 4.5K, its temperature is preferably 4.2K.
In summary, the cool-down method of superconducting cyclotron superconducting magnet of the invention employs two-part cooling, bag
Liquid nitrogen cooling process and liquid helium temperature-fall period are included, its cooling step is reasonable in design, and temperature fall time is shorter, easy to operate, Neng Gou
On the premise of meeting that superconducting coil cooling requires, the consumption of liquid nitrogen and liquid helium is effectively saved,
Embodiment
Embodiments of the present invention are described further with reference to specific embodiment.
Embodiment
The cool-down method of the superconducting cyclotron superconducting magnet of the present invention, a kind of its preferred embodiment are as follows：
(1) vacuum pumping opening of superconducting magnet and molecule pump assembly are linked together with bellows, altogether using two points
Sub- pump assembly, it is connected to two bellowss in two vacuum pumping openings of superconducting magnet.Molecule pump assembly is opened to super
Vacuumized inside magnetic conductor and monitor vacuum, when vacuum is less than 1 × 10-2Complete to vacuumize during Pa.Superconducting magnet is carried out
Vacuum leak hunting, it is desirable to which leak rate is less than 1 × 10-10PaL/s。
(2) superconducting magnet and liquid nitrogen container are connected with liquid nitrogen transfusion pipe, liquid nitrogen transfusion pipe one end is fixed with liquid nitrogen container, will
In the infusion port of liquid nitrogen transfusion pipe other end insertion superconducting magnet.Open liquid nitrogen tank valve, from liquid nitrogen container into superconducting magnet it is defeated
Enter liquid nitrogen, start liquid nitrogen cooling.Single stage is opened, totally two single stages, are opened simultaneously.Monitor superconducting magnetic body temperature
Degree, when superconducting magnet temperature is down to 70K, liquid nitrogen tank valve is closed, stops inputting liquid nitrogen into superconducting magnet, stop single-stage system
Cold.The radial direction pull bar length of superconducting magnet is adjusted, prevents that radial direction pull bar stress is excessive, altogether using 4 radial direction pull bars.
(3) superconducting magnet is suppressed, discharges its internal liquid nitrogen, liquid nitrogen transfusion of dismantling pipe, when vacuumizing to super
Helium is passed through in the infusion port of magnetic conductor.Vacuum leak hunting is carried out to superconducting magnet, it is desirable to which leak rate is less than 1 × 10-10PaL/s。
(4) superconducting magnet and liquid helium tank are connected with On Tranofer Tube For Liquid Helium, On Tranofer Tube For Liquid Helium one end and liquid helium tank is fixed, will
In On Tranofer Tube For Liquid Helium other end insertion superconducting magnet infusion port.Open liquid helium tank valve and liquid helium is inputted into superconducting magnet, start
Liquid helium cools.Two stage cooler is opened, constantly caused helium in liquid helium temperature-fall period liquefies and returns to superconducting magnet, adopts altogether
With 4 two stage coolers, wherein 3 are opened, another 1 standby.Superconducting magnet temperature is monitored, when superconducting magnet temperature is down to 4.2K
When, liquid helium tank valve is closed, stops inputting liquid helium into superconducting magnet, completes the liquid helium cooling of superconducting magnet.
Claims (10)
1. a kind of cool-down method of superconducting cyclotron superconducting magnet, it is characterised in that the cool-down method comprises the following steps：
(1) superconducting magnet is vacuumized, vacuum leak hunting is carried out to the superconducting magnet after vacuumizing；
(2) liquid nitrogen is conveyed into the superconducting magnet from liquid nitrogen container by liquid nitrogen transfer pipeline, opens the first refrigeration machine to conveying
Liquid nitrogen in the superconducting magnet is freezed, and the superconducting magnetic body temperature is down to below 77K；At the same time,
The radial direction pull bar length of the superconducting magnet is adjusted, is allowed to match with superconducting magnet shrinkage amount；
(3) liquid nitrogen in the superconducting magnet is discharged, then the superconducting magnet is vacuumized when being passed through helium, to superconduction
Magnet carries out vacuum leak hunting；
(4) liquid helium is conveyed into the superconducting magnet from liquid helium tank by liquid helium transfer pipeline, opens the second refrigeration machine to conveying
Freezed to the liquid helium in the superconducting magnet, the superconducting magnetic body temperature is down to below 4.5K, described in completion
The cooling of superconducting magnet.
2. the cool-down method of superconducting cyclotron superconducting magnet as claimed in claim 1, it is characterised in that：Step (1)
In, the vaccum-pumping equipment vacuumized to superconducting magnet is molecule pump assembly.
3. the cool-down method of superconducting cyclotron superconducting magnet as claimed in claim 2, it is characterised in that：The molecular pump
Connected between unit and superconducting magnet using bellows.
4. the cool-down method of superconducting cyclotron superconducting magnet as claimed in claim 1, it is characterised in that：Step (1)
In, it is described that superconducting magnet is vacuumized, it is desirable to which that vacuum reaches 1 × 10-2Pa。
5. the cool-down method of superconducting cyclotron superconducting magnet as claimed in claim 1, it is characterised in that：Step (1)
In, the vacuum leak hunting requires that leak rate is less than 1 × 10-10PaL/s。
6. the cool-down method of superconducting cyclotron superconducting magnet as claimed in claim 1, it is characterised in that：First system
Cold uses single stage.
7. the cool-down method of superconducting cyclotron superconducting magnet as claimed in claim 1, it is characterised in that：Step (2)
In, described the superconducting magnetic body temperature is down to below 77K, its temperature is 70K.
8. the cool-down method of superconducting cyclotron superconducting magnet as claimed in claim 1, it is characterised in that：Step (3)
In, the vacuum leak hunting requires that leak rate is less than 1 × 10-10PaL/s。
9. the cool-down method of superconducting cyclotron superconducting magnet as claimed in claim 1, it is characterised in that：Second system
Cold uses two stage cooler.
10. the cool-down method of superconducting cyclotron superconducting magnet as claimed in claim 1, it is characterised in that：Step (4)
In, described the superconducting magnetic body temperature is down to below 4.5K, its temperature is 4.2K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710611372.1A CN107481831A (en) | 2017-07-25 | 2017-07-25 | A kind of cool-down method of superconducting cyclotron superconducting magnet |
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| CN201710611372.1A CN107481831A (en) | 2017-07-25 | 2017-07-25 | A kind of cool-down method of superconducting cyclotron superconducting magnet |
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| CN201710611372.1A Pending CN107481831A (en) | 2017-07-25 | 2017-07-25 | A kind of cool-down method of superconducting cyclotron superconducting magnet |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110957099A (en) * | 2019-12-27 | 2020-04-03 | 西部超导材料科技股份有限公司 | Superconducting magnet with four-corner-shaped coils for magnetically controlled Czochralski single crystal pulling and method thereof |
| CN111596240A (en) * | 2020-06-17 | 2020-08-28 | 中国科学院合肥物质科学研究院 | Fast excitation testing device for superconducting dipolar iron of proton heavy ion medical equipment |
| CN113611472A (en) * | 2021-08-25 | 2021-11-05 | 合肥中科离子医学技术装备有限公司 | Superconducting magnet system for cyclotron and cyclotron with superconducting magnet system |
| CN113903541A (en) * | 2021-11-04 | 2022-01-07 | 中国原子能科学研究院 | Large high-temperature superconducting magnetic system based on small refrigerator and temperature control method |
| US11600415B2 (en) | 2021-08-25 | 2023-03-07 | Hefei Cas Ion Medical And Technical Devices Co., Ltd. | Superconducting magnet system for cyclotron and cyclotron comprising ihe same |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110957099A (en) * | 2019-12-27 | 2020-04-03 | 西部超导材料科技股份有限公司 | Superconducting magnet with four-corner-shaped coils for magnetically controlled Czochralski single crystal pulling and method thereof |
| CN111596240A (en) * | 2020-06-17 | 2020-08-28 | 中国科学院合肥物质科学研究院 | Fast excitation testing device for superconducting dipolar iron of proton heavy ion medical equipment |
| CN113611472A (en) * | 2021-08-25 | 2021-11-05 | 合肥中科离子医学技术装备有限公司 | Superconducting magnet system for cyclotron and cyclotron with superconducting magnet system |
| CN113611472B (en) * | 2021-08-25 | 2022-05-20 | 合肥中科离子医学技术装备有限公司 | Superconducting magnet system for cyclotron and cyclotron with superconducting magnet system |
| US11600415B2 (en) | 2021-08-25 | 2023-03-07 | Hefei Cas Ion Medical And Technical Devices Co., Ltd. | Superconducting magnet system for cyclotron and cyclotron comprising ihe same |
| CN113903541A (en) * | 2021-11-04 | 2022-01-07 | 中国原子能科学研究院 | Large high-temperature superconducting magnetic system based on small refrigerator and temperature control method |
| 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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Application publication date: 20171215 |