Cryopump assembly regeneration method for neutral beam input system
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A technology of input system and cryopump, which is applied in pumps, pump control, liquid displacement machinery, etc., and can solve problems such as inability to adapt to regeneration of cryopump components and long time
Inactive Publication Date: 2021-07-30
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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[0009] The technical problem to be solved by the present invention is: how to solve the regeneration method in the prior art, which takes a long time and cannot be adapted to the regeneration of the cryopump assembly
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Embodiment 1
[0034] Such as figure 1 As shown, the cryopump assembly for the neutral beam input system includes a liquid nitrogen Dewar 1, a liquid helium Dewar 2, a molecular pump 3, a Roots pump 4, a cryopump 5, and a temperature measurement and control device 6, combined with image 3As shown, the liquid nitrogen Dewar 1 is connected to the radiation protection baffle 52 in the cryopump 5 through a liquid nitrogen tube, and is used to cool the radiation protection baffle 52, and the liquid helium Dewar 2 is connected to the cryogenic pump 5 through a liquid helium tube. The low-temperature adsorption surface 51 in the pump 5 is connected to cool the low-temperature adsorption surface 51. There are activated carbon and heating wires on the low-temperature adsorption surface 51. The activated carbon is used for adsorption, and the heating wire is used for heating. The temperature measurement and control device 6 is connected to the heating wire. The anti-radiation baffle 52 and the low-te...
Embodiment 2
[0079] In this embodiment, on the basis of the first embodiment above,
[0080] The complete regeneration includes the following steps:
[0081] (1) Close the liquid helium valve;
[0082] (2) Close the liquid nitrogen valve;
[0083] (3) Heating the low-temperature adsorption surface from 51 to 300K, and monitoring the heating process through the temperature sensor set on the panel;
[0084] (4) During heating to 300K, the temperature rises, and the gas adsorbed by activated carbon is gradually released;
[0085] (5) Open the air pump along with the heating process, gradually extract the released gas, and monitor the air extraction process by monitoring the pressure change;
[0086] (6) After the air extraction is completed, close the air extraction valve, and the complete regeneration is completed.
[0087] Whether to choose partial regeneration or partial regeneration followed by full regeneration depends on the usage; that is, partial regeneration can be performed alon...
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Abstract
The invention discloses a cryopump assembly regeneration method for a neutral beam input system. A cryopump assembly comprises a liquid nitrogen Dewar, a liquid helium Dewar, a molecular pump, a roots pump, a cryopump and a temperature measurement control device, wherein the liquid nitrogen Dewar is connected to an anti-radiation baffle in the cryopump, the liquid helium Dewar is connected to a low-temperature adsorption surface in the cryopump, activated carbon and a heating wire are arranged on the low-temperature adsorption surface, the temperature measurement control device is connected to the heating wire, the molecular pump and the roots pump are correspondingly connected to the cryopump, the regeneration process involves multiple cycles of heating, vacuumizing and refrigerating, and the number of times is greater than or equal to 5. The cryopump assembly regeneration method has the beneficial effects that the time of the whole regeneration process is shortened to about one hour, and compared with 6-8 hours of a natural regeneration process without a control system, the regeneration time is greatly shortened, and safe, stable and rapid temperature returning can be achieved in the temperature returning process.
Description
technical field [0001] The invention relates to the technical field of a neutral beam input system, in particular to a regeneration method for a cryopump assembly used in a neutral beam input system. Background technique [0002] The neutral beam injection system is a complex and decentralized tokamak injection heating device, including injector system, vacuum system, power supply system, chain protection system, beam diagnosis system and control system, etc. Among them, the injector system consists of a high-current ion source, a neutralization chamber, a deflection magnet, an ion devourer, a beam limiting target, a drift section, a power measurement target and a vacuum chamber. For the injector, the most important thing is the ion source that produces high-energy particles and the neutralization chamber that neutralizes high-energy particles. In the experiment, the high-current ion source uses high-current gas discharge to generate initial plasma, the temperature is gener...
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IPC IPC(8): F04B37/08F04B49/00F04B49/06
CPCF04B37/085F04B49/00F04B49/065
Inventor 王铭翔谢远来胡纯栋汪金新郎嘉琪陶玲唐宁章思
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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