Superconducting cyclotron vacuum chamber quartz lamp radiation baking method

Abstract

The invention discloses a superconducting cyclotron vacuum chamber quartz lamp radiation baking method. A superconducting cyclotron vacuum chamber, a function integration assembly, a vacuum pump pumping system, a quartz lamp radiation baking assembly and a high-purity nitrogen auxiliary inflation assembly are included. The superconducting cyclotron vacuum chamber is provided with a flange interface. According to the invention, the quartz lamp radiation heating assembly is used for rapidly heating the surface of the accelerator vacuum chamber part, high-purity nitrogen is used for assisting inscouring residual components on the inner surface of the vacuum chamber, the treated gas is replaced out of the vacuum chamber of the superconducting cyclotron, and the process is repeated, so that the acquisition of ultrahigh clean vacuum of the accelerator is accelerated, the test period of the accelerator is shortened, and the working efficiency of the accelerator is greatly improved. The quartz lamp heating assembly can be longitudinally fed or retracted, so that the accelerator is heated and baked to the maximum extent, the normal operation of the accelerator is not interfered spatially,and the limit vacuum degree which can be reached by the superconducting cyclotron vacuum chamber is improved.

Description

technical field [0001] The invention relates to the field of surface treatment of radioactive medical instruments, in particular to a radiation baking method for a quartz lamp in a vacuum chamber of a superconducting cyclotron. Background technique [0002] The superconducting cyclotron vacuum chamber is generally sealed by the main magnet and the outer Dewar of the superconducting coil. There are many internal components, and residues such as ethanol and cleaning agent will remain on the surface of each component during the assembly process. Among them, The water vapor contained in the cleaning process and the air has strong adhesion on the surface of the parts. During the operation of the vacuum system, water vapor will be continuously released into the cavity, thus greatly lengthening the time required for the accelerator to reach the ultimate vacuum. [0003] In the early debugging process of the accelerator, it is necessary to frequently open the vacuum chamber, disasse...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for radiating and baking quartz lamps in a vacuum chamber of a superconducting cyclotron to solve the problem of frequently opening the vacuum chamber, disassembling and cleaning parts for testing in the early stage debugging process of the accelerator. During the opening process and the cleaning process of the parts, a large amount of water vapor will be taken from the originally dry cavity and the surface of the parts. Therefore, each experimental debugging needs to wait for the slow and long-term water vapor release process, and only after reaching the required vacuum environment. The next step of the experimental operation can be carried out; after a short period of radiation baking, the release of water vapor can be accelerated, and then high-purity nitrogen with a very small adsorption heat capacity is injected into the vacuum chamber, thereby reducing the partial pressure of water vapor in the vacuum chamber, which can greatly improve Shorten the time for the accelerator to run to the vacuum required for commissioning and improve the test efficiency of the accelerator

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