Non-round section thin-wall vacuum pipeline and non-round section thin-wall vacuum chamber

Abstract

The invention relates to the field of electric vacuum, and in particular relates to a large non-round section thin-wall vacuum chamber which can be used in a high-frequency alternating electric field or an alternating magnetic field. The pipeline wall section of the non-round section thin-wall vacuum pipeline, which is close to a magnetic pole, is a straight line; the section is characterized in that pipeline walls on two sides of the straight-line pipeline wall are in semicircular arc; the section of the whole pipeline is in a runway shape; and the height of the vacuum pipeline is 10-90mm, the width of the vacuum pipeline is 10-250mm, and the thickness of the vacuum pipeline is 0.3-1mm. According to the large non-round section thin-wall vacuum chamber, the design problem of the large thin-wall vacuum chamber under the large-range high-frequency alternating electric field or the alternating magnetic field can be solved. The purpose of designing into the non-round section is to lower a magnetic pole gap of an electromagnet by lowering the height of vacuum chamber so as to lower engineering construction cost.

Description

technical field [0001] The invention mainly relates to the field of electric vacuum, in particular to a large non-circular cross-section thin-walled vacuum chamber that can be used under high-frequency alternating electric field or alternating magnetic field. Background technique [0002] Due to the construction requirements of Lanzhou Heavy Ion Tumor Therapy Facility (HITFiL), a thin-walled vacuum chamber with a large non-circular section is designed, which can not only meet the requirements for use in high-frequency alternating electric fields or alternating magnetic fields, but also reduce electromagnetic waves as much as possible. The ferromagnetic pole gap greatly reduces the construction cost of the project. Under the above working conditions, due to the eddy current effect generated in the vacuum chamber, it cannot be made of bulky metal. At present, for small vacuum chambers, thin-walled round-section stainless steel tubes are used to meet the requirements of overco...

AI Technical Summary

Problems solved by technology

For large vacuum chambers, if only scaled up, for the beam current in the elliptical or racetrack-shaped envelope section in the vacuum chamber, not only the useless space of the circular cross-section pipeline is increased, but also the magnetic pole gap of the electromagnet is greatly increased, making The overall manufacturing and operating costs of the accelerator have increased significantly

In addition, the wall thickness of the scaled-up stainless steel tube should not be too thick, which will generate a large eddy current effect; another problem is that it is difficult to control the roundness of the large-diameter thin-walled stainless steel tube, and the local out-of-roundness will cause collapse and deformation after vacuuming, and chain After the reaction, the entire vacuum chamber is destroyed

Images