Vacuum feed port ceramic sealing structure of ion-turbulent resonance heating antenna

Abstract

The invention discloses an ion cyclotron resonance heating antenna vacuum feed mouth ceramic sealing structure, comprising a vitrified pipe, the left and right end surfaces of which are metallized end surfaces, and is characterized in that: the inner walls of the left end and the right end of the vitrified pipe are sheathed with a first and a second oxygen-free copper flanges, the first and the second oxygen-free copper flanges are provided with annular inner and outer flangings welded on the metallized left end surface of the vitrified pipe by vacuum; a first and a second stainless steel sealing flanges are welded on annular inner and outer flangings of the first and the second oxygen-free copper flanges; the first and the second stainless steel sealing flanges are respectively provided with the annular inner and outer flangings, the outer ends of which becomes conic structure from thick to thin gradually. The outer ends of the flanges are conic structure, aiming at reducing heat conduction amount to the ceramics when a crunch seal part and the inner and outer conductors are welded by lengthening the heat transfer path and reducing the heat transfer area, thus finally reducing the heat stress among the stainless steel flanges and the ceramics when welding, and guaranteeing the successful welding of the crunch seal parts and the inner and the outer conductors.

Description

technical field [0001] The invention belongs to the field of ion cyclotron resonance (ICRF) heating, in particular to a ceramic sealing structure of a vacuum feed port of an ion cyclotron resonance heating antenna. Background technique [0002] In the existing tokamak nuclear fusion device, ion cyclotron resonance heating (ICRF) is one of the very important auxiliary heating means on the tokamak device. The vacuum feeder is one of the key components of the ion cyclotron heating antenna, which plays a huge role in isolating the external atmosphere from entering the internal vacuum, and the requirements for vacuum sealing are quite high. If this part leaks, it will render the entire tokamak inoperable. The vacuum feeder is welded by inner and outer conductors and ceramic sealing parts. In the vacuum feeder, the structural design of the ceramic sealing part is the most difficult, because the ceramic sealing part is welded by high-voltage insulating ceramics and sealing metal f...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a ceramic sealing structure for ion cyclotron resonance heating antenna vacuum feeder, which can solve the problem of cracking the insulating ceramics due to excessive thermal stress during the welding process. The welding process is mature, no special fixtures are needed during welding, and the welding success rate High, low welding cost; In addition, it can be easily and successfully welded with the inner and outer conductors

Images