Energetic high-voltage breakdowns in vacuum over a large gap for ITER neutral beam accelerator

被引：6

作者：

Villecroze, F. ^{[1
]}

Christin, L. ^{[1
]}

de Esch, H. P. L. ^{[1
]}

Simonin, A. ^{[1
]}

Schunke, B. ^{[2
]}

Svensson, L. ^{[2
]}

Hemsworth, R. ^{[2
]}

Boilson, D. ^{[2
]}

机构：

[1] CEA, IRFM, F-13108 St Paul Les Durance, France

[2] ITER Org, F-13115 St Paul Les Durance, France

来源：

FUSION ENGINEERING AND DESIGN | 2013年 / 88卷 / 6-8期

关键词：

ITER; Neutral beam; High-voltage; Breakdown; Stored energy;

D O I：

10.1016/j.fusengdes.2012.12.012

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

CEA has undertaken tests to study the resilience of copper electrodes in vacuum against energetic high-voltage breakdowns using external capacitors to provide the energy. Earlier tests succeeded in dissipating a maximum of 150J in a 30 mm gap, limited by the equivalent series resistance (ESR) in the external capacitors. Using new ones with an ESR that is a factor of 10 lower it was unsuccessfully tried to produce breakdowns at 200 kV over the 85 mm gap, despite the use of a UV flash lamp and a "field enhancement ring" (FER) that locally increased the electric field on the cathode by 50%. Consequently, the breakdowns had to be produced by raising the voltage to 300-350 kV while maintaining the gap at 85 mm. During these tests, single breakdowns dissipated up to 1140J in the 85 mm vacuum gap. Inspection of the electrodes revealed that substantial amounts of copper appear have been evaporated from the anode and deposited on to the cathode. Also electrode deconditioning occurred. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：891 / 894

页数：4

共 4 条

[1] PENETRATION AND ENERGY-LOSS THEORY OF ELECTRONS IN SOLID TARGETS [J].