Operating limits of the upgraded JET neutral beam injector from duct re-ionisation and beam shine-through

IF 0.3 1区艺术学 0 MUSIC

NINETEENTH CENTURY MUSIC Pub Date : 2002-11-07 DOI:10.1109/FUSION.2002.1027642

S. Cox, A. Bickley, T. Jones, J. Milnes

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引用次数: 5

Abstract

Physics modelling and engineering analysis have been carried out to determine the operating limits of the upgraded JET neutral beam injector from duct re-ionisation and beam shine-through. The JET neutral beam duct is only 23cm wide and 90cm tall at its throat and yet it presently has to transmit more than 11MW of D/sup 0/ beam particles, resulting in power densities in excess of 200MW/m/sup 2/. Even at this power level, the copper duct liner can be the limiting component with respect to the pulse length of the Octant 4 injector, depending on plasma current and power. The upgrade to the Octant 8 injector in 2002 will increase the power to /spl sim/15MW of D/sup 0/ at 130kV, so it is necessary to determine the new limits. It is shown that at full power, the duct will become the major limiting component with respect to pulse length for this injector. The shine-through power density and integrated energy for various in-vessel components have also been evaluated for the upgraded injector. Thermo-mechanical finite element stress calculations on elements of the ICRH antenna show that the injector can be operated at full power without further restrictions being imposed on the plasma characteristics, e.g. density and shape. For the CFC inner wall guard limiter tiles and their internal reinforcement, however, there is a bulk temperature limit and an enhancement to the existing real-time protection system is proposed.

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升级后的JET中性束喷射器在管道再电离和光束穿透下的工作限制

通过物理建模和工程分析，从管道再电离和光束穿透两方面确定了升级后的JET中性束喷射器的工作极限。JET中性光束导管在喉部只有23厘米宽，90厘米高，但它目前必须传输超过11MW的D/sup /光束粒子，导致功率密度超过200MW/m/sup /。即使在这个功率水平下，根据等离子体电流和功率的不同，铜管道衬垫也可能成为Octant 4注入器脉冲长度的限制部件。2002年升级到Octant 8喷油器将在130kV时将功率增加到/spl sim/15MW / D/sup /，因此有必要确定新的限制。结果表明，在满功率时，导管将成为该喷射器脉冲长度的主要限制部件。还对升级后的注入器的各种容器内组件的穿透功率密度和综合能量进行了评估。对ICRH天线元件的热-机械有限元应力计算表明，注入器可以在全功率下工作，而不会对等离子体特性(例如密度和形状)施加进一步的限制。然而，对于CFC内墙保护限制瓦及其内部加固，存在整体温度限制，并提出了对现有实时保护系统的改进。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

NINETEENTH CENTURY MUSIC MUSIC-

CiteScore

0.40

自引率

0.00%

发文量

期刊介绍： 19th-Century Music covers all aspects of Western art music between the mid-eighteenth and mid-twentieth centuries. We welcome--in no particular order--considerations of composers and compositions, styles, performance, historical watersheds, cultural formations, critical methods, musical institutions, ideas, and topics not named on this list. Our aim is to publish contributions to ongoing conversations at the leading edge of musical and multidisciplinary scholarship.