Fuelling efficiency of massive gas injection in TEXTOR: mass scaling and importance of gas flow dynamics

被引：22

作者：

Bozhenkov, S. A. ^{[1
]}

Lehnen, M. ^{[2
]}

Finken, K. H. ^{[2
]}

Bertschinger, G. ^{[2
]}

Koslowski, H. R. ^{[2
]}

Reiter, D. ^{[2
]}

Wolf, R. C.

机构：

[1] Max Planck Inst Plasma Phys, D-17491 Greifswald, Germany

[2] Forschungszentrum Julich, Inst Energy Res Plasma Phys, EURATOM Assoc, D-52425 Julich, Germany

来源：

NUCLEAR FUSION | 2011年 / 51卷 / 08期

关键词：

RUNAWAY CURRENT TERMINATION; LOW-DENSITY PLASMA; DISRUPTION MITIGATION; PROFILE MEASUREMENTS; TOKAMAK DISCHARGES; OPERATIONAL LIMITS; ELECTRON-DENSITY; MHD STABILITY; CHAPTER; JT-60U;

D O I：

10.1088/0029-5515/51/8/083033

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Fuelling efficiency is an important parameter in designing a massive gas injection system for suppression of runaway electrons in ITER. In this work Z-dependence of fuelling efficiency is measured for TEXTOR. The dependence covers the following gases: He, Ne, Ar, Kr, Xe and a 10% Ar-D2 mixture. It is shown that the fuelling efficiency significantly decreases with the gas mass, from above 0.5 for He to below 0.03 for Xe. To explain the variation of the efficiency with the gas mass and pressure a simple model of gas flow from the valve to the plasma edge is developed. The flow model is validated using available laboratory flow measurements of a TEXTOR-like injection system. An unsteady gas flow and a premature plasma disruption are shown to explain the mass dependence of the efficiency.

引用

页数：10

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