Two dimensional radiated power diagnostics on Alcator C-Mod

被引：39
|
作者：
Reinke, M. L. [1 ]
Hutchinson, I. H. [1 ]
机构：
[1] MIT, Cambridge, MA 02139 USA
来源：
REVIEW OF SCIENTIFIC INSTRUMENTS | 2008年 / 79卷 / 10期
关键词：
bolometers; emissivity; plasma diagnostics; plasma properties; Tokamak devices;
D O I：
10.1063/1.2965018
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
The radiated power diagnostics for the Alcator C-Mod tokamak have been upgraded to measure two dimensional structure of the photon emissivity profile in order to investigate poloidal asymmetries in the core radiation. Commonly utilized unbiased absolute extreme ultraviolet (AXUV) diode arrays view the plasma along five different horizontal planes. The layout of the diagnostic set is shown and the results from calibrations and recent experiments are discussed. Data showing a significant, 30%-40%, inboard/outboard emissivity asymmetry during ELM-free H-mode are presented. The ability to use AXUV diode arrays to measure absolute radiated power is explored by comparing diode and resistive bolometer-based emissivity profiles for highly radiative L-mode plasmas seeded with argon. Emissivity profiles match in the core but disagree radially outward resulting in an underprediction of P(rad) of nearly 50% by the diodes compared to P(rad) determined using resistive bolometers.
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页数：4
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