The MAST motional Stark effect diagnostic

被引：28

作者：

Conway, N. J. ^{[1
]}

De Bock, M. F. M. ^{[1
]}

Michael, C. A. ^{[1
]}

Walsh, M. J. ^{[1
]}

Carolan, P. G. ^{[1
]}

Hawkes, N. C. ^{[1
]}

Rachlew, E. ^{[2
]}

McCone, J. F. G. ^{[3
]}

Shibaev, S. ^{[1
]}

Wearing, G. ^{[1
]}

机构：

[1] EURATOM CCFE Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[2] EURATOM VR Assoc, KTH, Dept Phys, SE-10691 Stockholm, Sweden

[3] Dublin City Univ, Univ Coll Cork, Assoc EURATOM, Dept Phys, Cork, Ireland

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2010年 / 81卷 / 10期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1063/1.3494254

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A motional Stark effect (MSE) diagnostic is now installed and operating routinely on the MAST spherical tokamak, with 35 radial channels, spatial resolution of similar to 2.5 cm, and time resolution of similar to 1 ms at angular noise levels of similar to 0.5 degrees. Conventional (albeit very narrow) interference filters isolate pi or sigma polarized emission. Avalanche photodiode detectors with digital phase-sensitive detection measure the harmonics of a pair of photoelastic modulators operating at 20 and 23 kHz, and thus the polarization state. The pi component is observed to be significantly stronger than sigma, in reasonably good agreement with atomic physics calculations, and as a result, almost all channels are now operated on pi. Trials with a wide filter that admits the entire Stark pattern (relying on the net polarization of the emission) have demonstrated performance almost as good as the conventional channels. MSE-constrained equilibrium reconstructions can readily be produced between pulses. [doi:10.1063/1.3494254]

引用

页数：6

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