| The MAST motional Stark effect diagnostic. | |
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MedLine Citation:
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PMID: 21033929 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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A motional Stark effect (MSE) diagnostic is now installed and operating routinely on the MAST spherical tokamak, with 35 radial channels, spatial resolution of ∼2.5 cm, and time resolution of ∼1 ms at angular noise levels of ∼0.5°. Conventional (albeit very narrow) interference filters isolate π or σ 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 π component is observed to be significantly stronger than σ, in reasonably good agreement with atomic physics calculations, and as a result, almost all channels are now operated on π. 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. |
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Authors:
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N J Conway; M F M De Bock; C A Michael; M J Walsh; P G Carolan; N C Hawkes; E Rachlew; J F G McCone; S Shibaev; G Wearing |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Review of scientific instruments Volume: 81 ISSN: 1089-7623 ISO Abbreviation: Rev Sci Instrum Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-11-01 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0405571 Medline TA: Rev Sci Instrum Country: United States |
Other Details:
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Languages: eng Pagination: 10D738 Citation Subset: - |
Affiliation:
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EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB, United Kingdom. neil.conway@ccfe.ac.uk |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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