The MAST motional Stark effect diagnostic

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dc.contributor.authorConway, N. J.
dc.contributor.authorDe Bock, M. F. M.
dc.contributor.authorMichael, C. A.
dc.contributor.authorWalsh, M. J.
dc.contributor.authorCarolan, P. G.
dc.contributor.authorHawkes, N. C.
dc.contributor.authorRachlew, E.
dc.contributor.authorMcCone, J. F. G.
dc.contributor.authorShibaev, S.
dc.contributor.authorWearing, G.
dc.date.accessioned2015-12-07T03:07:16Z
dc.date.available2015-12-07T03:07:16Z
dc.date.issued2010
dc.date.updated2015-12-08T10:37:15Z
dc.description.abstractA 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.
dc.description.sponsorshipThis work was funded partly by the United Kingdom Engineering and Physical Sciences Research Council under Grant No. P/G003955 and by the European Communities under the contract of association between Euratom and CCFE.en_AU
dc.format7 pages
dc.identifier.issn0034-6748en_AU
dc.identifier.urihttp://hdl.handle.net/1885/17059
dc.publisherAmerican Institute of Physics (AIP)
dc.rights© 2010 AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Review of Scientific Instruments and may be found at http://doi.org/10.1063/1.3494254 http://publishing.aip.org/authors/copyright-reuse http://www.sherpa.ac.uk/romeo/issn/0034-6748 Author can archive publisher's version/PDF (Sherpa/Romeo as of 7/12/2015).
dc.sourceReview of Scientific Instruments
dc.subjectmotional Stark effect (MSE)
dc.subjectMAST spherical tokamak
dc.subject35 radial channels
dc.subjectspatial resolution
dc.subject∼2.5 cm
dc.subjecttime resolution
dc.subject∼1 ms
dc.subjectangular noise
dc.subject∼0.5°
dc.subjectπ component
dc.subjectσ
dc.subjectatomic physics
dc.titleThe MAST motional Stark effect diagnostic
dc.typeJournal article
dcterms.dateAccepted2010-08-25
local.bibliographicCitation.issue10en_AU
local.bibliographicCitation.startpage10D738en_AU
local.contributor.affiliationConway, N.J., EURATOM/UKAEA Fusion Association, United Kingdomen_AU
local.contributor.affiliationDe Bock, M F M, Eindhoven University of Technology, Netherlandsen_AU
local.contributor.affiliationMichael, Clive, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Plasma Research Laboratory, The Australian National Universityen_AU
local.contributor.affiliationWalsh, M.J., ITER Organization, Franceen_AU
local.contributor.affiliationCarolan, P.G., EURATOM/UKAEA Fusion Association, United Kingdomen_AU
local.contributor.affiliationHawkes, N C, EURATOM/CCFE Fusion Association, United Kingdomen_AU
local.contributor.affiliationRachlew, E., EURATOM-VR Association, Swedenen_AU
local.contributor.affiliationMcCone, J., University College, Association EURATOM-DCU Ireland. , Irelanden_AU
local.contributor.affiliationShibaev, S, EURATOM/CCFE Fusion Association, United Kingdomen_AU
local.contributor.affiliationWearing, G., EURATOM/CCFE Fusion Association, United Kingdomen_AU
local.contributor.authoruidu9617655en_AU
local.description.notesImported from ARIES. At the time of publication, Clive A. Michael was affiliated with EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB, United Kingdom.en_AU
local.identifier.absfor020204en_AU
local.identifier.ariespublicationu4695161xPUB144en_AU
local.identifier.citationvolume81en_AU
local.identifier.doi10.1063/1.3494254en_AU
local.identifier.essn1089-7623en_AU
local.identifier.scopusID2-s2.0-78149426771
local.publisher.urlhttps://www.aip.org/en_AU
local.type.statusPublished Versionen_AU

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