Title: First fusion proton measurements in TEXTOR plasmas using activation technique
Authors: BONHEURE GeorgesMLYNAR J.VAN WASSENHOVE G.HULT MikaelGONZALEZ DE ORDUNA R.LUTTER GUILLAUMEVERMAERCKE P.HUBER A.SCHWEER B.ESSER G.BIEL W.
Citation: REVIEW OF SCIENTIFIC INSTRUMENTS vol. 83 no. 10 p. 10D318 [3 pages]
Publisher: AMER INST PHYSICS
Publication Year: 2012
JRC N°: JRC79518
ISSN: 0034-6748
URI: http://dx.doi.org/10.1063/1.4739228
http://publications.jrc.ec.europa.eu/repository/handle/JRC79518
DOI: 10.1063/1.4739228
Type: Articles in periodicals and books
Abstract: MeV particle loss measurements from fusion plasmas, in particular alpha particles, remain difficult in large fusion devices and further R&D is needed for ITER. This paper describes the first attempt to measure 3 MeV escaping fusion protons emitted from TEXTOR tokamak plasmas using activation technique. This technique was successfully demonstrated, initially, in 2006 on the JET tokamak. An ion camera equipped with a collimator and several types of activation detectors was installed inside the TEXTOR vacuum vessel to perform these measurements. After irradiation, the detectors were analyzed using ultra low level gamma-ray spectrometry at the HADES underground laboratory. 3MeV escaping fusion protons were detected in larger number −~6 times more - compared to earlier measurements using this technique on JET. Another major progress was the reduction of the cooling time by a factor of 50, which made possible to detect radionuclides with half-life of less than 90 min.
JRC Directorate:Health, Consumers and Reference Materials

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