title: First fusion proton measurements in TEXTOR plasmas using activation technique.
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. 3 MeV 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.
authors.affiliation: ERM-KMS, Trilateral Euregio Cluster, B-1000 Brussels, Belgium. g.bonheure@fz-juelich.de
authors.forename: G
authors.initials: G
authors.lastname: Bonheure
authors.forename: J
authors.initials: J
authors.lastname: Mlynar
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authors.initials: G
authors.lastname: Van Wassenhove
authors.forename: M
authors.initials: M
authors.lastname: Hult
authors.forename: R
authors.initials: R
authors.lastname: González de Orduña
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authors.initials: G
authors.lastname: Lutter
authors.forename: P
authors.initials: P
authors.lastname: Vermaercke
authors.forename: A
authors.initials: A
authors.lastname: Huber
authors.forename: B
authors.initials: B
authors.lastname: Schweer
authors.forename: G
authors.initials: G
authors.lastname: Esser
authors.forename: W
authors.initials: W
authors.lastname: Biel