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Definition of the radiation fields for the JET gamma-ray spectrometer diagnostics (Articolo in rivista)

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Definition of the radiation fields for the JET gamma-ray spectrometer diagnostics (Articolo in rivista) (literal)

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Vasile Zoita; Sorin Soare; Teddy Craciunescu; Marian Curuia; Vasily Kiptily; Nick Balshaw; Patrick Blanchard; David Croft; Andrea Murari; Brian Syme; JET-EFDA contributors (2013)
Definition of the radiation fields for the JET gamma-ray spectrometer diagnostics
in Fusion engineering and design; ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE (Svizzera); ELSEVIER SCIENCE B.V., AMSTERDAM (Paesi Bassi)
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Vasile Zoita; Sorin Soare; Teddy Craciunescu; Marian Curuia; Vasily Kiptily; Nick Balshaw; Patrick Blanchard; David Croft; Andrea Murari; Brian Syme; JET-EFDA contributors (literal)

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Available online 17 February 2013, E-ISSN 1873-7196. Proceedings of the 27th Symposium On Fusion Technology (SOFT-27); Liège, Belgium, September 24-28, 2012 (literal)

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1,7,9 : EFDA-JET CSU Culham, Culham Science Centre, Abingdon, UK; / 1,3 : Association EURATOM-MEdC, National Institute for Laser, Plasma and Radiation Physics, Bucharest, Romania; / 2,4 : Association EURATOM-MEdC, National Institute for Cryogenics and Isotope Technologies, Rm. Valcea, Romania; / 5,6,8,10: Association EURATOM-CCFE, Culham Science Centre, Abingdon, UK; / 7 : Association EURATOM-CRPP-EPFL, Lausanne, Switzerland; / 9 : Association EURATOM-ENEA, RFX, Padova, Italy. (literal)

Titolo

Definition of the radiation fields for the JET gamma-ray spectrometer diagnostics (literal)

Abstract

The JET gamma-ray diagnostics system provides information on the behaviour of fast particles within the tokamak plasma. Information on the spatial distribution of the interacting fast particles is obtained from the gamma-ray cameras, while energy distribution information is provided by gamma-ray spectrometers. These techniques have been successfully applied so far in fast particle simulation experiments at JET. The extension of these diagnostics to high performance discharges with high neutron yields is not straightforward due to the background gamma-ray emission induced by neutrons. Two gamma-ray diagnostics upgrade projects at JET addressed this issue by developing neutron/gamma radiation filters (\"neutron attenuators\") and collimators for a proper definition of the radiation (neutron and gamma) fields along the diagnostics line-of-sight. A pair of neutron/gamma collimators working in a tandem configuration have been designed and constructed for the JET quasi-tangential gamma-ray spectrometer. The tandem collimators were designed to provide shielding factors of about 5 × 10E2 for 2.45 MeV neutrons and about 10E3 for 9 MeV gamma-rays. The devices have been installed on the JET machine and the paper presents the first experimental results. A similar tandem collimator system was designed for deuterium-tritium experiments on JET. The results of neutron-photon transport calculations for 14.1 MeV neutrons are also presented. (literal)

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