http://www.cnr.it/ontology/cnr/individuo/prodotto/ID188776

Tandem collimators for the JET tangential gamma-ray spectrometer (Articolo in rivista)

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Tandem collimators for the JET tangential gamma-ray spectrometer (Articolo in rivista) (literal)

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Sorin Soare; Nick Balshaw; Patrick Blanchard; Teddy Craciunescu; David Croft; Marian Curuia; Trevor Edlington; Vasily Kiptily; Andrea Murari; Phil Prior; Steven Sanders; Brian Syme; Vasile Zoita; JET EFDA Contributors (2011)
Tandem collimators for the JET tangential gamma-ray spectrometer
in Fusion engineering and design; ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE (Svizzera)
(literal)

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Sorin Soare; Nick Balshaw; Patrick Blanchard; Teddy Craciunescu; David Croft; Marian Curuia; Trevor Edlington; Vasily Kiptily; Andrea Murari; Phil Prior; Steven Sanders; Brian Syme; Vasile Zoita; JET EFDA Contributors (literal)

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La rivista è pubblicata anche online con ISSN 1873-7196 (Editore: Elsevier Science SA) (literal)

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a. Association EURATOM-MEdC, National Institute for Cryogenics and Isotopic Technologies, Rm. Valcea, Romania; b. Association EURATOM-CCFE/JOC, Culham Science Centre, Abingdon, UK; c. Association EURATOM-CRPP-EPFL, Lausanne, Switzerland; d. Association EURATOM-MEdC, National Institute for Laser, Plasma and Radiation Physics, Bucharest, Romania; e. Association EURATOM-ENEA, RFX, Padova, Italy. (Sorin Soare a , Nick Balshaw b , Patrick Blanchard c , Teddy Craciunescu d , David Croft b , Marian Curuia a , Trevor Edlington b , Vasily Kiptily b , Andrea Murari e , Phil Prior b , Steven Sanders b , Brian Syme b , Vasile Zoita d) (literal)

Titolo

Abstract

The tangential gamma-ray spectrometer (TGRS) of the JET tokamak fusion facility is an important diagnostics for investigating the fast particle evolution. A well defined field of view for the TGRS diagnostics is essential for its proper operation and this is to be determined by a rather complex system of collimators and shields both for the neutron and gamma radiations. A conceptual design for this system has been carried out with the main design target set to maximize the signal-to-background ratio at the spectrometer detector, the ratio being defined in terms of the plasma emitted gamma radiation and the gamma-ray background. As a first phase of the TGRS diagnostics upgrade a set of two tandem collimators has been designed with the aim of determining a quasi-tangential field of view through JET tokamak plasmas. A modular design of the tandem system has been developed in order to allow for the construction of different configurations for deuterium and deuterium-tritium discharges. The internal structure of the collimators consists of nuclear grade lead and high density polyethylene slabs arranged in an optimized pattern. The performance of a simplified geometry of the tandem collimator configuration has been evaluated by neutron and photon transport calculations and the numerical results show that the design parameters can be attained. (literal)

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