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Abstract

A model of the ion source designed for the neutral beam injectors of the International Thermonuclear Experimental Reactor (ITER), the KAMABOKO III ion source, is being tested on the MANTIS test stand at the DRFC Cadarache in collaboration with JAERI, Japan, who designed and supplied the ion source. The ion source is attached to a 3 grid 30 keV accelerator (also supplied by JAERI) and the accelerated negative ion current is determined from the energy deposited on a calorimeter located 1.6 m from the source.
During experiments on MANTIS three adverse effects of long pulse operation were found:
- The negative ion current to the calorimeter is ?50% of that obtained from short pulse Operation
- Increasing the plasma grid (PG) temperature results in ?40% enhancement in negative ion yield, substantially below that reported for short pulse operation, ?100%.
- The caesium �consumption� is up to 1500 times that expected.
Results presented here indicate that each of these is, at least partially, explained by thermal effects.
Additionally presented are the results of a detailed characterisation of the source, which enable the most efficient mode of operation to be identified.

Additional information

Authors: BOILSON D, Association EURATOM -DCU, PRL/NCPS, Dublin (IE);ZANIOL B, Associazione Euratom-ENEA sulla Fusione, Consorzio RFX, Padova (IT);HEMSWORTH R S, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);SVENSSON L, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);DE ESCH H P L, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);KRYLOV A, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);MASSMANN P, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);FANZ U, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE)
Bibliographic Reference: An oral paper given at: 10th International Symposium on the Production and Neutralization of Negative Ions and Beams Organised by: Institute of Physics of NAS Ukraine Held at: Institute of Physics of NASU in Kiev (Ukraine)
Availability: Available from Association EURATOM-CEA, Département de Recherches sur la Fusion Contrôlée, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: dirdrfc@drfc.cad.cea.fr
Record Number: 200518138 / Last updated on: 2005-06-06
Category: PUBLICATION
Original language: en
Available languages: en