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Final scientific report on Contract No: FU05-CT-2000-50001.

The main topic of this contract is the implementation of the Cavity Ringdown Spectroscopy (CRS) technique proposed for quantitative measurement of negative H- and D- densities in the Kamaboko III ion source on the MANTIS test bed in the DRFC, CEA Cadarache. MANTIS is used for the development of high-density negative ion current beams for use in NBI systems in proposed nuclear fusion reactors. The source used at MANTIS is a scale version of the source designed for the ITER neutral beam injection system called the Kamaboko III ion source. The target performance for the KAMABOKO ion source on the MANTIS test bed is to accelerate a beam of D- with a current density of 200 A/m2 and <1 electron extracted per accelerated D- ion, at an injected power ranging between 1 and 2 kW per litre of source volume and a source pressure of 0.3 Pa.

This report outlines the performance of the KAMABOKO source when operated in caseiated mode. The effect of plasma grid temperature, Cs seeding, Cs consumption, and long pulse, 1000 s, beam extraction are discussed. Limitations observed with the MANTIS system are identified and further objectives outlined. The CRS experiment was implemented in parallel to the main MANTIS experiments, i.e. source development to achieve better source efficiency and higher current densities. It was proposed that by determining the quantitative densities of negative ions in the discharge optimum-operating conditions could be determined and the overall performance improved.

Additional information

Authors: BOILSON D, Association EURATOM-CEA, Departement de Recherches sur la Fusion Contrôlée, CEA Cadarache, Saint Paul Lez Durance (FR)
Bibliographic Reference: CEA Cadarache report no. EUR-CEA-FC-1730, 72pp. Free of charge Available online at:
Availability: Paper version 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.
Record Number: 200316224 / Last updated on: 2003-04-29
Original language: en,fr
Available languages: en,fr