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It is proposed to conduct on the Cadarache neutral beam test bed an experiment with the following characteristics: 1 MeV, 0.1 A, D(-), long pulses (several seconds). This experiment will deal with several ITER neutral beam relevant subjects, which are critical but still not properly explored: (i) development of scalable high-energy (up to 1 MeV) D(-) accelerator concepts, with current densities in the 10 mA/cm2 range, adequate optical quality and suppression of stray particles (electrons, etc.): a simplified concept of accelerator, SINGAP, will be compared to a multi-hole multi-gap accelerator; (ii) study of breakdowns in the presence of the beam with a vacuum insulated beamline and effects of a large stored electrostatic energy released during breakdowns (100 Joules range); (iii) development of critical HV devices (large insulator for bushing; decoupling devices for the external stray capacitances; fast protection systems in case of breakdowns). If this proposal is accepted by the European Community at the beginning of 1993, the experiments could start by mid-1994.

Additional information

Authors: FUMELLI M ET AL., CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: 6th Symposium on the Production and Neutralisation of Negative Ions, Brookhaven (US), November 9-13, 1992
Availability: Available from (1) as Paper EN 37027 ORA
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