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Abstract

In a joint CEA-JAERI experiment performed at Cadarache, D(-) and H(-) beams have been studied at 100 keV energies in long pulses. In pure volume production, 0.5 A of D(-) and 0.92 A of H(-) ions accelerated at 100 keV have been transmitted onto a narrow target (13 cm wide, at 3 m distance). With caesium seeding in the plasma generator, more than 2 A of D(-) have been accelerated at 100 keV of energy and a calorimetric target signal as high as 1.85 A of D(-) has been obtained. Caesium seeding also allowed the operating pressure to be reduced by a factor of 1/5 and extracted electrons by a factor of 1/2. These results constitute significant progress in the development of D(-) beams in view of ITER NB requirements. This experiment has also been used to study beam optics in various conditions, which will be useful to validate negative ion extraction codes. Some features, like edge effects observed in a large aspect ratio accelerator and good results obtained with beamlet merging, may provide valuable information for the design of the ITER D(-) beam accelerator.

Additional information

Authors: PAMELA J, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);FUMELLI M, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);JEQUIER F, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);HANADA M, JAERI, Naka-gun, Ibaraki-ken (JP);OKUMURA Y, JAERI, Naka-gun, Ibaraki-ken (JP);WATANABE K, JAERI, Naka-gun, Ibaraki-ken (JP)
Bibliographic Reference: Paper presented: IAEA Technical Committee Meeting on Negative Ion Based Neutral Beam Injector, Naka (JP), Nov. 11-13, 1991
Availability: Available from (1) as Paper EN 36476 ORA
Record Number: 199210466 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en
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