Pure volume production of negative ions from a large multi-cusp "TENT" filter sourceFunded under: EAEC-FUSION 12C
Reliable large current and high current density hydrogen and deuterium negative ion sources are investigated on the MANTIS test bed at the Euratrom CEA laboratory, with the objective of producing several amperes of D(-) beams, at an accelerated current density in the range of 10-20 mA/cm2, for possible application in future neutral beam injectors. The DRAGON source, which was built by Culham Laboratory was installed on the MANTIS test bed in order to test this large source using only pure volume production of negative ions. The accelerated negative ion current was found to be a strong function of the source operating pressure and the arc power, and a significant isotopic effect was observed. Large electron currents were extracted: 5 to 6 electrons per H(-) and up to 25 to 30 electrons per D(-). The magnetic field across the extraction array played an important role in determining the accelerated current, whereas changing the electron confinement in the source caused a negligible change. Reasons for the isotopic effect are discussed and it is suggested that the data presented support the hypothesis that the negative ions extracted from the source are created close to the point of extraction.
Bibliographic Reference: Report: EUR-CEA-FC-1543 EN (1995) 31 pp.
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Record Number: 199511435 / Last updated on: 1995-11-03
Original language: en
Available languages: en