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Energy recovery experiments have been conducted for the first time with a negative ion based neutral beam injector. A new type of energy recovery system was utilised, which: (i) separates electrostatically the neutrals and charged components of the beam at the exit of the neutraliser; (ii) decelerates the residual unneutralised negative ions; (iii) prevents secondary emission of electrons from the negative ion collector by means of electrostatic trapping. With 102 keV, 1.2 A D(-) beams, the residual negative ions were decelerated with high efficiency down to 8 keV: even when the additional power consumption of the electrostatic deflector was taken into account, the efficiency of recovery of the residual negative ion power was as good as 81 %. The energy recovery system operation is shown to be rather insensitive to the background gas pressure in a range of values relevant for the injector operation.

Additional information

Authors: PAMÉLA J, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);FUMELLI M, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);JEQUIER F, CEA, 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: Article: Nuclear Instruments and Methods in Physics Research B, Vol. 73 (1993) pp. 296-302
Record Number: 199310591 / Last updated on: 1994-11-29
Original language: en
Available languages: en