Energy recovery experiments with a powerful 100 keV D(-) based neutral beam injector
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 have been decelerated with high efficiency down to 8 keV. By taking into account the power consumption of the electrostatic deflector, the efficiency of recovery of the residual negative ion power was as good as 81 %, at a background gas operating pressure of around 1.0 E-3 Pa.
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 37021 ORA
Record Number: 199211525 / Last updated on: 1994-11-29
Original language: en
Available languages: en