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The neutral, positive and negative beam components have been measured at the exit of the gas neutraliser of a powerful D(-)/H(-) injector. Their relative fractions have been studied as a function of the neutraliser gas target thickness. These experiments used a diagnostic consisting of a large electrostatic deflector and three calorimetric targets. Measurements have been performed for the first time with high power D(-) and H(-) beams (up to 200 kW, multi-second pulses). The negative ion beam energy was varied from 25 to 100 keV/nucleon. The results are in agreement with the theoretical predictions derived from cross-section data. They confirm, in particular, that negative ion neutralisation efficiencies of about 60 % can be obtained at 100 keV/nucleon.

Additional information

Authors: JEQUIER F ET AL., CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);HANADA M ET AL., JAERI, Naka-gun, Ibaraki-ken (JP)
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 37022 ORA
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