Production of Negative D exp - Ions by Double Charge Exchange Using Cesium

摘要

The first experimental results on the source of D exp - negative ions developed at SIG confirm a certain number of essential points: (1) the use of a positive ion source obtained by a resonance electronic cyclotron permits the production of D exp + ion beams with a very small gas output, therefore it has a very good gas efficiency; (2) the supersonic cesium target obtained after the release of a high temperature cesium vapor functions perfectly with the desired characteristics; (3) the conversion efficiency measured in D exp - ions is close to those which were deduced from experimental cross sections; and (4) the mean density of D exp - ion currents is on the order of 10 mA/cm exp 2 at 1 keV. They could be 15 at 25 mA/cm exp 2 at 300 eV. This presupposes that we modify the extraction optic for the D exp + ions to extract 60 at 70 mA/cm exp 2 of D exp + at 300 eV with a maximum electric field of 30 DV/cm and a greater perveance of the optic. (ERA citation 09:004225)