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The acceleration of D(-) and H(-) beams has been studied at energies of up to 105 keV, with currents of the order of 2 A, in multi-second pulses. The optimum extraction voltage has been studied as a function of the beam energy and current. The purveyance of the negative ion accelerator has been measured over a wide range of operating conditions with H(-) and D(-) beams. The experimental results have been compared to beam optics calculations performed with the SLACAD negative ion code developed at Cadarache: a good agreement has been found. Strong perturbations of negative ion beamlet trajectories have been evidenced in the case of large gap, large aspect ratio accelerators. A comparison between merged beamlets and multi-hole accelerators has been performed. The observed linear increase of the stray accelerated electron current with the extraction voltage has been explained by simulation with a Monte-Carlo code developed at Cadarache.

Additional information

Authors: PAMELA J 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 37023 ORA
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