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A 70keV 40A hydrogen beam injector has been developed at Cadarache for a plasma diagnostic [motional Stark effect (MSE)] to provide a measurement of the plasma current distribution in the Tore-Supra tokamak. We present in this article the principle and the first experimental results of the injector, where a new type, and advantageous, energy recovery system, based on a magnetic neutraliser plasma confinement, has been developed. The hydrogen ion beam is accelerated to 70keV with a three-grid multiaperture system (aperture diameter [Phi]=11mm) with an ion current density of ~160mA/cm{2}. An ion source with a shape (height 1.2m, width 80mm) specifically adapted to the recovery system has been developed to meet the injector requirements: uniformity, high proton fraction (>80%), and high current density, ~160mA/cm{2} over the whole extraction surface (900cm{2}). A neutral (H{0}) beam power of 500kW has been achieved with a divergence of ~0.6° at 70keV.

Additional information

Authors: SIMONIN A ET AL, Association EURATOM-CEA, CEA Cadarache, Saint-Paul-Lez-Durance (FR);FAZILLEAU P, Dapnia, CEA Saclay, Gif sur Yvette (FR)
Bibliographic Reference: An article published in: Review of Scientific Instruments, August 2002, Volume 73, Issue 8, pp.2886-2889
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