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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 neutralizer plasma confinement, has been developed. The hydrogen ion beam is accelerated to 70keV with a three-grid multi aperture system (aperture diameter Phi=11mm) with an ion current density of approximately 160mA/cm². 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, approximately 160mA/cm² over the whole extraction surface (900cm²). A neutral (H{0}) beam power of 500kW has been achieved with a divergence of approximately 0.6° at 70keV.

Additional information

Authors: SIMONIN A ET AL, Association Euratom-CEA, CEA/DSM/DRFC, 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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