DEVELOPMENT OF A HIGH-CURRENT H- SOURCE FOR EUROPEAN SPALLATION SOURCE

For the European spallation source, a volume source based on the high efficiency source is being developed. The source will be optimized to produce high current densities in pulsed operation. A pulse generator delivering 1-1.5 ms pulses was installed. Furthermore, cesium was supp lied to the plasma generator from an external oven. The cesium injecti on was optimized for a low e/H- ratio and a high current. We obtained a current density of 70 mA/cm(2). This way, with an aperture radius of 4.25 mm, an H- current of 40 mA was extracted at an extraction voltag e of 22 kV. After a description of the source and the experimental set up, measurements of the beam current density and the e/H- ratio will b e presented in this article. (C) 1998 American Institute of Physics.