The Frankfurt 200 mA proton source

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  • R. Hollinger
    Institut für Angewandte Physik, Universität Frankfurt, 60054 Frankfurt, Germany
  • P. Beller
    Institut für Angewandte Physik, Universität Frankfurt, 60054 Frankfurt, Germany
  • K. Volk
    Institut für Angewandte Physik, Universität Frankfurt, 60054 Frankfurt, Germany
  • M. Weber
    Institut für Angewandte Physik, Universität Frankfurt, 60054 Frankfurt, Germany
  • H. Klein
    Institut für Angewandte Physik, Universität Frankfurt, 60054 Frankfurt, Germany

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<jats:p>For the International Fusion Materials Irradiation Facility (IFMIF) scenario, a 140 mA deuterium beam in continuous wave (cw) mode with an atomic yield of above 85% is required. The normalized root-mean-square emittance should be less than 0.2 π mm mrad at the entrance of a RFQ. As part of a conceptual design for IFMIF, a new ion source has been developed and is tested at the Institut für Angewandte Physik in Frankfurt. The ion source is of the volume type with a tungsten cathode driving the discharge. Both cw and pulsed mode are possible and were studied. First experiments were carried out with deuterium. 80 mA deuterons with a D+ fraction of above 90% were extracted [A. Maser et al., Rev. Sci. Instrum. 67, 1054 (1996)]. In order to avoid neutron generation by the d–d reaction, hydrogen was used instead of deuterium later on. As far as the ion source and plasma production processes are concerned, the use of hydrogen instead of deuterium is equivalent because of their similar atomic shells. Recently, a 200 mA proton beam at 55 kV was extracted in cw mode (according to Child–Langmuir, 200 mA H+ corresponds to 140 mA D+) with a H+ fraction of 93%. This article will give a detailed description of the ion source and the essential experimental results. Especially, the influence of important physical parameters (such as discharge current and strength of the filter field) on the H+ fraction was studied. By using different kinds of auxiliary gases, the influence on the H+ fraction and the noise level were investigated, too.</jats:p>

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