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| THP06 |
Recent Ion Source Developments for VARIAN's ProBeam® Cyclotron |
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- S. Busold, H. Röcken
VMS-PT, Troisdorf, Germany
- A.S. Partowidjojo, J.M. Schippers
PSI, Villigen PSI, Switzerland
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The cold cathode Penning ionization gauge (PIG) type proton source of the VARIANÂ’s ProBeam® 250 MeV superconducting isochronous cyclotron suffers from the usual cathode/chimney erosion during operation. Furthermore, a relatively high hydrogen gas flow is needed to generate a proton beam in the μA range, which induces conditions for RF operation below optimum. In the quest to increase cathode/chimney life time and thereby directly extend service intervals, thus reducing the total cost of ownership, several experimental investigations have been performed at a dedicated test bench at PSI, Switzerland, including material studies, a detailed operation analysis and switching to a hot cathode design.
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