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TY - CONF AU - Busold, S. AU - Partowidjojo, A.S. AU - Röcken, H. AU - Schippers, J.M. ED - Chrin, Jan ED - Schaa, Volker RW TI - Recent Ion Source Developments for VARIAN's ProBeam® Cyclotron J2 - Proc. of Cyclotrons2016, Zurich, Switzerland, September 11-16, 2016 C1 - Zurich, Switzerland T2 - International Conference on Cyclotrons and Their Applications T3 - 21 LA - english AB - 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. PB - JACoW CP - Geneva, Switzerland SP - 316 EP - 318 KW - cathode KW - ion KW - ion-source KW - cyclotron KW - operation DA - 2017/01 PY - 2017 SN - 978-3-95450-167-0 DO - 10.18429/JACoW-Cyclotrons2016-THP06 UR - http://jacow.org/cyclotrons2016/papers/thp06.pdf ER -