Keyword: cathode
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PO10 Performance of ALPI New Medium Beta Resonators cavity, vacuum, pick-up, superconductivity 73
  • A.M. Porcellato, F. Chiurlotto, M. De Lazzari, A. Palmieri, V. Palmieri, S. Stark, F. Stivanello
    INFN/LNL, Legnaro (PD), Italy
  All the Nb sputtered medium beta cavities installed up to the last year in ALPI were produced by upgrading of old previously Pb plated substrates. For the first time this year we had the opportunity to test on line four 160 MHz, β=0.11 QWRs which were designed and built in order to be Nb sputtered. These resonators were sputtered in between 2007 and 2008 and they were tested at low fields (up to 3 MV/m) just after their production when they showed Q-zero values exceeding 1xE9. They were then stored for about three years in plastic bags and installed in ALPI only this year. The on line tests that we performed after installation showed Q-zero values reduced of about a factor five with respect to the ones measured in laboratory. It is the first time we could pick out a Q deterioration caused by storage in air. So far we have not recognized any Q–degradation both when the sputtered cavities were maintained in vacuum for many years and also when they were open to air for a few weeks for cryostat maintenance. In such a case, as it happened in the maintenance of cryostat CR19 housing high beta resonators, we could instead find some improvements in the Q-curves.  
WEB02 Commissioning of CARIBU EBIS Charge Breeder Sub-systems gun, electron, ion, solenoid 165
  • S.A. Kondrashev, C. Dickerson, A. Levand, P.N. Ostroumov, R.C. Vondrasek
    ANL, Argonne, USA
  • M.A. Batazova, G.I. Kuznetsov
    BINP SB RAS, Novosibirsk, Russia
  • A.I. Pikin
    BNL, Upton, Long Island, New York, USA
  Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under contract number DE-AC02-06CH11357.
A high-efficiency charge breeder based on an Electron Beam Ion Source (EBIS) to increase the intensity and improve the purity of accelerated neutron-rich radioactive ion beams is being developed by the ANL Physics Division. The design of the EBIS charge breeder is complete and manufacturing of the components and sub-systems is in progress. A 6-Tesla superconducting solenoid and a high-perveance electron gun were recently delivered and successfully commissioned. The current status of the ANL EBIS development and commissioning results of different EBIS sub-systems will be presented.
slides icon Slides WEB02 [1.219 MB]