Author: Raparia, D.
Paper Title Page
First Operation of the Brookhaven EBIS as the Heavy Ion Preinjector for RHIC  
  • J.G. Alessi, E.N. Beebe, A.I. Pikin, D. Raparia
    BNL, Upton, Long Island, New York, USA
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
During the 2012 RHIC run cycle, the EBIS-based heavy ion preinjector provided U39+, Au32+ and Cu11+ ions for the RHIC physics program. The preinjector was operated for ~2.5 months continuously. Intensities delivered to the Booster synchrotron were ~109 U39+ ions/pulse, ~1.5·109 Au32+ ions/pulse, and ~6·109 Cu11+ ions/pulse, in ~20 μs pulses. When providing Au and Cu for asymmetric collisions in RHIC, both species were always available, with a switching time between species of 1 second. The performance and operational experience of this new preinjector will be presented.
THPB051 Improvements at the BNL 200 MeV Linac 969
  • D. Raparia, J.G. Alessi, B. Briscoe, J.M. Fite, O. Gould, V. LoDestro, M. Okamura, J. Ritter, A. Zelenski
    BNL, Upton, Long Island, New York, USA
  After reconfiguration of the low energy (35 keV) and the medium energy (750 keV) transport lines in 2009-10, the Brookhaven linac delivered the highest intensity beam since it was built in 1970 (~120 μA average current of H to the Brookhaven Linac Isotope Producer). It also delivered lower emittance polarized H ion beam for the polarized program at RHIC. To increase the intensity further, the match into the RFQ was improved by reducing the distance from the fnal focusing solenoid to the RFQ and replacing the buncher in the 750 keV line with one with higher Q value, to allow operation at higher power. We also found that drift –tube linac tank number 7 was operating with about 1 MW lower power than design. The transmission efficiencies and beam quality will be discussed in the paper.