Author: Freyberger, A.
Paper Title Page
MOPPR087 Transverse Beam Emittance Measurements of a 16 MeV Linac at the Idaho Accelerator Center 990
  • S. Setiniyaz, T.A. Forest
    ISU, Pocatello, Idaho, USA
  • K. Chouffani, Y. Kim
    IAC, Pocatello, IDAHO, USA
  • A. Freyberger
    JLAB, Newport News, Virginia, USA
  A beam emittance measurement of the 16 MeV S-band High Repetition Rate Linac (HRRL) was performed at Idaho State University's Idaho Accelerator Center (IAC). The HRRL linac structure was upgraded beyond the capabilities of a typical medical linac so it can achieve a repetition rate of 1 kHz. Measurements of the HRRL transverse beam emittance are underway that will be used to optimize the production of positrons using HRRL's intense electron beam on a tungsten converter. In this paper, we describe a beam imaging system using on an OTR screen and a digital CCD camera, a MATLAB tool to extract beamsize and emittance, detailed measurement procedures, and the measured transverse emittances for an arbitrary beam energy of 15 MeV.  
TUPPR055 Upgrading the CEBAF Injector with a New Booster, Higher Voltage Gun, and Higher Final Energy 1945
  • R. Kazimi, A. Freyberger, F.E. Hannon, A.S. Hofler, A. Hutton
    JLAB, Newport News, Virginia, USA
  Funding: Authored by JSA, LLC under U.S. DOE Contract DE-AC05- 06OR23177. The U.S. Govt. retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce this for U.S. Govt. purposes.
The CEBAF accelerator at Jefferson Lab will be upgraded from 6 GeV to 12 GeV in the next few years. To meet the requirement of the new machine and also to take the opportunity to improve the beam quality, the CEBAF injector will be upgraded with a higher voltage gun, a new booster, and a new accelerating RF module. The CEBAF injector creates and accelerates three beams at different currents simultaneously. The beams are interleaved, each at one third of RF frequency, traveling through the same beam line. The higher voltage gun will lower the space charge effects making it easier to operate at different current with the same setup. The new booster with optimized beam dynamics will complete the bunching process and provides initial acceleration matched to the new gun voltage. Using our latest SRF design, the new booster has significantly lower XY coupling effects that should improve our beam setup and operation for the highly sensitive parity experiments scheduled for the CEBAF’s future. Finally, the new accelerating RF module will roughly double the injector final energy to match the rest of the 12 GeV accelerator. In this paper we will provide more detail about this upgrade.