Keyword: survey
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WEP018 Optics Error Measurements in the AGS for Polarized Proton Operation quadrupole, sextupole, betatron, closed-orbit 1534
 
  • V. Schoefer, L. A. Ahrens, K.A. Brown, J.W. Glenn, H. Huang
    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.
A large distortion of the vertical beta function became evident in the Brookhaven AGS during the 2010 polarized proton run. This paper describes the beam measurements and model calculations made to verify the distortion of the optics, to infer possible sources and to explore correcting strategies. The optics distortion is only apparent when operating with a betatron tune very near the integer (as required for polarization preservation during acceleration in the AGS) and with the lattice chromaticity sextupoles powered. The measurements indicate a small (on the order of millimeters) unexpected systematic horizontal closed orbit displacement in the sextupoles that is not evident in beam position monitor measurements. Motivated especially by these observations a complete survey of the AGS was performed during the 2010 shutdown period.&nb sp; The results of that survey and their impact on the observed optical errors in the AGS are included.
 
 
THP108 Analysis of RHIC Beam Dump Pre-fires radiation, high-voltage, kicker, secondary-beams 2327
 
  • W. Zhang, L. A. Ahrens, W. Fischer, H. Hahn, J.-L. Mi, J. Sandberg, Y. Tan
    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.
It has been speculated that the beam may cause instability of the RHIC Beam Abort Kickers. In this study, we explore the available data of past beam operations, the device history of key modulator components, and the radiation patterns to examine the correlations.
 
 
FROBS1 World-wide Experience with SRF Facilities SRF, cryomodule, vacuum, cavity 2575
 
  • A. Hutton, A. Carpenter
    JLAB, Newport News, Virginia, USA
 
  The speaker will review and analyze the performance of existing SRF facilities in the world, addressing issues of usage and availability for different customers (HEP research, material sciences, ADS). Lessons learned should be summarized for proposed future facilities (ILC, ProjectX, Muon Collider).  
slides icon Slides FROBS1 [5.473 MB]