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New hysteresis cycle for low energy operation C. Liu Mar. 16, 2018 - PowerPoint PPT Presentation

New hysteresis cycle for low energy operation C. Liu Mar. 16, 2018 New cycle vs. old cycle Current (181.593A) at which we inject and collide beams. old new History P. Thieberger proposed a new hysteresis in 2012 APEX workshop to reduce


  1. New hysteresis cycle for low energy operation C. Liu Mar. 16, 2018

  2. New cycle vs. old cycle Current (181.593A) at which we inject and collide beams. old new

  3. History • P. Thieberger proposed a new hysteresis in 2012 APEX workshop to reduce high harmonics from RHIC dipole. • P. Wanderer mentioned a modeling of RHIC dipole by Dr. Wang from LBL. http://accelconf.web.cern.ch/AccelConf/napac2016/papers/mopob49.pdf • Dr. Wang is working on the modeling of new hysteresis cycles. • A new hysteresis cycle is being considered for the fixed target program at 3.85GeV in 2018.

  4. Potential benefits • Reduce the high harmonics of the dipole magnets. • Improve the reproducibility of the dipole magnetic field. • Reduce the field contribution of the persistent current.

  5. Plan • Run new hysteresis, machine tuning, make measurements (orbit, tune, chrom) for drift correction to be compared with that at injection energy during normal operation. • Run hysteresis again, make measurements to quantify machine reproducibility. • ~5 hrs.

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