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APEX Schedule May 25, 2011

APEX Schedule May 25, 2011. Ramp. Injection. Injection. Store. Store. Store. Local decopling Zimmer, Vadim, Bai. Beam-beam Space charge Alexei. BBA Minty, Jordan, Liu, Rob, Rob. Dynamic beta* knob GRD, Al. 10 Hz GOFB for Ramp Minty, Liu, Rob, Rob, GRD.

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APEX Schedule May 25, 2011

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  1. APEX Schedule May 25, 2011 Ramp Injection Injection Store Store Store Local decopling Zimmer, Vadim, Bai Beam-beam Space charge Alexei BBA Minty, Jordan, Liu, Rob, Rob Dynamic beta* knob GRD, Al 10 Hz GOFB for Ramp Minty, Liu, Rob, Rob, GRD Off momentum beta beat measurement/correction Calaga, White, Luo, Bai Local decoupling Zimmer, Vadim Bai Back2Physics IP Transfer Matrix Tepikian, Ptitsyn Q1 modulation for beta* Yun, Al 8pm 8am 10am 12pm 2pm 5pm 6pm 12am 11pm

  2. Overview • All 8 studies were carried out. Most went smoothly • 3 out 8 studies didn’t get data due to technical problems • Beam-beam and space charge: required to make a tune change of 0.1, which was too much change for injection damper to function properly without re-configuration (?) • Dynamic beta* squeeze: the mis-communication of what state of RF should be when measure chromaticity at store with both beams caused a few mm radius lurch, which not only dumped the beam but also induced quench in several Ips. The recovery from magnet quench also disabled the local-decoupling at store as well as blue IP map study • Off-momentum beta-beat study was also impaired due to the noisy behavior of BBQ. This may be due to the fact that machine tune was set too close to one of the main harmonics (?)

  3. Local Decoupling: C. Zimmer • Spend a total of 3 hours taking data at injection • Finished both IP6 and IP8 for both rings • Applied local H bump at each triplet and measured the resulted V closed orbit distortion • Vice-versa • Data analysis is in progress

  4. 10 Hz GOFB for Ramping • PI: Chuyu Liu, M. Minty, Rob M, Rob H microns Transition Rebucket 3 power supplies tripped End of ramp Power supply recovery Start of ramp Black Trace: ramp with 10 Hz feedback OFF Blue Trace: ramp with 10 Hz feedback ON

  5. Measure Beta* by modulating Q1: Yun, Al 1A modulation of Q1 , frequency 0.2Hz, during 20 seconds

  6. Measure Beta* by modulating Q1: Yun, Al One example of measured beta* • On the high side, could be due to • the following error sources • 10 Hz tune oscillation contributed about • 4% error. this can be filtered out • calibration of the Q1 modulating current • Q1 set current is about 5040A. Needs to • make sure the modulating current within 5%.

  7. Plan for Next APEX Session • Dry-run of CeC PoP 40 GeV ramp during maintenance: Don Bruno • IP2 beta* 5.5m at store • Beam-beam and space charge at injection • Injection without damper • Local decoupling at store: 2hours • Varied Q1, Q2 and QS • IP map: 2 hours • Off-momentum • Explore transverse aperture limit at IP2 at injection • Proof of Principle of Coherent electron Cooling • Spin flipper • Measure DSA response with AC dipole bumps on but sweeping frequency • BBA

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