APEX Schedule May 11, 2011

1. APEX Schedule May 11, 2011 Injection Injection Store Store Store On/Off momentum beta beat, and beta* measurement Calaga, White, Luo, Bai Spin Flipper Bai, Pablo, Oddo, Craig, Kevin BBA Minty, Jordan, Liu, Rob, Rob, Kevin, … ORM for GOFB Minty, Liu, Rob, Rob, Kevin, … IPM calibration R. Connolly, Minty, Marusic IPM calibration R. Connolly, Minty, Marusic IP Transfer Matrix Tepikian, Ptitsyn 12am 1am 2am 5am 6am 8am

2. IPM Channel2Channel Calibration • PI: R. Connolly, M. Minty, S. Tepikian • Confirmed that the emittance dependence on beam position at IPM, i.e. separation bumps at IP2 was due to the gain depletion of the MCPs at the center of the measurement aperture

3. IPM Channel2Channel Calibration Uncorrected data and indicates a vertical beam size increase of 16% or emittance increase of 35% when bump is removed Same data with gain and offset corrections. Now the size change is 5%, about the scatter in shot-shot measurements

4. Blue Spin Flipper Commissioning: M. Bai, P. Oddo, C. Dawson, T. Roser, P. Pile, … 1st ac dipole bump 2nd ac dipole bump both ac dipole bumps

5. Blue Spin Flipper Commissioning: M. Bai, P. Oddo, C. Dawson, T. Roser, P. Pile, … Each individual ac dipole DSA response • Conclusion: • H DSA response is due • to the difference of roll • of each ac dipole • took both 1024 turn • by turn bpm data and • million turn bpm data • for all cases. Offline • analysis to extract • the roll of each • ac dipole #2 #4 #5 #1

6. BBA Reproducibility: M. Minty, J. Ziegler,… • May 2, In Yellow ring with 9GeV Au beam • May 11, In Blue ring with 100 GeV Au beam • Checked stability of quadrupole power supply • Yi6-qf3-ps is stable from tune data • Checked stability of corrector power supplies • Yo5-tv3, yi6-tv2 and yi6-tv4 current reproducibility reaches the power supply regulation specs, i.e. +-50A/2^12= 24 mA • reproducibility of bump settings are limited by corrector power supply controller resolution

7. BBA Reproducibility

8. Measure Twiss and Coupling • PI: S. Tepikian, V. Ptitsyn

9. Measure Twiss and Coupling • Yellow Ring IP6 • Varied Q1, Q2 and QS • Beta*: 0.875m Horizontal, 0.878m vertical • Yellow Ring IP8 • Varied Q1, Q2 and QS • Beta*: 0.923m Horizontal, 0.919m Vertical • Plan • Need to compare this with the analysis of coupling-free to demonstrate the effect of coupling on beta* measurement • Repeat yellow measurement with better vertical tune measurements • Measure blue ring IPs

10. Effect of Measured ORM for GOFB • PI: Chuyu Liu, M. Minty, Rob M, Rob H

11. Effect of Measured ORM for GOFB With model matrix With measured matrix Frequency domain Time domain

12. Off Momentum Beta Beat • PI: R. Calaga, Y. Luo, S. White, M. Bai • ~40% chromatic beta beat was observed during 250 GeV pp run in 2009 • Two correction techniques: • adjust phase advance between IP6 and IP8: R. Calaga • correct non-linear chromaticity: Y. Luo • Measured on-momentum optics • ~ 20% beta beat(peak) in both rings • Blue beta* Yellow: • first attempt of radial steering killed beam • orbit xmean wasn’t properly zeroed before activating radial steering

13. Off Momentum Beta Beat

14. 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