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APEX Schedule January 20, 2010

APEX Schedule January 20, 2010. 12x12 store. 12x12 store AC dipole. 12x12 store Physics store. 2 ramps. Effect of 0.25 Resonance Yellow tune scan Marr, Schoefer. Correction of vertical dispersion +Check of triplet coupling Ptitsyn Trbojevic. Optics measurements

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APEX Schedule January 20, 2010

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  1. APEX Schedule January 20, 2010 12x12 store 12x12 store AC dipole 12x12 store Physics store 2 ramps Effect of 0.25 Resonance Yellow tune scan Marr, Schoefer Correction of vertical dispersion +Check of triplet coupling Ptitsyn Trbojevic Optics measurements +Chromatic beta functions Bai Wang Beta* unsqueeze Rebucketing +s* adjustment Robert-Demolaize Adjust 2nd order chromaticity in Blue Marr, Schoefer, Yun 8am 11am 2pm 5pm 8pm

  2. High Lights of APEX Studies • Correction of vertical dispersion: Vadim, Dejan, Steve, Yun • Horizontal and vertical dispersion in IR6 and IR8 can be effectively corrected with small orbit angle bumps in those regions. But it did not provided obvious improvement in the momentum aperture.

  3. Matched the H dispersion in IP6 and IP8 to the model High Lights of APEX Studies Reduce the V dispersion from 0.6m to 0.3m

  4. High Lights of APEX Studies • Correction of vertical dispersion: Vadim, Dejan, Steve, Yun • Horizontal and vertical dispersion in IR6 and IR8 can be effectively corrected with small orbit angle bumps in those regions. But it did not provided obvious improvement in the momentum aperture. • The attempt to correct the dispersion at the suspected error sources (IR12 and IR4) was not effective, since quite large orbit distortion or skew quadrupole changes needed to compensate for the dispersion error completely. • The orbit bump data for IR6 and IR8 region in Yellow have been collected to calculate the required local skew quadrupole adjustments in those regions. Local coupling in IR6 looked noticable worse than that in IR8.

  5. High Lights of APEX Studies • Optics Measurement: Gang, Mei • Yellow beta* at store was measured • Chromatic beta beat was also measured for both rings Yellow chromatic beta beam : -0.3mm radial shift

  6. Beta* Measurements (update)

  7. High Lights of APEX Studies • Optics Measurement: Gang, Mei • Yellow beta* at store was measured • Chromatic beta beat was also measured for both rings Blue chromatic beta beam : -0.3mm radial shift

  8. High Lights of APEX Studies • Beta* unsqueeze + s* adjustment: Guillaume • Unsqueezed beta* at IP8 in Yellow from 0.6m to 0.65m. No obvious improvement in beam lifetime • Didn’t have time to do s* adjustment • Adjust non-linear chromaticity in Blue: Greg, Vincent • to cross check the model prediction by Yun. • Chose Blue because Yellow didn’t have enough momentum aperture for such measurement • Tested the 2nd order chromaticity knob.

  9. APEX Schedule January 20, 2010 12x12 store AC dipole 12x12 store 12x12 store ramps 12x12 store Start maintenance Optics Measure AC dipole Bai Wang Optics Measure AC dipole Bai Wang Beta* squeeze +s* adjustment R-Demolaize Nonlinear chromaticity Luo Orbit feedback Minty Marusic IR corrections octupole Zimmer 7pm 8pm 10pm 11pm 2am 5am 6 am AGS OFF 7am

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