1 / 12

IR corrections April 1 st 2009

IR corrections April 1 st 2009. Fulvia Pilat APEX Meeting, April 3, 2009. APEX Schedule March 31 - April 1 2009. Store rot93 12x12 ramp BBQ. Store rot93 6x6 ramp. Injection. Injection. No beam pp93lowbeta. Driven Triplet Oscillations measurement Minty Thieberger.

ocean
Download Presentation

IR corrections April 1 st 2009

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. IR correctionsApril 1st 2009 Fulvia Pilat APEX Meeting, April 3, 2009

  2. APEX Schedule March 31 - April 1 2009 Store rot93 12x12 ramp BBQ Store rot93 6x6 ramp Injection Injection No beam pp93lowbeta Driven Triplet Oscillations measurement Minty Thieberger Test of beta*=0.5m ramp Bruno Tepikian 09-22 Spin tune vs. orbit Ptitsyn, Bai 08-27 Optics, beta* measurements Bai 09-05 D0-DX study MacKay OPERATIONS IR nonlinear corrections Pilat 8pm 10:30pm 00:30am 3:30am 6am 8am AGS OFF

  3. intro • Normal sextupole and skew sextupole in the IR6 and IR8 triplets gets readjusted during the set-up phase. Blue got adjusted several week ago, yellow slipped during set-up and ramp-up, and was canceled in the last 2 APEX sessions due to down-time • 12x12 rotator ramp, no Artus, IPM, BBQ on the ramp, anticogged (blue used by driven triplet oscillation study) • Check/fix orbit, coupling, separate tunes >0.012 • Take BBQ tune data as a function of bump amplitude (IR bumps for sextupole correction span both triplets) horizontal bump  normal sextupole vertical bump  skew sextupole 1 normal and 1 skew sextupole per triplet available to correct correctors at bxmax affect mostly the H-tune, at bymax mostly the V-tune, not quite orthogonal knobs but close Nice operational instructions by Chris Zimmer: http://www.cadops.bnl.gov/AGS/Operations/docum/NLOCorrection.html Instructions are also in OpsWiki under the name 'IRBump‘ Sev/Chris working on automation of correction

  4. Coupling atyellow rot store • Found large (~0.08) coupling at yellow store • Tried Decoupling application (did not come up) • BBQ coupling monitor did not work well • Ended up doing manual decoupling (y-sq2 family ~0.9  large)

  5. Beam decay Successive correction steps

  6. IR8normalsextupole

  7. IR8 skew sextupole

  8. IR6:normalsextupole

  9. IR6:skewsextupole drift BTF measurement jumps bump bump

  10. Corrector settings

  11. Effect on tune ripple (Michiko)

  12. Conclusions • Blue and yellow IR corrections done • BBQ data quality improved by averaging • Reduced tune ripple at store • Can do better if needed (time went to deal with coupling and BBQ issues) ~2h (Dev or APEX) could get us down to 0.0001 • May help on luminosity and polarization • Still dreaming to get time to work on octupole and higher orders…..

More Related