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Tevatron Issues and Operations. All Experimenter Meeting Dean Still Monday, February 22, 2010. Collider II Integrated Luminosity. Courtesy: RunCo Team 0900 meeting Feb, 19, 2010. Currently Limiting Pbar Intensity due to Losses in Squeeze. Requesting lower pbars due to losses

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Tevatron issues and operations

Tevatron Issues and Operations

All Experimenter Meeting

Dean Still

Monday, February 22, 2010


Collider ii integrated luminosity
Collider II Integrated Luminosity

Courtesy: RunCo Team

0900 meeting Feb, 19, 2010

Tevatron Issues and Operations


Currently limiting pbar intensity due to losses in squeeze
Currently Limiting Pbar Intensity due to Losses in Squeeze

Requesting lower pbars due to losses

In Squeeze and Collisions

Tevatron Issues and Operations


Problems
Problems

  • Losses at LMB1SD (~29rads/sec – quench ~50rads/sec) remain high during squeeze LBSEQ 7-14.

  • Pbar vertical emittance blow up at and pbar beam loss at end of squeeze LBSEQ 21-25.

  • Pbar vertical emittance blow up at and pbar beam loss at Initiate Collisions.

Tevatron Issues and Operations

4


Current problems
Current Problems

April 6955

7611

7612-14

Changes to

End of squeeze

7615

Pbars falling out

Pbar vert emittance growth

Tevatron Issues and Operations


Losses at b0 lmb1sd in squeeze
Losses at B0 (LMB1SD) in squeeze

Quench

Stores last April

Current stores

Tevatron Issues and Operations


Losses at c0 lmc4sm in squeeze
Losses at C0 (LMC4SM) in squeeze

Current stores

Stores last April

Quench

Tevatron Issues and Operations


Pbar losses at d0 lmc492 in squeeze
Pbar Losses at D0 (LMC492) in squeeze

Stores last April

Current stores

Quench

Tevatron Issues and Operations


Compare pbar beam loss in the squeeze
Compare Pbar beam loss in the Squeeze

Last April

current

Tevatron Issues and Operations


Compare proton beam loss in the squeeze
Compare Proton beam loss in the Squeeze

Last April

current

Tevatron Issues and Operations


Studies work completed

Separator scans MOS store 7606- D0 lum increased ~2% and CDF/D0 ratio went from ~5% to 3%

Lowered Pbar tunes at lbseq 25 (due to Scalloping)

Evened out S7 table at lbseq 21-24.

B0 VANG bumps lbseq[2-24] to explore B0 pipe aperture.

Studies/Work Completed

Tevatron Issues and Operations

11


Test of air flow from d0 hall to tunnel and possible lowbeta quad roll
Test of air flow from D0 hall to tunnel and possible Lowbeta Quad roll

Turned on fan

in tunnel.

D0 IP pos moved

By ~ 100 um.

Orbit stabilization

Changed HC49 by ~ 2amps

Possible for orbit errors

Store to store

D0 X IP Pos

HC49

Tevatron Issues and Operations


Separator scan cdf d0 lum ratio
Separator Scan CDF/D0 Lum ratio Quad roll

CDF/D0 Lum ratio

  • Separator scans MOS store 7606

  • D0 lum increased ~2%

  • CDF/D0 ratio went from ~5% to 3% difference.

CDF Lum

Sept 2009

Tevatron Issues and Operations


Summary
Summary Quad roll

  • Tevatron has requested lower pbar intensities ~ 400E10 to shoot from based on losses around B0 during the early squeeze.

  • Tevatron currently has pbar vertical emittance growth at the end of the low beta squeeze and initiate collisions which is effecting initial luminosity.

Tevatron Issues and Operations


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