A SUMMARY ON POLARISATION IN RUN-12FOR 255 GEV

E.C. ASCHENAUERPRESENTING THE WORK DONE BY ALAN,

ANDERS, BILL AND DIMA

2012/04/03 2

255 GEV RESULTS

polarisation at injectionBlue and Yellow

Caveat:Online pC numbers not normalized to jet

E.C. Aschenauer

injections for 255 GeV

Flat top for 255 GeV

2012/04/03 3

255 GEV RESULTS

E.C. Aschenauer

polarisation at flat topBlue and Yellow

H-Jet

longitudinal

Blue-1

Yellow-1

2012/04/03 4

NORMALIZATION TO H-JET

E.C. Aschenauer

Blue-1: already in good agreement with jet

Blue-2: experimental polarimeter need a to normalize by 1.2

2012/04/03 5

NORMALIZATION TO H-JET

E.C. Aschenauer

Yellow-2: already in good agreement with jet

Yellow-1: need a to normalize by 1.07

2012/04/03 6

255 GEV RESULTS TRANSVERSE FILLS

E.C. Aschenauer

1.4%±0.21/hour0.10%±0.23/hour Polarisation lifetime inyellow very similar to longitudinal 255 GeV fills

2012/04/03 7

255 GEV RESULTS

E.C. Aschenauer

1.288%±0.18/hour0.71%±0.28/hour

H-Jet:Fills: 16586-16592longitudinal

2012/04/03 8

255 GEV RESULTS

E.C. Aschenauer

0.9%±0.11/hour0.62%±0.13/hour

Run-110.39%±0.07/hour

Run-110.78%±0.07/hour

Polarisation lifetime very similar run-11 and run-12 so 255 GeV did notdo the trick

2012/04/03 9

255 GEV RESULTS

E.C. Aschenauer

0.8%±0.096/hour1.2%±0.16/hour

Polarisation Lifetime for lowEmittance fills

2012/04/03 10

255 GEV RESULTS

E.C. Aschenauer

0.39%±0.10/hour0.75%±0.13/hour

Polarisation Lifetime sincelast week

Jet same fill range

2012/04/03 11

POLARISATION LOSS THROUGH ROTATOR RAMP

E.C. Aschenauer

Shown are the polarisationmeasurements before and after the rotator ramp at 255 GeV

Blue Beam

Yellow Beam

2012/04/03 12

RADIAL SPIN ANGLE MEASURED BY PC

E.C. Aschenauer

24 GeV

100 GeV

255 GeV

2012/04/03 13

BIG PROBLEM

Basically no targets left in blue and yellow If you want these info as presented we need to install

new targets in both beams Impact on APEX program

E.C. Aschenauer