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E.C. Aschenauer RSC - Meeting 2012/03/232  Known complications:  100 GeV: o noise due to pickup especially at injection less significant at flat top.

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Presentation on theme: "E.C. Aschenauer RSC - Meeting 2012/03/232  Known complications:  100 GeV: o noise due to pickup especially at injection less significant at flat top."— Presentation transcript:

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2 E.C. Aschenauer RSC - Meeting 2012/03/232

3  Known complications:  100 GeV: o noise due to pickup especially at injection less significant at flat top method to correct for it was developed by Dima and Bill and implemented shown data have this correction included noise was correlated to stochastic cooling sitting before / after the polarimeters o B2D is an experimental polarimeter  new detector types  255 GeV o noise is gone  most likely due to grounding improvements and removing of antennas at the polarimeters and the stochastic cooling o polarimeters not yet normalized to jet, need 10 long fills at least normalization is polarimeter dependent ratios like Y1D to Y2U need not to be 1 at the moment E.C. Aschenauer RSC - Meeting 2012/03/233

4 polarisation at injection Blue and Yellow Caveat: pC numbers not normalized to jet E.C. Aschenauer RSC - Meeting 2012/03/234 injections for 100 GeV injections for 255 GeV

5 E.C. Aschenauer RSC - Meeting 2012/03/235 polarisation at flat top Blue and Yellow H-Jet  longitudinal H-Jet Run-11

6 E.C. Aschenauer RSC - Meeting 2012/03/236 0.9%±0.11/hour 0.62%±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 not do the trick

7 E.C. Aschenauer RSC - Meeting 2012/03/237 1.288%±0.18/hour 0.71%±0.28/hour H-Jet: Fills: 16570-16592 trans + longitudinal H-Jet: Fills: 16586-16592 longitudinal

8 E.C. Aschenauer RSC - Meeting 2012/03/238 1.4%±0.21/hour 0.10%±0.23/hour Polarisation lifetime in yellow very similar to longitudinal 255 GeV fills

9 ~L store avg Goal E.C. Aschenauer RSC - Meeting 2012/03/239

10 transverse longitudinal longitudinal E.C. Aschenauer RSC - Meeting 2012/03/2310

11 E.C. Aschenauer RSC - Meeting 2012/03/2311 Shown are the polarisation measurements before and after the rotator ramp at 255 GeV Blue Beam Yellow Beam

12 E.C. Aschenauer RSC - Meeting 2012/03/2312 24 GeV 100 GeV 255 GeV

13  Can we recover the loss of polarisation at injection  Do we understand the difference in flat top polarisation for the transverse vs. the longitudinal stores at 255 GeV  could this point to an intensity dependence  is the ramp procedure for a transverse and longitudinal store the same?  would a transverse fill help to understand this difference ?  Could we do something about the loss in polarisation in yellow ~5% during the rotator ramp  There was some time ago talk about an energy scan could this help the polarisation at flat top  Do we understand why the transverse spin component changes without changes in the rotator setting E.C. Aschenauer RSC - Meeting 2012/03/2313

14 E.C. Aschenauer RSC - Meeting 2012/03/2314 polarisation at injection Blue and Yellow Caveat: only first round of cleaning up noise in polarimeters was done pC numbers not normalized to jet

15 polarisation at flat top Blue and Yellow H-JET E.C. Aschenauer RSC - Meeting 2012/03/2315

16 E.C. Aschenauer RSC - Meeting 2012/03/2316 0.47%±0.040/hour 0.97%±0.047/hour

17 E.C. Aschenauer RSC - Meeting 2012/03/2317 0.46%±0.11/hour 0.80%±0.11/hour H-Jet Fills: 16386-16439

18 E.C. Aschenauer RSC - Meeting 2012/03/2318 0.90%±0.095/hour 0.42%±0.08/hour

19 E.C. Aschenauer RSC - Meeting 2012/03/2319 1.85%±0.13/hour 0.41%±0.07/hour

20 E.C. Aschenauer RSC - Meeting 2012/03/2320 1.77%±0.17/hour 0.18%±0.118/hour H-Jet Fills: 16502-16511

21 E.C. Aschenauer RSC - Meeting 2012/03/2321 0.76%±0.08/hour 0.35%±0.11/hour

22  100 GeV:  main loss in polarisation through decay in fill  polarisation decay varies from week to week for the two beams  jet and pC polarimeters consistent observing the same trends  could this nice data set be used to correlate it to machine parameters  improve polarisation at 255 GeV  255 GeV:  the polarisation loss is through ramp to full energy, through rotator ramp and polarisation lifetime  jet and pC polarimeters consistent observing the same trends  current flat store polarisation consistent with 2011 average  polarisation decay in fill “comparable” to 2011  Is there any possibility to go back to the polarisation at 255 GeV transverse fills E.C. Aschenauer RSC - Meeting 2012/03/2322

23 E.C. Aschenauer 23 Fills16453-16461before split tunes 1.08%±0.1 1.4%±0.21

24 E.C. Aschenauer 24 Split Tune Fills 16462-16465 0.83%±0.15 2.16%±0.2

25 E.C. Aschenauer 25 Fills16468-16478after split tunes 0.23%±0.11 1.85%±0.19

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