Baudrand SylvestrePhysics Research Commitee1 Status of the Longitudinal and Transverse Polarimeters Working polarimeters HERA polarization status 2005.

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Presentation transcript:

Baudrand SylvestrePhysics Research Commitee1 Status of the Longitudinal and Transverse Polarimeters Working polarimeters HERA polarization status 2005 Efficiency of the polarimeters TPOL & LPOL Cavity LPOL Energy spectrum with locked or unlocked cavity Bremsstralung spectra Present Status New calorimeter

Baudrand SylvestrePhysics Research Commitee2 WORKING POLARIMETERS

Baudrand SylvestrePhysics Research Commitee3 Polarization Delivered in 2005 Polarisation is rather low (less than 30%) compared to the previous year. Polarization do not show a clear tendency. Polarization level is not enough for experiments. For ex. HERMES predictions are based on 50%. Experiments wait that the Polarization level increase Helicity change

Baudrand SylvestrePhysics Research Commitee4 Efficiency of the Polarimeters TPOL ~94% LPOL ~91% Both ~98.25% LPOL: Machine studies (begin of 2005) + Time for syst. studies and Cavity studies TPOL: TPOL vacuum window + Hardware electronics.

Baudrand SylvestrePhysics Research Commitee5 LPOL & TPOL

Baudrand SylvestrePhysics Research Commitee6LPOL Good agrement TPOL-LPOL even at online level 2% errors between CR and SW. Detailed systematic studies are planned to decrease this number. Data from 1st Jan to 20th May show a clear agreement at online level (no LPOL data quality corrections) CR=Crystal calo. SW= Sandwich calo.

Baudrand SylvestrePhysics Research Commitee7TPOL Detailed syst. Studies shows beam spot to Polarization correlations. Monte Carlo simulation confirmed the observation. Focus correction now applied online to data: There were some changes in 2005 in hardware: Stepping motor controler changed. Si detector damaged 2 month ago- Debugging in progress. Function generator for depol. Current TPOL syst. 3.5% Applied on line

Baudrand SylvestrePhysics Research Commitee8 NEW CAVITY LPOL

Baudrand SylvestrePhysics Research Commitee9 The new Cavity LPOL is recording Comptons event now Histograms show a clear signal of compton photons above the Bremsstrahlung spectrum. Estimation gives a rate of 0.1 photons per bunch crossing Energy spectrum with locked or unlocked cavity 10/03/05

Baudrand SylvestrePhysics Research Commitee10 Bremsstrahlung Spectra Synchrotron radiation shift has been reduced by putting a one X0 tungsten plate in front of the calo Problems with electronics readout induced a « shoulder », now removed Brems Spectra is now understood I bunch =83,7  A PM Voltage: 850V I bunch =170  A « shoulder »

Baudrand SylvestrePhysics Research Commitee11 Present status Locking STABLE under any accelerator conditions. Locking STABLE / switch laser pol. DAQ problems, under study Polarisation estimation almost there. Cavity LPOL is on the way to deliver polarisation 06/05/05 BREMS COMPTONS

Baudrand SylvestrePhysics Research Commitee12 New Calorimeter Neither of the 2 LPOL calo are suitable for cavity operations. Tungsten- Quartz fiber sampling calorimeter. Signal produced from Č radiation in the quartz fiber. 50 layers of tungsten plate interleaved with layers of quartz fiber

Baudrand SylvestrePhysics Research Commitee13 New Calorimeter Will be finished by end of June, take into operation as soon as possible Design and complete simulation of Č light done Energy resolution within the requirements To do: Cut the fibers & bundle them.

Baudrand SylvestrePhysics Research Commitee14Conclusions Working polarimeters: In 2005 Efficiency for the LPOL is ~ 91% and TPOL ~ 94%, combined 98.3% TPOL & LPOL: Polarimeters in agreement within systematics Cavity LPOL: Procedure for Laser/e-beam interaction now established Brems. spectrum is understood. DAQ problems are under studies. New calorimeter will be built by the end of June and put in operation immediately after.