Test Beam studies of COMPASS ECAL 0 module prototype with MAPD readout ECAL 0 Team, JINR, DUBNA A. Olchevski, JINR (Dubna)
Possible view of ECAL 0: sizes: ~ 360 x 360 cm 2 with central hole ~ 120 x 120 cm 2 length: ~ 25 -30 cm modules: 800 with size 12 x 12 cm 2 (“shashlyk”) MAPDs: ~9300 (Multipixel Avalanche Photo. Diode) for inner part: 16 MAPDs per module for outer part: 9 MAPDs per module A. Olchevski, JINR (Dubna)
MAPD Stucture ZECOTEK: MAPD-3 A 15 000/mm 2 MAPD-3 B 40 000/mm 2 A. Olchevski, JINR (Dubna)
Characterics of MAPD A. Olchevski, JINR (Dubna)
Characterics of MAPD • • • high number of pixels ~135 000 ( 3 x 3 mm 2 ) work at low bias voltage (<70 V), PDE ~12 %( 520 nm) (Photon Detection Efficiency) Gain ~3 x 104 Temperature dependences ~ 3% insensitive to magnetic fields up to 15 T, compact, rugged and show no aging* tolerate accidental illumination radiation hardness (>1012 p/cm 2 ) * Capacitance ~ 300 p. F Problems: recovery time , temperature dependence gain vs voltage Gain and PDE * under study A. Olchevski, JINR (Dubna)
BEAM test at PS (T 9) 3 type modules: - sampling 4 mm. Sc/4 mm Pb, 96 x 96 mm 2 , 36 fibers, 6 ch-s (~10 -11 % sampling) - sampling 4 mm. Sc/2 mm Pb, 12. 12 x 12. 12 cm 2 , 64 fibers(32 loops), 1 tower , 4 bandles , Db = 6 mm - sampling 4 mm. Sc/2 mm Pb, 4. 04 x 4. 04 cm 2 , 144 fibers(72 loops), 9 tower, Db = 6 mm (~7%) Goals of the measurements - Resolution vs energy - Compare results with MAPD and PM - Number of photoelectrons - Temperature stabilization - Calibration by LED (monitored by pin diode) - Optimization of module structure A. Olchevski, JINR (Dubna)
Light guide - cone D 1 / D 2= 6/4. 4 KPM=0. 54 KAmpd/PM=0. 6 A. Olchevski, JINR (Dubna)
Setup at Beam test at. T 9 A. Olchevski, JINR (Dubna)
Read Out FEE – fast preamplifier, G=14 Trigger – COMPASS( Munich, Protvino) DAQ – VME CAEN V 792 AC Charge ADC 32 Ch ( SADC Option) Temperature stabilization - Peltier cooler with fan (working point 15 o +-0. 2 o)* Calibration – Led, controlled by Pin Diode *The method of gain stabilization by using feedback with HV is possible, but noise increase with T (2 times/ 9 degree) A. Olchevski, JINR (Dubna)
Response 1 tower modules at 4 Ge. V 1 ch= 5. 24 Phe 1 ch=2. 00 Phe A. Olchevski, JINR (Dubna)
Stability A. Olchevski, JINR (Dubna)
Response vs Beam Intensity A. Olchevski, JINR (Dubna)
Response & resolution vs Beam Energy Response & resolution of PM Response & resolution of AMPD Threshold estimation of AMPD 3σped =30 ch-> 60 phe -> ~75 Me. V A. Olchevski, JINR (Dubna)
Response & resolution vs Beam Energy A. Olchevski, JINR (Dubna)
A. Olchevski, JINR (Dubna)
Plans - Long term stability - Temperature stabilization for the 9 tower module - Test with COMPASS DAQ& SADC - Tests in muon beam during the COMPASS GPD run to work in real background condition - Tests in 2009 with High Energy Beam H 2. Uniformity - Continue collaboration with Zecotek firm ( increase the gain, size, PDE and decrease recovery time) A. Olchevski, JINR (Dubna)
Acknowledgements Appreciate very much important opportunity of T 9 facility. Thanks to Lau Gatignon for very good beam quality & support. We gratefully acknowledge the support of the Protvino and Munich groups for presented equipment and readout electronics. We also thank G. Mallot and A. Magnon for help and support. Special thanks are due to V. Anosov and V. Pessaro for technical assistance. A. Olchevski, JINR (Dubna)
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