DPG 2018 V. Patel Overview Beam test results for the new DIRICH Setup for COSY beam readout chain for MAPMTs and MCPs test Test results Vivek Patel University of Wuppertal Deutsche Physikalische Gesellschaft (DPG), February 2018 Slide: 1
HADES-RICH upgrade Exploded sketch of upgraded HADES-RICH DPG 2018 V. Patel Overview Setup for COSY beam test Test results Slide: 2
Readout Electronics for RICH MAPMTs DPG 2018 Readout electronics for 3 x 2 MAPMT modules V. Patel Overview Setup for COSY beam test Test results Slide: 3
Setup for COSY RICH testbox DPG 2018 V. Patel Overview Cherenkov prototype detector Setup for COSY beam for COSY beam test in Nov test 2017 Test results Two fully equipped 3x2 module, 12 MAPMTs, glass/ quartz radiator. 6 of which were coated with wavelength shifting coating for testing UV efficiency. Slide: 4
Test Parameters and Initial results DPG 2018 V. Patel There were many parameters tested during this beam test. Overview Main motive was to check the DiRICH concept in real Setup for COSY beam beam conditions. test In particular hit multiplicity. Test results Noise behaviour in MAPMT and readout electronics. Ring sharpness. Single photon detection efficiency. Expected time precision from electronics. (HK21.4 - Time resolution of the DiRICH MAPMT readout with and without WLS coverage by Adrian Amatus Weber) To check the gain in photons due to wavelength shifting coating on MAPMTs. Slide: 5
Hit Multiplicity DPG 2018 AllTDCs HitDist2d AllTDCs_HitDist2d AllTDCs_HitDist2d V. Patel 2200 30 2000 1800 Overview 25 1600 1400 Setup for 1200 20 COSY beam 1000 test 800 15 600 Test results 400 10 200 0 5 10 15 20 25 30 Xpos(Pixel) 1800 1600 1400 Mean Mean 13.02 13.02 1200 1000 Std Dev 6.129 Std Dev 6.129 800 600 400 200 0 0 10 20 30 40 50 60 70 80 90 detected hits/trigger Slide: 6
Hit Multiplicity DPG 2018 Multiplicity as a function of threshold voltage Number of photons V. Patel 14 Overview Setup for 12 -1100 V COSY beam test 10 Test results -1000 V 8 -900 V 6 4 2 0 100 200 300 400 500 Threshold in mV Simulation : Expect 16 photons with measured quantum efficiency and 100% collection efficiency. Slide: 7
Hit Multiplicity DPG 2018 V. Patel Hit Multiplicity for different combinations of WLS coating Overview Number of Photons Setup for 18 COSY beam test 16 WLS on all the PMTS Test results 14 WLS on half of the PMTS 12 WLS on none of the PMTS 10 8 50 100 150 200 250 Threshold in mV Slide: 8
Hit Multiplicity DPG 2018 Hit Multiplicity ratios for different combinations of WLS V. Patel coating Overview Ratio normalized to No WLS Setup for 1.25 COSY beam test Ratio of WLS on ALL pmts & WLS on NO pmt Test results 1.2 Ratio of WLS on HALF pmts & WLS on NO PMT Ratio of WLS on ALL pmts & WLS on HALF PMTs 1.15 Ratio normalization to WLS on NO pmt 1.1 1.05 1 50 100 150 200 250 Threshold in mV Slide: 9
Summary DPG 2018 V. Patel Overview Beam test at COSY was successful. Setup for COSY beam Initial results shows that concept of DiRICH will work. test WLS coating increases the Multiplicity ∽ 23% Test results Plan is to equip inner part of HADES-RICH with WLS coated MAPMTs. Upgraded HADES-RICH will see its first beam in last quater of 2018 at SIS 18, GSI. Mass production of DiRICH has already began. It is expected that the delivery will start in March-April 2018. Slide: 10
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