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HV upgrade - status

HV upgrade - status. Crates R-1 and R-2 installed in the pit (20 distributors) Connection established, demo monitor program works Amplitude spectra identical with CAEN and BG HV distributors! Crate R-3 with 10 distributors already in CERN, wait to be installed. HV upgrade - overview.

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HV upgrade - status

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  1. HV upgrade - status • Crates R-1 and R-2 installed in the pit (20 distributors) • Connection established, demo monitor program works • Amplitude spectra identical with CAEN and BG HV distributors! • Crate R-3 with 10 distributors already in CERN, wait to be installed

  2. HV upgrade - overview • Everything's goes fine • To finish upgrade needs 7-8 working days • Foreseen for summer this year (4.8 - 12.8) • Hardware commission: mid of August • Integration to DCS – autumn this year

  3. Pixels repair - Currently, 98 pixels on ToF-L don't work, and 24 on ToF-R (our analysis, based on ToF online monitoring program) • We found some spare PMTs with scintilators 6 cm – 1 pcs (needed ~30) 7 cm – 17 pcs (needed ~30) 8 cm – 25 pcs (needed ~30) -------------- 43 pcs (needed ~90) • Condition unknown, hope they are OK • Replacement scheduled for mid August

  4. PMTs • FEU-87 doesn’t produce any more, no spare • Hamamatsu R3478 founded as spare parts from Buda wall - 20-30 pieces • A lot more in Buda wall, optically connected with grease, can be dismounted • Smaller than FEU, mechanically can beadapted to fit in existingcassette

  5. R3478 - Characteristic • Wavelength (Peak): 420nm • Dynode Stages: 8(FEU-87 11!) • Anode to Cathode Supply Voltage: 1700V • Max Anode to Cathode Voltage: 1800V • Gain Typ.: 1.7 x 106 • Rise Time Typ.: 1.3 ns • Timing performance seems OK, but amplitude? • Need to be justify, gain doesn’t seems OK!

  6. Conclusion • Hamamatsu PMT has to be tested with our scintillators • According to characteristics, doesn’t look promising (gain) • We need output of order of volts! • I this PMT perform well, then we can think to produce replacement for bad pixels in ToF

  7. ToF-LR Software • MihailoSavic left Shine • Claim that he finished all jobs taken in the past • Obviously, this is not true! • We have to identify which jobs are not finished (Andras) • Then we have to see which can be done by Belgrade! • As always, man power is critical!

  8. Thank you!

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