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Requirements to RICH FEE. Serguei Sadovsky IHEP, Protvino CBM meeting GSI, 10 March 2005. Parameters of the PMT FEU-Hive. External PMT diameter is 6 mm Photo-cathode diameter is 5 mm Photo-detector element diameter 7 mm PMT length is 60-70 mm Photo-cathode: K 2 CsSb

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Requirements to RICH FEE

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Requirements to RICH FEE

Serguei Sadovsky

IHEP, Protvino

CBM meeting

GSI, 10 March 2005


Parameters of the PMT FEU-Hive

  • External PMT diameter is 6 mm

  • Photo-cathode diameter is 5 mm

  • Photo-detector element diameter 7 mm

  • PMT length is 60-70 mm

  • Photo-cathode: K2CsSb

  • Quantum efficiency at 410 nm is 25%

  • Effective number of dynodes is 12

  • Nominal HV is less than 2 kV

  • Amplification is 106

  • Dynamical charge range is 0.25-2.5 pC

  • Noise current is 3000 e/sec

  • Capacitance is 15 pF

  • Power dissipations is 40 mW


Inputs for RICH Front End Electronics

on the base of the PMT FEU-Hive:

  • Negative polarity of the output signals

  • Total charge in a pulse – from 0.25 to 25 pC

  • Noise -- 3000 e/sec

  • Pulse lenght -- several ns

  • Output capasitance -- 15 pF

  • ADC bit number -- 8-9 bits

  • Channel density -- 2.5 channels /cm2

  • Total number of channels – 100000- 200000


HV regulation

  • Classical scheme of the HV regulation with ballast resistor and PMT dividing sercuit

  • The ballast resistor has 6 bit regulation in the region 1.6-2 kV, i.e. with 6V step

  • Avaliable space, we have only 0.4 cm2/channel, due to this we have, probably, no possibility for the HV regulation


Summary

  • Nominal HV for the PMT is 2 kV

  • No HV regulation, but pre-selection of the PMTs with different gains

  • Power consumption 40 mW/PMT due to HV divider

  • 8-9 bit ADC

  • The width of the PMT signal is several ns

  • Shaper time depends on requirements to the time resolution, it should be at least 3 time samples for any PMT pulse, thus τ~ 3/Fclock

  • The main problem is the electronics density, i.e.

    0.4 cm2/channel


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