Minutes-4-14-2008

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Joint FDC/CDC Meeting

Date: April 14, 2008

Participants: Daniel, Simon, Fernando, Jim, Mark. David, Curtis, Yves

Next Meeting: April 28, 2008 @ 1:30 p.m.

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ASIC Studies

- We reviewed the test plan document that Fernando prepared for the
  FDC and CDC ASIC characterization studies.  This is included below
  in its entirety.

  Purpose: Develop tests for the CDC and FDC prototype wire chambers with 
  the new ASIC preamp hardware to verify the operating characteristics of 
  the system. This information will be provided to Mitch Newcomer and his 
  group for design optimization of the GAS-2 ASIC.

  CDC:
  1. Test Setup - Describe required hardware and disposition.
  2. Chamber gain plot & HV plateau with the anticipated gas mixtures - 
     Describe procedure.
  3. Operating HV
  4. Source - Fe55, cosmics, etc.
  5. Dynamic Range - Observed and estimations.
  6. Amplitude Distributions - May need to disable shaping on shaper board 
     and provide estimations for actual operating conditions.
  7. Collection or gallery of pulses - scope pictures and data. Data may 
     be available from the scope (as input to Excel) or from fADCs. Describe.
  8. Noise - Need to know or estimate detector and readout capacitance. 
     May add additional capacitance at preamp input to simulate final 
     detector configuration.
  9. Schedules

  FDC:
  1. Test Setup - Describe required hardware and disposition.
  2. Chamber gain plot & HV plateau with the anticipated gas mixtures - 
     Describe procedure.
  3. Operating HV
  4. Source - Fe55, cosmics, etc.
  5. Dynamic Range - Observed and estimations.
  6. Amplitude Distributions - May need to disable shaping on shaper board 
     and provide estimations for actual operating conditions.
  7. Collection or gallery of pulses - scope pictures and data. Data may 
     be available from the scope (as input to Excel) or from fADCs. Describe.
  8. Noise - Need to know or estimate detector and readout capacitance. 
     May add additional capacitance at preamp input to simulate final 
     detector configuration.
  9. Schedules

  From the results of these tests, we should be able to specify what 
  gains and shaping constants are required or acceptable for operation of 
  the CDC, the FDC anodes and the FDC cathodes. Please note that not all 
  parameters may be available to fully exercise the dynamic range that 
  will be encountered in the experiment. Therefore,  estimates from 
  simulations or calculations will be necessary.

- A setup for measuring the gas gain was prepared by DSC and is desribed in CLAS-Note 96-022.

Minutes prepared by Daniel. Send any comments or corrections along.