Archived Messages for CLAS_PHOTON_1997@cebaf.gov: Tagger Timing Studies (electon beam setup)

Tagger Timing Studies (electon beam setup)

Elton Smith (elton@CEBAF.GOV)
Mon, 23 Jun 1997 17:38:05 -0400

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Here are some thoughts on the plan for taking data with the tagger during the last shift
of "electron beam" commissioning. Here is a proposed plan discussed by Elton Smith, Luc
Murphy, Dave Doughty and Steve Barrow:

General Setup:

Tagger Magnet ON (Current setting for 4 GeV = ...)
Radiator IN (10**-6)
Target IN (Saclay H target)
Readout: TOF and Tagger crates required. (Note: Including ADCs with beamline devices).
Readout: Other CLAS systems desirable.

0. Tune photon beam with 4 GeV electrons.

1. Look at the four E-counter pmt signals (available in counting house) and do gain
matching "by eye" on the scope.
Vary HV to understand voltage dependence of signal.
Question: Can we bring up a T-counter signal with corresponding E counter to check E-T timing?

2. Check Timing in the data.

Setup Trigger using Steve's configuration file (before PRESTART)

A) Trigger (Trigger Supervisor Input=1) : Level 1 (File = MinDEDX_TOF_ECALlow_Sect123456.trg)

B) Trigger (Trigger Supervisor Input=1) : Tagger (asynch input)
* Level 1 (Trigger file = MinDEDX_TOF_ECALlow_Asynch_Sect123456.trg)

C) Trigger (Trigger Supervisor Input=8, Low intensity, Prescale factor as required) :
Tagger only

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