Difference between revisions of "2011 Hall B FCAL Beam Test"

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(Electronics)
(Electronics)
Line 52: Line 52:
 
*** the 3-way OR signal of the vertical bars
 
*** the 3-way OR signal of the vertical bars
 
*** the 4-way OR signal of the VETO counters should be put in VETO
 
*** the 4-way OR signal of the VETO counters should be put in VETO
 +
Pins should be set to OFF for channels "C" and "D", and the coincidence level should be set at "1".
 
** LeCroy 825E Risetime-Compensated Discriminator (I) - discriminator for 3 horizontal trigger signals
 
** LeCroy 825E Risetime-Compensated Discriminator (I) - discriminator for 3 horizontal trigger signals
 
** LeCroy 825E Risetime-Compensated Discriminator (II) - discriminator for 3 vertical trigger signals
 
** LeCroy 825E Risetime-Compensated Discriminator (II) - discriminator for 3 vertical trigger signals

Revision as of 21:42, 19 October 2011

2011 Hall B FCAL Beam Test

Schedule

Beam

  • 2011/11/19 (Sat) beam start
    • 11/19/2011 (Sat) 11/20/2011 (Sun) COMMISSIONING
    • 11/21/2011 (Mon) 12/04/2011 (Sun) 4446 4 Lin 14
    • 12/05/2011 (Mon) 12/18/2011 (Sun) 4446 4 Lin 14
    • 12/19/2011 (Mon) 12/21/2011 (Wed) 4446 4 Lin 3
  • 12/22/2011 (Thu) 01/03/2012 (Tue) WINTER DOWN
    • 01/04/2012 (Wed) 01/13/2012 (Fri) 2528 3 Cir 10 special Hall A Ee
    • 01/14/2012 (Sat) 01/24/2012 (Tue) 2254 2 Cir 11
    • 01/25/2012 (Wed) 01/26/2012 (Thu) 4446 4 Lin 2 special Hall A
    • 01/27/2012 (Fri) 02/10/2012 (Fri) 2254 2 Cir 15
    • 02/11/2012 (Sat) 02/24/2012 (Fri) 5542 5 Lin 14
    • 02/25/2012 (Sat) 03/09/2012 (Fri) 5542 5 Lin 14
    • 03/10/2012 (Sat) 03/23/2012 (Fri) 5542 5 Lin 14
    • 03/24/2012 (Sat) 04/06/2012 (Fri) 5542 5 Lin 14
    • 04/07/2012 (Sat) 04/14/2012 (Sat) 4446 4 Lin 8
    • 04/15/2012 (Sun) 04/16/2012 (Mon) EXCHANGE TARGET, NO BEAM
    • 04/17/2012 (Tue) 04/18/2012 (Wed) 4446 4 Lin 2
    • 04/19/2012 (Thu) 04/20/2012 (Fri) 4446 4 Lin 2
    • 04/21/2012 (Sat) 04/22/2012 (Sun) 4446 4 Lin 2
    • 04/23/2012 (Mon) 04/24/2012 (Tue) 5542 5 Lin 2
    • 04/25/2012 (Wed) 04/26/2012 (Thu) 5542 5 Lin 2
    • 04/27/2012 (Fri) 04/28/2012 (Sat) 5542 5 Lin 2
    • 04/29/2012 (Sun) 04/30/2012 (Mon) 5542 5 Lin 2
    • 05/01/2012 (Tue) 05/04/2012 (Fri) 2254 2 Cir 4
    • 05/05/2012 (Sat) 05/09/2012 (Wed) INSTALL RASTER, SET BEAMLINE, NO BEAM
    • 05/10/2012 (Thu) 05/17/2012 (Thu) 2254 2 Lin 8 e+ HD performance tests
  • 05/17/2012 (Thu) Start of 12 GEV SHUTDOWN

Construction

  • Target date to finish construction - 11/02/2011 (Wed)
  • Drive from IU to JLab for installation - 11/03/2011 (Thur)~

Electronics

  • Have put together NIM modules at IU, no need to borrow any NIM modules
  • Have tested inputs/outputs, all units working
  • Output widths of all NIM modules with adjustable widths set to 50 ns. As long as the rate of electrons coming in is less than 20 MHz,

we should be fine (the total rate on the CLAS tagger should be on this order).

Pins should be set to OFF for channels "C" and "D", and the coincidence level should be set at "1".

    • LeCroy 825E Risetime-Compensated Discriminator (I) - discriminator for 3 horizontal trigger signals
    • LeCroy 825E Risetime-Compensated Discriminator (II) - discriminator for 3 vertical trigger signals
    • LeCroy 621L Quad Discriminator - discriminator for 4 outside VETO counters
    • ** LeCroy 429A Logic Fan-In/Out (II) - Use top channel for OR of 4 VETO counter signals. This will then go into the VETO signal in the LeCroy 365AL Dual 4-Fold Logic. The middle and bottom channels should be used as the 3-way OR of the horizontal and vertical trigger signals, respectively. The front panel switch should be set to "4x4" so that the 3 channels are all independent of each other.

Beam Rates

Rates measured on floor with scintillators
Rates measured on floor with scintillating fibres


  • The difference between the two figures seems to stem from the scintillating fibres having

directional dependence on the incoming electrons. Without any veto on the incoming electron direction, it seems we will be saturated with scattered electrons.

  • Also note that these measurements were done near the end of the beam, where there is

lots of scattering as the main beam exits the vacuum.

Links

Personnel Available for Datataking

  • IU
    • Kei Moriya (time centered around November 7th not available due to birth of child)
  • Regina