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

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[[FCAL Beamtest Setup Pictures]]
 
[[FCAL Beamtest Setup Pictures]]
 
[[File:Detector.jpg|300px|thumb|left|Outside view of detector housing 25 modules.]]
 
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[[http://www.flickr.com/photos/63927802@N02/sets/72157627993117345/ Matt's Flikr page]]
 
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Revision as of 19:20, 15 November 2011

2011 Hall B FCAL Beam Test

Test out 25 FCAL modules using Hall B electron beam.

  • HBList Hall D Beam Test of Forward Calorimeter
  • HDFCALEST electronic log book (from on-site)
  • HDFCALTEST electronic log book (from off-site)

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 - 11/08/2011 (Tue)~

Setup

Pictures of setup to hold detector and trigger scintillators. Built by John Frye and the machine shop at IU, and shown here:

FCAL Beamtest Setup Pictures

Outside view of detector housing 25 modules.

[Matt's Flikr page]

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).
  • All thresholds on discriminators have been adjusted to 50 mV.
  • List of electronics are shown here:

List of FCAL Beamtest Electronics

Geometry

The geometry for the Hall B tagger and our detector setup is shown in

FCAL Beamtest Geometry

Hall B Geometry


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.


Modules

Each of the PMT/base combinations for the

  • 25 detector modules
  • 10 trigger scintillator modules
  • There are 3 remote trigger paddles, all with different dimensions.
    • Thick - 1.760" * 0.98"
    • "Medium" - 0.880" * 0.109"
    • "Thin" - ???" * ???"

have been tested in tandem for gain adjustments. The position, base ID, PMT ID, and cable number are listed here:

List of FCAL Beamtest Component IDs

Gain Adjustments

Gains for each PMT/base combination have been tested. We placed two trigger paddles on top of each other, and varied the HV on the one we are testing, while keeping the other held at 1700 V. The coincidence rates for cosmic rays were taken, and plotted against HV. The figures are here:Gain Adjustments, with a table of HV values.

Gains for ID:0x72360e


Links

Personnel Available for Datataking

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

Operating Safety Procedure

OSP can be found at PHY-11-040-0SP

Links to EHS&Q manual: