Minutes of the 4/17/09 TOF/SC meeting

["Mark M. Ito" <marki@jlab.org>]

Find them at http://tinyurl.com/ckl97u and attached.

Time-of-Flight/Start-Counter Meeting, April 17, 2009

Minutes

   FIU: Seema
   FSU: Paul, Sasha O.
   JLab: Beni,Mark I., Elton, Simon, Eugene, Chuck, Tim, Sascha S.

Time-of-Flight Status

   Paul and Sasha O. presented photos and plots from work with their first
   prototype. There were photos of the test light guides, the test module
   and the testing box. Sasha showed some initial data from cosmic ray
   runs with the moudule. See [16]their wiki page for details.

Start Counter Status

   Seema reported on current plans. The plan for this summer is to build a
   prototype. 2, 3, and 5 mm scintillator has been ordered as well as a
   1.4 m light guide. A fine-mesh pmt as the photo-detector. They will
   study light yield and timing. The next step will be to bend the
   scintillator and compare performance with the straight version and with
   GEANT4 simulations. They will also work on design of tooling do to the
   bending.

   Read-out will have to include FADC channels in order to incorporate
   signals into the trigger pipeline.

   There was a lot of discussion about various requirements for start
   counter performance. In general we need to have agreement on the
   overall goals for the detector. Among these goals are:
     * input to trigger
     * RF bucket identification
     * part of time-of-flight particle ID scheme
     * particle ID via dE/dx

   These issues had been raised by Werner in a phone conversation with
   Mark on Thursday.

Start Counter Rates

   Seema and Sascha have been studying the electromagnetic background in
   the start counter. There will be a GlueX note on this subject soon.
   They see the following:
   inner radius (cm) rate per counter (kHz)
   1.0               400
   2.0               160
   3.0               120
     __________________________________________________________________

   recorded by [19]Mark I.

   Retrieved from
   http://www.jlab.org/Hall-D/software/wiki/index.php/Time-of-Flight/Start-Counter_Meeting%2C_April_17%2C_2009

  16. http://www.jlab.org/Hall-D/software/wiki/index.php/TOF-17Apr09
  19. http://www.jlab.org/Hall-D/software/wiki/index.php/User:Marki