[Halld-pid] Time-of-Flight Meeting Minutes, July 28, 2015

[Mark Ito]

Folks,

Find the minutes below and at

https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_July_28,_2015

   -- Mark
   ___________________________________________________


GlueX TOF Meeting, July 28, 2015, Minutes

Present:

  * *FSU*: Hussein Al Ghoul, Paul Eugenio, Sasha Ostrovidov, Aristeidis
    Tsaris
  * *JLab*: Brad Cannon, Mark Ito (chair), Beni Zihlmann


Review of minutes from July 14

We looked at the minutes 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_July_14,_2015#Minutes>. 


No movement on the CAEN TDC bin calibration yet. Beni will talk to 
Sergey Furletov about installing Bryan Moffit library into the online 
system.

Calibration Status FSU

 1. Sasha trying to use reflections to get at time-walk corrections. He
    tried looking at pulses with two samples, but usually there are not
    TDC hits for the small reflections.
 2. Tried taking cosmic data, but the IOC's were down; he could not turn
    on the HV. Beni told us you have to re-start the IOC's from the
    near-top-level GUI. He will have a look at the system after the meeting.
 3. There was trouble starting the DAQ from gluon47. None of the windows
    came up. We suggested that Sasha consult with Sergey Furletov before
    attempting to start up the DAQ remotely. There may be conditions in
    the Hall that prevent doing so.


Calibration Status JLab

Beni led us through his wiki page 
<https://halldweb.jlab.org/wiki/index.php/TOF_Light_Attenuation> on 
light attenuation measurements from data. Please see the page for 
details and figures. In contrast to previous work, he tried fitting to a 
single exponential to facilitate comparison with the FSU bench results 
which also used a single exponential. He finds a mean attenuation length 
of 225 cm with an RMS spread of about 20 cm. This does not agree very 
well with the FSU results.

Sasha pointed out that the FSU measurements were made with a UV laser 
and were done with un-wrapped scintillator. Meaningful comparison may be 
difficult.

Calibration Training

Beni met with Brad yesterday. Brad will be at the lab for the next two 
weeks. They succeeded in building Beni's code in Brad's account and 
running the jobs on run 3180. Brad is going through the code now to 
understand the system.

He will subscribe to the PID and Calibration mailing lists and will 
attend the calibration meetings as well.

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