[Halld-pid] Time-of-Flight Meeting Minutes, August 25, 2015

[Mark Ito]

Flight Timers,

Please find the minutes below and at 
https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_August_25,_2015#Minutes 
.

   -- Mark
   _____________________________________

GlueX TOF Meeting, August 25, 2015

Minutes

Present:

FSU: Brad Cannon, Paul Eugenio, Sasha Ostrovidov, Aristeidis Tsaris
JLab: Mark Ito (chair), Simon Taylor, Beni Zihlmann

Run Preparation

We will likely run sometime in November.

Sasha is working now to set-up cosmic ray running. When he gets those 
runs going, we agreed that taking data will also have the benefit of 
having the detector ready for the run.

Sasha has consulted with Sergey Furletov on the set-up for stand-alone 
TOF runs. The current problem is lack of a working trigger. Sasha is in 
contact with Sascha Somov on this.

Review of minutes from August 11

We went over the minutes. Beni reported that Bryan Moffit's drivers for 
doing bin calibration of the CAEN TDCs have been released. We need to 
talk to Sergey Furletov to confirm and determine their location.

FADC charge resolution and NSB/NSA

Beni showed a plot from a study of the effect of various choices of NSB 
and NSA on pulse integral resolution for the TOF. For each combination 
of NSB/NSA, he fitted the distribution of the pulse integral for a 
single end of a single counter of the TOF. From the fits, he calculates 
the ratio of the width to the "mean" integral, basically the relative 
width of the minimum ionizing peak, and plots them. There is a large 
flat region at high NSA and low NSB where the resolution is not terribly 
sensitive to either parameter.

Sasha thought it would be interesting to repeat the study using the peak 
ADC value rather than the pulse integral.

Multi-Job Calibration

Brad has succeeded in submitted calibration jobs to the batch farm. He 
is currently working on combining the ROOT output of the jobs into a 
single file so he can run Beni's macro on it

ADC Gains

Sasha has confirmed Beni's observation that the central paddles seem to 
have higher than average gain. He will point us to the gain measurements 
done at FSU on the bench so we can cross-correlate.

Action Items

Confirm installation of Bryan M.'s drivers.
Get cosmic runs going.

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