[Halld-pid] Start Counter Meeting Minutes, March 5, 2015

[Mark Ito]

Folks,

Please find the minutes below and at

https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_March_5,_2015#Minutes 
.

   -- Mark
______________________________________

GlueX Start Counter Meeting, March 5, 2015, Minutes

  * *FIU*: Mahmoud Kamel
  * *JLab*: Mark Ito (chair), Eric Pooser, Simon Taylor


Review of Minutes from the February 12 Meeting

We looked at the minutes 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Start_Counter_Meeting,_February_12,_2015#Minutes>. 


The cable swaps we had during the Fall run have been fixed and 
translation tables have been installed both for the swapped 
configuration we had and the correct configuration we have now.

Detector Status

The start counter is cabled up and ready to go for the Spring run. All 
Hot Check-out tasks are complete. The detector has been surveyed on the 
target cart and is now in the bore.

Calibration

Eric has been working on the time-walk calibration. He is doing 
comparisons with the corrections Simon obtained. The fitting procedure 
is done. He is looking for trigger dependence. The system is ready to 
obtain new corrections with new data when it comes in.

Mahmoud has been working on the correction for light propagation in the 
counters. He is dividing the counters into three regions: barrel, bend, 
and nose. He is comparing times from two counters hit in the same event, 
using tracking to determine the point where the particles cross the 
start counter. This is work in progress.

DAQ Tasks for Spring 2015 Commissioning Run

Eric, Mahmoud, and Werner Boeglin have come up with a list of tasks and 
issues 
<https://halldweb.jlab.org/wiki/index.php/DAQ_Tasks_for_Spring_2015_Commissioning_Run> 
for the upcoming run. We went over the entire list. Some items from the 
discussion:

  * Individual-channel discriminator thresholds will be possible this time.
  * Mark Dalton has a system for doing discriminator scans
    automatically. We would like to try it out for the start counter.
  * We need to ask if the online group is going to provide an automatic
    pedestal setting procedure for the F250s. If not we will have to
    adapt the procedure we used in the Fall.
  * We discussed increasing the time window, both for TDC and FADC hits.
    Eric found out that the FADCs can accommodate up to 4 hits per
    channel per event. We thought a large window would be good for that
    start counter since the channel count is so small.
  * Eric plans to re-write the online monitoring plugin. In particular
    he will have two plugins, one that relies on tracking and one that
    deals with only low-level quantities. An online efficiency
    calculation is planned for the tracking dependent plugin.
  * Eric will look into running the tracking-dependent plugin as part of
    the offline monitoring as a way to get started.


Meeting Time

We discussed moving the meeting time due to the now daily run planning 
meetings. 11:00 am was proposed, but no decision was reached.

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