[Halld-pid] Time-of-Flight Meeting Minutes, June 13, 2017

[Mark Ito]

Please find the minutes below and on the wiki 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_June_13,_2017#Minutes>.

______________


    Minutes

Present:

  * *FSU*: Sasha Ostrovidov
  * *JLab*: Thomas Britton, Brad Cannon, Eugene Chudakov, Mark Ito
    (chair), Simon Taylor, Beni Zihlmann

There is a recording of this meeting <https://bluejeans.com/s/ytbmb/> on 
the BlueJeans site.


      Review of minutes from the previous meeting

We went over the minutes from May 30 
<https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_May_30,_2017#Minutes>. 


Beni mentioned that although he completed calibration pass through the 
Spring 2017 data with fine run segmentation, he has not revised the 
calibrations constants, derived from a previous pass, in the CCDB. We 
are very close to the final configuration for the next launch and there 
have been no problems reported with the current set of constants. His 
current plan is to hold off on updating the CCDB for now.


      Calibration Status

Brad and Beni have been reviewing our calibration procedures. Two areas 
could potentially improve performance.


        Time-Walk Correction

Beni is switching to a scheme where pulse amplitude is used in the walk 
correction rather than pulse integral area.

The current functional form does not do a great job of fitting the data. 
Beni is trying a fit to two independent regions of time vs. amplitude to 
get a better representation of the data. The next step is testing to see 
if there is any improvement.


        Energy Calibration

Brad is looking into a repeat of our energy calibration. Though the 
energy measurement from the TOF is not a critical quantity, the 
calibration has not been done for a while and needs an update.

Retrieved from 
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  * This page was last modified on 14 June 2017, at 09:22.

-- 
Mark Ito, marki at jlab.org, (757)269-5295

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