[Lowq] Minutes of the eg6 meeting on February 16

[Hovanes Egiyan]

  Minutes of the February 16 meeting


       From Lowqwiki

Present: Lamiaa, Bayram, Stepan, Carlos, Hovanes, F.-X., Yohann, Rafayel

On the phone: Raffaella

Notes by Hovanes.


    Contents

[hide <javascript:toggleToc()>]

    * 1 DC Calibration Progress
      <http://clasweb.jlab.org/rungroups/lowq/wiki/index.php/Minutes_of_the_February_16_meeting#DC_Calibration_Progress>
    * 2 Hodoscope status
      <http://clasweb.jlab.org/rungroups/lowq/wiki/index.php/Minutes_of_the_February_16_meeting#Hodoscope_status>
    * 3 CC calibration
      <http://clasweb.jlab.org/rungroups/lowq/wiki/index.php/Minutes_of_the_February_16_meeting#CC_calibration>
    * 4 TOF calibrations
      <http://clasweb.jlab.org/rungroups/lowq/wiki/index.php/Minutes_of_the_February_16_meeting#TOF_calibrations>
    * 5 RTPC calibrations
      <http://clasweb.jlab.org/rungroups/lowq/wiki/index.php/Minutes_of_the_February_16_meeting#RTPC_calibrations>
    * 6 Other
      <http://clasweb.jlab.org/rungroups/lowq/wiki/index.php/Minutes_of_the_February_16_meeting#Other>

[edit 
<http://clasweb.jlab.org/rungroups/lowq/wiki/index.php?title=Minutes_of_the_February_16_meeting&action=edit&section=1>]


    DC Calibration Progress

    * Bayram completed the first iteration, he put the constants from
      the fit into the database, and linked them in his private runindex.

    * The files from run 61695 were recooked with Bayram's new constants.

    * The next iteration will be done by fitting the residuals.

[edit 
<http://clasweb.jlab.org/rungroups/lowq/wiki/index.php?title=Minutes_of_the_February_16_meeting&action=edit&section=2>]


    Hodoscope status

    * We currently do not reconstruct the hits in the hodoscope.
    * We can use the constants from either e1-dvcs or eg1-dvcs.
    * Carlos will talk to F.X. and take a look at the calibrating
      procedure.
    * Stepan will send a link to the calibration procedure write-up.
    * Stepan will send the TCL keys and their calue to turn on SH
      reconstruction in user_ana.

[edit 
<http://clasweb.jlab.org/rungroups/lowq/wiki/index.php?title=Minutes_of_the_February_16_meeting&action=edit&section=3>]


    CC calibration

    * Hovanes compared the two constant sets from Mauri's two methods of
      calibrations.
    * There is approximately 5% disagreement between the numbers.
    * It would be useful to calibrate another run very close to the
      beginning of the eg6 run to see if the results matches the result
      from the dedicated CC calibration run.
    * Hovanes will talk with Maurizio.


[edit 
<http://clasweb.jlab.org/rungroups/lowq/wiki/index.php?title=Minutes_of_the_February_16_meeting&action=edit&section=4>]


    TOF calibrations

    * Lamiaa did the attenuation length calibrations.
    * The fits of the logarithm of the ratios of the signals at the two
      PMTs versus the hit position look reasonable.
    * Some of the plots had to be fitted manually.
    * Lamiaa will do the geometrical mean calibration next.

[edit 
<http://clasweb.jlab.org/rungroups/lowq/wiki/index.php?title=Minutes_of_the_February_16_meeting&action=edit&section=5>]


    RTPC calibrations

    * Yohann continues studying *sdist* distributions.
    * He was studying 1mm slices in z to look at the *sdist* distributions.
    * Stepan suggested to look at 0.5cm or 1cm slices since the vertex
      resolution is worse than 1mm.
    * Yohann showed reasonable distribution for the middle of the
      target, and some anomalies at one of the edges of the target. He
      will look to see if these anomalies exist at both ends.
    * So far there is no sign of significant deformation of the cathode
      foil.


[edit 
<http://clasweb.jlab.org/rungroups/lowq/wiki/index.php?title=Minutes_of_the_February_16_meeting&action=edit&section=6>]


    Other

    * Stepan suggested that for IC calibrations it might be useful to
      cook some of the empty target runs.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://mailman.jlab.org/pipermail/lowq/attachments/20100216/54bfba32/attachment.html