Difference between revisions of "January 25, 2017 Calibration"

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#** Skims: /cache/halld/RunPeriod-2016-10/calib
 
#** Skims: /cache/halld/RunPeriod-2016-10/calib
 
#** Histograms: /cache/halld/RunPeriod-2016-10/calib/hists/summed
 
#** Histograms: /cache/halld/RunPeriod-2016-10/calib/hists/summed
 +
#* Subdetectors
 +
#** [https://halldweb.jlab.org/wiki/index.php/Calibration_Dashboard#Startup_Checklist Calibration Checklist]
 +
#* [[PrivateWiki:Tracking_Alignment|Alignment]]
 +
# Simulations
 +
#* sim1.2 progress
 +
# AOB
 +
 +
== Minutes ==
 +
 +
Attending: Sean (NU); Simon, Mark D., Adesh, Eugene, Alex A., Thomas, Brad, Nathan, Mark I. (JLab); Curtis, Mike S., Will M., Naomi (CMU); Matt S. (IU); Justin (W&M); Mahmoud (FIU)
 +
 +
# Announcements
 +
#* Beam is expected next week.
 +
# [[GlueX-Collaboration-Feb-2017|Collaboration Meeting]]
 +
#* Some discussion of talks for Saturday session: Sean and Mark I. will give calibration/offline overview talks, detector talks should cover performance & simulation plans, Mike S. will give alignment talk in tracking session.
 +
#* Other suggestions welcome, Sean will look through his notes.
 +
# Calibration Updates
 +
#* Sean presented a brief update on the timing calibrations from the last run.  The TOF calibrations look good, with resolutions approaching their values from last Spring.    All the others have values from the calibration before the TOF recalibration, and the per-channel timing calibrations are not good.
 +
#** Studies of the SC have shown a couple curious features: (1) the propogation time corrections have clearly changed, in some cases by large amounts; (2) some paddles seem to have been calibrated to the wrong RF bin and have a +-2 ns offset.  For (2) it is not clear why this is the case, there may be some theta-dependent effect.  For (1) the cause is even more unclear, since the flash algorithm was supposedly essentially unchanged.  This is a sign that we carefully need to look at the calibrations for all f250-dependent detectors (i.e. all but the drift chambers).
 +
#** Most detectors are out of alignment with the RF in ~+-1 ns range.
 +
#** Sean will average out the SC offsets and rerun calibrations to hopefully get some better alignment.  Some more BCAL calibrations will be run, in collaboration with Mark Dalton.
 +
#** Curtis asked what beam frequency we will get in the upcoming run, and Eugene said that it would be at 250 Mhz since the RF separator will be used.  Note that this last run was at 500 Mhz.
 +
#** Matt pointed out that there is a difference in how the pedestals were calculated between the firmware, which is small but could be meaningful.
 +
#* The [[Calibration_Train#Fall_2016_Processing|Calibrations train]] is being updated for the new run, developments delayed due to resolving calibration issues.
 +
 
#* Subdetectors
 
#* Subdetectors
 
#** [https://halldweb.jlab.org/wiki/index.php/Calibration_Dashboard#Startup_Checklist Calibration Checklist]
 
#** [https://halldweb.jlab.org/wiki/index.php/Calibration_Dashboard#Startup_Checklist Calibration Checklist]

Revision as of 15:36, 25 January 2017

GlueX Calibration Meeting
Wednesday, January 11, 2017
11:00 am, EST
JLab: CEBAF Center, F326

Communication Information

Remote Connection

You can connect using BlueJeans using the meeting number 630 804 895 .       (Click "Expand" to the right for more details -->):

  1. Make sure you have created a BlueJeans account via your JLab CUE account using this link:

  2. Meeting ID: 630804895
    • (you may need to type this in, depending how you connect)

  3. If connecting via Web Browser: click this link (no passcode is needed):

  4. If connecting via iOS or Android App:
    • Use your JLab e-mail address to log in and then enter the meeting ID given above to join the meeting

  5. If connecting via Phone: Dial one of the following numbers and then enter the meeting ID above and hit "#" or "##"

  6. If connecting via Polycom unit:
    • Dial 199.48.152.152 or bjn.vc
    • Enter meeting ID above
    • Use *4 to unmute

Slides

Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2016 on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2016/ .

Calibration Tasks

  1. Spring 2016 Recon Checklist
  2. Mcsmear updates
  3. Data Validation
  4. GlueX Detector Performance Document

Upcoming Calibrations

  • Add timing information to FCAL clustering/inner ring calibrations? (Adesh/Matt S.)
  • BCAL TDC calibrations (Andrei)
  • TAGH alignment (Nathan)
  • Tagger energy map (Richard J.?)
  • TOF alignment (Beni/Simon)

Agenda

  1. Announcements
  2. Collaboration Meeting
  3. Calibration Updates
  4. Simulations
    • sim1.2 progress
  5. AOB

Minutes

Attending: Sean (NU); Simon, Mark D., Adesh, Eugene, Alex A., Thomas, Brad, Nathan, Mark I. (JLab); Curtis, Mike S., Will M., Naomi (CMU); Matt S. (IU); Justin (W&M); Mahmoud (FIU)

  1. Announcements
    • Beam is expected next week.
  2. Collaboration Meeting
    • Some discussion of talks for Saturday session: Sean and Mark I. will give calibration/offline overview talks, detector talks should cover performance & simulation plans, Mike S. will give alignment talk in tracking session.
    • Other suggestions welcome, Sean will look through his notes.
  3. Calibration Updates
    • Sean presented a brief update on the timing calibrations from the last run. The TOF calibrations look good, with resolutions approaching their values from last Spring. All the others have values from the calibration before the TOF recalibration, and the per-channel timing calibrations are not good.
      • Studies of the SC have shown a couple curious features: (1) the propogation time corrections have clearly changed, in some cases by large amounts; (2) some paddles seem to have been calibrated to the wrong RF bin and have a +-2 ns offset. For (2) it is not clear why this is the case, there may be some theta-dependent effect. For (1) the cause is even more unclear, since the flash algorithm was supposedly essentially unchanged. This is a sign that we carefully need to look at the calibrations for all f250-dependent detectors (i.e. all but the drift chambers).
      • Most detectors are out of alignment with the RF in ~+-1 ns range.
      • Sean will average out the SC offsets and rerun calibrations to hopefully get some better alignment. Some more BCAL calibrations will be run, in collaboration with Mark Dalton.
      • Curtis asked what beam frequency we will get in the upcoming run, and Eugene said that it would be at 250 Mhz since the RF separator will be used. Note that this last run was at 500 Mhz.
      • Matt pointed out that there is a difference in how the pedestals were calculated between the firmware, which is small but could be meaningful.
    • The Calibrations train is being updated for the new run, developments delayed due to resolving calibration issues.
  2. Simulations
    • sim1.2 progress
  3. AOB
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