Difference between revisions of "July 1, 2015 Calibration"

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# Announcements
 
# Announcements
 +
# Subdetector Reports
 +
#* [[FCAL timing 7/1/15]]
 +
# [https://halldweb.jlab.org/wiki/images/c/c7/CalibMtg_July01.pdf Detector Matching]
 +
# [[Spring_2015_Commissioning_Simulations|Simulations]]
 +
# [[Calibration_Train|Calibration Processing]]
 +
#* Run quality criteria
 +
# AOB
 +
 +
== Action Items ==
 +
 +
* Produce updated plots and performance numbers, preferably within a week.
 +
 +
== Minutes ==
 +
 +
Attending: Sean (NU); Curtis, Mike S., Will M., Naomi (CMU); Simon, Adesh, Beni, Matt, Kei, Mahmoud, Justin, Eric, Alex B., Fernando, Luke, Mark I., Paul, Elton, Mark D.
 +
 +
=== Announcements ===
 +
 +
* The JLab S&T review will be at the end of the month, so updated plots showing detector calibration and performance and updated numbers for resolutions and efficiencies are needed.  Matt suggested producing one slide per subdetector, including PDF files for each figure and some rough text summarizing the overall status and contents of the figures.  This information can be adapted by the various speakers as needed, and is needed by mid-next week.
 +
* The next offline monitoring run is planned for this coming Monday, July 6.
 +
 +
=== FCAL ===
 +
 +
* Simon showed results of a study using tracks matched to FCAL showers to extract relative timing offsets for FCAL blocks.  pion/proton separation is seen.
 +
** Matt pointed out that there were timing offsets extracted from LED data already in the CCDB, but they were overwritten during recent timing updates.  Adesh and Simon will compare these two results.
 +
** Simon mentioned that these studies were motivated by noticing that sometimes a cluster will be reconstructed by two different hits in the same block with different times.  Matt agreed that this should be studied.
 +
* Matt and Adesh are investigating the non-linear energy-dependent corrections and plan to have updated constants installed in the CCDB by the upcoming offline monitoring run, along with update gain calibrations.
 +
 +
=== BCAL ===
 +
 +
* Elton reported that George is converging on some results for his studies of effective velocities. 
 +
** Another output of this procedure is relative time offsets between the upstream and downstream channels.  The procedure uses ADC times.  It was agreed that calibrating absolute time offsets for the individual channels was a next step to take.
 +
** Curtis asked if TDC times were being analyzed, and Elton responded that the first step in using these is to determine the timewalk corrections for each channel.  Noemi from Regina is working on these, but does not have results from data yet.
 +
 +
=== CDC/FDC ===
 +
 +
* Simon is updating his CDC alignment.  He hasn't sent his results to Mike S. yet, but promises to do soon.
 +
* Mike S. is checking his CDC alignment results using Millipede with simulated data, and has removed several features from the results (e.g. oscillations in a ring).  He is getting reasonable input/output agreement of the wire offsets, within 50um.
 +
* Lubomir was not here, so no FDC news.
 +
 +
=== TOF ===
 +
 +
* Beni is redoing his calibration results, since Simon pointed out a small problem with his code.  It was suggested that he use the common library functions for converting from TDC digitized time to uncalibrated time in physical units.
 +
* Now that the counting house is back online, Beni has resumed his studies into the fADC data.
 +
 +
=== Start Counter ===
 +
 +
* Eric listed a number of projects he is working on:
 +
** Adding in the use of the attenuation factors to the reconstruction code
 +
** Seeing if the propagation time corrections derived from bench measurements or beam data best minimize the difference between the Start Counter and RF times, in order to decide which corrections to use.
 +
** Obtained new timewalk corrections.  These are very similar to the timewalk corrections previously obtained, but are obtained with a new fitting procedure that produces more regular, stable results.
 +
 +
=== TAGH/TAGM ===
 +
 +
* Alex B. is looking into using the tagger/PS energies to obtain efficiencies from the data.  An updated PS magnet map is needed for the most accurate results.  No new news from Alex Somov on this front.
 +
 +
=== Other Issues ===
 +
 +
*
 +
 
# Subdetector Reports
 
# Subdetector Reports
 
#* [[FCAL timing 7/1/15]]  
 
#* [[FCAL timing 7/1/15]]  

Revision as of 17:09, 1 July 2015

GlueX Calibration Meeting
Wednesday, July 1, 2015
11:00 am, EDT
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/2015 on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2015/ .

Agenda

  1. Announcements
  2. Subdetector Reports
  3. Detector Matching
  4. Simulations
  5. Calibration Processing
    • Run quality criteria
  6. AOB

Action Items

  • Produce updated plots and performance numbers, preferably within a week.

Minutes

Attending: Sean (NU); Curtis, Mike S., Will M., Naomi (CMU); Simon, Adesh, Beni, Matt, Kei, Mahmoud, Justin, Eric, Alex B., Fernando, Luke, Mark I., Paul, Elton, Mark D.

Announcements

  • The JLab S&T review will be at the end of the month, so updated plots showing detector calibration and performance and updated numbers for resolutions and efficiencies are needed. Matt suggested producing one slide per subdetector, including PDF files for each figure and some rough text summarizing the overall status and contents of the figures. This information can be adapted by the various speakers as needed, and is needed by mid-next week.
  • The next offline monitoring run is planned for this coming Monday, July 6.

FCAL

  • Simon showed results of a study using tracks matched to FCAL showers to extract relative timing offsets for FCAL blocks. pion/proton separation is seen.
    • Matt pointed out that there were timing offsets extracted from LED data already in the CCDB, but they were overwritten during recent timing updates. Adesh and Simon will compare these two results.
    • Simon mentioned that these studies were motivated by noticing that sometimes a cluster will be reconstructed by two different hits in the same block with different times. Matt agreed that this should be studied.
  • Matt and Adesh are investigating the non-linear energy-dependent corrections and plan to have updated constants installed in the CCDB by the upcoming offline monitoring run, along with update gain calibrations.

BCAL

  • Elton reported that George is converging on some results for his studies of effective velocities.
    • Another output of this procedure is relative time offsets between the upstream and downstream channels. The procedure uses ADC times. It was agreed that calibrating absolute time offsets for the individual channels was a next step to take.
    • Curtis asked if TDC times were being analyzed, and Elton responded that the first step in using these is to determine the timewalk corrections for each channel. Noemi from Regina is working on these, but does not have results from data yet.

CDC/FDC

  • Simon is updating his CDC alignment. He hasn't sent his results to Mike S. yet, but promises to do soon.
  • Mike S. is checking his CDC alignment results using Millipede with simulated data, and has removed several features from the results (e.g. oscillations in a ring). He is getting reasonable input/output agreement of the wire offsets, within 50um.
  • Lubomir was not here, so no FDC news.

TOF

  • Beni is redoing his calibration results, since Simon pointed out a small problem with his code. It was suggested that he use the common library functions for converting from TDC digitized time to uncalibrated time in physical units.
  • Now that the counting house is back online, Beni has resumed his studies into the fADC data.

Start Counter

  • Eric listed a number of projects he is working on:
    • Adding in the use of the attenuation factors to the reconstruction code
    • Seeing if the propagation time corrections derived from bench measurements or beam data best minimize the difference between the Start Counter and RF times, in order to decide which corrections to use.
    • Obtained new timewalk corrections. These are very similar to the timewalk corrections previously obtained, but are obtained with a new fitting procedure that produces more regular, stable results.

TAGH/TAGM

  • Alex B. is looking into using the tagger/PS energies to obtain efficiencies from the data. An updated PS magnet map is needed for the most accurate results. No new news from Alex Somov on this front.

Other Issues

  1. Subdetector Reports
  2. Detector Matching
  3. Simulations
  4. Calibration Processing
    • Run quality criteria
  5. AOB
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