Difference between revisions of "Oct 13, 2008 Calorimetry"

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(Tentative Agenda)
(Minutes)
 
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=Items for followup from Sep 29 meeting=
 
=Items for followup from Sep 29 meeting=
# Mijahlo will show slides for APS meeting at next meeting.
+
# Mijahlo will show [http://dustbunny.physics.indiana.edu/~mikornic/GlueX/fadc_dnp08_v2.pdf slides for APS meeting] at next meeting.
 
# Each subsystem must complete blanks in the [[Sep 2, 2008 Calorimetry#Calibration Specifications Table | Calibration Specification Table]].
 
# Each subsystem must complete blanks in the [[Sep 2, 2008 Calorimetry#Calibration Specifications Table | Calibration Specification Table]].
 
# Decision on Bcal sampling fraction needed if any changes are to be made to design. NEED A DEADLINE
 
# Decision on Bcal sampling fraction needed if any changes are to be made to design. NEED A DEADLINE
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=Minutes=
 
=Minutes=
Attending:
+
Attending:JLab: Fernando, Beni, Elton, Elke, Tim; Santa Maria: Serguei; UofR: Zisis, Andrei, Stamatis, Blake, George; IU: Matt, Mihajlo, Claire, Ryan; UofA: Jim.
 +
 
 +
# Announcements
 +
# [[Oct 15, 2008 Calorimetry | Visit to Alberta]]
 +
#* Travel and agenda discussed. Wiki page with meeting updated accordingly.
 +
# Fcal
 +
#* Mihajlo gave a practice talk for his talk at the APS. Slides are in relatively good shape. Suggestions were made for improvements.
 +
# Bcal
 +
#* Decision on lead thickness
 +
#** Zisis stated that a writeup of the studies on sampling fraction is being written. There are many plots and it will take some time to digest the information. The proposal is to make the writeup available to the working group and present findings after people have had time to take a look at it. It is clear that if any changes are made they will have a large impact on the construction, so the schedule is very tight.
 +
#* Roadmap to decision on Bcal readout [http://www.jlab.org/ccc/mail_archives/HALLD/halld-cal/msg00870.html e-mail]
 +
#** Zisis suggested that the e-mail be converted to a wiki page for ease of updates and tracking. (Elton agreed, see [[BCAL#Roadmap_toward_a_decision_for_Bcal_Readout| Outcome]]).
 +
#* [[Media:Innergeometry.pdf | Updates on resolution studies]] (Blake)
 +
#** Need to compare resolutions to requirements
 +
#** Matt suggested developing a "toy Monte Carlo" based on these resolutions that could plot pi0 mass resolutions. Nominal kinematics for a few channels should be generated. Blake indicated he is already working with a pi0-eta event generator. This could be a good place to start.
 +
#** Blake requested a specific (prioritized) list of plots results to work on.
 +
# Calibration
 +
#* Notes from Christina (she cannot make the meeting today): We have been able to shield the laser and have obtained very clean pulses,now we are checking on their stability.
 +
#* We discussed the question Christina had on geometry (directed to Tim) :will there be any space for the LED drivers or we should abandon this effort?Or should we try for smaller?
 +
#** Reviewing the LED board that Christina brought to the collaboration meeting, it appears that it will be difficult to accommodate the present size board. However, a thinner/narrower board, perhaps 0.5 to 0.75 the current size should be able to fit.
 +
#** Elke reiterated the question as to whether these new LEDs had sufficient long-term stability.
 +
#** Matt suggested that if the LED was mounted such that it could be viewed both by the near and the far-side pmt, then the drifts of LED vs readout could be tracked. Some of these tests could be conducted at UofR.
 +
#** Zisis suggested that more WCs be produced for these tests. More light guides could be useful as mechanical prototypes. However, it was realized that any mechanical assemblies should investigate actual shapes (not just square cross sections).
 +
#* No progress on filling in the [[Sep 2, 2008 Calorimetry#Calibration Specifications Table | Calibration Specification Table]].

Latest revision as of 12:39, 24 October 2008

NEW TIME Time: 11:15 ET.

  • Phone:
    • +1-800-377-8846 : US
    • +1-888-276-7715 : Canada
    • +1-302-709-8424 : International
    • then enter participant code: 39527048# (remember the "#")

Items for followup from Sep 29 meeting

  1. Mijahlo will show slides for APS meeting at next meeting.
  2. Each subsystem must complete blanks in the Calibration Specification Table.
  3. Decision on Bcal sampling fraction needed if any changes are to be made to design. NEED A DEADLINE
  4. Resolution studies (Blake)
    • Up-to-date geometry ONGOING.
    • Decreased threshold for FM pmts. ONGOING
    • Position resolution - understand dependence on granularity.
    • Different segmentation for the outer section. - LOWER PRIORITY
  5. Study impact of inactive material at the end of Bcal on acceptance.
  6. Add F100 rad hard glass to simulation. - New graduate student has been assigned this project.

Documents to Review

Media:Innergeometry.pdf

Tentative Agenda

  1. Announcements
  2. Calibration
    • Notes from Christina (she cannot make the meeting today): We have been able to shield the laser and have obtained very clean pulses,now we are checking on their stability.
    • One question which should be answered soon mainly from Tim:will there be any space for the LED drivers or we should abandon this effort?Or should we try for smaller?
    • Progress on filling in the Calibration Specification Table.
  3. Fcal
    • Mihajlo will show slides of his APS presentation on timing
    • Other updates
  4. Bcal
    • Decision on lead thickness -- Updates on sampling studies.
      • I do not think can afford the time to change the lead thickness. Comments?
    • Roadmap to decision on Bcal readout e-mail
    • Updates on resolution studies (Blake)
    • Visit to Alberta

Minutes

Attending:JLab: Fernando, Beni, Elton, Elke, Tim; Santa Maria: Serguei; UofR: Zisis, Andrei, Stamatis, Blake, George; IU: Matt, Mihajlo, Claire, Ryan; UofA: Jim.

  1. Announcements
  2. Visit to Alberta
    • Travel and agenda discussed. Wiki page with meeting updated accordingly.
  3. Fcal
    • Mihajlo gave a practice talk for his talk at the APS. Slides are in relatively good shape. Suggestions were made for improvements.
  4. Bcal
    • Decision on lead thickness
      • Zisis stated that a writeup of the studies on sampling fraction is being written. There are many plots and it will take some time to digest the information. The proposal is to make the writeup available to the working group and present findings after people have had time to take a look at it. It is clear that if any changes are made they will have a large impact on the construction, so the schedule is very tight.
    • Roadmap to decision on Bcal readout e-mail
      • Zisis suggested that the e-mail be converted to a wiki page for ease of updates and tracking. (Elton agreed, see Outcome).
    • Updates on resolution studies (Blake)
      • Need to compare resolutions to requirements
      • Matt suggested developing a "toy Monte Carlo" based on these resolutions that could plot pi0 mass resolutions. Nominal kinematics for a few channels should be generated. Blake indicated he is already working with a pi0-eta event generator. This could be a good place to start.
      • Blake requested a specific (prioritized) list of plots results to work on.
  5. Calibration
    • Notes from Christina (she cannot make the meeting today): We have been able to shield the laser and have obtained very clean pulses,now we are checking on their stability.
    • We discussed the question Christina had on geometry (directed to Tim) :will there be any space for the LED drivers or we should abandon this effort?Or should we try for smaller?
      • Reviewing the LED board that Christina brought to the collaboration meeting, it appears that it will be difficult to accommodate the present size board. However, a thinner/narrower board, perhaps 0.5 to 0.75 the current size should be able to fit.
      • Elke reiterated the question as to whether these new LEDs had sufficient long-term stability.
      • Matt suggested that if the LED was mounted such that it could be viewed both by the near and the far-side pmt, then the drifts of LED vs readout could be tracked. Some of these tests could be conducted at UofR.
      • Zisis suggested that more WCs be produced for these tests. More light guides could be useful as mechanical prototypes. However, it was realized that any mechanical assemblies should investigate actual shapes (not just square cross sections).
    • No progress on filling in the Calibration Specification Table.