Difference between revisions of "December 21, 2007 Calorimetry"

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# '''Calorimetry Document Preparation'''
 
# '''Calorimetry Document Preparation'''
 
#* ''Resources'' Alex's draft [http://dustbunny.physics.indiana.edu/~dzierba/GX_calorimetry.pdf GX_calorimetry]).
 
#* ''Resources'' Alex's draft [http://dustbunny.physics.indiana.edu/~dzierba/GX_calorimetry.pdf GX_calorimetry]).
−
#** ''Intro'': [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=856 GlueX-doc-856] and [[Media:reminder2.pdf]]
+
#** ''Intro'': [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=856 GlueX-doc-856] and [[Media:reminder2.pdf]]
 
#** ''BCAL bullets'': [[Media:BCAL_Highlights.pdf]], ''FCAL list'': [[Media:CalorimetryOutlineDoc.pdf]]
 
#** ''BCAL bullets'': [[Media:BCAL_Highlights.pdf]], ''FCAL list'': [[Media:CalorimetryOutlineDoc.pdf]]
−
#** ''DocDB'': [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=840 BCAL Calorimetry Response], [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=842 BCAL Facts], [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=845 Amplitude Analysis], [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=924 SciFi Emission Spectra Analysis]
+
#** ''DocDB'': [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=840 BCAL Calorimetry Response], [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=842 BCAL Facts], [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=845 Amplitude Analysis], [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=924 SciFi Emission Spectra Analysis]
 
# '''FCAL Hardware/Software'''
 
# '''FCAL Hardware/Software'''
 
#* ''Light guides'': ongoing, update
 
#* ''Light guides'': ongoing, update
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#* No comments.
 
#* No comments.
 
# '''Calorimetry Document Preparation'''
 
# '''Calorimetry Document Preparation'''
−
#* ''Resources'':  
+
#* ''Resources'': The documents listed above are the source of most of the Calorimetry document.  Cut and Past action.
−
#* ''Status Quo'':
+
#* ''Status Quo'': Alex has the intro section in good shape.  George will deliver BCAL sections to Alex, and Beni, Mihajlo and Matt will have a draft of the FCAL Sections by the end of next week.
−
#* ''Timelines'':
+
#* ''Timelines'': Working backwards from a tentative review date of Feb 18, we will have the document (and associate documentation) to the reviewers by Feb 1.  Therefore, allowing the last week in January for final editing, we need to circulate the document to the Collaboration by Jan 18 and request feedback by the 25th.
−
#* ''Reviewers'':  
+
#* ''Reviewers'': Two reviewers are in the process of being contacted.  There may be a third.  The 12 GeV management will send them the terms of reference.  Elton sent out a pointer for the FDC review terms so that we can see what sort of things they contain (see /group/12GeVUpgrade/Reviews/Physics/Hall B & D Drift Chamber Reviews/).  See the attached document: [[Media:DCReview.doc]].
 
# '''FCAL Hardware/Software'''
 
# '''FCAL Hardware/Software'''
−
#* Mihajlo has been generating gp->b_1pi0  and f_1pi0 (all neutral) final states for reconstruction studies. The learning curve on high multiplicity events is taking more time than anticipated. Hopes to have results to show soon.
+
#* Mihajlo reported on the reconstruction. A difficult channels with 8 neutrals is being looked at as a worse case scenario.
−
#* Alex mentioned that a comparison of Mihajlo's reconstruction with his parametric simulation has been conducted and agrees well. The input of photon detection for the parametric MC was parameterized from Mihajlo's output. For a_0 and a_2 production the realistic acceptance is about 30-35% and agrees between the two analysis. This reconstruction has been updated since the collaboration meeting where a 40% reconstruction efficiency was reported.
+
#* Beni reported that one of the students is working on the light guide tests report.
−
#* The reconstructed masses of pi0 is about 10-11 MeV, eta is 35 MeV. The widths agree between full reconstruction and MC. For photons that hit the Fcal only, the pi0 width is about 7 MeV and photons that hit the Bcal only the width is about 11 MeV.
+
 
# '''BCAL Hardware/Software'''
 
# '''BCAL Hardware/Software'''
−
#* George reported on the SiPM work. Two new results will be posted to the portal shortly. Conclusions from the Phase I tests are
+
#* George and Zisis reported on the SiPM work. New examination of defects on the SiPM arrays by miscroscope as well as forward bias curves were carried out by Kathryn (see [[Private:BCAL_SiPM_Tests_2007#Bubbles_and_No_Troubles | Bubbles and no Troubles]]). The defects are not correlated with cells that have low amplitude.  The forward bias curves seem reasonable but do not point to any problems in the silicon. The suspect for the poor performance of the arrays remains the electro-mechanical assembly. These results will be transmitted to SensL.  
−
#** Quality of SiPMs fell below expectations, at least for these early units
+
#* SensL just sent their revised Phase-II proposal.  We will have an internal teleconference on Jan 2 or 3 to discuss it before replying to them.
−
#** Factor of 2 variation in gain which is not acceptable
+
#* Elton has gotten a handle on Blake's light ray tracing, to simulate the outer layer light guides (see histos in above link).  Matt mentioned that GlueX-doc-656 is a good resource for these studies.  Elton will continue and let Zisis know if GuideIt will be needed for these simulations.
−
#** The sensor tiles showed extreme sensitivity of electronics to external parameters, such as the power supply and noise. Large pedestal widths are due mainly to the electronics.
+
# '''Next meeting''': the next calorimetry group meeting is scheduled for January 4.
−
#** Tested tiled arrays provide a proof-in-principle of use of detection over a large area, but characteristics are below specifications.
+
−
#** Carl asked for the voltage used for the reported tests: The breakdown voltate was 27.3 V, operation was about 28.8 V or about 1.5 V above breakdown.
+
−
#** SensL initially did not believe the large gain variations measured, but UofR measurements are reproducible and seem to stand up.
+
−
#** SensL has asked UofR to make further tests, specifically to check the connectivity from cell-to-cell, with they will do.
+

Latest revision as of 17:00, 24 February 2017

Connection

  • The meeting will be held at 10:00 EST (9:00 CST)
  • Phone:
    • +1-800-377-8846 : US
    • +1-888-276-7715 : Canada
    • +1-302-709-8424 : International
    • then enter participant code: 39527048# (remember the "#")

Agenda

  1. Previous minutes: December 14, 2007 Calorimetry
  2. Calorimetry Document Preparation
  3. FCAL Hardware/Software
    • Light guides: ongoing, update
    • Low energy threshold: cosmics/Cherenkov: ongoing, update
    • Hadronic backgrounds: ongoing, update
  4. BCAL Hardware/Software
  5. Any other business

Minutes

Attendees: Alex, Matt, Beni, Mihajlo (Indiana), Elton, Tim (JLab), Elke (DESY), George, Zisis (Regina)

  1. Previous minutes: December 14, 2007 Calorimetry
    • No comments.
  2. Calorimetry Document Preparation
    • Resources: The documents listed above are the source of most of the Calorimetry document. Cut and Past action.
    • Status Quo: Alex has the intro section in good shape. George will deliver BCAL sections to Alex, and Beni, Mihajlo and Matt will have a draft of the FCAL Sections by the end of next week.
    • Timelines: Working backwards from a tentative review date of Feb 18, we will have the document (and associate documentation) to the reviewers by Feb 1. Therefore, allowing the last week in January for final editing, we need to circulate the document to the Collaboration by Jan 18 and request feedback by the 25th.
    • Reviewers: Two reviewers are in the process of being contacted. There may be a third. The 12 GeV management will send them the terms of reference. Elton sent out a pointer for the FDC review terms so that we can see what sort of things they contain (see /group/12GeVUpgrade/Reviews/Physics/Hall B & D Drift Chamber Reviews/). See the attached document: Media:DCReview.doc.
  3. FCAL Hardware/Software
    • Mihajlo reported on the reconstruction. A difficult channels with 8 neutrals is being looked at as a worse case scenario.
    • Beni reported that one of the students is working on the light guide tests report.
  4. BCAL Hardware/Software
    • George and Zisis reported on the SiPM work. New examination of defects on the SiPM arrays by miscroscope as well as forward bias curves were carried out by Kathryn (see Bubbles and no Troubles). The defects are not correlated with cells that have low amplitude. The forward bias curves seem reasonable but do not point to any problems in the silicon. The suspect for the poor performance of the arrays remains the electro-mechanical assembly. These results will be transmitted to SensL.
    • SensL just sent their revised Phase-II proposal. We will have an internal teleconference on Jan 2 or 3 to discuss it before replying to them.
    • Elton has gotten a handle on Blake's light ray tracing, to simulate the outer layer light guides (see histos in above link). Matt mentioned that GlueX-doc-656 is a good resource for these studies. Elton will continue and let Zisis know if GuideIt will be needed for these simulations.
  5. Next meeting: the next calorimetry group meeting is scheduled for January 4.
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