Difference between revisions of "JEF meeting, September 3, 2021"

From GlueXWiki
Jump to: navigation, search
(→‎Agenda)
Line 28: Line 28:
 
#[https://halldweb.jlab.org/DocDB/0052/005239/004/glue-jefxd-igal-jaegle-03092021.pdf \eta \to \gamma\gamma\pi^0]
 
#[https://halldweb.jlab.org/DocDB/0052/005239/004/glue-jefxd-igal-jaegle-03092021.pdf \eta \to \gamma\gamma\pi^0]
 
* Simulations
 
* Simulations
 +
 +
=Minutes=
 +
Attendees: Igal,Varun,Phil,Jane,Liping,Sasha,Arshak,Jon,Zisis,Bill,Olga,Susan,Tim B.,S.T.
 +
* No news from SICCAS: still waiting for results of test crystals with new powder
 +
* Module fabrication (on hold for now, but components are available)
 +
** Received brass flanges
 +
** Received samples of 50 micron thick brass straps, doing stress tests: strength double old 25 micron thick strips
 +
* Sasha put CCAL in trigger, tested using LED
 +
* CCAL dividers draw higher current than before:  head dissipation in principle could be issue, but chiller seems to handle this well enough (could be tuned)
 +
* Igal gave an update on his continuing π0γγ single+background analysis
 +
** Need to suppress large peaking background due to η→2γ
 +
*** If due to conversions, suggestion was that perhaps TOF veto might help?
 +
** Working with Chase to use BDT in TMVA package to try to separate signal from background
 +
** Double π0 cut (+/-6σ& removes 50% of signal
 +
*** Working on simulation using amptools
 +
** Cross section estimate 25% lower than Jon's
 +
*** Estimate 50% of Laget prediction
 +
*** If holds, ~3x higher flux required to get 50M tagged η's in 100 days

Revision as of 08:15, 7 September 2021

Meeting time and location= 9:30 am EST (JLab time) Bluejeans only


Connection instructions

We are using BlueJeans Video/Audio conferencing. Our meeting ID number is 992533564. Click "Expand" for more details.

  • Make sure you have created a BlueJeans account via your JLab CUE account using this link:
  • If connecting via Web Browser: click this link (no passcode is needed):
  • If connecting via Phone: Dial one of the following numbers and then enter the meeting ID above and hit "#" or "##"
  • If connecting via Polycom unit:
    • Dial 199.48.152.152 or bjn.vc
    • Enter meeting ID above

Agenda

  • SICCAS crystals
  • Module fabrication
  • COMCAL tests, TAC running, etc.
-Testing CCAL -- Sasha
  • Data analysis
  1. \eta \to \gamma\gamma\pi^0
  • Simulations

Minutes

Attendees: Igal,Varun,Phil,Jane,Liping,Sasha,Arshak,Jon,Zisis,Bill,Olga,Susan,Tim B.,S.T.

  • No news from SICCAS: still waiting for results of test crystals with new powder
  • Module fabrication (on hold for now, but components are available)
    • Received brass flanges
    • Received samples of 50 micron thick brass straps, doing stress tests: strength double old 25 micron thick strips
  • Sasha put CCAL in trigger, tested using LED
  • CCAL dividers draw higher current than before: head dissipation in principle could be issue, but chiller seems to handle this well enough (could be tuned)
  • Igal gave an update on his continuing π0γγ single+background analysis
    • Need to suppress large peaking background due to η→2γ
      • If due to conversions, suggestion was that perhaps TOF veto might help?
    • Working with Chase to use BDT in TMVA package to try to separate signal from background
    • Double π0 cut (+/-6σ& removes 50% of signal
      • Working on simulation using amptools
    • Cross section estimate 25% lower than Jon's
      • Estimate 50% of Laget prediction
      • If holds, ~3x higher flux required to get 50M tagged η's in 100 days
Retrieved from "https://halldweb.jlab.org/wiki/index.php?title=JEF_meeting,_September_3,_2021&oldid=106754"