Difference between revisions of "Long term items"

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# FCAL: [orphan item] It has been noticed that the pi0 mass shifts when the LED pulser runs at high rate. This is still not understood. See [https://logbooks.jlab.org/entry/3595928 Log Entry 3595928] and references.  Several runs have been taken in raw mode.  These runs exhibit the shift in pi0 mass with LED running at 1 kHz.  There is a need to analyze these to try to determine the cause.  Susan will undertake this task.
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# FCAL: It has been noticed that the pi0 mass shifts when the LED pulser runs at high rate. This is still not understood. See [https://logbooks.jlab.org/entry/3595928 Log Entry 3595928] and references.  Several runs have been taken in raw mode.  These runs exhibit the shift in pi0 mass with LED running at 1 kHz.  There is a need to analyze these to try to determine the cause.  [Susan]
 
##50634 - FCAL Green LED: 1kHz, 29 V, Livetime is 9%, 1.7 M events
 
##50634 - FCAL Green LED: 1kHz, 29 V, Livetime is 9%, 1.7 M events
 
##50635 - FCAL Violet LED: 1kHz, 22 V, Livetime is 9%, 1.4 M events
 
##50635 - FCAL Violet LED: 1kHz, 22 V, Livetime is 9%, 1.4 M events
 
##50636 - FCAL Blue LED: 1kHz, 15 V, Livetime is 9%, 1.5 M events
 
##50636 - FCAL Blue LED: 1kHz, 15 V, Livetime is 9%, 1.5 M events
# Tegan's  work on comparing G3 (HADR1 and HADR4) and G4: he has run photon, pi+, pi-, proton particle guns, ρ events and π-Δ++ events. This effort started with Colin's [https://github.com/JeffersonLab/HDGeant4/issues/111#issuecomment-657062174 observations on acceptance for the eta-pi] and continued with Sean's [https://github.com/JeffersonLab/HDGeant4/issues/179 observations on proton timing], which Lubomir reported in J/psi production. Data vs MC tails look ok (in G4 and G3H4).  Work is ongoing: Tegan will look at Gaussian part of peaks (to see if tighter cuts can be used).  See plots at [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4878 GlueX-doc-DB] and [https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meetings HDGEANT4 meeting] notes.
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# Covariance matrices for photons; need pull distributions (Regina could help); add these to best practices page [Mark]
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# Spike at BCAL z=220 cm, due to noise [Karthik]
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# BCAL hot channels. Investigate and see if baseline or other improvements are possible; Regina summer undergrads could help.

Latest revision as of 12:47, 21 June 2023

  1. FCAL: It has been noticed that the pi0 mass shifts when the LED pulser runs at high rate. This is still not understood. See Log Entry 3595928 and references. Several runs have been taken in raw mode. These runs exhibit the shift in pi0 mass with LED running at 1 kHz. There is a need to analyze these to try to determine the cause. [Susan]
    1. 50634 - FCAL Green LED: 1kHz, 29 V, Livetime is 9%, 1.7 M events
    2. 50635 - FCAL Violet LED: 1kHz, 22 V, Livetime is 9%, 1.4 M events
    3. 50636 - FCAL Blue LED: 1kHz, 15 V, Livetime is 9%, 1.5 M events
  2. Covariance matrices for photons; need pull distributions (Regina could help); add these to best practices page [Mark]
  3. Spike at BCAL z=220 cm, due to noise [Karthik]
  4. BCAL hot channels. Investigate and see if baseline or other improvements are possible; Regina summer undergrads could help.