Difference between revisions of "Long term items"

From GlueXWiki
Jump to: navigation, search
(20 intermediate revisions by 2 users not shown)
Line 1: Line 1:
# FCAL: Fernando and co. converged on a plan for baserepairs: will take 25 weeks to complete the FCAL repair cycle (342 units) during SAD. (See Fernando's email from Sep 18, 2020.] Work is in progress: The first 100 bases are back in the FCAL now (Feb 2021).
+
# 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]
# 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 will undertake this task.
+
 
##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 is running photon, pi+, pi-, proton particle guns. 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. Tegan is now looking at Trajectory Point class, with help from Richard, Sean and Beni. This work is reported at HDGEANT meetings since December 1, 2020See meeting notes: https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meetings
+
# Covariance matrices for photons; need pull distributions (Regina could help); add these to best practices page [Mark]
 +
# Spike at BCAL z=220 cm, due to noise [Karthik]
 +
# Neutrons: revisit past work and move forward; could look at neutron efficiency in hyperon channels, etc. [Tegan et al.]
 +
# BCAL hot channelsInvestigate and see if baseline or other improvements are possible.

Revision as of 12:23, 12 October 2022

  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. Neutrons: revisit past work and move forward; could look at neutron efficiency in hyperon channels, etc. [Tegan et al.]
  5. BCAL hot channels. Investigate and see if baseline or other improvements are possible.