Jun 15, 2017 Calorimeter

Video Conferencing Information

Meeting Time: 11:00 a.m.

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Participant Direct Lines

• JLab Phone in CC L207 is 757-269-7084 (usual room)
• JLab Phone: in CC F326 is 757-269-6460
• Phone in the Regina Video-conference Suite is 306-585-4204
• Athens Phone: in Christina's office is 011-30-210-727-6947

Action Items

1. Get power supply specs from Paul Smith and provide to Chris/Nick Paul has sent information to Chris and Nick

References

1. FCAL HDFCAL log book
2. BCAL HDBCAL log book

Tentative Agenda

1. Announcements
2. Action Items
3. Activities during the down
   • VME electronic crates have been shutdown. Auxiliary systems and trigger crates are still on.
4. FCAL update (e-mail from Matt)
   • Unfortunately, I won't be able to make the meeting tomorrow.
   • Analysis of LED data continues in order to study time stability.
   • We also now have a nice EVIO skim exclusive omega events. This will be used to look at extra showers in the calorimeter, either from noise or hadronic splitoffs. It can also be used to study techniques to improve timing resolution by looking at the time difference of the two showers that make the pi0.
   • Jon continues his work with efficiency studies.
5. BCAL update
6. Calibrations
   1. GlueX-doc-2618 Update on Low Level Calibration Constants (Elton)
7. Reconstruction and Simulation
   1. Charged Particle Clusterizer (Will)
8. NIM articles
9. Any other business

Minutes

Attendees: Elton, Mark, Adesh (JLab); Zisis, Andrei, Tegan, Ahmed (UofR); Christina, George (Athens); Sean (NW); Will (CMU)

1. Announcements
2. Action Items
3. Activities during the down
   • VME electronic crates have been shutdown. Auxiliary systems and trigger crates are still on.
   • Tegan and Zisis recorded a collection of LED data to study pedestal widths vs SiPM bias voltage, and also runs with single bias lines on to enable single SiPMs.
   • Ahmed is preparing to analyze the data. He has obtained code that Mark used for similar studies in 2014 and got them to work, but has not yet started looking at data systematically. Can show data at the next meeting.
4. FCAL update
   1. e-mail from Matt
      • Unfortunately, I won't be able to make the meeting tomorrow.
      • Analysis of LED data continues in order to study time stability.
      • We also now have a nice EVIO skim exclusive omega events. This will be used to look at extra showers in the calorimeter, either from noise or hadronic splitoffs. It can also be used to study techniques to improve timing resolution by looking at the time difference of the two showers that make the pi0.
      • Jon continues his work with efficiency studies.
   2. Timing calibration (Ahmed)
      • Timing for low intensity running seems to be ok and is being used for the upcoming production launch
      • The timing distributions for the high intensity running seem to be ok for neutral showers, but show anomalies in other topologies.
      • The suspicion was that the 4ns time offsets were to blame, but when these corrections were backed out, the anomalies remain.
      • It is unclear what the source of the problem is. Sean confirms that the time distributions have widened considerably.
      • Adesh and Sean are working to find the problem and fix it, but there should be sufficient time before we begin production on the high intensity runs.
   3. Geometry (Adesh)
      • The spacing between blocks was noted at a previous meeting to be incorrect in the geometry.
      • The new FCAL needs to be implemented and pull out some hard-coded values out of the code. Once the geometry is fixed, the gains and non-linearity corrections need to be revised.
      • Adesh will make changes once the timing has been settled.
5. BCAL update
6. Calibrations
   1. GlueX-doc-2618 Update on Low Level Calibration Constants (Elton)
      • Elton updated low-level calibrations document to reflect latest use and definitions of these constants
      • Table 1
7. Reconstruction and Simulation
   1. Charged Particle Clusterizer (Will)
8. NIM articles
9. Any other business