Difference between revisions of "Fall 2019 Commissioning Meetings"

Revision as of 11:07, 19 December 2019

GlueX DIRC Meeting
Tuesdays and Thursdays, December 3-19
10:00 am, EDT
Hall D Counting House

To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 846453895.
To join via a Web Browser, go to the page [1] https://bluejeans.com/846453895 .
To join via phone, use one of the following numbers and the Conference ID: 846453895
- US or Canada: +1 408 740 7256 or
- US or Canada: +1 888 240 2560
More information on connecting to bluejeans is available.

Reconstruction of runs 70817-71073 almost complete (~8 billion of the 10 billion triggers collected so far):
- REST, histogram and tree files appearing at: /volatile/halld/home/gxproj7/RunPeriod-2019-11/dirc_monitoring/ver00
- Plan for data production over downtime
Summary of production datasets
LED analysis:
- Time over threshold analysis - Gain_eq (Andrew)
- Correlations between fibers and hit times (Bill)
- LED analyses [2] (Ahmed)

GEM update and analysis plans discussion
High rate studies:
- DAQ performance sufficient at 400 nA (nominal GlueX-II conditions)
- Plan to continue this overnight for more experience before January startup
Plans for shutdown:
- LED runs for HV/threshold scans on Friday after beam down
- LV and HV off over break, but no mechanical changes planned
Investigation of North OB in January:
- Proposal to drain North OB, inspect Bar Box 0 optical coupling to mirror box (misalignment?), inspect mirrors
- Beam could be back as early as January 7, so we can likely only observe the situation and seal things back up.

Initial data analyses (early runs 70817-70849):
- Standard halld_recon LUT: [3]
- FastDIRC: [4]
- LED analyses north box [5]
Total statistics around ~6 billion triggers so far, should get close to statistics we had last Spring (~10 billion total)
Upcoming plans:
- Remaining GEM data with focused FCAL trigger
- Additional DIRC threshold/gain/HV settings:
- High rate tests: paths to eliminate DIRC as bottleneck

Initial data (70817-70849) reconstruction complete:
- REST, histogram and tree files appearing at: /volatile/halld/home/gxproj7/RunPeriod-2019-11/dirc_monitoring/ver00
Waiting for runs 70937+ to be transferred to the /cache/ disk
VERY preliminary first look with FastDIRC
Upcoming plans:
- More GEM data with focused FCAL trigger
- High rate trigger/DAQ tests, including DIRC (Sasha)
- CPP test, 1 hr (David)

First field-on data Friday evening: Run 70817+
- Initial issues with timing now resolved and data processing some plots
- Initial data reconstruction underway:
  - REST, histogram and tree files appearing at: /volatile/halld/home/gxproj7/RunPeriod-2019-11/dirc_monitoring/ver00
Unfortunate data loss before accelerator vacuum issue: Run 70850-70895: https://logbooks.jlab.org/entry/3750309
LED Analysis: (Ahmed/Bill/Andrew)
Upcoming plans:
- When beam is back continue with nominal conditions: Threshold = pedestal + 100, equalized gains, HV = 1000 V
- Dedicated runs with GEM detector included with low trigger rate

Collected straight track data in "beam left" position: see correlations with TRD wire chamber and GEM SRS (APV) modules
- A couple runs with DIRC included for initial tests (70720 and 70721)
LED Analysis: (Ahmed/Bill)
Upcoming plans:
- Today/tonight: Straight track data in center and right positions by Friday morning.
- Friday: Ramp solenoid and setup for DIRC commissioning
- Weekend: DIRC commissioning with full solenoid field!

@@ Line 28: / Line 28: @@
 ** Time over threshold analysis - [https://halldweb.jlab.org/DocDB/0042/004295/001/DIRC_tot_slides.pdf Gain_eq] (Andrew)
 ** [https://logbooks.jlab.org/entry/3756210 Correlations between fibers and hit times] (Bill)
+** LED analyses [https://halldweb.jlab.org/wiki/images/0/0a/19Dec.pdf] (Ahmed)
 * GEM [https://logbooks.jlab.org/entry/3756231 update] and analysis plans discussion
 * High rate studies: