Difference between revisions of "Mar 29, 2011 Calorimetry"
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## Construction Status: builds, fibre QA | ## Construction Status: builds, fibre QA | ||
## First article testing (Yi) | ## First article testing (Yi) | ||
− | # [http://www.jlab.org/ | + | # [http://www.jlab.org/Hall-D/software/wiki/images/c/c5/Uofr_cal_meeting110329.pdf Simulations] |
=Minutes= | =Minutes= | ||
Line 59: | Line 59: | ||
## First article testing (Yi) | ## First article testing (Yi) | ||
##* Completed testing 40 units | ##* Completed testing 40 units | ||
− | ##* Checked calibration of QDC. Gain of samples is about 6x10^5 instead of 7.5^10^5, expected | + | ##* Checked calibration of QDC. Gain of samples is about 6x10^5 instead of 7.5^10^5, expected for nominal Hamamatsu voltages. |
− | ##* | + | ##* Measured the gain vs voltage for normalization |
− | # [http://www.jlab.org/ | + | ##* For increased gain, the dark rates increase by about 30-40%, still below the rates from the original samples |
+ | ##* Results are being updated with calibrated gains. | ||
+ | ##* Tim: Check the apparatus with early samples to qualify test setup. | ||
+ | ##* After verifying that all checks have been completed, send 10 units to UofR and 10 to USM. | ||
+ | ##* Proceed with radiation tests of several samples to check response compared to previous samples. | ||
+ | # [http://www.jlab.org/Hall-D/software/wiki/images/c/c5/Uofr_cal_meeting110329.pdf Study of BCal Segmentation with BCal Reconstruction Code. Part 2: Angular Resolution] (A.Semenov for UofR group) | ||
+ | ## Studied angular resolution, assuming known vertex (center of target) | ||
+ | ##* Reconstructed theta angle for summed configuration about 2x worse than for fine segmentation | ||
+ | ##* Reconstructed phi angle about the same for both summed and fine segmentations | ||
+ | ##* Beni: How is the timing determined for summed configuration? Matt: times are energy weighted averages of the time of individual cells | ||
+ | ##* Matt: Noted that recent discussions on listservers noted that the function of the primary flag has changed. Does not think it would change results, but should be verified | ||
+ | ##* Eugene: At 90deg the timing of both situations should be very similar, but are not. Suggest checking this configuration, and once understood, moving to other cases | ||
+ | ## Elton: Asked whether the efficiency of reconstruction has been investigated. Andrei: not yet | ||
+ | ##* Matt: On the efficiency of reconstruction: Mihajlo studied this effect when the FDC design was being finalized. These results could be used as a reference. Of course, no study involving summing has been done yet. | ||
+ | ## Andrei: Careful control of software versions should be considered and documented, and extended to the use of flags. Studies should attempt to use tagged versions only. | ||
+ | ##* Matt: It is possible to use the revision number for any checkout from the repository as an identifier, although tagged releases are in fact preferable, because these are usually more stable. | ||
+ | ## New reconstruction code (Matt) | ||
+ | ##* Matt has written and checked new code for clusterizing. However, it is not yet tuned |
Latest revision as of 17:28, 17 August 2011
Teleconference Time: 11:00 a.m. EST
- ESNET (Number is 8542553) and EVO session (GlueX Calorimetry meeting room)
- JLab Phone: in CC F326 is 757-269-6337
- Regina Phone: in LB228 is 306-585-4204
- Athens Phone: in Christina's office is 011-30-210-727-6947
- Phone connection only upon request.
- +1-866-740-1260 : US+Canada
- +1-303-248-0285 : International
- then enter participant code: 3421244# (remember the "#").
- or www.readytalk.com (and code without the #)
Items for followup from previous meeting(s)
- Monitoring
- Fcal: check cross talk of calibration inputs across modules.
- Simulation
- Need to study the reconstruction efficiency.
-
Andrei will send David instructions for using summing and configuration files.
Tentative Agenda
- Announcements
- Starting this week, we will move the Bcal Readout meeting and Cal Working Group meetings to TUESDAY 11:00
- Review of Action Items
- Calibration
- FCAL
- Construction Status: mechanical, bases
- Drawings for Fcal structure (Tim)
- BCAL
- Construction Status: builds, fibre QA
- First article testing (Yi)
- Simulations
Minutes
Attending: Beni, Elton, John, Eugene, Tim, Lubomir, Yi (JLab); Will, Serguei (USM); Matt (IU); Zisis, Andrei (UofR).
- Announcements
- Starting this week, we will move the Bcal Readout meeting and Cal Working Group meetings to TUESDAY 11:00
- Review of Action Items
- Calibration
- FCAL
- Construction Status: mechanical, bases
- John and Steve have completed wrapping blocks. Shipment expected about April 18.
- Bases Status; Only 5 non-operational out of 500. 2 have a low clock speed creating difficulties communicating with CAN bus.
- 400 bases connected to CAN bus and operating smoothly
- Investigating what is poor assembly in preparation for order of 2500 remaining bases
- Company that built the 500 is increasing rates for the next 2500. IU is investigating options for bidding the large order, including possibly changing vendors.
- Discussions are ongoing related to CAN interface to slow control system
- Drawings for Fcal structure (Tim) Sketches for comments on FCAL structure
- Discussions on mechanical design completed with Tim and Wayne.
- Prototype under construction to validate the design.
- The beefed up structure, which allows the structure to be lifted whole, will be incorporated into the John's drawing package
- Construction Status: mechanical, bases
- BCAL
- Construction Status: builds, fibre QA
- Production all normal.
- Shipment of fibers arrived last week
- Modules 33-34 will be completed next week
- Machining of modules 24-28 proceeding well. Expect shipping to JLab second week of April, with 8th shipment following 2 weeks later.
- First article testing (Yi)
- Completed testing 40 units
- Checked calibration of QDC. Gain of samples is about 6x10^5 instead of 7.5^10^5, expected for nominal Hamamatsu voltages.
- Measured the gain vs voltage for normalization
- For increased gain, the dark rates increase by about 30-40%, still below the rates from the original samples
- Results are being updated with calibrated gains.
- Tim: Check the apparatus with early samples to qualify test setup.
- After verifying that all checks have been completed, send 10 units to UofR and 10 to USM.
- Proceed with radiation tests of several samples to check response compared to previous samples.
- Construction Status: builds, fibre QA
- Study of BCal Segmentation with BCal Reconstruction Code. Part 2: Angular Resolution (A.Semenov for UofR group)
- Studied angular resolution, assuming known vertex (center of target)
- Reconstructed theta angle for summed configuration about 2x worse than for fine segmentation
- Reconstructed phi angle about the same for both summed and fine segmentations
- Beni: How is the timing determined for summed configuration? Matt: times are energy weighted averages of the time of individual cells
- Matt: Noted that recent discussions on listservers noted that the function of the primary flag has changed. Does not think it would change results, but should be verified
- Eugene: At 90deg the timing of both situations should be very similar, but are not. Suggest checking this configuration, and once understood, moving to other cases
- Elton: Asked whether the efficiency of reconstruction has been investigated. Andrei: not yet
- Matt: On the efficiency of reconstruction: Mihajlo studied this effect when the FDC design was being finalized. These results could be used as a reference. Of course, no study involving summing has been done yet.
- Andrei: Careful control of software versions should be considered and documented, and extended to the use of flags. Studies should attempt to use tagged versions only.
- Matt: It is possible to use the revision number for any checkout from the repository as an identifier, although tagged releases are in fact preferable, because these are usually more stable.
- New reconstruction code (Matt)
- Matt has written and checked new code for clusterizing. However, it is not yet tuned
- Studied angular resolution, assuming known vertex (center of target)