Mar 17, 2011 Calorimetry
From GlueXWiki
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.
- Fcal construction
-
JLab to provide shipping guidelines to Matt
-
Tentative Agenda
- Announcements
- Starting next week, we will move the Bcal Readout meeting and Cal Working Group meetings to TUESDAY 11:00
- Review of Action Items
- Calibration
- BCAL
- Construction Status: builds, fibre QA
- First article testing (Yi) Result Page
- FCAL
- Construction Status: mechanical, bases - no report
- Drawings for Fcal structure (Tim) Sketches for comments on FCAL structure
- Simulations
- Readout segmentation (Andrei)
Minutes
Attending:Elton, Yi, Eugene, David, Tim, Beni, John (JLab); Zisis, Andrei (UofR); Will (USM); Christina (Athens),
- Announcements
- Starting next week, we will move the Bcal Readout meeting and Cal Working Group meetings to TUESDAY 11:00
- Review of Action Items
- Calibration
- Concept for Fcal settled
- Discussions on Bcal option underway
- Will present concept to this group at next meeting (Mar 29)
- Modifications include daisy-chaining LED boards together
- Use CAN bus to communicate with control boards
- Consideration for optimum placement of LED boards on detector, including possibly attaching 2 fibers to each LED
- UofR will come up with some sketches that can be passed on to our designers to verify geometry
- BCAL
- Construction Status: builds, fibre QA
- Construction proceeding well. Modules 33 and 34 are about 30-40% complete.
- Machining of Module 26 started Mar 15. Start delayed to allow large job from Alabama to be completed at Ross Machining.
- Schedule for shipping will be updated once two modules are finished. Expect two shipments, one at the beginning of April, one at the end.
- In view of the disaster in Japan, they have assessed the inventory of fibers. They have in hand 10 weeks of fibers in stock.
- First article testing (Yi) Result Page
- Received 80 first-article samples from Hamamatsu last Wed.
- To date 25 units have been tested, but results are still under evaluation
- Test use a calibrated LED and five light settings using a neutral density filter.
- Gain measurements are relative, absolute calibration not yet completed.
- Rates normalized to 25deg C (where Hamamatsu specifies the units). Dark rates are about 16 MHz/array, about 4 times lower than original samples. Eugene would like to know what has changed in the fabrication process.
- Tim: Have any dimensional checks been made?
- Zisis: Suggest that Yi add quick progress checklist on the wiki for easy reference of measurement status.
- Construction Status: builds, fibre QA
- FCAL
- Construction Status: mechanical, bases - no report
- Drawings for Fcal structure (Tim) Sketches for comments on FCAL structure
- Following the last meeting, Tim, Wayne, Matt and John met to go over details
- Decision to stiffen support structure. Tim and Wayne have had discussions with designers of the support frame for the JLab Big-Cal support structure, who provided feedback to our concept
- IU will build a prototype to test the layout with two rows of 20 bars, which will take 4 weeks.
- Fabrication of parts will follow after incorporating feedback from the prototype.
- Simulations
- Readout segmentation (Andrei)