Revision as of 11:14, 11 June 2009

Teleconference Time: 11:00 a.m. EST

• EVO session
• Phone:
  • +1-800-377-8846 : US
  • +1-888-276-7715 : Canada
  • +1-302-709-8424 : International
  • then enter participant code: 39527048# (remember the "#")

Items for followup from previous meeting(s)

1. Resolution studies
   • Study impact of inactive material at the end of BCAL on acceptance.
2. Documentation on fiber first-article
3. Review calibration procedures
4. Will: Noted from CLAS experience both oxides and carbonates can accumulate on lead. One type is worse than the other (will send references to UofR)
5. Elton will check on fiber delivery and comments from Kuraray on material for storage of fibers.

Documents to Review

Tentative Agenda

1. Announcements
2. Review of Action Items
3. Calibration
4. FCAL Update
5. BCAL Fabrication
   • Contract status
   • Construction prototype update
   • Fiber QA: Media:AttenLen_JS001-8_Prelim.png
   • Fiber measurements (Andrei)
6. BCAL Readout
   • Update from USM (Will)
     • Report from Alam/Sergey: Measurements of the effect of cooling on SensL SiPMs
   • VERY Budget comparisons (Elton)
   • Discussion of Bcal Readout Review (July 21)
     • Stefano Miscetti can participate in the review via video. A test of ESNET connection yesterday was very successful.
     • Other reviewers?
     • Agenda
7. Simulations
   • Quick look at Fluka results (Elton)
   • Energy deposition in the BCAL layers for PYTHIA events Media:sector_response.pdf

Minutes

Attendees:

1. BCAL contract: George carried out revisions suggested by Teresa Danforth on how to report "burdened" costs.
2. BCAL Construction
   • Installation of pressure lines and electrical has started.
   • Building of swager cubby hole delayed by 2-3 weeks. No impact on schedule in the absence of the second press.
   • Materials have been prepared for a last baby cal: this one 2m long, 12 cm wide, and with 20 layers. Dan machined an aluminum base plate for it, including the 1mm fiber guide groove. The first Pb sheet will be glued with industrial epoxy. This exercise is meant to accomplish:
     • Practice in gluing the first lead sheet to the Al plate with industrial epoxy.
     • Test the operation and use of the electropneumatic press.
     • Study of epoxy migration via staggered ram pressure over significant length.
     • First baby cal made using the press. Both ends will be machined and the resulting fiber pitch measured accurately. Use this information to finalize the roller gap for the Construction Prototype.
   • Lead for 3/4 of Construction Prototype has been prepared.
   • Fiber sorting will commence during the first week of July after fiber QA tests have been digested and vetted through the Cal WG. For the production modules QA testing and sorting will proceed in parallel, in an assembly line fashion. Now we are being extra cautious since this is our first large batch of fibers.
   • First four gallons of Bicron 600 glue are on their way. Assuming they arrive by the end of the month construction
   • All other supplies for construction are in hand.
   • Discussions and quotations from Ross and HydroMachine are well in hand.
3. Fiber QA Tests
   • Fiber Care
     • Wavelength spectra of room and desktop lamp lights were collected for both our Detector Lab (LB127 - where QA takes places) and Construction Lab (LB113 - where construction takes place). Filters are different but both cut out pretty much everything below 450 nm. Fibers are exposed for less than a minute to fluorescent hallway lights during the extraction from their cardboard boxes. This is done when pulling them out in order to always keep them straight and not bend them in handling; LB127 is less than 8m long. Overhead room lights in LB127 are kept off, and only 1-2 small incandescent lamps are used for lighting; these also have filters in them.
     • The fibers are always handled with cotton gloves and kept in their poly bags as much as possible.
     • We plan to purchase and install temperature and humidity sensors in both labs.
   • After experimenting with various containers/trays, we decided to cut up use the Kuraray cardboard boxes instead of the rain gutters for single, tested fibers, for ease in handling. The gutters are large and can handle fiber bags. We kept some cardboard boxes intact in case we need them for shipping fibers to JLab or (God forbid) back to Kuraray. Shelving (>4m long) has been erected in both LB113 and LB127 to hold fiber trays.
   • Procedure: No fiber enters LB113 until its batch has been approved after the QA. This avoids any confusion on which fibers can be used in the construction.
   • Over 100 fibers (0.3% of total or 30% of to-be-tested ones) have been measured for attenuation length using a calibrated Hamatsu photodiode and a picoammeter. Preliminary results have been posted on today's Wiki page. Fibers meet specs. Only one is near (but still over) the 300 cm mark. No. of p.e. tests will start next week.
4. ZP is back to working on fiber report and hopes to have a draft out during the week of June 22.