Sep 17, 2009 Calorimetry

Meeting will be dedicated to Calibration and Monitoring

Teleconference Time: 11:00 a.m. EST

• ESNET and EVO session
• Phone:
  • +1-800-377-8846 : US
  • +1-888-276-7715 : Canada
  • +1-302-709-8424 : International
  • then enter participant code: 77438230# (remember the "#"). Note: code changed 7/2/09

Items for followup from previous meeting(s)

1. Two components fit for fiber attenuation (Zisis)
2. Requirement of hardware gain matching of pmts for Fcal (and also Bcal)

Tentative Agenda

1. Announcements
2. Review of Action Items
3. Calibration/Monitoring
4. Fcal
5. Bcal
   • Readiness Review (Oct 7)
6. BCAL Readout
   • Update on SiPM schedules (Elton)
   • Update from Alam on raytracing simulations for FMPMT design
7. Simulation
8. Other business

Minutes

Attendees: JLab: Elton, John, Pawel, Eugene, Beni, IU: Matt, Mijahlo, Ryan, UofR: Zisis, Andrei, USM: Will, Alam

1. Announcements
   • Lehman Review next week
2. Review of Action Items
   • No update at this time
3. Calibration/Monitoring
   1. Eugene: Fcal activity on calibration is scheduled to start next month. We need to formally address it. Elton suggested creating a more realistic timeline for its implementation. Will discuss with project management and Eugene offline.
4. Fcal
   1. Contract response
      • John iterating on support frame. Key load-bearing tubes, currenlty Al, could they switch to iron? Tim needs to weigh in on this one.
      • Paul (Smith) is completing the drawings on the bases and will send them out for cost estimates in the next few days. Will get quotes for fabrication, stuffing and conformal coating (either as one contract or separate).
      • Need to discuss strategy for fabrication of boards. Paul is concerned primarily about the HV board. We should include Fernando and Chris on the discussion for suggestion of production.
      • Fastrack schedule: updating schedule for some items that are "as soon as possible" to "as late as possible". Elton mentioned that lags in the schedule (can be positive or negative) can also be used. Matt asked if Fasttrack has a facility for "resource leveling". Elton did not know of one.
      • We need to make sure that items in the schedule that are outside the contract (e.g. dark room, monitoring system, low voltage supplies) do not fall between the cracks. Elton suggested to include them in the schedule with JLab as the responsible party for delivery of those items.
      • QA plan needs also developing. The example from Regina exists and can be used as a model.
      • Magnetic shield tests? (Tim needs to provide feedback)
      • Jake is working on the FADC timing. Finishing off a technical note on the performance. Discussions with Hai and Chris are clarifying ways of including the timing algorithm into the hardware. A NIM draft of a paper will follow the technical note.
5. Calibration/Monitoring
   1. Eugene: Fcal activity on calibration is scheduled to start next month. We need to formally address it. Elton suggested creating a more realistic timeline for its implementation. Will discuss with project management and Eugene offline.
   2. Will clarified that from the collaboration meeting we favor LEDs over laser as a source. This could be presented at the Lehman review as a decision.
6. Bcal
   1. Readiness Review (Oct 7) will include a technical Readiness Review as well as a "vendor evaluation"
      • Tentative schedule will be to arrive early on Wed, perhaps tour Ross machining in the afternoon and spend most of Wed at UofR.
      • Itineraries are still open. Tentatively we are considering arriving noon on Wed and departing early on Thu.
      • Elton to contact JLab QA and procurement to find out what is required for the vendor evaluation. Do they need to meet with Financial and/or Research Services?
      • Need to outline a tentative agenda for the review
   2. Contract
      • Web page needs to be setup for communications. A mid-month report is also due. It can be information, but we need to keep consistent records. The site should be password protected.
      • Zisis will call Elton this afternoon at 3:00 pm to go over construction details. We will see if Tim is also available.
7. BCAL Readout
   1. Update on SiPM schedules (Elton)
      • A recent e-mail from Sensl reports that they are having problems with making connections on the ceramic substrate and will be delayed by about 5-6 weeks in the delivery of their arrays.
   2. Update from Alam on raytracing simulations for FMPMT design
      • Continuing to develop light guide simulations. The guides have a trapezoidal section followed by a toroidal section. Most of the losses are seen in the trapezoidal section.
      • Checking efficiency of the outer segments that have reduced light efficiency.
      • Slide 9: Plot of efficiency vs Radius, shows that full efficiency can be reached for output radii of > 2 cm.
      • Slide 8: Matt: It appears there is a hard cutoff at an angle of 20deg and reduced efficiency shows up only because the efficiency is plotted for angles between zero and a maximum. Suggestion: Plot efficiency vs. a specific angle to understand behavior.
      • The optimum choice is the parabolic cone. However, other three geometries perform almost as well. The trapezoidal geometry is considerably worse.
      • Elton: Questions whether the orientation of the pmts relative to the field should be frozen. It was chosen where the tube shows the maximum sensitivity to the field orientation. Will: need to study tolerances of the orientation to field direction.
      • Matt: Will the simulations be done with more realistic input? Will: there are three projects in progress 1) ray tracing with ROOT (reported today) 2) parametric studies of wavelength dependence of reflection and transmission 3) full GEANT4 light guide simulations. [Soon to follow]
8. Other business