BCAL Installation Schedule

Agenda

• BCAL schedule and activities for 2013
• Reconstruction efforts

Minutes

Attendees: Elton, David (JLab); George, Zisis, Shaun, Andrei (UofR)

Elton gave a detailed overview of the current and planned BCAL activities and timetables.

1. 13 LGs have been glued so far. The newest glue batch had problems curing. A new batch arrived today and will be evaluated. Techs are trained for the gluing. Three persons are needed to do the job, including prep work. Shaun's trips to JLab alleviate the pressure on the techs, who can then turn to other tasks. The current gluing pace is 4 modules per week, so with 35 modules remaining we need 9 weeks more to finish. If all goes well, this should be completed by mid May.
2. Mechanical process:
   1. Inspect LGs and glue them.
   2. Form the tedlar covers and tape them onto the LGs.
   3. Mount the LEDs. Inspect them visually (10 V, 100kHz rate).
   4. Move module to test station and use mini BCAL hardware. The final hardware is not quite ready. The alignment jig will arrive this week.
   5. Subassemblies (into the readout module). Copper cooling pipes are bent with a jig, fastened to the cooling plate with two brackets and the glued/soldered into place. The brackets stay on. Four thin termistor boards go on the cooling plate again in thermal contact.
   6. Other pres are needed but nobody has been assigned to them yet.
   7. Electrical guys will prepare boards.
   8. SiPMs sorted into bins and physically separated. 1000 units are still not at JLab, 360 that were returned to Japan from Chile were sent to JLab and left today for Chile. This delay may cause a problem in connection to the sorting and finding 40 units for each end.
3. Magnet has delays. It is at 80 K, compressor fixed, one leak fixed, one small one still exists. Refrigerator is cooling down, no He yet. The plan is too cool it down, see if all ok and then warm it up to 80 K while the BCAL is being installed.
4. BCAL modules can start being loaded into the cradle on the floor. This will relieve congestion on the Hall floor.