February 13, 2013 Tracking CDC/FDC

Meeting Time and Place

Wednesday February 13, 2013 at 11:00am At Jefferson Lab, the meeting will be held in F326

Connections

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Hardware Agenda

1. Announcements
2. Collaboration Meeting
3. FDC Update
4. CDC Update
5. CDC HV Connectors and assembly.
6. CDC Testing

Minutes

Present: Curtis, Naomi, Beni, Simon, Lubomir, Eugene

1. Collaboration meeting
   1. 3 talks have been reserved for tracking
2. FDC Update
   1. Last production package (#2) completely tested. We started the installation of the grounding, will be followed by the cooling system and HV cable installation.
   2. Beni: third package being tested (#1), all the channels (~3k) working OK except one strip, but could be the electronics.
   3. The three installation carts have been surveyed (including one for CDC). To check for possible deformations, will load one card with 155kg (FDC+cables) using the FDC mock-up.
3. CDC Update
   1. The downstream plenum was installed on Friday, which was CDC tech Kate's last day. This completes the CDC construction.
   2. Amy and Gary have been checking the CDC for leaks, found nothing at the downstream plenum and some very small leaks on the inner ring of hookup wires where they are soldered onto the transition boards. The leaks are difficult to pinpoint so we propose to seal the ends of the wires with the same epoxy which was used for this previously; maybe the seals became cracked when the wires were positioned for soldering.
4. CDC HV Connectors and assembly
   1. The one engineering task remaining is to install the cooling ring for the electronics, which must also provide a mount for each of the 6 HV connector blocks. The blocks are on order and will be installed at JLab. Each mount will need to provide strain relief for one big HV cable, but not to support all of its weight, just to make sure that there are no tight bends where it approaches the CDC. Presumably the cables will be supported by some structure attached the magnet. The cooling ring is a polyflo pipe mounted on 12" long Al rods which fit into threaded holes in the endplate. Holes have been drilled in the pipe so that air can be blown over the electronics. Details of the mount will be discussed at the collaboration meeting. Clean air will be required for the cooling ring.
5. CDC Testing
   1. CMU needs to send JLab a request for a no-cost extension. The intention is to use the CDC for calibration/testing as much as possible before and after installation, to keep it at CMU for testing until shortly before its installation date, when it will be transported to JLab. At present the baseline schedule shows the FDC installation into the magnet happening in mid-October, so it would seem pragmatic to request the extension until late 2013.
      1. CMU's plan for testing the CDC includes taking data with cosmics first to verify that each straw can provide a signal and then to provide drift-time and amplitude measurements for each straw.
      2. Allowing one day of cosmics per measurement but reading 72 straws (1 fADC) at a time, 5 days per week, the measurements should take 10 weeks, excluding time for setup.
      3. Beni has sent cables to CMU for LV, HV and data, enough for 3 fADCs. With 3 fADCs one set of measurements should take only 4 weeks and so we should have time to make measurements at the midpoint and at both ends of the chamber.
      4. With 3 fADCs we should also be able to find tracks through at least half of the chamber.
      5. During this time we will also be working on the fADC readout, and developing calibration methods and software.
   2. Manpower will be needed at JLab during CDC installation but we should be able to do the data analysis remotely.
   3. We are hoping to be able to use BCAL for triggering during post-installation calibration runs with cosmics. There is a possibility that we might get some beam into Hall D in April 2014 when it should be in the tagger hall, we should plan for beam tests then or wait until October 2014. Until then the solenoid magnetic field will mostly be off, the solenoid will be cooled with N2 but not He.