May 9, 2012 Tracking CDC/FDC

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Meeting Time and Place

Wednesday May 9, 2012 at 11:00am At Jefferson Lab, the meeting will be held in F326

Connections

To connect from the outside, please use ESNET

  1. ) ESNET: 8542553
  2. )To connect by telephone, dial:
  • You can look up toll-free number at http://www.readytalk.com/intl
  • US and Canada: (866)740-1260 (toll free)
  • International: (303)248-0285 (toll call)
  • enter access code followed by the # sign: 3421244#

Hardware Agenda

  1. Announcements
  2. Collaboration Meeting
  3. FDC Update logbook
  4. CDC Update
    1. Magnetic Material Update
    2. Construction Update
    3. Cosmic Calibration of the Chamber
  5. TDR Update

Tracking Software Agenda

  1. Announcements.
  2. Summary of current work on tracking.

Hardware Minutes

Participants: Curtis, Naomi, Beni, Simon, Lubomir, Dave, Tim

  1. Announcements
  2. Collaboration Meeting
  3. FDC Update
    1. Third package has now four cells installed with new O-rings and vacuum grease. Oxygen is very low, 100ppm, all channels are working as tested with a source. There were problems applying HV on one of the cells, but finally we conditioned it and it's stable already 48 hours.
    2. The last two cells of the package were supposed to be installed today, but found a problem, one wire broken between the pad and the epoxy. Normally we cover this place with epoxy but in this case it was left exposed and broken probably during solder cleaning.
    3. First package grounding: Beni explained his grounding scheme that resulted in significant reduction of the threshold. At hundred places he used paper clips and aluminum foil to connect the grounds within a cell. We will implement this scheme in the third package using copper clips and foil. Somehow the foils work better than wires.
  4. CDC Update
    1. Magnetic Material Update: We visited a 3T MRI machine and held one board of 24 wires in the bore of the magnet, there was a light pull from the field but nothing dramatic. We have been trying to source some non-magnetic wires, it is not easy as often wires are specified as copper core but turn out to have copper coated stainless steel core. If we do find some acceptable wire then we will start wiring the central boards with the original wires which we already have made up, and use the non-magnetic wire for the outer boards.
    2. Construction Update: The swiss cheeseplate has been mounted onto the CDC with its holes covered, to keep solder fumes from going inside the straws, and the standoffs for the transition boards are in place. The rohacell has been glued onto the C fiber endplate and a sheet of plastic has been temporarily mounted on top of the rohacell. Filtered air will be sent into the CDC through the plastic sheet to maintain a slight overpressure inside it, again to prevent soldering fumes from entering.
    3. Beni offered to have the HVBs (now at JLab) sent up to CMU.
    4. Cosmic Calibration of the Chamber: We briefly discussed the survey results and concluded that the accessible parts of the endplate will be re-surveyed at JLab for clocking.
  5. TDR Update
    1. There has not been much TDR progress in the last few weeks so Curtis will remind everyone at the collaboration meeting.

Software Minutes

  1. Simon has improved the proton reconstruction efficiency at momentum from 300 MeV/c to 350 MeV/c. He has also fixed some divide-by-zero errors in the track finding code.