Difference between revisions of "April 11, 2012 Tracking CDC/FDC"

Revision as of 16:30, 11 April 2012

Meeting Time and Place

Wednesday April 11, 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. FDC Update oxygen studies, logbook
3. CDC Update
   1. Construction Update File:Wiremap.pdf
   2. Cosmic Calibration of the Chamber
   3. Prototype CDC_prototype_more_on_timing_3
4. TDR Update

Tracking Software Agenda

1. Announcements.
2. Summary of current work on tracking.
3. Where we need to focus work (Discussion)?

Hardware Minutes

Participants: Curtis, Naomi, Beni, John, Simon, Lubomir, Mark, Tim

1. FDC Update
2. CDC Update
   1. Construction
      1. The cheeseplate has been polished and is now transparent. It will be installed on the CDC when the holes have been cleaned again. The standoffs are in place waiting for it. The thermocouple gear has arrived, Gary is planning to cover each thermocouple in heatshrink from approx 1/2 inch from the junction to after it exits the plenum. This is to avoid gas travelling inside the kapton. Both ends of the heatshrink will be sealed with glue. Also the holes which the thermocouples pass through will seal better with glue&heatshrink than glue&kapton.
      2. Naomi and Gary have been working on wire maps. One such map is linked to the agenda. This uses 3-5 layers of straws per board. Another plan with only 3 layers per board (where possible) needs 40 more 5-inch wires but neither plan needs any wires longer than 5". (The boards are numbered ring A-I with A central, and 1 to 26 clockwise within each ring, starting at 9 o'clock.)
      3. Tim has some results from the CDC survey to discuss, will send documents.
   2. Prototype
      1. Naomi has more fadc timing study results (see link in agenda) taking signal drift time as the point where the pedestal meets a straight line through pedestal mean + sigma and pedestal mean + 4sigma. She also tried fitting the drift time histogram with a combination of exponentials to obtain tzero (as in Avolio ATLAS paper), this is not as easy as it might seem but produces results only a few ns different from those obtained by fitting the leading edge with a straight line and then adding additional time to optimise the resolution. A good starting point can be obtained by eye as 2/3 of the way up the leading edge of the histogram. There is a series of small bumps in the drift time histogram, possible causes were discussed.