Present: Cooper, Grillo, Jaros, Kenney, Maruyama, Nelson, Odian, Partridge

Please send comments/corrections to the whole gang.

1. Update from Alex
Alex reviewed the note he sent to this group recently. One hybrid is available for bonding to a D0 microstrip detector, but no readout is readily available. The impact of the intermediate strips on the D0 sensor isn't immediately clear for efficiency and resolution with the ABCD chip. 10MRad doesn't seem worrisome given that it's from electrons. In particular, surface charge is not a problem.

2. CMS Readout and Rad Damage
Tim's talk is here: http://www.slac.stanford.edu/~tknelson/talks/loco_vulpine.pdf
Upshot of his presentation is that we should think through the selection of readout choice, Atlas ABCD vs CMS APV25. Criteria for choice: cost, efficiency and headroom with radiation, use with thinned sensors?, resolution, implications for DAQ. We'll try to understand these differences and come to some rational decision.

Tim also discussed rad limits, which are much more lax with electrons than neutrons, and cooling and layout--see below.

3. Layout and Mechanics
Bill discussed slides distributed earlier, showing how the D0 sensors could be arranged. We must decide if we want minimum material, or overlaps for full efficiency (guess efficiency). Both sensor and hybrid must be cooled. Sensor can be cooled from the short edge, so no extra material in the fiducial volumen. Readout is probably best done with a short kapton connection between sensor and hybrid. It isolates a heat source from the sensors, and keeps hybrid mass out of the fiducial region.  It can be at right angles for horizontal sensors that butt against the pole tips. Sensors can be supported by carbon fiber onr Rohrcell, and remain very low mass. Takashi pointed out that we want a vertical no-man's land between left and right sensors. It will be advantageous to make the two halves horizontally movable to allow for adjustments to unknown beam sizes.

4. Homework
A) simulate D0 strip with ABCD chip to understand resolution and efficiency. Matt and Rich and Tim.
B) estimate cost for ABCD and APV25 readout legs. For ABCD this means cost of kapton, hybrid and (binary) DAQ; for APV25, cost of kapton, hybrid, digitizer, and (digital) DAQ. Alex and Tim.
C) we need an optimized tracker and magnet layout for further detailed discussion. Takashi and John.
D) DAQ options and costs for ABCD and APV25. Gunter.
E) Picture of mechanical concept. Bill
F) Vacuum or He? Matt and Rich.