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Minutes of Meeting: May 28, 2009 \\
Attendees = Bickley, Mittig, Pollacco, Roussel-Chomaz, Sakurai \\
\\
I. ASIC \\ 
- LP and WM will perform a final physics review of the specifications in the next ~week \\
- design implies electron amplification provided by either GEMs or uMegas \\
- at high rates the signal from wires will undershoot baseline \\
- need to examine whether pole zero compensation will be sufficient to correct particularly in pileup situations  \\
- must confirm with ED that the chip design will accommodate the inclusion of resistive sheets in the future \\
- Bordeaux will build an optional preamplifier that will sit between the pad and the filter \\
- must confirm that a switch is still included between the preamp and filter that allows  the system to be run in current mode \\
    pad-------->preamp-------->filter-------->SCA----------> 
               |         |___________/ ________| 
               |                               | 
               |_______________/  _____________| 
 
- confirm if 500us tail is corrected \\
- if the preamp is used w/o the filter saturation may occur \\
- tests should be conducted with AFTER to determine if this is a problem \\
- ED has a solution for this problem but there is not sufficient time to implement it before the first submission \\
- LP and WM will determine if track perpendicular to the pad will saturate the preamp \\
- should test AFTER with a wireplane to determine issues important to the Riken chamber \\
- all final decisions and tests must be completed by Dec to be included in the second submission \\
- must examine if saturated pads impact neighbors \\
- the filter shaping time is dependent on the angle of the track because the preamp integrates all incoming current \\
- this could be a problem if the preamps saturate \\
- need to confirm that the shaping time is correct (100ns->1us, 121fC & 10pC) \\
- if the shaping time is consistent with the width of the input signal then the resolution becomes poorer for longer shaping times \\
- the max size of the pad will not be dependent on the max shaping time bc the option exists to integrate \\
- WM will estimate errors for this type of situation \\
- could expand the max shaping time to 2us  \\
- need to determine if there are problems for slow drift gases such as H2 \\
 \\
II. ASAD \\
- board will likely be thicker than that of T2K bc it will be necessary to reduce noise \\
- ASAD design has been modified to include an FPGA to handle slow-slow controls \\
- will not interfere with analog bc changes are only made when data is not being written \\
- power must be supplied independently to the ASAD (not through the CoBo) need estimate of magnitude required \\
- FD has information regarding T2K cooling scheme \\
- Triumf worked on the T2K gas filtering and recirculation system \\
- ASAD will be designed to send the signal 5m, but will be operated with a 3m max cable length \\
- this will require repeaters be included on the board which require a large amount of power \\
- power supplies can have extended cable lengths \\
- LP is considering the requirements for a portable daq system that can be plugged directly into ASAD \\
- perhaps this is something Riken would be interested in? \\
 \\