CALICE MAPS Meeting, RAL, 23/04/08
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Present: Jamie Crooks, Anne-Marie Magnan, Yoshi Mikami, Owen Miller,
 Marcel Stanitzki, Renato Turchetta, Mike Tyndel, Giulio Villani, Nigel
 Watson
Phone: Paul Dauncey

Minutes: Paul


Minutes of previous meeting: No changes. Nigel should put his SiD talk
 on our MAPS web pages. He got a question on the size of the sensors we
 might use; these could be 8x8cm^2 but are limited only by the wafer
 size in principle. He also pointed out during the talk that it would be
 possible to use MAPS for just the first few layers, although we are
 studying a whole ECAL.

 As requested, Anne-Marie had delivered three USB_DAQs to Nigel for
 Birmingham, so RAL now have three and Birmingham five. This is enough
 for all foreseen tests, although Nigel thinks we will need to have
 trims files before it is worth running cosmics.

 Mike has looked into ISIS and there is no beam except for that used by
 MICE so it will not be possible to use this for a future beam test.


Future proposal: There was a long discussion on what shape the future
 proposal should take. LCFI seem to have three areas in mind; physics
 studies, mechanics, and the latest ISIS sensor testing. For the latter,
 they may hire back Konstantin as a consultant. Left to themselves, each
 of these would be a PRD grant and so 500k total each. With three
 proposals for three years, this might be ~0.5M/year total.

 We have options to concentrate on calorimeter sensors and make a full
 depth stack (see Paul's slides), or spread into more generic sensors
 which might have applications in tracking (see Marcel's document).

 There might be interest from LCFI groups to join in although it would
 clearly depend on the exact structure of the proposal. Paul will talk
 to Tim Greenshaw and John Womersley to get more information on the
 political side.


Sensor 1.0 testing: Jamie showed some slides on his latest tests; see
 usual web page. There are two more sensors bonded which look reasonable
 and should be tested in more detail.

 Owen showed some results on pixel non-uniformities; see usual web page.
 He sees significant variation in the pedestal "top-hat" position and
 width. The position shifts would correspond to pedestal shifts.
 However, the width differences could be due to noise differences or
 gain differences; it is not possible to tell without a known signal.
 Owen will prepare a trim file for each sensor.

 The results shown by Owen imply a precision in the trim of ~2TU over
 a range of ~100TU is needed, which requires six bits, not four or five.
 Hence, it seems quite important to get two extra trim bits if at all
 possible.


Sensor 1.1 design: Jamie showed a list of the design changes he would 
 implement for the next sensor round; see slide on usual web page. He
 also included his estimated schedule for this. He will delegate the
 design work to include the extra two trim bits to a second RAL/TD 
 engineer, Rebecca Coath, who will work in parallel.

 The next sensor will be only shapers but will still have both capacitor
 variants, such that regions 2 and 3 become like the current regions 0
 and 1. The test pixels will also be converted to shapers.

 The date for the PDR for sensor 1.1 was set for 15.00 on Thu 1 May.
 Jamie will circulate the documentation for this by Mon 28 Apr.

 The date for the FDR was fixed to 10.00 on Fri 13 Jun. We will need an
 external reviewer and Renato will check if Mark Prydderch is available.


Conferences: Abstracts are required soon for TWEPP and IEEE. Marcel will
 coordinate the submission of these.


Next meeting: The next regular meeting will be Tue 20 May at 13.00 as
 usual. However, there will be the PDR on Thu 1 May at 15.00 by phone 
 before then.