1. H.-G. Moser Max-Planck-Institut für Physik 2nd DEPFET workshop 3-6 May 2009 Open Issues Readout cycle: 10 µs or 20 µs ? Advantages of 20 µs: - smaller pixel -> better resolution - smaller pixel -> fast charge collection, no additional drift rings (proven ILC design) - 100ns lines readout instead of 80ns Disadvantages: - higher occupancy - more readout bandwidth needed -> decision ? - more shared frames (multiple triggers) - more power (switcher, but only idle chips, number of active lines Constant or variable pitch? no improvement (surprise?) complicated design (drift rings) -> CP baseline? Bricked pixels? helps for 1600/2000 CP Trigger rate: 10 kHz or 30 kHz final or initial running? burst or steady? if this is an issue it may have an impact on 10/20 µs choice

2. H.-G. Moser Max-Planck-Institut für Physik 2nd DEPFET workshop 3-6 May 2009 Open Issues Irradiations: factor 2 lower: 4 Mrad instead of 8 Mrad check dosimetry (SDD, RADFET) repeat up to 10 Mrad DHP single or multiple chips? DHH definition of inputs and outputs Kapton connection DHP-DHH Where should it be located DCD tests Good news: works at 12.5 MHz (80 ns line rate) noise not yet satisfactory: 450 e with 50pF load (x 1.4 for CDS ?) -> better understanding -> need to increase gq? power (5-6 mW/ch) ? further development: new readout options? Module layout power/signal distribution regulators? 3rd metal line bump bonding options

3. H.-G. Moser Max-Planck-Institut für Physik 2nd DEPFET workshop 3-6 May 2009 Open Issues Physics studies (pixel optimisation), SVD digitization Fix tracking code (correct impact parameter mesurement) Test with single tracks (muons 200-500 MeV) Use real physics events Get realistic background simulation Power supplies (Testbeam) ready for testbeam? testing of matrices? Power supplies (Bellle II) space requirements and location of docks Voltage list and specs (can the number of voltages be reduced) Sensing, regulators Slow control grounding policy (ground loops half-module but monolithic sensor) Cooling Issues max. airflow? Vibrations? how to get the air in/out? protection of the SVD? ……you name it…

4. H.-G. Moser Max-Planck-Institut für Physik 2nd DEPFET workshop 3-6 May 2009 What is the chance of a smaller beam pipe? Most likely radius Impact on ladder dimensions Au layer: can this be reduced Machine Issues Will we have a larger crossing angle (60 mrad) ? Beam pipe tilt beyond 22mrad: nightmare! Will we have a smaller beam energy asymmetry ?

5. H.-G. Moser Max-Planck-Institut für Physik 2nd DEPFET workshop 3-6 May 2009 Organisational Matters Common Wiki for all the presentations in the WP meetings Experience with present HLL host? Meetings of WP partners should be announced at least 1 week ahead (email, Wiki) Meetings of WP partners should be documented Experience with EVO Meetings schedule needed (external partners calling in) Create a DEPFET EVO room? Conference Contributions