1. P. Colas, Endplates 1 LP phone meeting, May 9, 2006 Large Prototype Endplate(s)

2. LP phone meeting, May 9, 2006P. Colas, Endplates2 Si-TPC Single-chip test detector First step, not to flush 100 liters: 6 cm x 2cm x 2cm field cage First step, not to flush 100 liters: 6 cm x 2cm x 2cm field cage fine gas tubes, USB readout fine gas tubes, USB readout To be tested in DESY test beam To be tested in DESY test beam possibly X-ray polarimetry in the Soleil synchrotron possibly X-ray polarimetry in the Soleil synchrotron In June : first prototype with Medipix 2 –MXR chip In June : first prototype with Medipix 2 –MXR chip In September real TPC with TimePix? In September real TPC with TimePix?

3. LP phone meeting, May 9, 2006P. Colas, Endplates3 LP endplate (s) Initial plans Initial plans differ a lot (Saclay T2K: 2 large modules, 12 bolts / Cornell: 26 small modules, 80 bolts Initial plans differ a lot (Saclay T2K: 2 large modules, 12 bolts / Cornell: 26 small modules, 80 bolts But will converge fast, somewhere between these extremes But will converge fast, somewhere between these extremes Saclay T2KCornell

4. LP phone meeting, May 9, 2006P. Colas, Endplates4 LP endplate (s) General principles (for discussion) General idea: several modules (more than 2) General idea: several modules (more than 2) Gas-tightness. From the back of each module: minimize dead areas Gas-tightness. From the back of each module: minimize dead areas Potential continuity Potential continuity Modules can be different, some can be dummy Modules can be different, some can be dummy Cannot mix GEM and Micromegas on the same endplate (different running conditions, very different potentials and thickness) Cannot mix GEM and Micromegas on the same endplate (different running conditions, very different potentials and thickness) However keep as similar as possible However keep as similar as possible Keep space for pixels Keep space for pixels

5. LP phone meeting, May 9, 2006P. Colas, Endplates5Convergence Si chip readout

6. LP phone meeting, May 9, 2006P. Colas, Endplates6 Japanese contribution to the LP They got >1 postdoc during 5 years + 50-100 k$/year They got >1 postdoc during 5 years + 50-100 k$/year Can contribute by industry building endplates/pad boards. Can contribute by industry building endplates/pad boards. Propose Endplate design meeting in Paris in September. Propose Endplate design meeting in Paris in September. –To clearly define goals of LP –To clearly define boundary conditions (field cage and electronic interfaces) –To agree on basic principles –To assess resources

7. LP phone meeting, May 9, 2006P. Colas, Endplates7 LEGS TPC (Brookhaven) : anode pads and ASIC plane Bo Yu, TPC application meeting, Berkeley, April 2006