1. Covering a Large Area ILC-TPC endplate
D. Attié, P. Colas, M. Riallot

2. The Large TPC Prototype
Field cage by DESY
PCMAG 1T Magnet from KEK
Cosmic trigger from Saclay
endplate Mechanics from Cornell
Beam trigger hodoscope by Nikhef
Goal: cosmic-ray test and beam test (e-, 5 GeV) of readout panels (Micromegas, GEMs and ‘Gridpix’)

3. Micromegas panels: in 2008-2009: 1 panel at a time, centre of the detector.
Various technologies for the resistive layer are being tested
Size 17cm x 21 cm
T2K electronics (1 module)

4. Exchanging a module without opening the chamber is possible.

6. 2 panels tested so far at DESY
Only 6mm gaps between active areas

8. GEM panels : pads 1.25 x 5.25 mm. Thick Double GEM (100 microns) + gating, equipped with PASA+ALTRO (from ALICE)
In preparation in Japan
(data taking in February)

9. Endplate panels Dimensions from ‘after-Cambridge’ Panel height 336 mm
Panel width : from 278 to 454
About 6800 pads per panel

13. Total weight 400kg per side (with Al)