1. MICROMEGAS DHCAL 2011 - Intro
Several attractive features for a semi-DHCAL large area, high efficiency, low fired pad multiplicity, standard gas mixtures, proportional mode (semi-digital info.), resolution of 5-10 ns (CLIC), high rate capability (forward CAL), gain real time correction for P/T variations
1 m2 ~ 6x48x32 cm2
1x1 m2 MICROMEGAS chamber design
6 boards with embedded front-end & Bulk Micromegas
Pads of 1x1 cm2 and dead zone < 2% inside chamber
Several beam tests in the past 3 CERN
2008 : prototype of 16x6 cm2 with analog electronics (SPS and PS)
2009 : prototype of 32x8 cm2 and 48x32 cm2 with digital electronics (PS)
2010 : first Micromegas prototype of 1x1 m2 (SPS)
Publications/proceedings : JINST 4 P11023, JINST 4 P11011, JINST 5 P01013, IWLC 2010 proc., CALOR 2010 proc.

2. MICROMEGAS DHCAL 2011 - TB request
Continuation of 2011 tests
With a few 1X1 m2 chambers with optimized electronics (MICROROC)
Standalone test
Detailed efficiency scan
150 GeV/c muons
Rate below 1 kHz
RD51 telescope (H4)
3000 triggers per pad x 104 pads
25 Hz effective acquisition rate
→ 15 days
Combined test
Chamber behaviour in showers
Insert all available chambers (2-5)
in tungsten and/or steel CALICE structures
Test area preferred by CALICE : H8
Sample showers at different depths of the calorimeters
2 weeks in July/August in H4
To be combined with 2 weeks of RD51 request, so at the end : 1 month in summer
2 weeks in Oct./Nov. in H8
PS : special hazard : use of flamable gas (argon/isobutane 95/5), small volume (3l/chamber) and flow (3l/h)