MICROMEGAS DHCAL 2011 - Intro

Several attractive features for a semi-DHCALlarge 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

1x1 m2 MICROMEGAS chamber design6 boards with embedded front-end & Bulk MicromegasPads of 1x1 cm2 and dead zone < 2% inside chamber

Several beam tests in the past 3 years @ CERN2008 : 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.

1 m2 ~ 6x48x32 cm2

MICROMEGAS DHCAL 2011 - TB request

Continuation of 2011 testsWith a few 1X1 m2 chambers with optimized electronics (MICROROC)

Standalone testDetailed efficiency scan

150 GeV/c muonsRate below 1 kHzRD51 telescope (H4)

3000 triggers per pad x 104 pads25 Hz effective acquisition rate→ 15 days

Combined testChamber behaviour in showers

Insert all available chambers (2-5)in tungsten and/or steel CALICE structuresTest area preferred by CALICE : H8

Sample showers at different depths of the calorimeters

2 weeks in July/August in H4To 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)