1. A PiggyBack Micromegas Ioannis Giomataris – CEA-Saclay
M. S. Dixit et al., NIMA 518 (2004) 521
M. Dixit et al.,NIMA581 (2007) 254
P. Colas et al., NIMA535(2004)506
ATLAS resistive planes
MAMA project
P. Colas et al., NIMA535(2004)506
I. Giomataris

2. Micromegas on a resistive thin ceramic substrate
Readout pixels or strips is an independent element
Signal propagates through capacitive coupling without loss
If t2<<t12/1
Ceramic provide large dynamic range of dielectric constants

3. Test chamber
I. Giomataris

4. I. Giomataris

5. Signal induced at the read-out anode Efficiency Better than 90%
Argon + 5% Isobutane
Fe source
Efficiency
Better than 90%
I. Giomataris

6. Argon + 5% Isobutane
Cd-109 source
I. Giomataris

7. In Neon mixture
I. Giomataris

8. Gain stability: decrease of the gain the first 100 minutes
I. Giomataris

9. I. Giomataris

10. Advantages Detector dissociated from read-out plane
It provides spark protection
Excellent outgassing – Seal detector
Read-out of CMOS pixel ASICs
Negligible dead space
I. Giomataris

11. PiggyBack and TimePix
Parer in preparation:A Piggyback resistive Micromegas
 D. Attie, P. Colas, I. Giomataris, A. Gongadze, R. De Oliveira, Th. Papaevangelou, A. Peyaud
I. Giomataris