1. Beamstrahlung Monitor

2. A 3GEM Beamstr. Monitor
10 cm
2.4 cm
2.4 cm
64 pads
10 cm
A triple GEM 10x10 cm2 has been built with a 64 pixel 3 x3 mm2
The read out has been realized using 8 chip ASDQ (8 channel each)
Actually non more than 64 channel readout is possible;

3. Pictures
Calorimeter
3GEM
lead

4. Analysis run 1381 (1-4-07)
several channels masked due to high noise level

5. Analysis run 1383 y x
# hits y x x y
time

6. Time profile
hits number in 10 msec

7. Run 1414 (5-4-07 19:35) Improvements on grounding 1 2 3 4 1 2
min

8. Luminometer

9. Luminometer detail

10. PCB with pads : two solutions
channel
200 mm
channel

11. frames

12. GEM foil

13. GEM foils

14. details of discharges
Discharges with chamber powered at 1370 with Ar CO2 CF4:

15. details of discharges
Discharges with chamber powered at 1340 with Ar CO2 CF4: