F.MurtasF.Murtas 11LUMI GEMLUMI GEM

Beamstrahlung MonitorBeamstrahlung Monitor

F.MurtasF.Murtas 22LUMI GEMLUMI GEM

A 3GEM Beamstr. MonitorA 3GEM Beamstr. Monitor

A triple GEM 10x10 cm2 has been built with a 64 pixel 3 x3 mm2

10 cm

10 cm2.4 cm

2.4 cm

64 pads

The read out has been realized using 8 chip ASDQ (8 channel each)

Actually non more than 64 channel readout is possible;

F.MurtasF.Murtas 33LUMI GEMLUMI GEM

PicturesPictures

lead

3GEM

Calorimeter

F.MurtasF.Murtas 44LUMI GEMLUMI GEM

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

F.MurtasF.Murtas 55LUMI GEMLUMI GEM

Analysis run 1383Analysis run 1383

time

# hi

ts

x

y y

x

y

x

F.MurtasF.Murtas 66LUMI GEMLUMI GEM

Time profileTime profile

hits

num

ber i

n 10

se

c

F.MurtasF.Murtas 77LUMI GEMLUMI GEM

Run 1414 (5-4-07 19:35)Run 1414 (5-4-07 19:35)

0 5 10 15 20 min

Improvements on grounding1 2 3 4

1 2

3 4

F.MurtasF.Murtas 88LUMI GEMLUMI GEM

LuminometerLuminometer

F.MurtasF.Murtas 99LUMI GEMLUMI GEM

Luminometer detail Luminometer detail

F.MurtasF.Murtas 1010LUMI GEMLUMI GEM

PCB with pads : two solutionsPCB with pads : two solutions

64 + 64 channel

32 + 32 channel

200 mm

F.MurtasF.Murtas 1111LUMI GEMLUMI GEM

frames frames

F.MurtasF.Murtas 1212LUMI GEMLUMI GEM

GEM foilGEM foil

F.MurtasF.Murtas 1313LUMI GEMLUMI GEM

GEM foilsGEM foils

F.MurtasF.Murtas 1414LUMI GEMLUMI GEM

details of dischargesdetails of discharges

Discharges with chamber powered at 1370 with Ar CO2 CF4: 55 40 5

F.MurtasF.Murtas 1515LUMI GEMLUMI GEM

details of dischargesdetails of discharges

Discharges with chamber powered at 1340 with Ar CO2 CF4: 55 40 5