The interaction of the Laboratori Nazionali di Frascati– INFN with
TE-MPE-EM Workshop
G. BencivenniLNF-INFN
Frascati - Italy
GEM for the LHCb experiment (past)
GEM for the Cylindrical-GEM (C-GEM) of KLOE-2 experiment (present)
GEM for the possible upgrade of the muon apparatus of LHCb (future)
GEM for the possible upgrade of the Inner Tracker of BESIII (future)
GEM for the first Muon Wall of LHCB
In collaboration with INFN-Cagliari we built 24 (+6 spares) triple-GEM detectors with pad
readout (2005-2006). While the R&D and then the interaction with Rui started in 2000).
The size of the GEM was 20x24 cm2 (active area).
The TE-MPE-EM Workshop built the 90 (+20spares) GEM foils with the double-mask technique.
The readout boards were realized by ELTOS (Italy).
The Cylindrical-GEM of KLOE-2 (2011-2012)
4 CGEM layers with radii from 13 to 21 cm from IP and before KLOE Drift Chamber inner wall
700 mm active length
XV strips-pads readout (25o÷30o stereo angle)
1.5% X0 total radiation length in the active region
3 mm
2 mm2 mm
2 mm
Cathode
GEM 1GEM 2
GEM 3
Anode
Read-out
Cylindrical Triple GEM
The TE-MPE-EM workshop produced, on the basis of our design, with single-mask technology the GEM foils (up to about 400x700 mm2 active area) and also the readout foils (on kapton substrate):
- GEM n. 48 large foils - Readout boards n. 16 large foils - Cathode/Drift n. 12 large foils
The first 3 layers of CGEM
The gluing of the 3 GEM foils
700 mm
up to
1200
mm
Detail of readourt board
LHCb muon upgrade with GEM (2014-2017)
For the upgrade of most irradiated parts of the muon system, regions R1-R2 of station M2 , GEM is proposed as a possible rad-hard technology (particle fluxes up to 1 MHz/cm2 at the upgraded luminosity of 2x10 33 s-1cm-2).
# chambers /
size(w/out spares)
Total GEM foil area
M2R1 M2R2
n. 48 ~30x25 cm2
n. 96 ~60x27 cm2
~54 m2
R1-R2 of M2
Cylindrical GEM for BES III - Beijing-China (2013-2015)
?1620
?318
?431.5
?562
?497
724
2174
1952
1782
1612
1442
12721092
910870
2582
?349
?118
?126
10461070
?359
-1
-1
?730
?690.5
?626.5
?367.8
G
24-M8(沿8圆周 等分)
F
B
H
P-P 1 1剖旋转( : )
R
K
?1620
?318
?431.5
?562
?497
724
2174
1952
1782
1612
1442
12721092
910870
2582
?349
?118
?126
10461070
?359 -1
-1
?730
?690.5
?626.5
?367.8
G
24-M8(沿8圆周 等分)
F
B
H
P-P 1 1剖旋转( : )
R
K
Dimensions of the Inner Tracker :
Rmin = 63 mm; Lmin=780mmRmax=162 mm; Lmax=870mm
Number of CGEM layers = 4 w/stereo XV readout configuration
Drift chamber
Existing Inner Tracker (wire-chamber) to be replaced with 4 layers of Cylindrical GEM
Request for the TE-MPE-EM Workshop by BESIII:
GEM n. 16 GEM foils of ~ 800-900 mm active length, 300-400 mm wide
Cathode n. 8 foils ~ 800-900 mm active length, 300-400 mm wide
Readout boards n. 8 XV readout pattern (à la KLOE or Compass) ~ 800-900 mm active length, 300-400 mm wide
Conclusions
After about 12 years of interaction/collaboration with the TE-MPE-EM Workshop, for sure we can says that it was a very positive and fruitful experience.
But with the increase of requests from users and the busy schedules both in production and in the R&D of new structures, sometimes the biggest problem was the (not negligible) delay in the delivery of the requested materials.
In addition, I personally think that Rui should be helped by a person, who should keep contacts (interface) with the various manufacturers of detectors.