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.