The interaction of the Laboratori Nazionali di Frascati– INFN with TE-MPE-EM Workshop G. Bencivenni LNF-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 ( ). While the R&D and then the interaction with Rui started in 2000). The size of the GEM was 20x24 cm 2 (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 ( )  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 (25 o ÷30 o stereo angle)  1.5% X 0 total radiation length in the active region 3 mm 2 mm Cathode GEM 1 GEM 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 mm 2 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 ( ) 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/cm 2 at the upgraded luminosity of 2x10 33 s -1 cm -2 ). # chambers / size (w/out spares) Total GEM foil area M2R1 M2R2 n. 48  ~ 30x25 cm 2 n. 96  ~ 60x27 cm 2 ~54 m 2 R1-R2 of M2

Cylindrical GEM for BES III - Beijing-China ( ) Dimensions of the Inner Tracker : Rmin = 63 mm; Lmin=780mm Rmax=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 ~ mm active length, mm wide Cathode  n. 8 foils ~ mm active length, mm wide Readout boards  n. 8 XV readout pattern (à la KLOE or Compass) ~ mm active length, 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.