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Possible LHCb upgrades with GEM based detectors

Possible LHCb upgrades with GEM based detectors. G.Bencivenni, A. Cardini Ca/LNF - GEM group. Innermost regions of muon apparatus: M2R1-R2 (+ M3R1?) M2R1(30x25 cm2); M2R2(60x25 cm2) R&D on LARGE SIZE (?)M3R1(33x27 cm2) Tracking devices for TT station (or...):

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Possible LHCb upgrades with GEM based detectors

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  1. Possible LHCb upgrades with GEM based detectors G.Bencivenni, A. Cardini Ca/LNF - GEM group • Innermost regions of muon apparatus: M2R1-R2 (+ M3R1?) • M2R1(30x25 cm2); M2R2(60x25 cm2)R&D on LARGE SIZE • (?)M3R1(33x27 cm2) • Tracking devices for TT station (or...): (forward tracking of low momentum particles and Level-1 trigger) • # 1 station composed by 4 layers of silicon microstrips with mono-dim. strips (200 micron pitch XUVX) with digital readout (60-70 µm resolution); • Global dimension of the station: 140x120 cm2R&D on LARGE SIZE • HIGH resolution chamber

  2. Muon Upgrade

  3. Muon upgrade Dead time inefficiency & linearity of FE electronics are degraded if rate at FE channel & 1 MHz ) The precise limit is to be investigated ! Max Rate with L = 2 × 1033 (Martellotti et al. LHCB note 2005-075) • The largest part of M1 seems to be out of game; • M2R1 and M2R2 (and probably M3R1) should be replaced • M2R2 would require for Large size GEM

  4. R&D on large GEM With present double-mask photo-lithographic technology the maximum size of GEM foils is limited to about 400x400 mm2. Such a technique allows to create the same hole images on both faces of the copper clad polyimide foil only if the two masks are perfectly aligned with a precision within 5-10 μm, resulting in the typical double-conical hole GEM geometry. In addition, the width of the standard base material (an adhesive-less copper clad Kapton roll, 453 mm wide) represents the second limitation for large size GEM. Very promising solutions to overcome these two limitations seem to be the replacement of the double-mask technology with a single-mask technique on one side and on the other side the splicing procedure of GEM foils over a narrow seam (<3mm wide). Final goal: realize “single” GEM foils >> 1000x400 mm2 Collaboration LNF(KLOE2) - CERN group (RD51)

  5. R&D on large GEM: (step1) single vs double mask Starting raw material: 50μm Kapton foil with 5μm Copper clad Photoresist deposition, Single Mask Hole is opened with metal and kapton etching on one side Bottom side metal etching. Top side metal is preserved with Cathodic Protection technique Back to kapton etching to get almost cylindrical shaped hole Further metal etching to form a small rim and eventually to reduce the copper thickness

  6. STD GEM 70 50 70 NEW GEM 70 60/65 R&D on large GEM: single vs double mask With an X-ray gun, we compared, in CURRENT MODE, the basic performance of the new single-mask GEM with the standard double-mask. CONICAL vs BI-CONICAL

  7. R&D on large GEM: single vs double mask Gas Gain G60-70 / Gstd = 0.67 G70-60 / Gstd = 0.80 Additional 10  20 V needed to operate at the same Gain as Standard GEM

  8. R&D on large GEM: the large prototype (step2) We are going to build a large area planar GEM (30x70 cm2 active area), with the aim to test the quality and homogeneity of the large GEM produced with the new single mask technique.

  9. R&D on large GEM: the construction tools With the usual 1 kg/cm, finite element simulation indicates a maximum gravitational/electrostatic sag of the order of 20 μm Gauge meters Load Cells Jaws A large stretching tool has been designed and built. The frame gluing will be performed by using the “vacuum bag” technique, tested in the construction of the CGEM

  10. Tracking Devices Upgrade

  11. Upgrade of tracking devices • For tracking devices, as TT station, beside the R&D on large size GEM (in common with muon upgrade – even though special study of detector geometry is strongly required) the most stringent requirements are: • material budget: < 2% X0 • high rate capabilty: >> MHz/cm2 • radiation hardness • high spatial resolution: down to 60-70 µm • Requirements 1,2,3 are fulfilled by standard triple-GEM detectors: • Recent studies for KLOE upgrade demonstrated that one detector layer can be built with a material budget of the order of 0.380 % X0 (including “light” support structure) • Triple-GEM can stand particle rates > 50 MHz/cm2 • The radiation hardness of GEMs has been extensively studied by our group for M1R1 (No damages for Q>2.2 C/cm2) • The 4th point could be achieved with suitable FEE (probably analog readout à la COMPASS), and with some detector optimization. A planar GEM with strips readout will be built and tested by the end of the 2010.

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