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A CGEM Prototype for BESIII Inner Drift Chamber Upgrade

A CGEM Prototype for BESIII Inner Drift Chamber Upgrade. Project Co-financed by the Italian Ministry for Foreign Affairs (MAE). R. Baldini Ferroli, (INFN-LNF) for a China-Italy Collaboration. Outline. BESIII requirements for a CGEM Inner Tracker Prototype targets LNF CGEM miniworkshop

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A CGEM Prototype for BESIII Inner Drift Chamber Upgrade

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  1. A CGEM Prototype for BESIII Inner Drift Chamber Upgrade Project Co-financed by the Italian Ministry for Foreign Affairs (MAE) R. Baldini Ferroli, (INFN-LNF) for a China-Italy Collaboration January 7th, 2013 - USTC, Hefei

  2. Outline • BESIII requirements for a CGEM Inner Tracker • Prototype targets • LNF CGEM miniworkshop • Assembling a KLOE2 CGEM • GASTONE32 analog readout • Possible improvements January 7th, 2013 - USTC, Hefei

  3. QUN OUYAN at the CGEM workshop January 7th, 2013 - USTC, Hefei

  4. GEM: principle of operation 4 The GEM (Gas Electron Multiplier) [F.Sauli, NIM A386 (1997) 531] is a thin (50 μm) metal coated by a kapton foil perforated by a high density of holes (70 μm diameter, pitch of 140 μm)  standard photo-lithographic technology. By applying 400-500 V between the two copper sides, an electric field as high as ~100 kV/cm is produced into the holes which act as multiplication channels for electrons produced in the gas by a ionizing particle. Gains up to 1000 can be easily reached with a single GEM foil. Higher gains (and/or safer working conditions) are usually obtained by cascading two or three GEM foils. A Triple-GEM detector is built by inserting three GEM foils between two planar electrodes, which act as the cathode and the anode. LHCb geom January 7th, 2013 - USTC, Hefei

  5. 5 GEM detector features • flexible geometry arbitrary shape: rectangular, cylindrical … • ultra-light structure very low material budget: <0.5% X0/chamber • gas multiplication separated from readout stage arbitrary readout pattern: pad, strips (XY, UV), mixed … • high rate capability: >50 MHz/cm2 • high safe gains: > 104 • high reliability: low discharge, Pd < 10-12 per incoming particle • rad hard: up to 2.2 C/cm2 integrated over the whole active area without permanent damages (corresponding to 10 years of operation at LHCb1) • high spatial resolution: down to 60µm (COMPASSwith analog readout Nucl.Phys.Proc.Suppl. 125 (2003) 368-373) • good time resolution: down to 3 ns (with CF4) January 7th, 2013 - USTC, Hefei

  6. KLOE at upgraded DAFNE f-factory (1020 MeV) 7m 6 m KS = 0.6 cmKL = 340 cm K = 95 cm • Lead/scintillating fiber • 98% coverage of solid angle • 88 modules (barrel + end-caps) • 4880 PMTs (two side read-out) • 4 m diameter × 3.3 m length • 90% helium, 10% isobutane • 12582/52140 sense/tot wires • All-stereo geometry Drift Chamber Electromagnetic Calorimeter sE/E = 5.4%/ st = 54 ps/ srf= 150 mm sz = 2 mm sV = 3 mm sp /p = 0.4 % • 100 ps(calib) B = 0.52 T 6 January 7th, 2013 - USTC, Hefei

  7. 7 Read-out Anode 2 mm GEM 3 2 mm GEM 2 2 mm GEM 1 3 mm Cathode Induction Transfer 2 Transfer 1 Conversion & Drift KLOE2 Inner Tracker To improve vertex reconstruction of Ks , η and η’ and Ks- KLinterference measurements: rφ 200 µm and z 350µm low material budget: < 2% X0 Cylindrical GEM detector is the adopted solution Cylindrical Triple GEM • 4 CGEM layers :from IP to DC Inner wall • 700 mm active length • XV strips-pads readout (~40o stereo angle) • <2%X0total radiation length in the active region KS → p+ p-vertex resolution will improve of about a factor 3 from present 6mm January 7th, 2013 - USTC, Hefei

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  9. BESIII CGEM expected spatial resolution Digital readout KLOE2 (650 µm pitch) sx =190 µm sz ~ 350 mm Magnetic field effect : charge spread over the readout plane 190 µm  330 µm Analog readout high spatial resolution: down to 50µm ( COMPASS ,400 µm pitch) Hopefully no magnetic Field effect, since analog readout measures the centroid of the induced charge  sx ~ 650/400 • 50 ~ 80 mm  sz ~ 80 • 350/190 ~ 150 mm BESIII B : sx = 330 mm January 7th, 2013 - USTC, Hefei

  10. Material Budget KLOE2 BESIII January 7th, 2013 - USTC, Hefei

  11. Z resolution Liangliang talk Guilin Coll. Meet. January 7th, 2013 - USTC, Hefei

  12. Momentum resolution Liangliang talk Guilin Coll. Meet. January 7th, 2013 - USTC, Hefei

  13. Prototype construction goals • Design,construction and test of a CGEM prototype, in case first layer of a new CGEM Inner Tracking • Design,construction and test of an analog readout system to achieve < 100 µm xy and < 200 µmz resolutions • Budget (euros) requested to Foreign Affairs Ministry, following the Agreement of scientific cooperation for a Joint laboratory “INFN-IHEP ” : 13 January 7th, 2013 - USTC, Hefei

  14. LNF CGEM miniworkshop • October 2012 : 2 days Cylindrical GEM workshop at LNF with Chinese collaborators,KLOE2 ,BARI,CMD3 and CERN (Rui de Oliveira) https://agenda.infn.it/conferenceDisplay.py?confId=5502 • G. Bencivenni (LNF) and collaborators presented the status of KLOE2 Inner Tracking CGEM detector • A. Ranieri (Bari University) presented the analog version of KLOE2 GASTONE digital readout • The second day was dedicated to visit the CGEM laboratory, where a practical assembly procedures demonstration was given • The following slides are a summary of D. Dominici and A. Ranieri talks on CGEM construction, assembling and analog readout January 7th, 2013 - USTC, Hefei

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  18. GEM Foils • GEM foils by CERN TE-MPE-EM with a single-mask chemical etching tuned to produce large size GEM • Present size 1.2m x 0.5m (active area) • Future max size 2m x 0.5m • The hole shape is double conical (70-50-70) • with a slight asymmetry 18 January 7th, 2013 - USTC, Hefei

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  28. Detector sealing January 7th, 2013 - USTC, Hefei

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  31. Detector assembled January 7th, 2013 - USTC, Hefei

  32. Cosmic rays test Test with final HV cables , distributors, FEE and DAQ system top/bottom scintillators for trigger tracking provided by external 10x10 cm2 Triple-GEM 32 January 7th, 2013 - USTC, Hefei

  33. KLOE-2 IT Construction Status 25-29 November 2012,BESIII Winter Collaboration Meeting,Guilin January 7th, 2013 - USTC, Hefei

  34. GASTONE32 with analog readout • GASTONE32, a 32 channels board with analog readout, already available. It produces an amplified and shaped output of the detector input. (See workshop A. Ranieri presentation ) • Funding request to INFN for a small planar (1010)cm2 3-GEM (Bari group board in next slide) January 7th, 2013 - USTC, Hefei

  35. 25-29 November 2012,BESIII Winter Collaboration Meeting,Guilin January 7th, 2013 - USTC, Hefei

  36. GASTONE32: some test results • Ar/CO2=70/30 • G ~104 • 10 primary clusters/3 mm • Clsize~2.3 el/primary Charge/mip~36 fC Charge/mip/strip~9 fC January 7th, 2013 - USTC, Hefei

  37. Preliminary estimate layer 1 prototype construction • Cost (kRMB) Toolings available Molds 100 GEM/Anode 250 Readout 450 • Time ~ 2 years • MAE Budget: ~ 120 keuro January 7th, 2013 - USTC, Hefei

  38. Further Possible Improvements • CERN facilities can manifacture foils up to 1µm thick Cu • CF shield can be replaced by kapton • Molds mechanical tolerances could be more permissive • Experts are investigating a new assembling procedure using only 1 mold per layer instead of 5 • A biCGEM January 7th, 2013 - USTC, Hefei

  39. A new proposal(Rui de Oliveira and G. Bencivenni) • Material budget down to ~ 1.3 % X0 • Opposite B distortion • Streching -> no molds , no glue January 7th, 2013 - USTC, Hefei

  40. Summary • CGEM could be a solution for a new Inner Tracker • A relevant gain is achieved in the longitudinal view • Transverse momentum resolution worsening (?) at low momenta only • A prototype with analog readout in two years, if: • more people join this project January 7th, 2013 - USTC, Hefei

  41. Thank you for谢谢your attention January 7th, 2013 - USTC, Hefei

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