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Status of the Muon System Introduction and Overview

Status of the Muon System Introduction and Overview. Cagliari, CBPF, CERN, Ferrara, Firenze, LNF, PNPI, Roma 1, Roma 2. Scheme of the review. This talk will Remind you about the Muon Detector Describe the Organization and Responsibilities

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Status of the Muon System Introduction and Overview

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  1. Status of the Muon System Introduction and Overview Cagliari, CBPF, CERN, Ferrara, Firenze, LNF, PNPI, Roma 1, Roma 2

  2. Scheme of the review • This talk will • Remind you about the Muon Detector • Describe the Organization and Responsibilities • Update the overall status of detector production • Following talks • A. Lai will cover the Electronics • B. Schmidt will cover the integration and installation

  3. Internal Organization • Project Leader: G. Carboni (Roma2) • Key responsibles • Integration: B. Schmidt (CERN) • MWPC: P.L. Campana (LNF) • Electronics: A. Lai (CA) • Software: A. Satta (Roma2) • ECS: V. Bocci (Roma1) • Contact in Commissioning Task Force: C. Forti (LNF)

  4. Muon Detector I • Purpose • L0 triggering • Muon ID M2 M3 M4 M5 M1 • Space points measurement • Readout: • wire “pads” • cathode pads • mixed (wires+pads) • x and y projectivity to Interaction Point • 435 m2 • 20 l absorber (total, including CALO) Trigger: AND of 5 stations • All chambers 4 sensitive layers • Exception: M1 (2 layers)

  5. Muon Detector II • 20 different chamber geometries • 4 Regions, with granularity/resolution • variable with distance • from beam axis • highest in stations M2,M3 • (seeding stations) • lowest in M4,M5 • intermediate in M1 • 1368 MWPC • 960 Anode r/o (Region 4) • 336 Pad r/o (Region 1-3) • 72 mixed r/o (Region 1-2) • 24 3-GEMs M1R1 Chamber size M1R1 equipped with 3-GEMs (aging, cl. size) • Total number of physical FE channels: ~125 k • Total number of logical channels: ~ 26 k to trigger/DAQ

  6. M1 peculiarities • Lighter than rest (in front of ECAL and PS) • Structure: NOMEX honeycomb panels (.33  .15 X0) • Two sensitive layers instead of 4 • M1 is exposed to large particle fluxes (up to 500 kHz/cm2) • Aging characteristics are particularly important • Choice adopted in April `04 • 3-GEM in M1R1 (12+12) Cagliari/LNF • MWPC in M1R2 (24) CERN • GEM • EDR February 2005 • TDR April 2005 • Detector completion expected for October ‘06

  7. Activities in 2005 • All sites at nominal production rates or better • 910 chambers built and tested • More than 400 chambers already at CERN • GEM TDR approved and construction started • M1 (honeycomb panels) production started

  8. Chamber quality • Every single GAP is first tested in production phase (leaks, HV, gain uniformity) Uniformity test on 110 chambers  using source Acceptance band Firenze • Then the chamber is re-tested at CERN before installation (leaks, HV, electronics) • All chamber types are being tested at GIF for aging • Search for residual dark currents (“Malter effect”) • Results so far generally positive

  9. MUON SYSTEM – DETECTOR OVERVIEW Started 93% 68% 36% Completed 50% Completed Completed Completed Completed Completed Completed Completed 3-GEM Started Started Completed Completed Completed CERN LNF/FE/FI CA/LNF PNPI Qty.712 24 600 134 Total: 1368 MWPC + 24 3-GEM + Spares

  10. M1 production has started in LNF A few initial problems with panel gluing have been fixed First experience indicates that these chambers can be produced at a faster rate than M2-M5 (probably 5 ch/week)

  11. Gas leak < 1 mbar/day equiv. < 40 ppm H2O @ 80 cc/min gas flow Chamber overpressure (mbar) M1R1: Triple-GEM detector The HV divider prototype A completely equipped chamber (2 already built) CARDIAC-GEM boards pad by pad X-ray tomography uniformity better than 10%

  12. Chamber dressing

  13. Dressing tables: 5 (3 @ LNF, 2 @ CERN) • Capacity: 5 ch/day/table Faraday Cage (soldered to panel) LV Regulators FE Boards (min 3, max 14) HV Connector

  14. HV system UF/PNPI: (1X4) in M2,3,4,5/ R4 , (1X1) in M2,3,4,5/R3 CAEN: (1x1) in all other regions (1104 HV channels) Phase 1 ( 2600 channels) 1:1 in Phase 2 (2300 more channels) • Critical regions (R1-R3 + M1) have separate HV on each single gap • Choice of radiation-hard systems (50 Gy) to minimize number of long-distance cables • We have a backup solution if radiation hardness tests should indicate • serious problems

  15. Muon Software Largely rewritten for DC06 • Final description of passive and active materials • Iron walls structure, MWPC and GEM frames etc. • Final chamber positions and nominal tilt • Improved detector response parameters based on test beam and cosmic ray test results Many people involved

  16. Activities for 2006 • End of M2-M3-M5 production: early summer • End of M4: October • Produce at least 50% of M1 MWPC • Produce all 3-GEM M1R1 chambers • Produce some more spares • See other talks for electronics and installation

  17. Present schedule of MWPC production M2-M5 at CERN M1 On 30.01.06 : 910 chambers built and tested OK (at least gas or HV) All sites working at expected rate

  18. Conclusion • The 2005 experience has shown that the planned schedule was realistic • We are doing our best to keep it in 2006 • We should be able to install all M2-M5 and a sizable fraction of M1 for physics in 2007

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