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Use of Beam Loss Monitor type detectors in CNGS muon station

Use of Beam Loss Monitor type detectors in CNGS muon station. Talk overview. 1. Muon monitoring at CNGS. 2. Beam Loss Monitor (BLM) as muon detector at CNGS. 3. Summary. Decay pipe. Hadron stop.  detectors. SEM foils. Proton beam. Target. Horn. He tube. Reflector. He tube.

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Use of Beam Loss Monitor type detectors in CNGS muon station

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  1. Use of Beam Loss Monitor type detectors in CNGS muon station Valeri Falaleev & Gianfranco Ferioli

  2. Talk overview 1. Muon monitoring at CNGS 2. Beam Loss Monitor (BLM) as muon detector at CNGS 3. Summary Valeri Falaleev & Gianfranco Ferioli

  3. Decay pipe Hadron stop  detectors SEM foils Proton beam Target Horn He tube Reflector He tube Fe C 2.7 43.4m 100m 5m 1092m 18m 5m 67m x105 2  Muon fluxes 1.5x104 – 4.5x107 p/cm2 • Burst duration 10.5 s • Time between 50 ms / 6 s • bursts x107 2  / 1013pot / cm2  / 1013pot / cm2 x-slice (m) Original proposal x-slice (m) A system based on a set of fixed and movable SSD’s (like at WANF).  Muon monitoring at CNGS Main beam parameters Valeri Falaleev & Gianfranco Ferioli

  4. Muon monitoring at CNGS (2) Valeri Falaleev & Gianfranco Ferioli

  5. Muon monitoring at CNGS (3) CNGS features and special requirements •No access to the muon chambers during the runs, minimal number of accesses during the shutdowns => detectors should be very reliable Valeri Falaleev & Gianfranco Ferioli

  6. Muon monitoring at CNGS (4) > 500 m Valeri Falaleev & Gianfranco Ferioli

  7. Muon monitoring at CNGS (5) CNGS features and special requirements • No access to the muon chambers during the runs, minimal number of accessesduring the shutdowns => detectors should be very reliable • The detectors and electronics are separated by the distance of more then 500 m. => detectors signal should be high Valeri Falaleev & Gianfranco Ferioli

  8. Muon monitoring at CNGS (6)  / 1013pot / cm2  / 1013pot / cm2 Aligned case Mis-aligned case Valeri Falaleev & Gianfranco Ferioli

  9. Muon monitoring at CNGS (7) CNGS features and special requirements • No access to the muon chambers during the runs, minimal number of accessesduring the shutdowns => detectors should be very reliable • The detectors and electronics are separated by the distance of more then 500 m. => detectors signal should be high • No significant changes in the  event rate at Gran Sasso even for important misalignment of beam elements or mis-steering of the beam. => detectors resolution can be moderate • Flux variation is smooth. No need for absolute flux measurement. => detectors can be big in transversal direction • Cost limitation. => detectors should be as cheep as possible Valeri Falaleev & Gianfranco Ferioli

  10. Construction 5 6 Filled with 99.9% N2 at about 1.1 bar Active volume is 1250 cm2 92  All isolation is done from ceramic Signal electrodes Bias voltage 800 – 1200 V BLM as muon detector (1) General parameters • sealed ionisation chamber. • widely used at CERN last 30 years. • there are about 300 BLMs around the SPS and about 3000 new BLMs will be fabricated for LHC Valeri Falaleev & Gianfranco Ferioli

  11. BLM as muon detector (2)  Valeri Falaleev & Gianfranco Ferioli

  12. BLM as muon detector (3) HV and electronics 1M + 1000V 2.2 F • collected charge is 10 times more then for SSD • 18 channels (twisted pairs) signal cable up to 1500m length • read-out is sincronized with 50 Hz • common HV powers supply for all chambers • well developed shielding scheme • a few % long term stability calibration with 127Cs (3 mCi) source Valeri Falaleev & Gianfranco Ferioli

  13. BLM as muon detector (3) Preliminary linearity test • 2.5 s slow extraction • flux from 102 to 105 p/cm2 • 50/50 mixture of 120 Gev protons and pions Target Proton beam Proportional Ionisation Chamber (PIC) Scintillator + PM BLM Collimator Valeri Falaleev & Gianfranco Ferioli

  14. • linearity at highest intensity (4.5x107 p/cm2 for nominal CNGS beam) - space charge limit at 4 x 107 p/cm2 (6mm gap, 1kV) BLM as muon detector (4) Week points of BLM - not optimized detector construction Possible solutions: better design of new LHC BLM, calibration with reference chamber • a bit much of material: difficulties for calibration and beam scan Possible solutions: better design of new LHC BLM Valeri Falaleev & Gianfranco Ferioli

  15. Summary The Beam Loss Monitor is a suitable device for CNGS muon monitoring station and can be used as both fix and movable detector. Further design work on new BLM and study of chamber characteristics are needed. Valeri Falaleev & Gianfranco Ferioli

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