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Report on Beam Loss Monitors

Report on Beam Loss Monitors. Specification Type of detectors Location of detectors Status of developments, production and tests. Loss Levels and Required Accuracy. Functional specification: https://edms.cern.ch/file/328146/2.0/LHC-BLM-ES-0001-20-00.pdf. Reliability and Time Resolution.

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Report on Beam Loss Monitors

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  1. Report on Beam Loss Monitors Specification Type of detectors Location of detectors Status of developments, production and tests LEADE, Bernd Dehning

  2. Loss Levels and Required Accuracy Functional specification:https://edms.cern.ch/file/328146/2.0/LHC-BLM-ES-0001-20-00.pdf LEADE, Bernd Dehning

  3. Reliability and Time Resolution Definition (specs): By criticality, we mean that the system must be 100% operational to allow beam injection and that the beam is dumped if it fails. • In case of a non working monitor this monitor has to be repaired before the next injection LEADE, Bernd Dehning

  4. Bending magnet Quench level and observation range 450 GeV 7 TeV Damage levels Special & Collimator Arc Quench and Damage Levels Detection of shower particles outside the cryostat or near the collimators to determine the coil temperature increase due to particle losses Dynamic 108 LEADE, Bernd Dehning

  5. Loss Detectors Ionisation chamber few litre volume diameter = 8.9 cm, length 15 cm Secondary emission monitor diameter = 8.9 cm, length 60 cm, 1.5 litre LEADE, Bernd Dehning

  6. Location of Detectors (I) • Distinguish between beams • Observe losses due to magnet misalignments • Observe losses due to orbit changes and emittance growth Exact longitudinal position not defined yet Impact of protons in the centre of the quad. magnet LEADE, Bernd Dehning

  7. Location of Detectors (I) (One side of IP only, has to be multiplied by two to get the number per IP, if not indicated differently. Only one beam, if not indicated differently) LEADE, Bernd Dehning

  8. Status of BLM’s • Ionisation chamber and SEM: • final tests with proto • production contracts in preparation • Installation start in 09/2005 • Current to frequency converter: • Prototype tests in SPS ( - 11/2004) • Radiation tests at PSI (06/2004) BIC (Dump) Ionization Diode Multi- Current to Beam Permit Threshold Demulti- Chamber orSEM plexer frequency comparator Beam Energy plexer LASER converter VME Bus Below Quad. in ARC At surface (SR, SX) Analogue Electronics Digital Electronics • Transmission link (optical): • GOL/GOH from CMS • DIODE/TLK proto in 11/2004 • Threshold comparator • DAB TRIUMF BPM/BLM • Proto 08/2004 • Complete Proto system 12/2004 LEADE, Bernd Dehning

  9. Notation:(BLMS: Monitors in the Straight Sections, Triplett, D1, D2) LEADE, Bernd Dehning

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