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RadMon Radiation Monitoring System for the LHC Machine and experimental caverns

RadMon Radiation Monitoring System for the LHC Machine and experimental caverns. T. Wijnands, C. Pignard, D. McFarlane, E. Dimovasili, K. Cwalina CERN TS department – LHC experimental areas. Acknowledgements :.

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RadMon Radiation Monitoring System for the LHC Machine and experimental caverns

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  1. RadMon Radiation Monitoring Systemfor the LHC Machine and experimental caverns T. Wijnands, C. Pignard, D. McFarlane, E. Dimovasili, K. Cwalina CERN TS department – LHC experimental areas Acknowledgements : Radiation facilities : UCL Louvain-La-Neuve, PSI Villingen, TSL Uppsala, CIS-BIO (CEA Saclay), Ljubljana, PROSPERO (CEA-Valduc) Radiation community : PH/MIC, Radecs community, ESA, JPL Special thanks : P. Proudlock,J-J Cloye, A-L Perrot, B. Hallgren, F. Locci, J. Palluel, R. Tesarek (FNAL), TS/DEM 24 April 2006

  2. Particle spectra in LHC underground areas

  3. Parameterization of a complex radiation field h > 20 MeV Single Events h > 100 KeV Dose nuclear cascade Bulk damage SEU counter Surface Damage radiation damage semiconductors PIN Diodes Radfet Radiation Monitor

  4. RADMON – monitor parts & assembly

  5. RadMon Calibration in radiation facilities PROSPERO REACTOR CEA Val Duc - Dijon OPTIS 60 MeV protons PSI Villingen TSL 177 MeV Neutrons TSL Uppsala -Sweden PAGURE 60Co source CEA Saclay - Paris GANTRY 250 MeV protons PSI Villingen

  6. RADMON architecture – areas covered 309 monitors in total

  7. RadMon installation in 4L completed D. McFarlane, C. Pignard, K.Cwalina, T. Wijnands

  8. Experimental Areas covered • LHCb cavern – UX85 & US85 • CMS cavern - UX55 & USC55 • ATLAS cavern – UX15 • FP420 • ZDC Alice • ATLAS Roman Pots • LHCf • …

  9. CMS – RadMon layout

  10. LHCb cavern – UX85

  11. SPS primary target hall BA80

  12. SPS proton run 2004 – super cycles SPS Super cycles

  13. SPS proton run 2006 - startup Bending magnet M2 beam line

  14. N W E S CDF Collision hall at FNAL R. Tesarek (FNAL) Low beta quads probably a line source of radiation High failure rate of LVPS at proton side CDF antiprotons protons RADMON radiation monitor

  15. CDF collision hall R. Tesarek (FNAL)

  16. Radiation levels in CDF collision hall

  17. ES separator accident in the Tevatron • One of the electrostatic separators (ES) sparked • Quench in magnet • Vacuum was lost • Several weeks downtime for repair Tevatron ES system separates the proton and antiproton beams from each other to avoid parasitic collisions away from the interaction regions

  18. Radiation due to ES accident at FNAL • No measurable variation of dose • No measurable variation of 1 MeV eq. neutrons • h > 20 MeV ONLY in SW region of CDF detector : ONW INW ISW OSW Time 011 009 167 388 Nov 21 16:12:51 2005 011 009 168 392 Nov 21 16:13:06 2005 corresponding fluence : 4x106 cm-2 (h > 20 MeV)

  19. Point 8 Right – TI8 test on 22 July 2007 Injection line

  20. Data storage and real time displays

  21. ? ? ? LHC sector test From Brennan G., Chamonix 2006

  22. Summary & conclusions • RADMON system • Mobile radiation measurements under SC magnets, in caverns and in LSS • 1 Hz data logging with real time data display • Spatio-temporal resolution complementary to BLMs • Proposal for LHC startup (TI8 test, sector test, eng. run) • Establish adequate subset of BLMs/RadMons for each stage • Display and storage data subset for immediate analysis in CCC • Proposal for nominal LHC : Radiation measurements DB • Store subset radiation measurements after each beam loss • How are beam losses and radiation levels are related (spatio-temporal) • How is the LHC being operated • How is equipment performing under radiation • How accurate are the simulations • How efficient is the shielding

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