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Radiation tolerant fibres for LHC beam-instrumentation Project and Engineering Aspects

Radiation tolerant fibres for LHC beam-instrumentation Project and Engineering Aspects. L.K. De Jonge 1 , T. Wijnands 1 , J. Kuhnhenn 2 , S. K. Hoeffgen 2 , U. Weinand 2 1 CERN, TS Department 2 Fraunhofer INT Euskirchen Germany. 6 th LHC Radiation Workshop : 29-30 November 2007 CERN.

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Radiation tolerant fibres for LHC beam-instrumentation Project and Engineering Aspects

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  1. Radiation tolerant fibres for LHC beam-instrumentationProject and Engineering Aspects L.K. De Jonge1, T. Wijnands1, J. Kuhnhenn2, S. K. Hoeffgen2, U. Weinand2 1CERN, TS Department 2 Fraunhofer INT Euskirchen Germany 6th LHC Radiation Workshop : 29-30 November 2007 CERN

  2. Outline • Project overview and blowing technique • Dealing with radiation constraints • MC results IR3/IR7 • Installation of bypass ducts LHC P4-P3, P6-P7 and P8-P7 • Selection and development of radiation resistant fibres • Fujikura fibres the most tolerant • Draka Comteq micro cable production • Installation status IR3/IR7 • Fibre monitoring (JDSU/ATLAS system) • Concluding remarks Radiation tolerant fibres for LHC beam-instrumentation

  3. Radiation tolerant fibres for LHC beam-instrumentation

  4. Optical cabling with micro ducts • Blow 7mm micro ducts • Blow micro optical cables • Modular and flexible • Easy to replace cables high precision 25mm polyamide tube Radiation tolerant fibres for LHC beam-instrumentation

  5. Production of 25mm polyamide precision duct polyamide extruder production in cooled water under vacuum Radiation tolerant fibres for LHC beam-instrumentation

  6. Blowing of micro ducts and micro cables blowing of 7x7mm HDPE micro ducts blowing of a micro cable Radiation tolerant fibres for LHC beam-instrumentation

  7. Beam instrumentation lay-out Adjacent octant Right Adjacent octant Left 3 3 4 4 5 5 5 1 2 3 4 Radiation tolerant fibres for LHC beam-instrumentation

  8. Beam instrumentation at P3 right (max.3600m) Radiation tolerant fibres for LHC beam-instrumentation

  9. Cable blowing calculation UJ32right(2500m) Radiation tolerant fibres for LHC beam-instrumentation

  10. Blowing speed versus time Radiation tolerant fibres for LHC beam-instrumentation

  11. Blowing test at Draka Comteq factory 2650m Radiation tolerant fibres for LHC beam-instrumentation

  12. Radiation constraints • Early studies were only done for arcs (BI max. 6 dB attenuation) • TCC2 test (500 Gy/1999-2000) • Test at Saclay in 2004/Poseidon irradiator CO60 (3 kGy) to test bloweability and confirm attenuation behavior • MC results IR3/IR7 in 2005 (K.Tsoulou et all) Radiation tolerant fibres for LHC beam-instrumentation

  13. MC simulations collimation area IR7 104Gy/yr Dose rate distributions along the tunnel in Gy/year Radiation tolerant fibres for LHC beam-instrumentation

  14. Radiation constraints • Early studies were only done for arcs • TCC2 test (2500 Gy) • Test at Saclay in 2004/Poseidon irradiator CO60(3 kGy) to test bloweability and attenuation • MC results IR3/IR7 (rad. levels much higher then arcs) • Standard G652.D 9/125 fibre would not resist • Contract with Fraunhofer INT to select the most tolerant fibre • Screening test • Detailed test with parameter variation (dose rate, temperature, power) • Mixed field test (at CERN TCC2) • QA sample test • New test at Saclay to test only bloweability (300 kGy) Radiation tolerant fibres for LHC beam-instrumentation

  15. Ducts and fibre irradiation Poseidon/Saclay 3/300 kGy Radiation tolerant fibres for LHC beam-instrumentation

  16. Blowing test at the Draka factory (1000m) blowing out of cable test loop 2x1000m Radiation tolerant fibres for LHC beam-instrumentation

  17. Blowing test at the Draka factory (1000m) re-blowing of a cable test loop 2x1000m Radiation tolerant fibres for LHC beam-instrumentation

  18. Blowing speed not altered after 300 kGy Radiation tolerant fibres for LHC beam-instrumentation

  19. Microduct test after irradiation at 300 kGy Radiation tolerant fibres for LHC beam-instrumentation

  20. Backup solution with extra ducts IR 3 : Momentum Cleaning IR 7 : Betatron Cleaning Radiation tolerant fibres for LHC beam-instrumentation

  21. Beam instrumentation lay-out extra ducts P7left-right from P8 from P6 5 1 2 3 4 Radiation tolerant fibres for LHC beam-instrumentation

  22. Bypass ducts (5) blowing P4 to P3 2800m Radiation tolerant fibres for LHC beam-instrumentation

  23. Fraunhofer studyFibre and cable production • Draka and Fujikura developed the 2 most tolerant fibres • normal Draka G652.D 9/125 fibre already very good • Finally Fujikura developed the best radiation resistant fibre • first production of 500 km for 7BI-right • contract with Fujikura for 2000 km for 7BI-left and 3BI-right • production rate 300 km/month • to improve production lengths CERN accepted α≤0.5 dB/km • Draka Comteq produced the micro cables (8, 12 and 24 fibres) • total of ~250 km cable produced and delivered at CERN • 7BI has been finished just in time before cooling this sector • 3BI-right remains to be done just within LHC schedule Radiation tolerant fibres for LHC beam-instrumentation

  24. Beam instrumentation radiation monitoring Adjacent octant Right Adjacent octant Left 3 3 4 4 5 5 5 1 2 3 4 Radiation tolerant fibres for LHC beam-instrumentation

  25. Fibre monitoring system ATLAS/JDS-Uniphase to other cables under test OTAU OTDR Optical Switch λ1550 nm Optical Time Domain Reflecto meter RTU Remote Test Unit OTx ORx Cable under test up to 100 km long System Management Internet CERN intranet WEB Client Radiation tolerant fibres for LHC beam-instrumentation

  26. Concluding remarks • Confident that the radiation aspects have been properly addressed • BI problem solved (total attenuation will remain under 6 dB, BI constraint) • Bypass ducts available as backup solution • Communication fibres no problem either (larger power margins) • Project successful • The blowing technology has proven to be the right choice • Excellent and productive collaboration CERN, Fraunhofer and Industry • Fair and tough competition between Draka and Fujikura to develop the most tolerant single-mode optical fibre • Fibre and cable production by industrial process (repeatable) • Looking forward to finalize our studies (report) • Further studies • Fibre monitoring • Collaborations Radiation tolerant fibres for LHC beam-instrumentation

  27. And last but not least • Many thanks to • Fraunhofer INT/DE • Studies and measurements • Draka Comteq Telecom/NL • Optical fibre supply and installation contract • Mauerhofer&Zuber/CH • Optical fibre installer • Fujikura Ltd/GB and Japan • Radiation resistant optical fibre production • CERN and colleagues involved • And special thanks to Thijs Wijnands and Jochen Kuhnhenn Radiation tolerant fibres for LHC beam-instrumentation

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