2 Fraunhofer INT Euskirchen Germany Radiation tolerant fibres for LHC beam-instrumentation Project 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

Radiation tolerant fibres for LHC beam-instrumentation 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 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Radiation tolerant fibres for LHC beam-instrumentation 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

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 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Production of 25mm polyamide precision duct polyamide extruder production in cooled water under vacuum 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Blowing of micro ducts and micro cables blowing of 7x7mm HDPE micro ducts blowing of a micro cable 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Beam instrumentation lay-out Adjacent octant Right Adjacent octant Left 3 4 3 5 5 4 1 2 3 4 5 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Beam instrumentation at P3 right (max.3600m) 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Cable blowing calculation UJ32right (2500m) 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Blowing speed versus time 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Blowing test at Draka Comteq factory 2650m 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

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) 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

MC simulations collimation area IR7 104Gy/yr Dose rate distributions along the tunnel in Gy/year 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

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) 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Ducts and fibre irradiation Poseidon/Saclay 3/300 kGy 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Blowing test at the Draka factory (1000m) blowing out of cable test loop 2x1000m 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Blowing test at the Draka factory (1000m) re-blowing of a cable test loop 2x1000m 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Blowing speed not altered after 300 kGy 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Microduct test after irradiation at 300 kGy 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Backup solution with extra ducts IR 3 : Momentum Cleaning IR 7 : Betatron Cleaning 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Beam instrumentation lay-out extra ducts P7left-right from P6 from P8 1 2 3 4 5 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Bypass ducts (5) blowing P4 to P3 2800m 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Fraunhofer study Fibre 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 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Beam instrumentation radiation monitoring Adjacent octant Right Adjacent octant Left 3 4 3 5 5 4 1 2 3 4 5 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Fibre monitoring system ATLAS/JDS-Uniphase to other cables under test OTAU OTDR λ1550 nm Optical Switch Optical Time Domain Reflecto meter RTU Remote Test Unit OTx ORx Cable under test System Management up to 100 km long Internet CERN intranet WEB Client 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Radiation tolerant fibres for LHC beam-instrumentation 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 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation

Radiation tolerant fibres for LHC beam-instrumentation 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 29.11.2007 Radiation tolerant fibres for LHC beam-instrumentation