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SLHC Radiation Test Results

SLHC Radiation Test Results. Preliminary measurements Versatile Link project from exposure to gamma rays at SCK-CEN B. Todd Huffman (speaker), J. Hanzlik, C. Issever, T. Weidberg. The Outline. Brief explanation of facility used SCK-CEN sources Test procedures then and now.

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SLHC Radiation Test Results

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  1. SLHC Radiation Test Results Preliminary measurements Versatile Link project from exposure to gamma rays at SCK-CEN B. Todd Huffman (speaker), J. Hanzlik, C. Issever, T. Weidberg B. Todd Huffman

  2. The Outline • Brief explanation of facility used • SCK-CEN sources • Test procedures then and now. • Some Previous results and motivation for temperature controlled tests • Tests of Mulit-mode fibres • Draka RHP-1 SRH • InfinicorSX+ • Conclusions B. Todd Huffman

  3. RITA 0.6kGy/hr BRIGITTE 20kGy/hr The two locations: 60Co g rays B. Todd Huffman

  4. Previous High-dose test result Draka Commercial Draka 3 Infinicor Draka RHP-1 SRH B. Todd Huffman

  5. These Results are Good • Good Candidate MM fibres identified • InfinicorSX+ and Draka RHP-1 • Draka Fibre is under further development and will require future tests • But Limitations of Previous tests have prompted further studies. • Temperature dependence in particular B. Todd Huffman

  6. RIA and temperature, 1st 6 hours. B. Todd Huffman 7

  7. Previous research on RIA in fibre Single-mode Multi-mode 850 nm GRIN fibre at room temp (curve C) and -17 C (curves A & B) credit: Thériault Radiation effects on COTS laser-optimized graded-index multimode fibers exposed to intense gamma radiation fields Single-mode RIA as fcn of temp. credit: Kanamori et al. Transmission Characteristics and Reliability of Pure Silica-Core Single-Mode Fibers RIA is temperature-dependent! B. Todd Huffman 8

  8. Cold Container designed • Uses Peltier cooling elements • 4 coolers – 15V and 7A operation • Direct connection to Draka fibre • DT = ~60 deg C • Able to remove ~40W heat load • Suitable only for low dose facility • Radiation Damage and heat load • Heat shed to the shielding water • Water ambient temp = 30 deg C. • Goal  Maintain -250C B. Todd Huffman

  9. Container to Actively Cool Fibres B. Todd Huffman

  10. InfinicorSX+ Temperature Effects B. Todd Huffman

  11. Draka Fibre Temperature Effects B. Todd Huffman

  12. An interesting Temp. Radiation effect • Prior to radiation, fibre attenuation relatively insensitive to temperature variations. • RIA sensitizes fibres to temperature. • Particularly Dramatic with Infinicor fibres • Present, but less of an effect with Draka fibres • Keep in mind 50m of fibre are used. B. Todd Huffman

  13. Before 0.01 dB 0.05 Deg. C B. Todd Huffman

  14. after 0.7 dB 0.05 Deg. C B. Todd Huffman

  15. 0.05 dB Before 1 Deg. C B. Todd Huffman

  16. after 0.2 dB 1 Deg. C B. Todd Huffman

  17. Gamma sourceat room temperature.Variation is from prev.Stability limitations. Comparisons, InfinicorSX+ T = +300 C Dose = 65 kGy(Si) T = -23.30 C Dose = 30 kGy(Si) B. Todd Huffman

  18. Comparisons, InfinicorSX+ T = +300 C Dose = 65 kGy(Si) Gamma sourceat room temperature.Variation is from prev.Stability limitations. T = -23.30 C Dose = 30 kGy(Si) B. Todd Huffman

  19. Draka RHP-1 SRH fibre T = -40 C Total Dose ~ 15 kGy(Si) T = -250 C B. Todd Huffman

  20. Attenuation Upper limits • Low doses  extrapolate linearly up to SLHC tracker doses 375kGy. • CAUTION!!: upper limit • Lower dose rate in Tracker volume • RIA follows logarithmic scale at high dose • At -250C inside Tracker volume • InfinicorSX+  1.1 dB • Warm result  0.24 dB • Draka RHP-1  0.6 dB B. Todd Huffman

  21. Conclusions • Infinicor Fibre is Ge doped • Draka Fibre is F doped • No Ge used • Neither uses Phosphorous in their manufacturing process • F doped fibre (Draka) has better radiation performance even at cold temperatures • ~0.05 dB/m vs. ~0.08 dB/m after 30kGy integrated exposure. B. Todd Huffman

  22. Conclusions • Are we Qualified for operation of these fibres at Cold Temperatures? • Definite Maybe. • Extrapolation very conservative, but very dodgy • Ideally we would obtain close to a full SLHC dose (~400kGy) cold • Brigitte can do this • Smaller volume. • Potentially higher heat load. • Peltier system would surely fail. B. Todd Huffman

  23. Conclusions • We believe a CO2 thermal management system can achieve the same goal at the higher dose facility. • Studying the feasibility of this. • Back-up is to use dry-ice. • Previous tests show we obtain -780C for 24 hours even with heat load. • But, such a test would teach us little if fibre ends up with more than 1dB/m RIA. B. Todd Huffman

  24. General future • Cold tests finished by April • Qualified two fibres • Re-qualify Draka fibre with higher bandwidth • Move to qualifications of PLC splitters, LC connectors, full cabling solutions • Mechanical tests B. Todd Huffman

  25. End Of Talk Next Slides are backup slides B. Todd Huffman

  26. Splitter No Longer used! Optical Patch cables Conn. B. Todd Huffman

  27. Ran system for extended time periods. Found stability limitations Extensive tests by J. Hanzlik showed the optical splitter was the main cause of instability. System Stability tests – last year ±1.5 dB absolute stability limitation for MM fibres. B. Todd Huffman

  28. PD PD coupler VCSEL PD PD PD = photo-diode Stability of test system Output from multi-mode fibre (coupler in system) 1.5 • Removing coupler seems to improve stability of MM system dB 0.2 = connector Output from multi-mode fibre (no coupler in system) -.11 VCSEL PD dB -.15 PD = photo-diode = connector B. Todd Huffman 12

  29. Multi-mode fibre InfinicorSX+ RMS variation using 1x4 optical splitter ~0.15 dB RMS variation of single channel – no splitter ~0.0053 dB Single Mode fibre SMF-28 RMS variation using 1x4 optical splitter ~0.014 dB RMS variation of Single channel ~0.042 dB Stability by the Numbers B. Todd Huffman

  30. You can even watch it turn on. RIA oscillationsincrease in amplitude Temp. oscillates& rad. starts B. Todd Huffman

  31. Semi-cold Draka Run -4 deg C B. Todd Huffman

  32. Behavior of Reference fibres Attenuation, dB Attenuation, dB B. Todd Huffman

  33. InfinicorSX+ Temperature Effects B. Todd Huffman

  34. Draka RHP-1 SRH fibre T = -40 C T = -250 C B. Todd Huffman

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