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LBNE Target Irradiation Damage Studies at BLIP: Challenges and Progress

Learn about recent studies at BLIP, analyzing materials under proton-induced irradiation for LBNE target experiments. Discover the surprising findings, upcoming post-irradiation studies, and insights into maintaining target integrity for successful LBNE operations.

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LBNE Target Irradiation Damage Studies at BLIP: Challenges and Progress

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  1. Long Baseline Neutrino Experiment Target Irradiation Damage Studies at BLIP Experiment Status N. Simos Help from: L. Mausner, H. Kirk, H. Ludewig, N. Souchlas, N. Mokhov, P. Hurh, J. Misek, B. Zwaska, J. Hylen

  2. What is LBNE and to Where ? Neutrino SuperBeam from AGS LBNE from Fermilab

  3. Why LBNE target experiment and why BLIP? • A series of recent BNL studies at BLIP revealed surprising results regarding some materials of interest and their ability to withstand proton-induced irradiation (i.e. graphite, CC) – First signs of “trouble” observed with LHC collimator materials • A repeatable fluence threshold (~ 10^21 p/cm2) was identified using the BNL Linac at 200 MeV • Fermilab NuMI target (120 GeV) performance adhered to similar fluence limitations (~ factor of 4 higher) leading to questions such: why the difference? • Detailed studies (Fermilab/BNL) of interaction of matter with protons at different energies confirmed that the observed higher rate at BLIP is true!!

  4. Running at BLIP 0.42 dpa in 9 weeks (graphite) 400 W/g power density 9 weeks ~ 1 LBNE year at 700 kW

  5. Challenges in getting experiment off the ground • MUST work in tandem with Isotope Producing Operation • incident energy of ~112.6 MeV (102 MeV on first isotope target) • Gaussian beam similar to 117 MeV operation • Work with quantized Linac energy (139, 160.5, 181, 202) • While degrading the beam appropriately, design target configuration to operate within desired temperature bands so to mimic actual LBNE operations (avoid runaway temperatures especially in encapsulated targets) • Array of analyses and multitude of iterations proceeded the adoption of final configuration (MARS, MCNPX, SRIM, heat transfer and thermo-mechanical)

  6. So, following a 9-week irradiation phase at BLIP the real work will begin to identify: • Threshold for different graphite & CC so LBNE target lifetime can be assessed • Role of environment (vacuum, water cooled, or inert gas) in damage rate and lifetime • Targets currently in beam until the end of FY10 run • Post-irradiation study in hot labs of Bldg. 801 over the summer

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