BNL, Upton, Long Island, New York
Fermilab, Batavia
Proton irradiation effects on materials supporting high power experiments have been studied extensively using the BNL 200 MeV proton beam and the target station of the Linear Isotope Producer (BLIP). The goal has been to (a) observe changes in physio-mechanical properties in widely used materials and in new alloys and composites induced by energetic protons, (b) identify thresholds of flux/fluence, (c) study the role of temperature in damage reversal, and (d) correlate damage effects of different species such as energetic protons and neutrons. Experience data from experiments, i.e. NuMI, on target performance have been integrated with observations and aided by simulation studies to assess the role of energy and irradiation rate. Based on the correlation experimental results, experience data and simulation studies, new irradiation experiments linked to the long baseline neutrino experiment (LBNE) have been designed and performed. Results of irradiation studies in support of the neutrino factory initiative, the LBNE and the LHC will be presented and coupled with confirmatory simulations employed to reconcile experimental observations with anticipated NuMI target performance.
Fermilab, Batavia
STFC/RAL, Chilton, Didcot, Oxon
BNL, Upton, Long Island, New York
The Long Baseline Neutrino Experiment (LBNE) Neutrino Beam Facility at Fermilab will use a high energy proton beam on a solid target to produce a neutrino beam aimed at underground detectors at the DUSEL site in South Dakota. Initial proton beam power is planned to be 700 kW with upgrade capability to greater than 2 MW. Solid target survivability at such incident beam power is of great interest and an R&D program has been started to study the relevant issues. Areas of study include irradiation testing of candidate target materials at the BLIP facility at BNL, multi-physics simulations of solid target/beam interactions at RAL, autopsies of used NuMI targets, high strain rate effects in beryllium, and alternative methods of target cooling. Status and results of these studies are presented as well as a summary of planned future high power target R&D efforts.