STFC/RAL, Chilton, Didcot, Oxon
Kyoto University, Kyoto
KEK, Ibaraki
The T2K experiment began operation in April 2009. It utilises what is projected to become the world’s highest pulsed power proton beam at 0.75 MW to generate an intense neutrino beam. T2K uses the conventional technique of interacting the 30 GeV proton beam with a graphite target and using a magnetic horn system to collect pions of one charge and focus them into a decay volume where the neutrino beam is produced. The target is a two interaction length (900 mm long) graphite target supported directly within the bore of the first magnetic horn which generates the required field with a pulsed current of 320 kA. The talk will describe the design and development of the target system, the beam windows and the beam absorber required to meet the demanding requirements of the T2K facility. Challenges include radiation damage, stress waves, design and optimisation of the helium coolant flow, and integration with the pulsed magnetic horn. Conceptual and detailed engineering studies were required to develop a target system that could satisfy these requirements and could also be replaced remotely in the event of failure.
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.