Abstract
Argonne pioneered the pulsed spallation neutron source with the ZING-P and IPNS-I concepts. IPNS-I is now a reliable and actively used source for pulsed spallation neutrons. The accelerator is a 500 MeV, 8-9 ..mu..a, 30 Hz rapid cycling proton synchrotron. Other neutron spallation sources are now in operation or in construction. These include KENS-I at the National Laboratory for High Energy Physics in Japan, the WNR/PSR at Los Alamos National Laboratory, and the SNS at the Rutherford Appleton Laboratory in England. Newer and bolder concepts being developed for more intense pulsed spallation neutron sources include SNQ at the KFA Laboratory in Germany, ASTOR at the Swiss Institute for Nuclear Physics, and ASPUN, the Argonne concept. ASPUN, presented in this paper, is based on the Fixed-Field Alternating Gradient concept. The design goal is to provide a time-averaged beam of 3.5 ma at 1100 MeV on a spallation target in intense bursts, 100-200 nanoseconds long, at a repetition rate of no more than 60 to 85 Hz. Design parameters are given.
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