Speaker
Description
As part of the IFMIF/EVEDA project, the Linear IFMIF Prototype Accelerator (LIPAc) was constructed at Rokkasho, Japan, and a Superconducting Radio-Frequency (SRF) accelerator has been installed for the upcoming 9 MeV deuteron beam campaign. In the previous 5 MeV beam experiments, radiation transport analyses using MCNP relied on manually created geometry models including only major components. However, beam losses in the SRF are critical due to its very small acceptance (10 W total), and accurate evaluation of neutron and photon transport is required for reliable interpretation of signals from beam loss monitors installed around the SRF.
Because of the complex structure of the SRF, manual MCNP modeling has significant limitations. In this study, the effectiveness of automatically converting SRF CAD data into a detailed MCNP model was investigated using the open-source conversion tool GEOUNED. A preliminary neutron transport analysis was performed using the converted MCNP model, assuming a beam loss at the center of the SRF beamline represented by a 1 MeV neutron point source. The detailed model reproduces internal SRF components, including solenoids and cavities, resulting in complex neutron interactions and a non-uniform flux distribution. These results demonstrate that accurate identification of beam loss locations and intensities requires radiation transport analyses that explicitly account for the internal SRF structures.
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