Application of the MCNPX-McStas interface for shielding calculations and guide design at ESS

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Abstract

Recently, an interface between the Monte Carlo code MCNPX and the neutron ray-tracing code MCNPX was developed[1]. Based on the expected neutronic performance and guide geometries relevant for the ESS, the combined MCNPX-McStas code is used to calculate dose rates along neutron beam guides. The generation and moderation of neutrons is simulated using a full scale MCNPX model of the ESS target monolith. Upon entering the beam extraction region, the individual neutron states are handed to McStas via the MCNPX-McStas interface. McStas transports the neutrons through the beam guide and by using newly developed event logging capability, the neutron state parameters corresponding to un-reflected neutrons are recorded at each scattering. This information is handed back to MCNPX where it serves as neutron source input for a second MCNPX simulation. This simulation enables calculation of dose rates in the vicinity of the guide. In addition the logging mechanism is employed to record the scatterings along the guides which is exploited to simulate the supermirror quality requirements (i.e. m-values) needed at different positions along the beam guide to transport neutrons in the same guide/source setup.
Original languageEnglish
Title of host publicationConference proceedings - International Workshop on Neutron Optics and Detectors 2013
Number of pages6
Publication date2013
Publication statusPublished - 2013
EventInternational Workshop on Neutron Optics and Detectors - Commundo Tagungshotel, Ismaning, Germany
Duration: 2 Jul 20135 Jul 2013

Conference

ConferenceInternational Workshop on Neutron Optics and Detectors
LocationCommundo Tagungshotel
CountryGermany
CityIsmaning
Period02/07/201305/07/2013

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