The Analysis of the External Neutron Monitor Responses in a Simplified JET-Like Tokamak Using ADVANTG. (17th February 2017)

• Record Type: Journal Article
• Authors: Čufar, Aljaž; Kos, Bor; Kodeli, Ivan Aleksander; Lengar, Igor; Štancar, Žiga; Snoj, Luka
• Is Part Of: Fusion science and technology. Volume 71:Number 2(2017)
• Page Start: 162
• Page End: 176
• Publication Date: 2017-02-17
• Subjects: ADVANTG -- MCNP -- variance reduction; Fusion reactors -- Periodicals; Nuclear fusion -- Periodicals; Fusion reactors; Nuclear fusion; Periodicals; 621.48405
• DOI: 10.13182/FST16-113
• Languages: English
• ISSNs: 1536-1055

Abstract

Abstract : The application of theA utomated V a rian ce Reduct ionG enerator (ADVANTG) code to accelerate MCNP neutron transport calculations in fusion-relevant geometries is presented. The ADVANTG code generates variance-reduction parameters using the Consistent Adjoint Driven Importance Sampling (CADIS) and Forward-Weighted Consistent Adjoint Driven Importance Sampling (FW-CADIS) methods based on deterministic transport calculations performed by the discrete ordinates code Denovo. The aim of ADVANTG is to reduce the MCNP computational time by automating the process of variance-reduction parameter generation. ADVANTG was tested on a simplified model of a JET-like tokamak that in spite of its simplicity retains all the major characteristics of such a tokamak. The performance of the nuclear data libraries provided with ADVANTG and of various other ADVANTG/Denovo settings on variance-reduction efficiency was tested. Several cases using deuterium-deuterium or deuterium-tritium (D-T) volumetric (plasma) sources and 252 Cf or D-T point neutron sources were analyzed to find guidelines for successful use of the code for fusion applications. Additionally, the use of ADVANTG as a tool to identify major neutron pathways from the neutron source to the detector is demonstrated.