Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session UP11: Poster Session VIII: In-Person, Hall A (2:00-3:30pm) and Virtual Poster Presentations (3:45-5:00pm)
MFE: Whole Device Modeling, High Field Tokamaks, Tokamak Physics, DIII-D
FUND:Reconnection, Turbulence
2:00 PM - 5:00 PM
Thursday, October 20, 2022
Room: Exhibit Hall A and Online
Abstract: UP11.00030 : Neutronics modeling of activation diagnostics in SPARC*
Presenter:
John L Ball
(Massachusetts Institute of Technology)
Authors:
John L Ball
(Massachusetts Institute of Technology)
Shon P Mackie
(MIT, Department of Physics)
Roy A Tinguely
(Massachusetts Institute of Technology)
maximum of 140 MW of DT fusion power and thus a total neutron rate of approximately 5 × 10^19 n/s
(Creely et al. 2020). Activation diagnostics have been used with success on both TFTR and JET during DT
operation to measure time-integrated fusion power in combination with other diagnostics (Jarvis et al. 1991)
(Nieschmidt, 1986). SPARC plans to use activation diagnostics in combination with fission-chamber based
flux monitors to measure fusion energy during both DD and DT operation. The Monte-Carlo neutronics
code OpenMC is used to model the neutron flux in various locations in the device in order to assess possible
activation foil locations as well as predict the induced activity. A realistic SPARC geometry is used with
several different neutron source configurations in order to asses the sensitivity of the system to source geom-
etry and energy spectrum. A target activity of 100 μCuries is used to design the activation foil geometry.
Various possible activation foil materials are then analyzed including Silicon-28, Zirconium-90, and Iron-56.
*Work supported by Commonwealth Fusion Systems.
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