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 YO03: Research in Support of ITER Burning Plasma Physics
9:30 AM–12:30 PM,
Friday, October 21, 2022
Room: Ballroom 100 C
Chair: Florian M. Laggner, North Carolina State University
Abstract: YO03.00012 : Radiation Shielding for ECH Launchers in ITER*
11:42 AM–11:54 AM
Presenter:
Michael J Loughlin
(Oak Ridge National Laboratory)
Author:
Michael J Loughlin
(Oak Ridge National Laboratory)
Collaborations:
Team Acknowledgment: ORNL, ITER
There are several constraints on the shielding of waveguides that penetrate the bioshield and the outer walls of the ITER complex building. Shielding is needed for both neutrons and high-energy gamma rays; it must allow differential movement of systems, provide tritium confinement, and be fire retardant. Borated polyethylene in the penetrations and around the waveguides was replaced by Shieldwerx SWX-277Z-5 to reduce the fire load. This proved insufficient to lower the dose rate in the assembly hall. The introduction of an additional bend would eliminate the direct line of sight but lower the power delivered to the plasma, and it would be impractical to implement at this stage of the construction. A repositioning of the doglegs behind the bioshield would be effective in removing the direct streaming path, but this cannot now be implemented. Shielding on the cooling water system is the preferred solution.
*This research was supported in part by the Office of Science of the US Department of Energy under Contract No. DE-AC05-00OR22725
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