Bulletin of the American Physical Society
60th Annual Meeting of the APS Division of Plasma Physics
Volume 63, Number 11
Monday–Friday, November 5–9, 2018; Portland, Oregon
Session JP11: Poster Session IV: Education and Outreach; Undergraduate or High School Research; Plasma technology, Fusion reactor Nuclear and Materials Science; Propulsion; Materials Interfaces (2:00pm-5:00pm)
Tuesday, November 6, 2018
OCC Room: Exhibit Hall A1&A
Abstract ID: BAPS.2018.DPP.JP11.56
Abstract: JP11.00056 : Imaging MSE measurements of the current density in the pedestal on the high field side of the DIII-D tokamak*
(Colorado State Univ)
(Colorado State Univ)
The imaging motional Stark effect (MSE) diagnostic measures the polarization angle of Stark-split beam emission to create a 2D image of the magnetic field pitch angle. The imaging MSE system presented here is designed to measure beam emission on the high-field side (HFS) of the DIII-D tokamak, including radial resolution of a few cm and sub-cm channel spacing in the pedestal region on the HFS. These are the first high-resolution measurements of the magnetic field pitch angle in the HFS pedestal region on the DIII-D tokamak. HFS pitch angle measurements are used to constrain the EFIT 2D equilibrium solver. As the local pitch angle is not a flux surface quantity, these new HFS measurements add valuable new constraints to preexisting measurements on the low-field side (LFS). Including HFS imaging MSE constraints produces EFITs more similar to kinetic EFITs than EFITs constrained only by the LFS MSE measurements. For example, including the HFS imaging MSE measurements produces EFITs with positive current density across the HFS of the plasma, unlike EFITs constrained with only the LFS MSE measurements.
*Work supported in part by US DoE under the Science Undergraduate Laboratory Internship (SULI) program andunder DE-AC52-07NA27344 and DE-FC02-04ER54698.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.JP11.56
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700