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 UO5: Research in Support of ITER
2:00 PM–5:00 PM,
Thursday, November 8, 2018
OCC
Room: B113-114
Chair: Francesca Turco, Columbia University
Abstract ID: BAPS.2018.DPP.UO5.5
Abstract: UO5.00005 : First demonstration of disruption mitigation using shell pellets for core impurity deposition on DIII-D*
2:48 PM–3:00 PM
Presenter:
Nicholas W Eidietis
(General Atomics)
Authors:
Nicholas W Eidietis
(General Atomics)
Eric M Hollmann
(Univ of California - San Diego)
Paul B Parks
(General Atomics)
Richard A Moyer
(Univ of California - San Diego)
Jeffrey L Herfindal
(Oak Ridge National Lab)
Andrey Lvovskiy
(Oak Ridge Assoc Univ)
Daisuke Shiraki
(Oak Ridge National Lab)
Experiments injecting boron-filled diamond shell pellets into the DIII-D tokamak provide the first demonstration of disruption mitigation through core impurity deposition. Core impurity injection shows promise to provide “inside-out” radiative cooling of the plasma, as well as high impurity assimilation and global stochastization of the plasma field lines to suppress runaway electron seed formation [1]. The shell pellet technique utilizes a thin, minimally perturbative shell to transport the enclosed radiating impurity (boron dust) to the plasma core before dispersal, delaying the onset of global MHD that is typically initiated by conventional edge-cooling techniques (e.g. massive gas injection). Visible imaging shows the shell ablating gradually until the boron is released near the magnetic axis. 0-D mitigation metrics generally improve with injection velocity, indicative of the importance of deep deposition. Density measurements account for a large fraction of electrons provided by the pellets, indicating high impurity assimilation fraction. Future work and the design of ITER-relevant shells are discussed.
[1] V. A. Izzo and P. B. Parks, Phys. Plasmas 24, 060705 (2017)
*Work supported by the US DOE under Awards DE-FC02-04ER54698, DE-FG02-07ER54917, and DE-AC05-00OR22725
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.UO5.5
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