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Title: Response of impurity particle confinement time to external actuators in QH-mode plasmas on DIII-D

A series of quiescent H-mode discharges have been executed with the specific aim of determining the particle confinement time of impurities in the presence of the edge harmonic oscillation. These discharges utilize non-intrinsic, non-recycling fully-stripped fluorine as the diagnostic species monitored by charge-exchange recombination spectroscopy. It is found that the EHO is an efficient means of impurity expulsion from the core plasma, with impurity exhaust rates comparable to or exceeding those in companion ELMing discharges. Furthermore, as the external torque from neutral beam injection is lowered, the global energy confinement time increases while the impurity confinement time does not display an increase.
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [3]
  1. Princeton Univ., Princeton, NJ (United States). Princeton Plasma Physics Lab.
  2. General Atomics, San Diego, CA (United States)
  3. Univ. of Strathclyde, Glasgow (United Kingdom)
Publication Date:
Grant/Contract Number:
FC02-04ER54698
Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 54; Journal Issue: 11; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma properties; plasma impurities; optical measurements
OSTI Identifier:
1353062

Grierson, Brian A., Burrell, Keith H., Garofalo, Andrea M., Solomon, Wayne M., Diallo, Ahmed, and O'Mullane, M.. Response of impurity particle confinement time to external actuators in QH-mode plasmas on DIII-D. United States: N. p., Web. doi:10.1088/0029-5515/54/11/114011.
Grierson, Brian A., Burrell, Keith H., Garofalo, Andrea M., Solomon, Wayne M., Diallo, Ahmed, & O'Mullane, M.. Response of impurity particle confinement time to external actuators in QH-mode plasmas on DIII-D. United States. doi:10.1088/0029-5515/54/11/114011.
Grierson, Brian A., Burrell, Keith H., Garofalo, Andrea M., Solomon, Wayne M., Diallo, Ahmed, and O'Mullane, M.. 2014. "Response of impurity particle confinement time to external actuators in QH-mode plasmas on DIII-D". United States. doi:10.1088/0029-5515/54/11/114011. https://www.osti.gov/servlets/purl/1353062.
@article{osti_1353062,
title = {Response of impurity particle confinement time to external actuators in QH-mode plasmas on DIII-D},
author = {Grierson, Brian A. and Burrell, Keith H. and Garofalo, Andrea M. and Solomon, Wayne M. and Diallo, Ahmed and O'Mullane, M.},
abstractNote = {A series of quiescent H-mode discharges have been executed with the specific aim of determining the particle confinement time of impurities in the presence of the edge harmonic oscillation. These discharges utilize non-intrinsic, non-recycling fully-stripped fluorine as the diagnostic species monitored by charge-exchange recombination spectroscopy. It is found that the EHO is an efficient means of impurity expulsion from the core plasma, with impurity exhaust rates comparable to or exceeding those in companion ELMing discharges. Furthermore, as the external torque from neutral beam injection is lowered, the global energy confinement time increases while the impurity confinement time does not display an increase.},
doi = {10.1088/0029-5515/54/11/114011},
journal = {Nuclear Fusion},
number = 11,
volume = 54,
place = {United States},
year = {2014},
month = {11}
}