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Title: Impurity seeding for suppression of the near scrape-off layer heat flux feature in tokamak limited plasmas

Abstract

In inboard-limited plasmas, foreseen to be used in future fusion reactor start-up and ramp down phases, the Scrape-Off Layer (SOL) exhibits two regions: the “near” and “far” SOL. The steep radial gradient of the parallel heat flux associated with the near SOL can result in excessive thermal loads onto the solid surfaces, damaging them and/or limiting the operational space of a fusion reactor. In this article, leveraging the results presented in the study by F. Nespoli et al. [Nucl. Fusion 57, 126029 (2017)], we propose a technique for the mitigation and suppression of the near SOL heat flux feature by impurity seeding. Here, the first successful experimental results from the TCV tokamak are presented and discussed.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
  1. Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne (Switzerland). Swiss Plasma Center (SPC)
  2. Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne (Switzerland). Swiss Plasma Center (SPC); Univ. of California-San Diego, La Jolla, CA (United States)
  3. Univ. of California-San Diego, La Jolla, CA (United States)
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
Contributing Org.:
TCV Team
OSTI Identifier:
1540175
Alternate Identifier(s):
OSTI ID: 1435485
Grant/Contract Number:  
SC0010529
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; physics

Citation Formats

Nespoli, F., Labit, B., Furno, I., Theiler, C., Sheikh, U. A., Tsui, C. K., and Boedo, J. A. Impurity seeding for suppression of the near scrape-off layer heat flux feature in tokamak limited plasmas. United States: N. p., 2018. Web. doi:10.1063/1.5023201.
Nespoli, F., Labit, B., Furno, I., Theiler, C., Sheikh, U. A., Tsui, C. K., & Boedo, J. A. Impurity seeding for suppression of the near scrape-off layer heat flux feature in tokamak limited plasmas. United States. doi:10.1063/1.5023201.
Nespoli, F., Labit, B., Furno, I., Theiler, C., Sheikh, U. A., Tsui, C. K., and Boedo, J. A. Tue . "Impurity seeding for suppression of the near scrape-off layer heat flux feature in tokamak limited plasmas". United States. doi:10.1063/1.5023201. https://www.osti.gov/servlets/purl/1540175.
@article{osti_1540175,
title = {Impurity seeding for suppression of the near scrape-off layer heat flux feature in tokamak limited plasmas},
author = {Nespoli, F. and Labit, B. and Furno, I. and Theiler, C. and Sheikh, U. A. and Tsui, C. K. and Boedo, J. A.},
abstractNote = {In inboard-limited plasmas, foreseen to be used in future fusion reactor start-up and ramp down phases, the Scrape-Off Layer (SOL) exhibits two regions: the “near” and “far” SOL. The steep radial gradient of the parallel heat flux associated with the near SOL can result in excessive thermal loads onto the solid surfaces, damaging them and/or limiting the operational space of a fusion reactor. In this article, leveraging the results presented in the study by F. Nespoli et al. [Nucl. Fusion 57, 126029 (2017)], we propose a technique for the mitigation and suppression of the near SOL heat flux feature by impurity seeding. Here, the first successful experimental results from the TCV tokamak are presented and discussed.},
doi = {10.1063/1.5023201},
journal = {Physics of Plasmas},
number = 5,
volume = 25,
place = {United States},
year = {2018},
month = {5}
}

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Works referenced in this record:

Scrape-off layer properties of ITER-like limiter start-up plasmas in JET
journal, June 2013


Overview of the TCV tokamak program: scientific progress and facility upgrades
journal, June 2017


Understanding and suppressing the near scrape-off layer heat flux feature in inboard-limited plasmas in TCV
journal, September 2017


Understanding narrow SOL power flux component in COMPASS limiter plasmas by use of Langmuir probes
journal, August 2015


Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime
journal, July 1999

  • Sauter, O.; Angioni, C.; Lin-Liu, Y. R.
  • Physics of Plasmas, Vol. 6, Issue 7
  • DOI: 10.1063/1.873240

Dynamic fuel retention and release under ITER like wall conditions in JET
journal, July 2013


Impact of a narrow limiter SOL heat flux channel on the ITER first wall panel shaping
journal, February 2015


In–out impurity density asymmetry in the pedestal region of Alcator C-Mod
journal, November 2013


Simulation of plasma current ramp-up with reduced magnetic flux consumption in JT-60SA
journal, April 2015


Ohmic flux consumption during initial operation of the NSTX spherical torus
journal, September 2001


Poloidal flux linkage requirements for the International Thermonuclear Experimental Reactor
journal, August 1994


Heat loads in inboard limited L-mode plasmas in TCV
journal, August 2015


Narrow heat flux channels in the COMPASS limiter scrape-off layer
journal, August 2015


Thermal load distribution on the ALT-II limiter of TEXTOR-94 during RI mode operation and during disruptions
journal, March 2000


Reduction of poloidal magnetic flux consumption during plasma current ramp-up in DEMO relevant plasma regimes
journal, October 2016


Measurement of inner wall limiter SOL widths in KSTAR tokamak
journal, August 2017


Tokamak equilibrium reconstruction using Faraday rotation measurements
journal, October 1988


Alcator C-Mod: research in support of ITER and steps beyond
journal, July 2015


High Confinement and High Density with Stationary Plasma Energy and Strong Edge Radiation in the TEXTOR-94 Tokamak
journal, September 1996


Poloidal asymmetry in the narrow heat flux feature in the TCV scrape-off layer
journal, June 2017

  • Tsui, C. K.; Boedo, J. A.; Halpern, F. D.
  • Physics of Plasmas, Vol. 24, Issue 6
  • DOI: 10.1063/1.4985075

Scrape-off-layer current loops and floating potential in limited tokamak plasmas
journal, December 2017


Partial detachment of high power discharges in ASDEX Upgrade
journal, April 2015


Impurity-seeded plasma experiments on JET
journal, December 2002


Radiative edges under control by impurity fluxes
journal, December 1993


Volt-second analysis and consumption in Doublet III plasmas
journal, October 1982


Plasma surface interactions in impurity seeded plasmas
journal, August 2011


Hydrogen inventories in nuclear fusion devices
journal, March 2001


Power deposition on the DIII-D inner wall limiter
journal, August 2015