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Title: Active conditioning of ASDEX Upgrade tungsten plasma-facing components and discharge enhancement through boron and boron nitride particulate injection

Abstract

The injection of boron (B) and boron nitride (BN) powders into ASDEX Upgrade H-mode discharges have demonstrated effective control of tungsten influx in low density/collisionality operational regimes, similar to conventional boronization methods. Sub-mm powder particles are gravitationally accelerated into the upper edge of a lower single null H-mode plasma with a boundary shape roughly conforming to the shape of the poloidal midplane limiters. Visible spectroscopy measurements at one of the outer limiter showed increases in both B and N signal levels, as well as elevated B levels in the divertor, and an increase in total radiated power by greater than a factor of two during BN injection. Globally the BN injection improved energy confinement by 10%–20%, associated with improvements in pedestal performance similar to gaseous N injection. Following conditioning discharges with B powder injection, three low gas-fueling discharges with magnetic perturbations for ELM suppression were successfully conducted. Furthermore, these first results suggest that the application of B containing powders can be used to both improve plasma performance in real-time, and to improve overall wall conditions for subsequent discharges.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1];  [2];  [2]; ORCiD logo [2]; ORCiD logo [2];  [2];  [2];  [1];  [1];  [1];  [1];  [2];  [2]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Max-Planck-Institut fur Plasmaphysik, Garching (Germany)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
the ASDEX Upgrade team
OSTI Identifier:
1562453
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 59; Journal Issue: 12; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; boronization; boron powder; ASDEX-Upgrade; boron nitride

Citation Formats

Lunsford, R., Rohde, Volker, Bortolon, Alessandro, Dux, Ralph, Herrmann, Albrecht, Kallenbach, Arne, McDermott, Rachael M., David, Pierre, Drenik, Aleksander, Laggner, Florian, Maingi, Rajesh, Mansfield, D. K., Nagy, Alexander, Neu, Rudolf, and Wolfrum, Elisabeth. Active conditioning of ASDEX Upgrade tungsten plasma-facing components and discharge enhancement through boron and boron nitride particulate injection. United States: N. p., 2019. Web. doi:10.1088/1741-4326/ab4095.
Lunsford, R., Rohde, Volker, Bortolon, Alessandro, Dux, Ralph, Herrmann, Albrecht, Kallenbach, Arne, McDermott, Rachael M., David, Pierre, Drenik, Aleksander, Laggner, Florian, Maingi, Rajesh, Mansfield, D. K., Nagy, Alexander, Neu, Rudolf, & Wolfrum, Elisabeth. Active conditioning of ASDEX Upgrade tungsten plasma-facing components and discharge enhancement through boron and boron nitride particulate injection. United States. doi:10.1088/1741-4326/ab4095.
Lunsford, R., Rohde, Volker, Bortolon, Alessandro, Dux, Ralph, Herrmann, Albrecht, Kallenbach, Arne, McDermott, Rachael M., David, Pierre, Drenik, Aleksander, Laggner, Florian, Maingi, Rajesh, Mansfield, D. K., Nagy, Alexander, Neu, Rudolf, and Wolfrum, Elisabeth. Mon . "Active conditioning of ASDEX Upgrade tungsten plasma-facing components and discharge enhancement through boron and boron nitride particulate injection". United States. doi:10.1088/1741-4326/ab4095. https://www.osti.gov/servlets/purl/1562453.
@article{osti_1562453,
title = {Active conditioning of ASDEX Upgrade tungsten plasma-facing components and discharge enhancement through boron and boron nitride particulate injection},
author = {Lunsford, R. and Rohde, Volker and Bortolon, Alessandro and Dux, Ralph and Herrmann, Albrecht and Kallenbach, Arne and McDermott, Rachael M. and David, Pierre and Drenik, Aleksander and Laggner, Florian and Maingi, Rajesh and Mansfield, D. K. and Nagy, Alexander and Neu, Rudolf and Wolfrum, Elisabeth},
abstractNote = {The injection of boron (B) and boron nitride (BN) powders into ASDEX Upgrade H-mode discharges have demonstrated effective control of tungsten influx in low density/collisionality operational regimes, similar to conventional boronization methods. Sub-mm powder particles are gravitationally accelerated into the upper edge of a lower single null H-mode plasma with a boundary shape roughly conforming to the shape of the poloidal midplane limiters. Visible spectroscopy measurements at one of the outer limiter showed increases in both B and N signal levels, as well as elevated B levels in the divertor, and an increase in total radiated power by greater than a factor of two during BN injection. Globally the BN injection improved energy confinement by 10%–20%, associated with improvements in pedestal performance similar to gaseous N injection. Following conditioning discharges with B powder injection, three low gas-fueling discharges with magnetic perturbations for ELM suppression were successfully conducted. Furthermore, these first results suggest that the application of B containing powders can be used to both improve plasma performance in real-time, and to improve overall wall conditions for subsequent discharges.},
doi = {10.1088/1741-4326/ab4095},
journal = {Nuclear Fusion},
number = 12,
volume = 59,
place = {United States},
year = {2019},
month = {10}
}

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