Utilization of boron particulate wall conditioning in the full tungsten environment of WEST

the WEST Team

doi:10.1016/j.nme.2024.101726

Utilization of boron particulate wall conditioning in the full tungsten environment of WEST

the WEST Team

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Over a series of experiments performed on the WEST device we have demonstrated the ability to perform controlled impurity injections and improve overall wall conditions. Positive changes to overall machine conditions are evidenced by reduced native impurity content after injection as well as decreases in radiated power and reductions in recycling. These results are consistent with the formation of a gettering layer which provides a particle sink and a reduction of source terms. We also observe a reduction in overall Z_eff at the conclusion of the powder injection period consistent with a reduced impurity burden within the plasma. Finally, we have demonstrated a minimal injection quantity required to affect a positive change in wall conditions. These results confirm that plasma assisted deposition of conditioning material through particulate injection shows substantial promise as a supplemental wall conditioning technique.

Original language	English
Article number	101726
Journal	Nuclear Materials and Energy
Volume	40
DOIs	https://doi.org/10.1016/j.nme.2024.101726
State	Published - Sep 2024

Funding

This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences under Awards DE-AC02-09CH11466 (PPPL), and DE-AC05-00OR22725 (ORNL). The United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. This material is based upon work supported by the U.S. Department of Energy , Office of Science , Office of Fusion Energy Sciences under Awards DE-AC02-09CH11466 ( PPPL )

Keywords

Boron conditioning
Powder dropper
Tungsten

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10.1016/j.nme.2024.101726

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title = "Utilization of boron particulate wall conditioning in the full tungsten environment of WEST",

abstract = "Over a series of experiments performed on the WEST device we have demonstrated the ability to perform controlled impurity injections and improve overall wall conditions. Positive changes to overall machine conditions are evidenced by reduced native impurity content after injection as well as decreases in radiated power and reductions in recycling. These results are consistent with the formation of a gettering layer which provides a particle sink and a reduction of source terms. We also observe a reduction in overall Zeff at the conclusion of the powder injection period consistent with a reduced impurity burden within the plasma. Finally, we have demonstrated a minimal injection quantity required to affect a positive change in wall conditions. These results confirm that plasma assisted deposition of conditioning material through particulate injection shows substantial promise as a supplemental wall conditioning technique.",

keywords = "Boron conditioning, Powder dropper, Tungsten",

author = "\{the WEST Team\} and R. Lunsford and A. Gallo and Ph Moreau and A. Diallo and K. Afonin and A. Nagy and Pellissier, \{F. P.\} and C. Guillemaut and Gunn, \{J. P.\} and C. Bourdelle and C. Desgranges and P. Manas and Klepper, \{C. C.\} and E. Tsitrone and Unterberg, \{E. A.\} and L. Vermare",

note = "Publisher Copyright: {\textcopyright} 2024",

year = "2024",

month = sep,

doi = "10.1016/j.nme.2024.101726",

language = "English",

volume = "40",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

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TY - JOUR

T1 - Utilization of boron particulate wall conditioning in the full tungsten environment of WEST

AU - the WEST Team

AU - Lunsford, R.

AU - Gallo, A.

AU - Moreau, Ph

AU - Diallo, A.

AU - Afonin, K.

AU - Nagy, A.

AU - Pellissier, F. P.

AU - Guillemaut, C.

AU - Gunn, J. P.

AU - Bourdelle, C.

AU - Desgranges, C.

AU - Manas, P.

AU - Klepper, C. C.

AU - Tsitrone, E.

AU - Unterberg, E. A.

AU - Vermare, L.

PY - 2024/9

Y1 - 2024/9

N2 - Over a series of experiments performed on the WEST device we have demonstrated the ability to perform controlled impurity injections and improve overall wall conditions. Positive changes to overall machine conditions are evidenced by reduced native impurity content after injection as well as decreases in radiated power and reductions in recycling. These results are consistent with the formation of a gettering layer which provides a particle sink and a reduction of source terms. We also observe a reduction in overall Zeff at the conclusion of the powder injection period consistent with a reduced impurity burden within the plasma. Finally, we have demonstrated a minimal injection quantity required to affect a positive change in wall conditions. These results confirm that plasma assisted deposition of conditioning material through particulate injection shows substantial promise as a supplemental wall conditioning technique.

AB - Over a series of experiments performed on the WEST device we have demonstrated the ability to perform controlled impurity injections and improve overall wall conditions. Positive changes to overall machine conditions are evidenced by reduced native impurity content after injection as well as decreases in radiated power and reductions in recycling. These results are consistent with the formation of a gettering layer which provides a particle sink and a reduction of source terms. We also observe a reduction in overall Zeff at the conclusion of the powder injection period consistent with a reduced impurity burden within the plasma. Finally, we have demonstrated a minimal injection quantity required to affect a positive change in wall conditions. These results confirm that plasma assisted deposition of conditioning material through particulate injection shows substantial promise as a supplemental wall conditioning technique.

KW - Boron conditioning

KW - Powder dropper

KW - Tungsten

UR - https://www.scopus.com/pages/publications/85202678835

U2 - 10.1016/j.nme.2024.101726

DO - 10.1016/j.nme.2024.101726

M3 - Article

AN - SCOPUS:85202678835

SN - 2352-1791

VL - 40

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

M1 - 101726

ER -

Utilization of boron particulate wall conditioning in the full tungsten environment of WEST

Abstract

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Keywords

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