Wall conditioning effects of boron powder injection in KSTAR with a tungsten divertor
Boron powder dropped into KSTAR plasmas decreased the radiated power, core electron density, and $Z_\mathrm {eff}$ , indicating that the ablated and redeposited boron powder helped to condition the plasma-facing surfaces. Visible line emission of oxygen and tungsten were also reduced by 50% (80%) wi...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | Nuclear Fusion |
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| Online Access: | https://doi.org/10.1088/1741-4326/adf123 |
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| author | Hanna Schamis Erik P. Gilson Hyungho Lee Rajesh Maingi SangKyeun Kim Joseph A. Snipes SeongMoo Yang Alessandro Bortolon Juhyeok Jang Boseong Kim Dongcheol Seo Jaein Song Hyunmyeong Lee the KSTAR collaboration |
| author_facet | Hanna Schamis Erik P. Gilson Hyungho Lee Rajesh Maingi SangKyeun Kim Joseph A. Snipes SeongMoo Yang Alessandro Bortolon Juhyeok Jang Boseong Kim Dongcheol Seo Jaein Song Hyunmyeong Lee the KSTAR collaboration |
| author_sort | Hanna Schamis |
| collection | DOAJ |
| description | Boron powder dropped into KSTAR plasmas decreased the radiated power, core electron density, and $Z_\mathrm {eff}$ , indicating that the ablated and redeposited boron powder helped to condition the plasma-facing surfaces. Visible line emission of oxygen and tungsten were also reduced by 50% (80%) with boron injection into H-mode (L-mode) discharges that used the new KSTAR tungsten monoblock lower divertor. Dynamic particle balance analysis found a negligible difference in the inferred wall pumping rate during the steady portion of the discharges. It is inferred that the observed conditioning effects were principally caused by a reduction in intrinsic impurities as opposed to a reduction in wall recycling. These results are in qualitative agreement with low- Z injected powder experiments across many fusion devices, confirming the utility of low- Z powder injection as a real-time wall conditioning tool. |
| format | Article |
| id | doaj-art-bd7970cc31154c77a25e1dd3feed2598 |
| institution | Kabale University |
| issn | 0029-5515 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Nuclear Fusion |
| spelling | doaj-art-bd7970cc31154c77a25e1dd3feed25982025-08-20T03:34:36ZengIOP PublishingNuclear Fusion0029-55152025-01-0165808603710.1088/1741-4326/adf123Wall conditioning effects of boron powder injection in KSTAR with a tungsten divertorHanna Schamis0https://orcid.org/0000-0002-5685-2494Erik P. Gilson1https://orcid.org/0000-0001-6820-9132Hyungho Lee2Rajesh Maingi3https://orcid.org/0000-0003-1238-8121SangKyeun Kim4https://orcid.org/0000-0002-0701-8962Joseph A. Snipes5https://orcid.org/0000-0002-7077-5077SeongMoo Yang6https://orcid.org/0000-0003-1214-1268Alessandro Bortolon7https://orcid.org/0000-0002-0094-0209Juhyeok Jang8https://orcid.org/0000-0002-9991-6072Boseong Kim9Dongcheol Seo10Jaein Song11Hyunmyeong Lee12the KSTAR collaboration13Princeton Plasma Physics Laboratory , Princeton, NJ, United States of AmericaPrinceton Plasma Physics Laboratory , Princeton, NJ, United States of AmericaKorea Institute of Fusion Energy , Daejeon, Korea, Republic OfPrinceton Plasma Physics Laboratory , Princeton, NJ, United States of AmericaPrinceton Plasma Physics Laboratory , Princeton, NJ, United States of AmericaPrinceton Plasma Physics Laboratory , Princeton, NJ, United States of AmericaPrinceton Plasma Physics Laboratory , Princeton, NJ, United States of AmericaPrinceton Plasma Physics Laboratory , Princeton, NJ, United States of AmericaKorea Institute of Fusion Energy , Daejeon, Korea, Republic OfKorea Institute of Fusion Energy , Daejeon, Korea, Republic OfKorea Institute of Fusion Energy , Daejeon, Korea, Republic OfKorea Institute of Fusion Energy , Daejeon, Korea, Republic OfKorea Institute of Fusion Energy , Daejeon, Korea, Republic OfKorea Institute of Fusion Energy , Daejeon, Korea, Republic OfBoron powder dropped into KSTAR plasmas decreased the radiated power, core electron density, and $Z_\mathrm {eff}$ , indicating that the ablated and redeposited boron powder helped to condition the plasma-facing surfaces. Visible line emission of oxygen and tungsten were also reduced by 50% (80%) with boron injection into H-mode (L-mode) discharges that used the new KSTAR tungsten monoblock lower divertor. Dynamic particle balance analysis found a negligible difference in the inferred wall pumping rate during the steady portion of the discharges. It is inferred that the observed conditioning effects were principally caused by a reduction in intrinsic impurities as opposed to a reduction in wall recycling. These results are in qualitative agreement with low- Z injected powder experiments across many fusion devices, confirming the utility of low- Z powder injection as a real-time wall conditioning tool.https://doi.org/10.1088/1741-4326/adf123wall conditioningboron powder injectionplasma-material interactions |
| spellingShingle | Hanna Schamis Erik P. Gilson Hyungho Lee Rajesh Maingi SangKyeun Kim Joseph A. Snipes SeongMoo Yang Alessandro Bortolon Juhyeok Jang Boseong Kim Dongcheol Seo Jaein Song Hyunmyeong Lee the KSTAR collaboration Wall conditioning effects of boron powder injection in KSTAR with a tungsten divertor Nuclear Fusion wall conditioning boron powder injection plasma-material interactions |
| title | Wall conditioning effects of boron powder injection in KSTAR with a tungsten divertor |
| title_full | Wall conditioning effects of boron powder injection in KSTAR with a tungsten divertor |
| title_fullStr | Wall conditioning effects of boron powder injection in KSTAR with a tungsten divertor |
| title_full_unstemmed | Wall conditioning effects of boron powder injection in KSTAR with a tungsten divertor |
| title_short | Wall conditioning effects of boron powder injection in KSTAR with a tungsten divertor |
| title_sort | wall conditioning effects of boron powder injection in kstar with a tungsten divertor |
| topic | wall conditioning boron powder injection plasma-material interactions |
| url | https://doi.org/10.1088/1741-4326/adf123 |
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