Investigation of the dependence of pe,ped on ne,sep in JET H-Mode plasmas using integrated JETTO-MISHKA-FRANTIC simulations
Experimentally, it has been observed in high-confinement (H-Mode) plasmas with Edge Localised Modes (ELMs) on JET that the pressure pedestal (pe,ped) is degraded by approximately a factor of two when there is a change in electron separatrix density, ne,sep, from 1−4×1019m−3. Previous work using the...
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Elsevier
2023-03-01
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| Series: | Nuclear Materials and Energy |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179123000042 |
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| author | J. Simpson D. Moulton C. Giroud M. Groth L. Horvath F.J. Casson F. Kochl L. Frassinetti G. Corrigan S. Saarelma L. Garzotti D.S. Gahle A. Chankin |
| author_facet | J. Simpson D. Moulton C. Giroud M. Groth L. Horvath F.J. Casson F. Kochl L. Frassinetti G. Corrigan S. Saarelma L. Garzotti D.S. Gahle A. Chankin |
| author_sort | J. Simpson |
| collection | DOAJ |
| description | Experimentally, it has been observed in high-confinement (H-Mode) plasmas with Edge Localised Modes (ELMs) on JET that the pressure pedestal (pe,ped) is degraded by approximately a factor of two when there is a change in electron separatrix density, ne,sep, from 1−4×1019m−3. Previous work using the pedestal stability code EUROPED, has been able to predict the degradation of pe,ped but only for ne,sep≤1.5×1019m−3. In this work, we apply a coupled code JETTO-MISHKA-FRANTIC, to self-consistently predict the transport in the pedestal region and neutral source with varying separatrix conditions. The code feeds back on the transport in the pedestal region to achieve profiles that are marginally stable to ideal MHD modes (continuous ELM model in JETTO).When accounting for the change in electron separatrix temperature (Te,sep), ion separatrix temperature (Ti,sep) and the poloidally integrated neutral flux crossing the separatrix (Γsep,neut) as it changes with ne,sep (according to a scan in ne,sep in the edge code EDGE2D-EIRENE), no degradation in pe,ped was observed in JETTO-MISHKA-FRANTIC in contrast to experiment. Instead, an increase in pe,ped with ne,sep was observed which is driven by an increasing density pedestal (ne,ped). Within the presented JETTO-MISHKA-FRANTIC simulations, changing the pedestal width by a factor of two and a half in normalised poloidal flux (ψn) resulted in an approximately 40% degradation in pe,ped for ne,sep=1−3×1019m−3. This change in pedestal width was not supported by experimental data. A scan in the ratio of particle and energy transport in the pedestal (D/χ) was found to have a negligible effect on pe,ped. Qualitative agreement between JETTO-MISHKA-FRANTIC with EUROPED was found when the input density profiles are identical. |
| first_indexed | 2024-04-10T04:15:09Z |
| format | Article |
| id | doaj.art-918a737e009546cbb46a8c71fa89ffaf |
| institution | Directory Open Access Journal |
| issn | 2352-1791 |
| language | English |
| last_indexed | 2024-04-10T04:15:09Z |
| publishDate | 2023-03-01 |
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| series | Nuclear Materials and Energy |
| spelling | doaj.art-918a737e009546cbb46a8c71fa89ffaf2023-03-12T04:21:28ZengElsevierNuclear Materials and Energy2352-17912023-03-0134101365Investigation of the dependence of pe,ped on ne,sep in JET H-Mode plasmas using integrated JETTO-MISHKA-FRANTIC simulationsJ. Simpson0D. Moulton1C. Giroud2M. Groth3L. Horvath4F.J. Casson5F. Kochl6L. Frassinetti7G. Corrigan8S. Saarelma9L. Garzotti10D.S. Gahle11A. Chankin12CCFE, Culham Science Centre, Abingdon, OX14 3DB, UK; Aalto University, FI-00076 AALTO, Espoo, Finland; Corresponding author at: CCFE, Culham Science Centre, Abingdon, OX14 3DB, UK.CCFE, Culham Science Centre, Abingdon, OX14 3DB, UKCCFE, Culham Science Centre, Abingdon, OX14 3DB, UKAalto University, FI-00076 AALTO, Espoo, FinlandCCFE, Culham Science Centre, Abingdon, OX14 3DB, UKCCFE, Culham Science Centre, Abingdon, OX14 3DB, UKCCFE, Culham Science Centre, Abingdon, OX14 3DB, UKDivision of Fusion Plasma Physics, Royal institute of Technology (KTH), Stockholm SE, SwedenCCFE, Culham Science Centre, Abingdon, OX14 3DB, UKCCFE, Culham Science Centre, Abingdon, OX14 3DB, UKCCFE, Culham Science Centre, Abingdon, OX14 3DB, UKUniversity of Strathclyde, 16 Richmond St, Glasgow G1 1XQ, UKMax–Planck-Institut für Plasmaphysik, Boltzmannstraße 2, D-85748 Garching, GermanyExperimentally, it has been observed in high-confinement (H-Mode) plasmas with Edge Localised Modes (ELMs) on JET that the pressure pedestal (pe,ped) is degraded by approximately a factor of two when there is a change in electron separatrix density, ne,sep, from 1−4×1019m−3. Previous work using the pedestal stability code EUROPED, has been able to predict the degradation of pe,ped but only for ne,sep≤1.5×1019m−3. In this work, we apply a coupled code JETTO-MISHKA-FRANTIC, to self-consistently predict the transport in the pedestal region and neutral source with varying separatrix conditions. The code feeds back on the transport in the pedestal region to achieve profiles that are marginally stable to ideal MHD modes (continuous ELM model in JETTO).When accounting for the change in electron separatrix temperature (Te,sep), ion separatrix temperature (Ti,sep) and the poloidally integrated neutral flux crossing the separatrix (Γsep,neut) as it changes with ne,sep (according to a scan in ne,sep in the edge code EDGE2D-EIRENE), no degradation in pe,ped was observed in JETTO-MISHKA-FRANTIC in contrast to experiment. Instead, an increase in pe,ped with ne,sep was observed which is driven by an increasing density pedestal (ne,ped). Within the presented JETTO-MISHKA-FRANTIC simulations, changing the pedestal width by a factor of two and a half in normalised poloidal flux (ψn) resulted in an approximately 40% degradation in pe,ped for ne,sep=1−3×1019m−3. This change in pedestal width was not supported by experimental data. A scan in the ratio of particle and energy transport in the pedestal (D/χ) was found to have a negligible effect on pe,ped. Qualitative agreement between JETTO-MISHKA-FRANTIC with EUROPED was found when the input density profiles are identical.http://www.sciencedirect.com/science/article/pii/S2352179123000042Pedestal stabilityPressure pedestalCore edge integrationEPEDJINTRAC |
| spellingShingle | J. Simpson D. Moulton C. Giroud M. Groth L. Horvath F.J. Casson F. Kochl L. Frassinetti G. Corrigan S. Saarelma L. Garzotti D.S. Gahle A. Chankin Investigation of the dependence of pe,ped on ne,sep in JET H-Mode plasmas using integrated JETTO-MISHKA-FRANTIC simulations Nuclear Materials and Energy Pedestal stability Pressure pedestal Core edge integration EPED JINTRAC |
| title | Investigation of the dependence of pe,ped on ne,sep in JET H-Mode plasmas using integrated JETTO-MISHKA-FRANTIC simulations |
| title_full | Investigation of the dependence of pe,ped on ne,sep in JET H-Mode plasmas using integrated JETTO-MISHKA-FRANTIC simulations |
| title_fullStr | Investigation of the dependence of pe,ped on ne,sep in JET H-Mode plasmas using integrated JETTO-MISHKA-FRANTIC simulations |
| title_full_unstemmed | Investigation of the dependence of pe,ped on ne,sep in JET H-Mode plasmas using integrated JETTO-MISHKA-FRANTIC simulations |
| title_short | Investigation of the dependence of pe,ped on ne,sep in JET H-Mode plasmas using integrated JETTO-MISHKA-FRANTIC simulations |
| title_sort | investigation of the dependence of pe ped on ne sep in jet h mode plasmas using integrated jetto mishka frantic simulations |
| topic | Pedestal stability Pressure pedestal Core edge integration EPED JINTRAC |
| url | http://www.sciencedirect.com/science/article/pii/S2352179123000042 |
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