Pedestal particle balance studies in JET-ILW H-mode plasmas

Horvath, L.; Lomanowski, B.; Karhunen, J.; Maslov, M.; Schneider, P. A.; Simpson, J.; Brix, M.; Chapman-Oplopoiou, B.; Corrigan, G.; Frassinetti, L.; Groth, M.; Lawson, K.; Maggi, C. F.; Menmuir, S.; Morales, R. B.; Moulton, D.; Myatra, O.; Nina, D.; Pereira, T.; Réfy, D. I.; Saarelma, S.; Vécsei, M.

doi:10.1088/1361-6587/acbb23

Title: Pedestal particle balance studies in JET-ILW H-mode plasmas

Journal Article · Fri Mar 03 00:00:00 EST 2023 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/acbb23· OSTI ID:1986204

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Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE); VTT Technical Research Centre (Finland)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
Max Planck Society, Garching (Germany). Max Planck Institute for Plasma Physics
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE); Aalto Univ. (Finland)
KTH Royal Inst. of Technology, Stockholm (Sweden)
Aalto Univ. (Finland)
Univ. of Lisbon (Portugal)
Center for Energy Research, Budapest (Hungary)

JET-ILW type I ELMy H-modes at 2.5 MA/2.8 T with constant NBI heating (23 MW) and gas fuelling rate were performed, utilising edge localised mode (ELM) pacing by vertical kicks and plasma shaping (triangularity, δ) as tools to disentangle the effects of ELMs, inter-ELM transport and edge stability on the pedestal particle balance. In agreement with previous studies, the pedestal confinement improves with increasing δ, mostly due to a significant increase in pedestal density while the ELM frequency ($$f_{\mathrm{ELM}}$$) is decreased. Improved pedestal confinement with increasing δ was observed even when the pedestal MHD stability was degraded artificially by vertical kicks, implying that increased triangularity may favourably affect the inter-ELM pedestal recovery. The workflow developed to quantify the pedestal particle balance uses high time-resolution profile reflectometry to characterise the inter-ELM evolution of the plasma particle content ($$\mathrm{d} N/\mathrm{d}t$$), the NEO drift-kinetic solver to evaluate the neoclassical fluxes and interpretative EDGE2D-EIRENE simulations to estimate the edge particle source. The edge particle source is then constrained by deuterium Balmer-α line intensity measurements in the main chamber, which are, however, strongly affected by reflections from the metal walls. The reflections are accounted for by the CHERAB code taking the divertor emission (the brightest light source in the torus) distribution from imaging spectroscopy measurements as input. Our analysis shows that in the second half of the ELM cycle, the volume-integrated particle source is larger than $$\mathrm{d} N/\mathrm{d}t$$, indicating that transport plays a key role in the inter-ELM pedestal recovery.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: JET Contributors

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1986204

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 65, Issue 4; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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