Details

Autor(en) / Beteiligte

• Field, A R
• Aleiferis, S
• Belonohy, É
• Carvalho, P
• Coffey, I
• Frigione, D
• Garzotti, L
• Horvath, L
• Kim, Hyun-Tae
• Lennholm, M
• Lerche, E
• Lomas, P
• Lowry, C G
• Mailloux, J
• Rimini, F
• Roach, C M
• Sertoli, M
• Štancar, Ž
• Szepesi, G
• van Eester, D

Titel

The impact of fuelling and W radiation on the performance of high-power, ITER-baseline scenario plasmas in JET-ILW

Ist Teil von

• Plasma physics and controlled fusion, 2021-09, Vol.63 (9), p.95013

Ort / Verlag

IOP Publishing

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Abstract Sustained operation of high-performance, ITER-baseline scenario plasmas at the high levels of input power ( ≲ 40 MW ) required to achieve ∼15 MW of D-T fusion power in JET-ILW requires careful optimisation of the fuelling to avoid an unacceptable disruption rate due to excessive radiation, primarily from W impurities, which are sputtered by edge-localised modes (ELMs) from the divertor targets. By using a train of ELM-pacing pellets from a high-frequency pellet injector to promote regular ELMs, which flush W and other impurities from the confined plasma, such high-performance plasmas can be sustained (for ∼5 s) while maintaining a high normalised confinement factor H 98, y 2  ∼ 1, which would otherwise be degraded by reducing the pedestal confinement if a higher rate of D 2 gas fuelling were used instead of the pellets to mitigate the W contamination. The causes underlying the improved performance and energy confinement obtained using this combined, gas and pellet fuelling scheme is investigated here in some detail.