This paper summarizes the physical principles behind the novel three-ion scenarios using radio frequency waves in the ion cyclotron range of frequencies (ICRF). We discuss how to transform mode conversion electron heating into a new flexible ICRF technique for ion cyclotron heating and fast-ion generation in multi-ion species plasmas. The theoretical section provides practical recipes for selecting the plasma composition to realize three-ion ICRF scenarios, including two equivalent possibilities for the choice of resonant absorbers that have been identified. The theoretical findings have been convincingly confirmed by the proof-of-principle experiments in mixed H-D plasmas on the Alcator C-Mod and JET tokamaks, using thermal He-3 and fast D ions from neutral beam injection as resonant absorbers. Since 2018, significant progress has been made on the ASDEX Upgrade and JET tokamaks in H-He-4 and H-D plasmas, guided by the ITER needs. Furthermore, the scenario was also successfully applied in JET D-He-3 plasmas as a technique to generate fusion-born alpha particles and study effects of fast ions on plasma confinement under ITER-relevant plasma heating conditions. Tuned for the central deposition of ICRF power in a small region in the plasma core of large devices such as JET, three-ion ICRF scenarios are efficient in generating large populations of passing fast ions and modifying the q-profile. Recent experimental and modeling developments have expanded the use of three-ion scenarios from dedicated ICRF studies to a flexible tool with a broad range of different applications in fusion research.

Kazakov, Y., Ongena, J., Wright, J., Wukitch, S., Bobkov, V., Garcia, J., et al. (2021). Physics and applications of three-ion ICRF scenarios for fusion research. PHYSICS OF PLASMAS, 28(2) [10.1063/5.0021818].

Physics and applications of three-ion ICRF scenarios for fusion research

Nocente M.;Giacomelli L.;Rigamonti D.;
2021

Abstract

This paper summarizes the physical principles behind the novel three-ion scenarios using radio frequency waves in the ion cyclotron range of frequencies (ICRF). We discuss how to transform mode conversion electron heating into a new flexible ICRF technique for ion cyclotron heating and fast-ion generation in multi-ion species plasmas. The theoretical section provides practical recipes for selecting the plasma composition to realize three-ion ICRF scenarios, including two equivalent possibilities for the choice of resonant absorbers that have been identified. The theoretical findings have been convincingly confirmed by the proof-of-principle experiments in mixed H-D plasmas on the Alcator C-Mod and JET tokamaks, using thermal He-3 and fast D ions from neutral beam injection as resonant absorbers. Since 2018, significant progress has been made on the ASDEX Upgrade and JET tokamaks in H-He-4 and H-D plasmas, guided by the ITER needs. Furthermore, the scenario was also successfully applied in JET D-He-3 plasmas as a technique to generate fusion-born alpha particles and study effects of fast ions on plasma confinement under ITER-relevant plasma heating conditions. Tuned for the central deposition of ICRF power in a small region in the plasma core of large devices such as JET, three-ion ICRF scenarios are efficient in generating large populations of passing fast ions and modifying the q-profile. Recent experimental and modeling developments have expanded the use of three-ion scenarios from dedicated ICRF studies to a flexible tool with a broad range of different applications in fusion research.
Articolo in rivista - Articolo scientifico
ICRH heating, fusion plasmas
English
2021
28
2
020501
none
Kazakov, Y., Ongena, J., Wright, J., Wukitch, S., Bobkov, V., Garcia, J., et al. (2021). Physics and applications of three-ion ICRF scenarios for fusion research. PHYSICS OF PLASMAS, 28(2) [10.1063/5.0021818].
File in questo prodotto:
File Dimensione Formato  
10281-413654_VoR.pdf

accesso aperto

Tipologia di allegato: Publisher’s Version (Version of Record, VoR)
Licenza: Creative Commons
Dimensione 8.33 MB
Formato Adobe PDF
8.33 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/413654
Citazioni
  • Scopus 48
  • ???jsp.display-item.citation.isi??? 45
Social impact