Recent progress in ICRF physics

Porkoláb, M.; Bécoulet, A.; Bonoli, P.; Gormezano, C.; Koch, R.; Majeski, R.; Messiaen, A.; Noterdaeme, Jean-Marie; Petty, C. C.; Pinsker, R. I.; Start, D.; Wilson, Robert R.

doi:10.1088/0741-3335/40/8a/004

Cited by 41 publications

(51 citation statements)

References 26 publications

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“…Since three-ion scenarios allow minimizing the number of resonant particles down to ‰ levels, rather high-energy ions can be generated. An independent confirmation of accelerating 3 He ions to high energies is provided by gamma-ray emission spectroscopy on JET 21,22 . Figure 3a displays the gamma-ray advantage of increasing the absorbed RF power per ion.…”

Section: Efficient Generation Of High-energy Ionsmentioning

confidence: 99%

“…b, 'Threeion' scenarios require resonant ions with a (Z/A) ratio in between that of the two main ions, essentially following the 'sandwich' principle (Z/A) 2 < (Z/A) 3 < (Z/A) 1 . The figure shows the fraction of RF power absorbed by 3 There is, however, an elegant way to use mixture plasmas to channel RF power to ions: simply add a third ion species with a cyclotron resonance layer close to the IIH cutoff-resonance pair. Under these conditions, a new IIH pair appears in close proximity to the cyclotron resonance of the third ion species, even if their concentration is extremely low!…”

Section: Figure 1 | a New Technique For Fast-ion Generation In Magnetmentioning

confidence: 99%

“…For proof-of-principle demonstration, we select a plasma mixture composed of two hydrogen isotopes, H ions with (Z/A)=1 and the heavier D ions with (Z/A)=1/2, and 3 He ions with their unique (Z/A)=2/3 as a resonant absorber. Equation (2) predicts that 3 He ions should efficiently absorb RF power in H-D or H- 4 He plasmas, if the hydrogen concentration is ~ 67%. This is supported by modeling with the TOMCAT code 11 , using plasma parameters relevant for the JET experiments described below.…”

Section: Figure 1 | a New Technique For Fast-ion Generation In Magnetmentioning

confidence: 99%

“…Ion cyclotron resonance heating (ICRH) is a powerful tool used in toroidal magnetic fusion research. In recent decades, several efficient ICRH scenarios were identified theoretically and verified experimentally [2][3][4] .…”

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confidence: 99%

“…A variety of strong wave-particle interactions is possible when the wave frequency is close to the particle's cyclotron frequency or its harmonics [1][2][3] . Ion cyclotron resonance heating (ICRH) is a powerful tool used in toroidal magnetic fusion research.…”

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confidence: 99%

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Efficient generation of energetic ions in multi-ion plasmas by radio-frequency heating

Kazakov¹,

Ongena²,

Wright

et al. 2017

Nature Phys

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We describe a new technique for efficient generation of high-energy ions with electromagnetic ion cyclotron waves in multi-ion plasmas. The discussed 'three-ion' scenarios are especially suited for strong wave absorption by a very low number of resonant ions. To observe this effect, the plasma composition has to be properly adjusted, as prescribed by theory. We demonstrate the potential of this technique on the world-largest plasma magnetic confinement device JET (Joint European Torus, Culham, UK) and the high magnetic field tokamak Alcator C-Mod (MIT, USA). The obtained results demonstrate efficient acceleration of 3 He ions to high energies in dedicated hydrogen-deuterium mixtures. Simultaneously, effective plasma heating is observed, as a result of the slowing-down of the fast 3 He ions. The developed technique is not only limited to laboratory plasmas, but can also be applied to explain observations of energetic ions in space plasma environments, in particular, 3 He-rich solar flares.Accepted version of the paper published in Nature Physics (2017) http://dx

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Section: Efficient Generation Of High-energy Ionsmentioning

confidence: 99%

Section: Figure 1 | a New Technique For Fast-ion Generation In Magnetmentioning

confidence: 99%

Section: Figure 1 | a New Technique For Fast-ion Generation In Magnetmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Efficient generation of energetic ions in multi-ion plasmas by radio-frequency heating

Kazakov¹,

Ongena²,

Wright

et al. 2017

Nature Phys

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Numerical modeling of the coupling of an ICRH antenna with a plasma with self-consistent antenna currents

Pécoul

Heuraux

Koch

et al. 2002

Computer Physics Communications

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Synergetic heating of D-NBI ions in the vicinity of the mode conversion layer in H-D plasmas in JET with the ITER like wall.

Ongena¹,

Kazakov²,

Baranov

et al. 2017

EPJ Web Conf.

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Abstract. This paper discusses the extension of the 'three-ion' species ICRF technique for heating mixture plasmas using fast injected NBI ions as resonant 'third' species. In this scenario the ICRF power is absorbed by the fast beam ions in the vicinity of the mode conversion layer where the left-hand polarized RF electric field E + is strongly enhanced. The ions in the beam velocity distribution that have a Doppler-shifted resonance close to the mode conversion layer efficiently absorb RF power and undergo acceleration. We show first experimental observations of ICRF heating of D-NBI ions in H-D plasmas in JET with the ITER-like wall. In agreement with theoretical predictions and numerical modelling, acceleration of the D-NBI ions in this D-(D NBI )-H scenario is confirmed by several fast-ion measurements. An extension of the heating scheme discussed here is acceleration of T-NBI and D-NBI ions in D-T plasmas, offering the potential to further boost the Q-value in future D-T campaigns in JET.

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Recent progress in ICRF physics

Cited by 41 publications

References 26 publications

Efficient generation of energetic ions in multi-ion plasmas by radio-frequency heating

Efficient generation of energetic ions in multi-ion plasmas by radio-frequency heating

Numerical modeling of the coupling of an ICRH antenna with a plasma with self-consistent antenna currents

Synergetic heating of D-NBI ions in the vicinity of the mode conversion layer in H-D plasmas in JET with the ITER like wall.

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