Ion Cyclotron Emission — a Natural Diagnostic for Fusion Alpha Particles

Dendy, R. O.; Lashmore-Davies, C. N.; Cottrell, Geoff; McClements, K. G.; Kam, K F

doi:10.13182/fst94-a30290

Cited by 7 publications

(5 citation statements)

References 10 publications

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“…Here we give an overview of the possibility of using ICE to diagnose alpha particles in BP experiments, as was proposed in [341,484]. This idea is based on the correlation of the ICE intensity, P ICE , and the total neutron emission rate.…”

Section: Ice For Ep Diagnosticsmentioning

confidence: 99%

Energetic particle physics in fusion research in preparation for burning plasma experiments

2014

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The area of energetic particle (EP) physics in fusion research has been actively and extensively researched in recent decades. The progress achieved in advancing and understanding EP physics has been substantial since the last comprehensive review on this topic by Heidbrink and Sadler (1994 Nucl. Fusion 34 535). That review coincided with the start of deuterium-tritium (DT) experiments on the Tokamak Fusion Test Reactor (TFTR) and full scale fusion alphas physics studies. Fusion research in recent years has been influenced by EP physics in many ways including the limitations imposed by the 'sea' of Alfvén eigenmodes (AEs), in particular by the toroidicity-induced AE (TAE) modes and reversed shear AEs (RSAEs). In the present paper we attempt a broad review of the progress that has been made in EP physics in tokamaks and spherical tori since the first DT experiments on TFTR and JET (Joint European Torus), including stellarator/helical devices. Introductory discussions on the basic ingredients of EP physics, i.e., particle orbits in STs, fundamental diagnostic techniques of EPs and instabilities, wave particle resonances and others, are given to help understanding of the advanced topics of EP physics. At the end we cover important and interesting physics issues related to the burning plasma experiments such as ITER (International Thermonuclear Experimental Reactor).

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Section: Ice For Ep Diagnosticsmentioning

confidence: 99%

Energetic particle physics in fusion research in preparation for burning plasma experiments

2014

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“…The EP/wave interactions were considered with realistic drift ion motion in the presence of CA waves [10] (see also recent publications on those interactions in [11,12]). Nevertheless, this simplified homogeneous plasma limit allowed one to make the case for ICE diagnostic applications in ITER burning plasmas [6,13] (see also recent review with the summary and current understanding of ICE [3]). …”

Section: Waves and Instabilities In Plasmamentioning

confidence: 99%

“…We should say that a similar approach to CAE instabilities was developed in [42], where the slow instability limit was implied although no applications to ICE in experiments was made. Other papers dealing with ICE instabilities were limited to the strong instability as discussed above [20,21] (see also recent publications on those interactions in strong instability limit [11,12] and in earlier papers [10,13]). More recent formulations of CAE growth rates in applications to STs analyze the growth rate expressions accounting for EP drift frequency contributions which carefully address not only the cyclotron but EP drift frequencies [43,44].…”

Section: Ice Theorymentioning

confidence: 99%

“…its turn can be expressed via the perturbed distribution function: (13) where is the vector of the perpendicular particle velocity. Then, after some algebra, one arrives at (for more complete derivation we refer to [41]) (14) where we made use of the set of COM (constants of motion) variables, is the particle energy, is the toroidal canonical momentum, is the adiabatic moment, is the ion drift bounce frequency, is the equilibrium distribution function of the fast ions, and the functions account for the wave particle interactions [41], the set of frequencies in the denominator includes CAE eigenfrequency, cyclotron, drift and drift bounce frequencies.…”

Section: Ice Theorymentioning

confidence: 99%

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Ion cyclotron emission studies: Retrospects and prospects

Gorelenkov

2016

Plasma Phys. Rep.

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Ion cyclotron emission (ICE) studies emerged in part from the papers by A.B. Mikhailovskii published in the 1970s. Among the discussed subjects were electromagnetic compressional Alfvénic cyclotron instabilities with the linear growth rate driven by fusion products, -particles which draw a lot of attention to energetic particle physics. The theory of ICE excited by energetic particles was significantly advanced at the end of the 20th century motivated by first DT experiments on TFTR and subsequent JET experimental studies which we highlight. More recently ICE theory was advanced by detailed theoretical and experimental studies on spherical torus (ST) fusion devices where the instability signals previously indistinguishable in high aspect ratio tokamaks due to high toroidal magnetic field became the subjects of experiments. We discuss further prospects of ICE theory applications for future burning plasma (BP) experiments such as those to be conducted in ITER device in France, where neutron and gamma rays escaping the plasma create extremely challenging conditions fusion alpha particle diagnostics.

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“…ICE observation provides a method for studying and detecting fast ions in magnetic fusion reactors. If ICE's potential as a diagnostic of the fusion product population is to be realized, it will be important to understand the underlying emission physics mechanism and its parametric dependence [2,3].…”

Section: Introductionmentioning

confidence: 99%

Interpretation of ion cyclotron emission from sub-Alfvénic beam-injected ions heated plasmas soon after L-H mode transition in EAST

Liu,

Zhang,

Ochoukov

et al. 2023

Plasma Phys. Control. Fusion

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Ion cyclotron emission (ICE) at deuterium ion cyclotron harmonics, driven by sub-Alfvénic beam-injected deuterium ions, has been observed by the high-frequency B-dot probe in the EAST tokamak. The origin of ICE shifts from the plasma core to the plasma edge soon after an L-H mode transition, where the beam-injected deuterium ions have a relatively peak bump-on tail structure in the energy direction and a very intense pitch angle anisotropy. Based on the fast ion distribution function obtained from the TRANSP/NUBEAM code, together with a linear analysis theory of magnetoacoustic cyclotron instability (MCI), the growth rates of MCI could be calculated. It is shown that MCI, resulting in the generation of obliquely propagating fast Alfvén waves at deuterium ion cyclotron harmonics, can occur under such conditions. And the temporal evolution of the MCI growth rate closely follows that of the observed ICE amplitude in the EAST.

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Ion Cyclotron Emission — a Natural Diagnostic for Fusion Alpha Particles

Cited by 7 publications

References 10 publications

Energetic particle physics in fusion research in preparation for burning plasma experiments

Energetic particle physics in fusion research in preparation for burning plasma experiments

Ion cyclotron emission studies: Retrospects and prospects

Interpretation of ion cyclotron emission from sub-Alfvénic beam-injected ions heated plasmas soon after L-H mode transition in EAST

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