Sawtooth mixing of alphas, knock-on D, and T ions, and its influence on NPA spectra in ITER plasma

Mironov, M. I.; Zaitsev, F. S.; Gorelenkov, N. N.; Afanasyev, V. I.; Chernyshev, F. V.; Nesenevich, V. G.; Petrov, M. P.

doi:10.1088/1741-4326/aab678

Sawtooth mixing of alphas, knock-on D, and T ions, and its influence on NPA spectra in ITER plasma

Journal Article · Wed Mar 14 00:00:00 EDT 2018 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aab678· OSTI ID:1465685

Mironov, M. I. ^[1]; Zaitsev, F. S. ^[2]; Gorelenkov, N. N. ^[3]; Afanasyev, V. I. ^[1]; Chernyshev, F. V. ^[1]; Nesenevich, V. G. ^[1]; Petrov, M. P. ^[1]

Ioffe Inst., St. Petersburg (Russian Federation)
Russian Academy of Sciences (RAS), Moscow (Russian Federation). Scientific Research Inst. of System Development; Moscow State Univ., Moscow (Russian Federation). Dept. of Computational Mathematics and Cybernetics
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sawtooth mixing of fast ions is considered in ITER for plasma parameters close to the inductive 15 MA scenario. In this paper, new mixing formula is presented for a drift trajectory averaged distribution function (DF) of fast passing and trapped ions. This formula generalizes Kadomtsev's model for the case of non-circular magnetic surfaces, arbitrary aspect ratio, and significant deviations of charged particle drift trajectories from the magnetic flux surfaces, and can be applicable to a wide class of instabilities. Generalized formulae are implemented in the Fokker–Planck package three-dimensional (FPP-3D) code. FPP-3D is applied for calculation of the fast alpha-particle (He⁴), deuterium (D), and tritium (T) DFs. Simulations take into account D and T nuclear elastic scattering (NES or knock-on) by fast He⁴. Changes in the radial profile of He⁴ power deposition to the thermal plasma in the presence of plasma mixing are estimated. An effective tool for fast ion studies in ITER will be a system of neutral particle analyzers (NPA) since it allows direct measurements of the fast hydrogen ions' DF inside the plasma. The main NPA goal on ITER is to measure the D/T fuel isotope ratio in the plasma core with the use of D and T atom spectra in the MeV range. The spectra and their sensitivity to sawtooth mixing are calculated. It was found that ITER NPA allows us to detect those oscillations. Finally, simulations show the possibility of determining the D/T ratio with NPA regardless of whether sawtooth oscillations exist.

Research Organization:: Ioffe Inst., St. Petersburg (Russian Federation); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Russian Academy of Sciences (RAS), Moscow (Russian Federation)

Sponsoring Organization:: Russian Academy of Sciences (RAS); USDOE

OSTI ID:: 1465685

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 8 Vol. 58; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Role of Hall effect on the resistive kink mode in tokamaks Zhang, W.; Ma, Z. W.; Zhang, H. W. Plasma Physics and Controlled Fusion, Vol. 62, Issue 2 https://doi.org/10.1088/1361-6587/ab60ff	journal	January 2020
Effect of sawtooth crashes on fast ion distribution in NSTX-U Liu, D.; Heidbrink, W. W.; Podestà, M. Nuclear Fusion, Vol. 58, Issue 8 https://doi.org/10.1088/1741-4326/aac64f	journal	July 2018
Tokamak research at the Ioffe Institute Bakharev, N. N.; Abdullina, G. I.; Afanasyev, V. I. Nuclear Fusion, Vol. 59, Issue 11 https://doi.org/10.1088/1741-4326/ab22dc	journal	August 2019

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