Design Features of the Neutral Particle Diagnostic System for the ITER Tokamak

Petrov, S. Ya.; Afanasyev, V. I.; Mel'nik, A.D.; Mironov, M. I.; Navolotsky, A. S.; Несеневич, В. Г.; Петров, М. П.; Чернышев, Ф. В.; Kedrov, I. V.; Kuzmin, E. G.; Lyublin, B. V.; Kozlovski, S.S.; Mokeev, A.N.

doi:10.1134/s1063778817070109

Cited by 13 publications

(3 citation statements)

References 7 publications

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“…H 2 gas is used as the stripping gas to avoid polluting the Tokamak fuel. It is filled in the stripping room from the top flange (5) of the vacuum chamber through a bellow (4). A machinery bearing molecular pump with a pumping speed of 340 L/s is used at the bottom of vacuum chamber together with a gate valve (11) in this work.…”

Section: Design and Pressure Calculation Of The Gas Stripping Chambermentioning

confidence: 99%

“…It is used to determine the bulk ion temperature, the isotopic ratio and the fast ion distribution of the plasma, by measuring the charge exchange neutral particles escaping from the plasma. Different types of NPA have been built in Tokamak facilities worldwide [2][3][4][5][6][7][8][9][10][11][12][13], such as the parallel direction of electric and magnetic fields (E//B) NPA on the Tokamak Fusion Test Reactor (TFTR) [2], the compact neutral particle analyzer (CNPA) on the Wendelstein 7-AS stellarator [3], the low-and high-energy neutral particle analyzers (LENPA and HENPA) on the International Thermonuclear Experimental Reactor (ITER) [10], the solid state NPA (ss-NPA) on the Experimental Advanced Superconducting Tokamak (EAST) [11] and the CP-NPA on the HuanLiuqi-2A (HL-2A) [12].…”

Section: Introductionmentioning

confidence: 99%

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A simulation study of a windowless gas stripping room in an E//B neutral particle analyzer

Luo

Lin

Ren

et al. 2021

Preprint

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Neutral Particle Analyzer (NPA) is one of the crucial diagnostic devices on Tokamak facilities. Stripping unit is one of the main parts of the NPA. A windowless gas stripping room with two differential pipes is adopted in a parallel direction of electric and magnetic fields (E//B) NPA. The pressure distributions in the stripping chamber are simulated by Ansys Fluent together with MolFlow+. Based on the pressure distributions extracted from the simulation, the stripping efficiency of the E//B NPA is studied with GEANT4. The hadron reaction physics is modified to track the charge state of each particle in a cross section base method in GEANT4. The transmission rates (R) and the stripping efficiencies f+1 are examined for the particle energy ranging from 20 to 200 keV at the input pressure (P0) ranging from 20 to 400 Pa. According to the combined global efficiency, R × f+1, P0 = 240 Pa is obtained as the optimum pressure for the maximum global efficiency in the incident energy range investigated.

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Section: Design and Pressure Calculation Of The Gas Stripping Chambermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A simulation study of a windowless gas stripping room in an E//B neutral particle analyzer

Luo

Lin

Ren

et al. 2021

Preprint

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“…A lot of effort has been made in integrating LENPA and HENPA analyzers with their supporting subsystems into the ITER environment. At present, the tests of the most critical NPA components are underway [59], and the problems related to NPA neutron and magnetic shield design are being resolved [60]. One of the main goals for the analyzers at ITER is the measurement of the fuel isotope (D/T) ratio [61].…”

Section: 1npa and Grsmentioning

confidence: 99%

Tokamak research at the Ioffe Institute

et al. 2019

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Recent research at three small tokamaks with different parameters located at the Ioffe Institute-the spherical tokamak Globus-M, the large aspect ratio tokamak FT-2 and the compact tokamak TUMAN-3M-are reviewed. This overview covers energy confinement (Globus-M and FT-2), L-H transition (TUMAN-3M and FT-2), Alfvén waves (Globus-M and TUMAN-3M), ion cyclotron emission (TUMAN-3M), major plasma discharge disruption (Globus-M) and scrape-off layer (Globus-M) studies. A full-f global gyrokinetic modeling benchmark using synthetic diagnostics in FT-2 is described. Anomalous absorption and emission in electron cyclotron resonance heating experiments due to the parametric excitation of localized upper hybrid waves are analyzed theoretically. Progress in the development of the neutral particle analysis, gamma-ray spectrometry and divertor Thomson scattering combined with laser-induced fluorescence diagnostics for ITER is discussed. The status of the new Globus-M2 spherical tokamak is reported.

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