Integration of Thomson scattering and laser-induced fluorescence in ITER divertor

Mukhin, E. E.; Курскиев, Г. С.; Gorbunov, A. V.; Samsonov, Dmitry; Tolstyakov, S.Yu.; Razdobarin, A. G.; Babinov, N.A.; Баженов, А.Н.; Bukreev, I.M.; Dmitriev, A. M.; Elets, D.I.; Koval, A.; Litvinov, A.E.; Masyukevich, S. V.; Senitchenkov, V.A.; Solovei, V.A.; Tereschenko, Ivan; Varshavchik, L.A.; Kukushkin, A.S.; Khodunov, I.; Levashova, M.G.; Lisitsa, V. S.; Vukolov, K.Yu.; Berik, E.B.; Чернаков, П.В.; Chernakov, Al.P.; Chernakov, An.P.; Zatilkin, P.A.; Zhiltsov, Nikita; Krivoruchko, Dariya; Skrylev, A. V.; Mokeev, A.N.; Andrew, P.; Kempenaars, M.; Vayakis, G.; Walsh, M.

doi:10.1088/1741-4326/ab1cd5

Cited by 19 publications

(14 citation statements)

References 15 publications

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“…It was verified in Globus-M experiments, showing a good agreement between TS and LIF for T e ~ 110 eV n e ~ 2 × 10 19 m −3 [75]. Laser-induced quenching is a new technique [75], proposed for the measurement of H/D/T atomic density in the ITER divertor. The current status of LIF performance of T i and n He measurements using HeI and HeII fluorescence was presented in [76].…”

Section: 2dts Combined With Lifmentioning

confidence: 83%

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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Section: 2dts Combined With Lifmentioning

confidence: 83%

Tokamak research at the Ioffe Institute

et al. 2019

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“…Конденсируемые на зеркале пленки Ве приведут к уменьшению его отражательной способности. В работе [5] рассматривается возможность защиты " первых" зеркал ДТР-окнами -тонкими пластинами кварца или лейкосапфира [6], отделяющими всю вакуумную оптику от воздействия потоков частиц ядерного топлива и частиц распыляемого материала первой стенки.…”

Section: введение и постановка задачиunclassified

Структура Поверхностного Слоя И Пропускание Света Сапфиром После Распыления В ВЧ Разряде В Смеси H-=sub=-2-=/Sub=--N-=sub=-2-=/Sub=-

Городецкий¹,

Снигирев²,

Маркин³

et al. 2022

Журнал Технической Физики

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Leucosapphire (c-LS) structure and transmission in visible after surface treatment in 90%H2-10%N2 RF discharge are studied. According to AFM, the number of scratches of the mechanically polished surface decreased significantly after removal of about a 300 nm layer (exposure time of 12 h) under unchanged rms of roughness. According to TEM, a two-layer structure formed in the near-surface region consists of an outer 10 nm amorphous layer followed by a crystalline layer of 40–50 nm with a high defect density. The c-LS transmission in the angle of 400–1000 nm either slightly increased or remained unchanged. The demonstrated transmission stability during exposure in 90%H2-10%N2 RF discharge allows us to consider the plasma sputtering as a promising technique for cleaning contaminated windows protecting first mirror of divertor Thomson scattering being developed for ITER divertor.

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“…This is due to several reasons: 1) the divertor region is considerably recessed with respect to the machine diagnostic ports and the physical constraints of the divertor mechanical components makes difficult to have an efficient optical access; 2) in the divertor region there is a considerable level of background light, due to the high level of plasma radiation (continuum and impurity lines) and also to blackbody radiation from heated divertor components; both produce a background light pedestal superimposed to TS signals whose fluctuations may considerably limit the accuracy of TS measurements; 3) as shown in other experiments, in some cases the T e and n e values in the divertor plasma are such that the conditions of incoherent TS are not fulfilled. This makes difficult both to reliably measure and interpret the TS spectra [4].…”

Section: Jinst 15 C01042mentioning

confidence: 99%

“…This expression indicates that in the divertor plasma there may be regions with low T e and high n e where the assumption of incoherent scattering is no longer valid. In this case the interpretation of the scattering spectrum in terms of T e and n e is more complicated [4]. This scattering regime is not considered here and the validity of the above condition should be verified as soon as detailed information on the expected values of T e and n e in the divertor region will be available.…”

Section: Jinst 15 C01042mentioning

confidence: 99%

Design of Thomson scattering diagnostics for the Divertor Tokamak Test (DTT) facility

Giudicotti¹,

Fassina²,

Pasqualotto³

et al. 2020

J. Inst.

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In the Divertor Tokamak Test (DTT) facility two Thomson scattering (TS) systems are under design for the measurements of T e and n e in the core plasma region and in the divertor respectively. The divertor TS system under study is a conventional TS system based on a Nd:YAG laser source, a fiber optic based light collection system and a set of filter polychromators equipped with Si APD detectors. The laser beam and the collection optics share an aperture between adjacent cassettes of the lower divertor and the scattering signal is collected from a set of scattering volumes close to one of the divertor legs by a collection optics system located under the divertor dome and is carried to the polychromators by fiber optic bundles. The filter polychromators are designed to measure T e as low as 1 eV. Measurements with a spatial resolution of 10 mm are possible, with accuracy limited by the plasma n e and the background light. For the core TS system, two options are under consideration: a conventional system, similar to that designed for the ITER core TS, in which T e and n e are measured along a large fraction of a laser beam crossing the plasma near the equatorial plane and the detection system is again based on fiber optic coupled filter polychromators. The spatial resolution is 5 cm in the central region and 1 cm at the plasma edge. Alternatively a TS system based on the LIDAR concept, previously implemented in JET, is under consideration. Recent advancements in laser and detector technology allow achieving a spatial resolution similar to that of a conventional system, but with a simpler and reliable experimental set-up and possibly at a lower cost. K: Plasma diagnostics -interferometry, spectroscopy and imaging; Nuclear instruments and methods for hot plasma diagnostics 1Corresponding author.

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Integration of Thomson scattering and laser-induced fluorescence in ITER divertor

Cited by 19 publications

References 15 publications

Tokamak research at the Ioffe Institute

Tokamak research at the Ioffe Institute

Структура Поверхностного Слоя И Пропускание Света Сапфиром После Распыления В ВЧ Разряде В Смеси H-=sub=-2-=/Sub=--N-=sub=-2-=/Sub=-

Design of Thomson scattering diagnostics for the Divertor Tokamak Test (DTT) facility

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