Advanced neutral alkali beam diagnostics for applications in fusion research (invited)

W7-X Team

Publikation: Beitrag in einer FachzeitschriftReview eines Fachbereichs (Review article)ForschungBegutachtung

Abstract

Diagnosing the density profile at the edge of high temperature fusion plasmas by an accelerated lithium beam is a known technique since decades. By knowledge of the relevant atomic physics rate coefficients, the plasma electron density profile can be calculated from the relatively calibrated light profile along the beam. Several additional possibilities have already been demonstrated: Charge Exchange Resonance Spectroscopy (CXRS) for ion temperature/flow and Zeeman polarimetry for edge plasma current; therefore the Li-beam diagnostic offers a wealth of information at the plasma edge. The weaknesses of the method are the relatively faint light signal, background light, and technical difficulties of the beam injector which usually seriously limit the applicability. In this talk, we present systematic developments in alkali-beam diagnostics (Li, Na) for the injector and the observation system and detectors which resulted in strongly increased capabilities. Advanced systems have been built, and microsecond scale density profile, turbulence, and zonal flow measurement have been demonstrated. A novel edge current measurement technique has also been designed, and components have been tested with potential microsecond-scale time resolution. Additional possibilities of these advanced systems for spectral measurements (CXRS and various Zeeman schemes) are also discussed.

Originalspracheenglisch
Aufsatznummer10D107
FachzeitschriftReview of scientific instruments
Jahrgang89
Ausgabenummer10
DOIs
PublikationsstatusVeröffentlicht - 1 Okt 2018

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alkalies
Fusion reactions
fusion
resonance charge exchange
Plasmas
injectors
profiles
Atomic physics
Spectroscopy
Plasma diagnostics
Polarimeters
electron density profiles
atomic physics
flow measurement
plasma currents
polarimetry
Electric current measurement
Flow measurement
ion temperature
spectroscopy

ASJC Scopus subject areas

  • !!Instrumentation

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Advanced neutral alkali beam diagnostics for applications in fusion research (invited). / W7-X Team.

in: Review of scientific instruments, Jahrgang 89, Nr. 10, 10D107, 01.10.2018.

Publikation: Beitrag in einer FachzeitschriftReview eines Fachbereichs (Review article)ForschungBegutachtung

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abstract = "Diagnosing the density profile at the edge of high temperature fusion plasmas by an accelerated lithium beam is a known technique since decades. By knowledge of the relevant atomic physics rate coefficients, the plasma electron density profile can be calculated from the relatively calibrated light profile along the beam. Several additional possibilities have already been demonstrated: Charge Exchange Resonance Spectroscopy (CXRS) for ion temperature/flow and Zeeman polarimetry for edge plasma current; therefore the Li-beam diagnostic offers a wealth of information at the plasma edge. The weaknesses of the method are the relatively faint light signal, background light, and technical difficulties of the beam injector which usually seriously limit the applicability. In this talk, we present systematic developments in alkali-beam diagnostics (Li, Na) for the injector and the observation system and detectors which resulted in strongly increased capabilities. Advanced systems have been built, and microsecond scale density profile, turbulence, and zonal flow measurement have been demonstrated. A novel edge current measurement technique has also been designed, and components have been tested with potential microsecond-scale time resolution. Additional possibilities of these advanced systems for spectral measurements (CXRS and various Zeeman schemes) are also discussed.",
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AU - W7-X Team

AU - Zoletnik, S.

AU - Anda, G.

AU - Aradi, M.

AU - Asztalos, O.

AU - Bató, S.

AU - Bencze, A.

AU - Berta, M.

AU - Demeter, G.

AU - Dunai, D.

AU - Hacek, P.

AU - Hegedűs, S.

AU - Hu, G. H.

AU - Krizsanóczi, T.

AU - Lampert, M.

AU - Nagy, D.

AU - Németh, J.

AU - Otte, M.

AU - Petravich, G.

AU - Pokol, G. I.

AU - Réfy, D.

AU - Tál, B.

AU - Vécsei, M.

PY - 2018/10/1

Y1 - 2018/10/1

N2 - Diagnosing the density profile at the edge of high temperature fusion plasmas by an accelerated lithium beam is a known technique since decades. By knowledge of the relevant atomic physics rate coefficients, the plasma electron density profile can be calculated from the relatively calibrated light profile along the beam. Several additional possibilities have already been demonstrated: Charge Exchange Resonance Spectroscopy (CXRS) for ion temperature/flow and Zeeman polarimetry for edge plasma current; therefore the Li-beam diagnostic offers a wealth of information at the plasma edge. The weaknesses of the method are the relatively faint light signal, background light, and technical difficulties of the beam injector which usually seriously limit the applicability. In this talk, we present systematic developments in alkali-beam diagnostics (Li, Na) for the injector and the observation system and detectors which resulted in strongly increased capabilities. Advanced systems have been built, and microsecond scale density profile, turbulence, and zonal flow measurement have been demonstrated. A novel edge current measurement technique has also been designed, and components have been tested with potential microsecond-scale time resolution. Additional possibilities of these advanced systems for spectral measurements (CXRS and various Zeeman schemes) are also discussed.

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