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

W7-X Team

Research output: Contribution to journalReview article

4 Citations (Scopus)

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.

Original languageEnglish
Article number10D107
JournalReview of Scientific Instruments
Volume89
Issue number10
DOIs
Publication statusPublished - Oct 1 2018

Fingerprint

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

Cite this

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

In: Review of Scientific Instruments, Vol. 89, No. 10, 10D107, 01.10.2018.

Research output: Contribution to journalReview article

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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.

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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.

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