Charge exchange spectroscopy as a fast ion diagnostic on TEXTOR

E. Delabie; R.J.E. Jaspers; M.G. von Hellermann; Stefan Kragh Nielsen; O. Marchuk

doi:10.1063/1.2955575

Charge exchange spectroscopy as a fast ion diagnostic on TEXTOR

E. Delabie, R.J.E. Jaspers, M.G. von Hellermann, Stefan Kragh Nielsen, O. Marchuk

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Abstract

An upgraded charge exchange spectroscopy diagnostic has been taken into operation at the TEXTOR tokamak. The angles of the viewing lines with the toroidal magnetic field are close to the pitch angles at birth of fast ions injected by one of the neutral beam injectors. Using another neutral beam for active spectroscopy, injected counter the direction in which fast ions injected by the first beam are circulating, we can simultaneously measure a fast ion tail on the blue wing of the D-alpha spectrum while the beam emission spectrum is Doppler shifted to the red wing. An analysis combining the two parts of the spectrum offers possibilities to improve the accuracy of the absolute (fast) ion density profiles. Fast beam modulation or passive viewing lines cannot be used for background subtraction on this diagnostic setup and therefore the background has to be modeled and fitted to the data together with a spectral model for the slowing down feature. The analysis of the fast ion D-alpha spectrum obtained with the new diagnostic is discussed. ©2008 American Institute of Physics

Original language	English
Journal	Review of Scientific Instruments
Volume	79
Issue number	10
Pages (from-to)	10E522
ISSN	0034-6748
DOIs	https://doi.org/10.1063/1.2955575
Publication status	Published - 2008
Event	17. Topical Conference on High-Temperature Plasma Diagnostics - Albuquerque, NM, United States Duration: 11 May 2008 → 15 May 2008 Conference number: 17

Conference

Conference	17. Topical Conference on High-Temperature Plasma Diagnostics
Number	17
Country/Territory	United States
City	Albuquerque, NM
Period	11/05/2008 → 15/05/2008

Bibliographical note

Copyright (2008) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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title = "Charge exchange spectroscopy as a fast ion diagnostic on TEXTOR",

abstract = "An upgraded charge exchange spectroscopy diagnostic has been taken into operation at the TEXTOR tokamak. The angles of the viewing lines with the toroidal magnetic field are close to the pitch angles at birth of fast ions injected by one of the neutral beam injectors. Using another neutral beam for active spectroscopy, injected counter the direction in which fast ions injected by the first beam are circulating, we can simultaneously measure a fast ion tail on the blue wing of the D-alpha spectrum while the beam emission spectrum is Doppler shifted to the red wing. An analysis combining the two parts of the spectrum offers possibilities to improve the accuracy of the absolute (fast) ion density profiles. Fast beam modulation or passive viewing lines cannot be used for background subtraction on this diagnostic setup and therefore the background has to be modeled and fitted to the data together with a spectral model for the slowing down feature. The analysis of the fast ion D-alpha spectrum obtained with the new diagnostic is discussed. {\textcopyright}2008 American Institute of Physics",

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author = "E. Delabie and R.J.E. Jaspers and {von Hellermann}, M.G. and Nielsen, {Stefan Kragh} and O. Marchuk",

note = "Copyright (2008) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.; 17. Topical Conference on High-Temperature Plasma Diagnostics ; Conference date: 11-05-2008 Through 15-05-2008",

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AU - Delabie, E.

AU - Jaspers, R.J.E.

AU - von Hellermann, M.G.

AU - Nielsen, Stefan Kragh

AU - Marchuk, O.

N1 - Conference code: 17

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N2 - An upgraded charge exchange spectroscopy diagnostic has been taken into operation at the TEXTOR tokamak. The angles of the viewing lines with the toroidal magnetic field are close to the pitch angles at birth of fast ions injected by one of the neutral beam injectors. Using another neutral beam for active spectroscopy, injected counter the direction in which fast ions injected by the first beam are circulating, we can simultaneously measure a fast ion tail on the blue wing of the D-alpha spectrum while the beam emission spectrum is Doppler shifted to the red wing. An analysis combining the two parts of the spectrum offers possibilities to improve the accuracy of the absolute (fast) ion density profiles. Fast beam modulation or passive viewing lines cannot be used for background subtraction on this diagnostic setup and therefore the background has to be modeled and fitted to the data together with a spectral model for the slowing down feature. The analysis of the fast ion D-alpha spectrum obtained with the new diagnostic is discussed. ©2008 American Institute of Physics

AB - An upgraded charge exchange spectroscopy diagnostic has been taken into operation at the TEXTOR tokamak. The angles of the viewing lines with the toroidal magnetic field are close to the pitch angles at birth of fast ions injected by one of the neutral beam injectors. Using another neutral beam for active spectroscopy, injected counter the direction in which fast ions injected by the first beam are circulating, we can simultaneously measure a fast ion tail on the blue wing of the D-alpha spectrum while the beam emission spectrum is Doppler shifted to the red wing. An analysis combining the two parts of the spectrum offers possibilities to improve the accuracy of the absolute (fast) ion density profiles. Fast beam modulation or passive viewing lines cannot be used for background subtraction on this diagnostic setup and therefore the background has to be modeled and fitted to the data together with a spectral model for the slowing down feature. The analysis of the fast ion D-alpha spectrum obtained with the new diagnostic is discussed. ©2008 American Institute of Physics

KW - Energiteknologier på vej

U2 - 10.1063/1.2955575

DO - 10.1063/1.2955575

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SN - 0034-6748

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SP - 10E522

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 10

T2 - 17. Topical Conference on High-Temperature Plasma Diagnostics

Y2 - 11 May 2008 through 15 May 2008

ER -

Charge exchange spectroscopy as a fast ion diagnostic on TEXTOR

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