Resolving the bulk ion region of millimeter-wave collective Thomson scattering spectra at ASDEX Upgrade

Morten Stejner Pedersen; Stefan Kragh Nielsen; Asger Schou Jacobsen; Søren Bang Korsholm; Frank Leipold; Fernando Meo; Poul Michelsen; Dmitry Moseev; Jesper Rasmussen; Mirko Salewski; M. Schubert; J. Stober; D. H. Wagner

doi:10.1063/1.4894199

Resolving the bulk ion region of millimeter-wave collective Thomson scattering spectra at ASDEX Upgrade

Morten Stejner Pedersen, Stefan Kragh Nielsen, Asger Schou Jacobsen, Søren Bang Korsholm, Frank Leipold, Fernando Meo, Poul Michelsen, Dmitry Moseev, Jesper Rasmussen, Mirko Salewski, M. Schubert, J. Stober, D. H. Wagner

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

Collective Thomson scattering (CTS) measurements provide information about the composition and velocity distribution of confined ion populations in fusion plasmas. The bulk ion part of the CTS spectrum is dominated by scattering off fluctuations driven by the motion of thermalized ion populations. It thus contains information about the ion temperature, rotation velocity, and plasma composition. To resolve the bulk ion region and access this information, we installed a fast acquisition system capable of sampling rates up to 12.5 GS/s in the CTS system at ASDEX Upgrade. CTS spectra with frequency resolution in the range of 1 MHz are then obtained through direct digitization and Fourier analysis of the CTS signal. We here describe the design, calibration, and operation of the fast receiver system and give examples of measured bulk ion CTS spectra showing the effects of changing ion temperature, rotation velocity, and plasma composition.

Original language	English
Journal	Review of Scientific Instruments
Volume	85
Issue number	9
Pages (from-to)	093504
Number of pages	12
ISSN	0034-6748
DOIs	https://doi.org/10.1063/1.4894199
Publication status	Published - 2014

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Stejner Pedersen, M., Nielsen, S. K., Jacobsen, A. S., Korsholm, S. B., Leipold, F., Meo, F., Michelsen, P., Moseev, D., Rasmussen, J., Salewski, M., Schubert, M., Stober, J., & Wagner, D. H. (2014). Resolving the bulk ion region of millimeter-wave collective Thomson scattering spectra at ASDEX Upgrade. Review of Scientific Instruments, 85(9), 093504. https://doi.org/10.1063/1.4894199

Stejner Pedersen, Morten ; Nielsen, Stefan Kragh ; Jacobsen, Asger Schou ; Korsholm, Søren Bang ; Leipold, Frank ; Meo, Fernando ; Michelsen, Poul ; Moseev, Dmitry ; Rasmussen, Jesper ; Salewski, Mirko ; Schubert, M. ; Stober, J. ; Wagner, D. H. / Resolving the bulk ion region of millimeter-wave collective Thomson scattering spectra at ASDEX Upgrade. In: Review of Scientific Instruments. 2014 ; Vol. 85, No. 9. pp. 093504.

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title = "Resolving the bulk ion region of millimeter-wave collective Thomson scattering spectra at ASDEX Upgrade",

abstract = "Collective Thomson scattering (CTS) measurements provide information about the composition and velocity distribution of confined ion populations in fusion plasmas. The bulk ion part of the CTS spectrum is dominated by scattering off fluctuations driven by the motion of thermalized ion populations. It thus contains information about the ion temperature, rotation velocity, and plasma composition. To resolve the bulk ion region and access this information, we installed a fast acquisition system capable of sampling rates up to 12.5 GS/s in the CTS system at ASDEX Upgrade. CTS spectra with frequency resolution in the range of 1 MHz are then obtained through direct digitization and Fourier analysis of the CTS signal. We here describe the design, calibration, and operation of the fast receiver system and give examples of measured bulk ion CTS spectra showing the effects of changing ion temperature, rotation velocity, and plasma composition.",

author = "{Stejner Pedersen}, Morten and Nielsen, {Stefan Kragh} and Jacobsen, {Asger Schou} and Korsholm, {S{\o}ren Bang} and Frank Leipold and Fernando Meo and Poul Michelsen and Dmitry Moseev and Jesper Rasmussen and Mirko Salewski and M. Schubert and J. Stober and Wagner, {D. H.}",

year = "2014",

doi = "10.1063/1.4894199",

language = "English",

volume = "85",

pages = "093504",

journal = "Review of Scientific Instruments",

issn = "0034-6748",

publisher = "American Institute of Physics",

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Stejner Pedersen, M, Nielsen, SK , Jacobsen, AS , Korsholm, SB, Leipold, F, Meo, F, Michelsen, P, Moseev, D, Rasmussen, J , Salewski, M, Schubert, M, Stober, J & Wagner, DH 2014, 'Resolving the bulk ion region of millimeter-wave collective Thomson scattering spectra at ASDEX Upgrade', Review of Scientific Instruments, vol. 85, no. 9, pp. 093504. https://doi.org/10.1063/1.4894199

Resolving the bulk ion region of millimeter-wave collective Thomson scattering spectra at ASDEX Upgrade. / Stejner Pedersen, Morten; Nielsen, Stefan Kragh ; Jacobsen, Asger Schou ; Korsholm, Søren Bang; Leipold, Frank; Meo, Fernando; Michelsen, Poul; Moseev, Dmitry; Rasmussen, Jesper ; Salewski, Mirko; Schubert, M.; Stober, J.; Wagner, D. H.

In: Review of Scientific Instruments, Vol. 85, No. 9, 2014, p. 093504.

Research output: Contribution to journal › Journal article › Research › peer-review

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T1 - Resolving the bulk ion region of millimeter-wave collective Thomson scattering spectra at ASDEX Upgrade

AU - Stejner Pedersen, Morten

AU - Nielsen, Stefan Kragh

AU - Jacobsen, Asger Schou

AU - Korsholm, Søren Bang

AU - Leipold, Frank

AU - Meo, Fernando

AU - Michelsen, Poul

AU - Moseev, Dmitry

AU - Rasmussen, Jesper

AU - Salewski, Mirko

AU - Schubert, M.

AU - Stober, J.

AU - Wagner, D. H.

PY - 2014

Y1 - 2014

N2 - Collective Thomson scattering (CTS) measurements provide information about the composition and velocity distribution of confined ion populations in fusion plasmas. The bulk ion part of the CTS spectrum is dominated by scattering off fluctuations driven by the motion of thermalized ion populations. It thus contains information about the ion temperature, rotation velocity, and plasma composition. To resolve the bulk ion region and access this information, we installed a fast acquisition system capable of sampling rates up to 12.5 GS/s in the CTS system at ASDEX Upgrade. CTS spectra with frequency resolution in the range of 1 MHz are then obtained through direct digitization and Fourier analysis of the CTS signal. We here describe the design, calibration, and operation of the fast receiver system and give examples of measured bulk ion CTS spectra showing the effects of changing ion temperature, rotation velocity, and plasma composition.

AB - Collective Thomson scattering (CTS) measurements provide information about the composition and velocity distribution of confined ion populations in fusion plasmas. The bulk ion part of the CTS spectrum is dominated by scattering off fluctuations driven by the motion of thermalized ion populations. It thus contains information about the ion temperature, rotation velocity, and plasma composition. To resolve the bulk ion region and access this information, we installed a fast acquisition system capable of sampling rates up to 12.5 GS/s in the CTS system at ASDEX Upgrade. CTS spectra with frequency resolution in the range of 1 MHz are then obtained through direct digitization and Fourier analysis of the CTS signal. We here describe the design, calibration, and operation of the fast receiver system and give examples of measured bulk ion CTS spectra showing the effects of changing ion temperature, rotation velocity, and plasma composition.

U2 - 10.1063/1.4894199

DO - 10.1063/1.4894199

M3 - Journal article

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JO - Review of Scientific Instruments

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