Ion temperature measurement of tokamak plasmas by collective Thomson scattering of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">D</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>O laser radiation

Behn, R.; Dicken, D.; Hackmann, J.; Salito, S.A.; Siegrist, Michael; Krug, Peter; Kjelberg, I.; Duval, B. P.; Joye, B.; Pochelon, A.

doi:10.1103/physrevlett.62.2833

Cited by 120 publications

(42 citation statements)

References 4 publications

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“…At lower frequency shifts, in the bulk ion region of the spectrum, CTS measurements provide information about thermal ion populations including properties such as the ion temperature and drift a) mspe@fysik.dtu.dk velocity (i.e. plasma rotation) [20][21][22][23][24][25][26][27][28][29][30] . For certain scattering geometries and plasma conditions, the bulk ion region of CTS spectra can also contain signatures of the ion cyclotron motion and of plasma waves such as the ion acoustic wave, ion Bernstein waves and fast magnetosonic waves.…”

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confidence: 99%

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

Stejner

Nielsen

Jacobsen

et al. 2014

Review of Scientific Instruments

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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.

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mentioning

confidence: 99%

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

Stejner

Nielsen

Jacobsen

et al. 2014

Review of Scientific Instruments

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“…However, in the FIR range the sources are weaker and more challenging to build and operate. The first measurements of the bulk ion temperature in a tokamak 286 were done with an optically pumped FIR D 2 O laser. With powerful millimeter-wave sources in the form of gyrotrons, CTS in the millimeterwave range became a competitive option.…”

Section: Viie Choice Of Probe Frequencymentioning

confidence: 99%

Chapter 3: Microwave Diagnostics

Luhmann

Bindslev

Park

et al. 2008

Fusion Science and Technology

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“…In the area of fusion energy plasma diagnostics, millimeter and near millimeterwave techniques can be used for localized reactor core measurements of electron temperature [2], ion temperature [3], and fusion ion products [4]. These are key parameters for monitoring the performance of a fusion reactor core for which alternative optical and particle based diagnostic techniques may not be suitable in the next generation of large fusion burning experiments.…”

Section: Introductionmentioning

confidence: 99%

Graphite millimeter-wave waveguide and mirror for high temperature environments

Woskov

Titus²

1995

IEEE Trans. Microwave Theory Techn.

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A graphite helix corrugated waveguide with a miter mirror has been fabricated and used for 135 GHz pyrometer measurements on a high temperature plasma arc furnace. The guide has an internal diameter of 3.81 cm, a length of 123 cm, and a corrugation of 32 grooves/inch. One end of the guide was sealed with a Teflon window having moth eye surfaces to reduce reflections. The room temperature insertion loss of this guide assembly for HE 11 mode propagation and launch was measured to be 0.5 ± 0.1 dB.It was used successfully in a high temperature environment where the miter mirror end reached incandescent temperatures in excess of 12000 C.High temperature graphite surface corrosion typically increased the insertion loss to 1.2 ± 0.2 dB, but did not significantly effect the beam divergence.

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Ion temperature measurement of tokamak plasmas by collective Thomson scattering ofD2O laser radiation

Cited by 120 publications

References 4 publications

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

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

Chapter 3: Microwave Diagnostics

Graphite millimeter-wave waveguide and mirror for high temperature environments

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