Soft x-ray measurements from the PDX tokamak

Silver, E H; Bitter, M; Brau, K; Eames, D; Greenberger, A; Hill, K W; Meade, D M; Roney, W; Sauthoff, N R; Goeler, S von

doi:10.2172/5155727

Cited by 5 publications

(5 citation statements)

References 1 publication

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“…The temperature average excitation cross sections for iron ions are used to calculate the concentration of Fe. 13 The power radiated in K ␣ transition by the impurity ions can be expressed as 13 P L ͑T e ͒ Ϸ n e n i ͗͘ T e ,K␣ E K␣ , where ͗͘ T e ,K␣ is the temperature average excitation cross section, n e is electron density, n i is the impurity density, E K␣ is the energy of the K ␣ line. Figure 10 exhibits the radial profile of the Fe K ␣ intensity by Abel inversion from the spectra measured with the SDD array.…”

Section: First Experimental Resultsmentioning

confidence: 99%

Soft x-ray pulse height analyzer in the HT-7 tokamak

Shi

Chen

Wan

et al. 2004

Review of Scientific Instruments

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A new soft x-ray pulse height analyzer (PHA), based on a Silicon Drift Detector (SDD) linear array consisting of 15 SDD detectors, has been installed in the HT-7 tokamak. The energy resolution of 150-180 eV at photon energy of 6 keV is achieved for the SDD with Peltier cooling. The effective time response of the SDD PHA is 50 ms. The profiles of electron temperature and the intensity of metallic impurities can be obtained with a spatial resolution of 3 cm. The performance and first experimental results from the new PHA system are presented.

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Section: First Experimental Resultsmentioning

confidence: 99%

Soft x-ray pulse height analyzer in the HT-7 tokamak

Shi

Chen

Wan

et al. 2004

Review of Scientific Instruments

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“…Two parallel amplifiers are typically used to enable sufficient energy resolution (~230 eV FWHM at 5.9 keV) to allow separation of close lying impurity K α peaks, while at the same time allowing high count rates for good time resolution and minimizing distortion of the spectrum by pulse pileup 114 . tokamak that an avalanche photodiode detector could be used to measure x-ray continuum spectra and T e .…”

Section: The Soft X-ray Spectrummentioning

confidence: 99%

Passive Spectroscopic Diagnostics for Magnetically-confined Fusion Plasmas

Stratton¹,

Bitter²,

Hill³

et al. 2007

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Spectroscopy of radiation emitted by impurities and hydrogen isotopes plays an important role in the study of magnetically-confined fusion plasmas, both in determining the effects of impurities on plasma behavior and in measurements of plasma parameters such as electron and ion temperatures and densities, particle transport, and particle influx rates. This paper reviews spectroscopic diagnostics of plasma radiation that are excited by collisional processes in the plasma, which are termed 'passive' spectroscopic diagnostics to distinguish them from 'active' spectroscopic diagnostics involving injected particle and laser beams. A brief overview of the ionization balance in hot plasmas and the relevant line and continuum radiation excitation mechanisms is given. Instrumentation in the soft X-ray, vacuum ultraviolet, ultraviolet, visible, and near-infrared regions of the spectrum is described and examples of measurements are given.Paths for further development of these measurements and issues for their implementation in a burning plasma environment are discussed.

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“…Например, она позволяет исследовать внутренние МГД-колебания плазмы и определять расположение поверхностей с рациональным значением запаса устойчивости [1,2], оценивать потери электронов за счет электронно-циклотронной эмиссии ECE [3] и убегающих электронов [4], ELM-события [5,6], отслеживать L−Hпереходы [7] и многое другое [8][9][10][11][12][13][14][15][16]. Такие устройства широко применяются на токамаках JET [17], MAST [8], DIII-D [18], Asdex-Upgrade [19], PDX [20], NSTX [21][22][23], EAST [5], MST [24], TCV [25,26], COMPASS [27,28]. В рентгеновских устройствах измерение производится без вмешательства в ход изучаемого процесса.…”

Section: Introductionunclassified

Измерение Электронной Температуры Плазмы Фольговым Рентгеновским Спектрометром, Установленным На Токамаках Туман-3м И Глобус-М2

Воронин¹,

Горяинов²,

Забродский³

et al. 2021

Журнал Технической Физики

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Technical solution were presented for a foil spectrometer installed on the Globus-M2 and TUMAN-3M tokamaks for measuring the electron plasma temperature. Measurements have been carried out of the time dependence of the plasma temperature in the central region of tokamaks. Using of integrated photodetectors and unique beryllium foils with a thickness of 14–80 µm made it possible to increase the sensitivity of the spectrometer. An important quality of the foils used were the increased values of strength, plasticity, homogeneity, and the absence of surface and internal defects. The combined use of the spectrometer with Thomson scattering diagnostics made it possible to carry out regular temperature measurements in the Globus-M2 tokamak with a high spatial and temporal resolution. The influence of impurities is estimated on the measurement of the electron temperature of the plasma.

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Soft x-ray measurements from the PDX tokamak

Cited by 5 publications

References 1 publication

Soft x-ray pulse height analyzer in the HT-7 tokamak

Soft x-ray pulse height analyzer in the HT-7 tokamak

Passive Spectroscopic Diagnostics for Magnetically-confined Fusion Plasmas

Измерение Электронной Температуры Плазмы Фольговым Рентгеновским Спектрометром, Установленным На Токамаках Туман-3м И Глобус-М2

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