Development of a Plasma Diagnostics System Using an Impulse Waveform Voltage
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概要
- 論文の詳細を見る
A new application using an electric impulse signal has been developed for electron density profile measurements in the Large Helical Device (LHD). Using an impulse waveform voltage, which has broadband frequency components, we constructed an ultrashort pulsed radar reflectometer with 28 channels in X-, Ka-, and U-band frequency components. The effect of the bandwidth of an inline band-pass filter was investigated, and was optimized. For a multiple-channel and multiple-frequency band system, a new switching technique and multiplexer were developed. Using the Abel inversion method, the reconstructed electron density profile was obtained from the delay time as a function of the probing frequency. Good agreement with other diagnostics was obtained.
著者
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KAWAHATA Kazuo
National Insitute for Fusion Science
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TOKUZAWA Tokihiko
National Insitute for Fusion Science
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YAMADA Ichihiro
National Insitute for Fusion Science
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ITO Yasuhiko
National Institute for Fusion Science
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Tanaka Kenji
National Food Institute
関連論文
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- Achievement of 10 keV Central Electron Temperatures by ECH in LHD
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- Measurement of Edge Density Profiles and Fluctuations in the H-Mode Discharge of the Compact Helical System (CHS) with a Thermal Neutral Lithium Beam Probe
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- Analysis of Radial Electric Field Bifurcation in LHD Based on Neoclassical Transport Theory
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- Construction of a 100-Hz-Repetition-Rate 28-Channel Thomson Scattering System for the JIPPT-IIU Tokamak
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- Measurements of Absolute Cross Sections for Electron-Impact Ionization of Doubly Charged Rare Gas Ions:Ne^,Ar^,Kr^,andXe^
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- Estimation of the Effective Collective Thomson Scattering Volume Using a Gaussian Beam in the LHD ECRH System
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- Evaluation of Fast-Ion Confinement Using a Radially Injected Neutral Beam in the LHD
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