Real-Time Control of Beam Trajectories Using Digital Signal Processor for the Heavy Ion Beam Probe on the Large Helical Device
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概要
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A real-time control system using a digital signal processor (DSP) was developed to control ion-beam trajectories of a heavy ion beam probe (HIBP) on the Large Helical Device (LHD). The electrostatic potential during temporal evolution of the magnetic field structure by a large plasma current was successfully measured with the help of this system for the first time. It has been demonstrated that the probe beam can be detected even in a plasma having a ∼120 kA plasma current at the toroidal field of 1.3 T using the control system, while the beam is substantially lost by only ∼40 kA current before arriving at the detector plate in the case without control. However, this system is unstable during operations when the probe beam is swept in time across the plasma cross section to obtain the time evolution of the potential profile. It is caused by a nonlinear character of the system due to the finite beam size.
著者
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NISHIURA Masaki
National Institute for Fusion Science
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Toi Kazuo
Department Of Electronics Faculty Of Engineering Nagoya University
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Nakamura Shigetoshi
Department Of Neurosurgery Toyohashi Municipal Hospital:department Of Neurosurgery Narita Memorial H
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Shimizu Akihiro
National Inst. For Fusion Sci. Toki 509-5292 Jpn
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Ido Takeshi
National Inst. For Fusion Sci. Toki 509-5292 Jpn
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TOI Kazuo
Department of Energy Science and Engineering, Nagoya University, Nagoya 464-8603, Japan
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NISHIURA Masaki
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
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NAKAMURA Shigetoshi
Department of Energy Science and Engineering, Nagoya University, Nagoya 464-8603, Japan
関連論文
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- Long Range Temperature Fluctuation in LHD
- Estimation of the Effective Collective Thomson Scattering Volume Using a Gaussian Beam in the LHD ECRH System
- Electrostatic Potential Measurement by Using 6-MeV Heavy Ion Beam Probe on LHD
- Experimental Conditions for Electron Bernstein Wave Heating Using EC Waves Injected from High-Field Side in CHS
- Collective Thomson Scattering Study Using Gyrotron in LHD
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- Development of Collective Thomson Scattering Diagnostic for Bulk and Fast Ions in the Large Helical Device
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- Study of Edge Transport Barrier Formation on CHS Plasma
- Characterization of Ion Cyclotron Wall Conditioning Using Material Probes in LHD
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- Charge fraction measurements for heavy particle beams generated by the tandem accelerator with MCP system
- Escaping Ion Measurement with High Time Resolution during Bursting Modes Induced by Neutral Beam Injection on CHS
- Density Regimes of Complete Detachment and Serpens Mode in LHD
- Determination of the Major Impurity Radiators in the Reheat Mode Discharges in the Compact Helical System
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- Experimental Results for Electron Bernstein Wave Heating in the Large Helical Device
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- Extraction of Negative Hydrogen Ions from Radio Frequency Driven Plasma Sources for Fusion Plasma Heating
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- Notch Filter in 70 GHz Range for Microwave Plasma Diagnostics
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