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RISS 인기검색어
- 검색키워드
- 저자 : Magesh T. (검색결과 2 건)
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Terahertz radiation from plasma filament generated by two-color laser gas-plasma interaction
Magesh Kumar, K. K.,Kumar, M.,Yuan, T.,Sheng, Z. M.,Chen, M. Cambridge University Press 2015 Laser and particle beams Vol.33 No.3
<B>Abstract</B><P>We develop a theoretical model for terahertz (THz) radiation generation, when an intense short laser pulse (ω1, <I>k</I>1) is mixed with its frequency shifted second harmonic (ω2, <I>k</I>2), where ω2 = 2ω1 + ωT and ωT is in the THz range in the plasma. The lasers exert a ponderomotive force on the electrons and drive density perturbations at (2ω1, 2<I>k</I>1) and (ω2 − ω1, <I>k</I>2 − <I>k</I>1). These density perturbations couple with the oscillatory velocities of the electron due to the lasers and produce a nonlinear current at (ω2 − 2ω1, <I>k</I>2 − 2<I>k</I>1). This current acts as an antenna to produce the THz radiation. The THz power depends upon the square of plasma density and $I_1^2 {I_2}$, where <I>I</I>1 and <I>I</I>2 are the intensities of fundamental and second harmonic laser. The radiation is mainly along the forward direction. Two-dimensional particle-in-cell simulations are used to study the near-field radiation properties.</P>
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Assessment of Flicker Emission in a Grid Connected Wind Farms
Magesh T.,Devi G.,Lakshmanan T. 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.4
Wind farms in Tamil Nadu's Coimbatore district have identified several issues, including flickering emissions, frequent generator tripping, and power evacuation issues caused by a weak grid. Taking into consideration the scarcity of research on flickering emissions, this work focuses on the causes of short-term flicker severity (Pst) in wind farms that export generated power to industrial loads. To identify the scenarios that cause flickering, simulation models of fixed speed wind farm and variable speed wind farm with controllers were developed using DIgSILENT power factory software. The flicker emissions were measured at the wind farm substations using Fluke and Dranetz PX5.8 power quality analyzers in accordance with the IEC 61400-21 standard. To validate the simulation model, the results from the flickermeter during the simulation and the field measurements were compared. According to the results of this research, both fixed and variable speeds produce flicker emissions that exceed the IEC standard limit, that causes the power electronics-based industrial drives to fail to operate. The controllers were developed to improve the performance of wind farms that will benefit the current and future wind energy-efficient conversion systems.
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