Low-power-threshold parametric decay instabilities of powerful microwave beams in toroidal fusion devices

2020 ◽  
Vol 63 (4) ◽  
pp. 365-387
Author(s):  
E Z Gusakov ◽  
A Yu Popov
Keyword(s):  
Low Power ◽  
Parametric Decay ◽  
Power Threshold ◽  
Microwave Beams ◽  
Powerful Microwave

scholarly journals Power threshold and saturation of parametric decay instabilities near the upper hybrid resonance in plasmas

2019 ◽  
Vol 26 (6) ◽  
pp. 062102 ◽  
Author(s):  
S. K. Hansen ◽  
S. K. Nielsen ◽  
J. Stober ◽  
J. Rasmussen ◽  
M. Salewski ◽  
...  
Keyword(s):  
Parametric Decay ◽  
Hybrid Resonance ◽  
Power Threshold

Ethanol catalytic optical driven deposition for 1D and 2D materials with ultra-low power threshold of 0 dBm

2018 ◽  
Vol 406 ◽  
pp. 18-23 ◽  
Author(s):  
Hao Wang ◽  
Bohua Chen ◽  
Xu Xiao ◽  
Chaoshi Guo ◽  
Xiaoyan Zhang ◽  
...  
Keyword(s):  
Low Power ◽  
2D Materials ◽  
Ultra Low Power ◽  
Power Threshold

scholarly journals Low Power Threshold Photochemical Upconversion Using a Zirconium (IV) LMCT Photosensitizer

2021 ◽  
Author(s):  
Mo Yang ◽  
Sara Sheykhi ◽  
Yu Zhang ◽  
Carsten Milsmann ◽  
Felix N Castellano
Keyword(s):  
Charge Transfer ◽  
Low Power ◽  
Current Investigation ◽  
Metal Charge ◽  
Highly Efficient ◽  
Power Threshold ◽  
Metal Charge Transfer

The current investigation demonstrates highly efficient photochemical upconversion (UC) where a long-lived Zr(IV) ligand-to-metal charge transfer (LMCT) complex serves as a triplet photosensitizer in concert with well-estabilished 9,10-diphenylanthracene (DPA) along...

Low-power-threshold photonic saturable absorber in nonlinear chalcogenide glass

2015 ◽  
Vol 40 (2) ◽  
pp. 257 ◽  
Author(s):  
S. Minardi ◽  
G. Cheng ◽  
C. D’Amico ◽  
R. Stoian
Keyword(s):  
Low Power ◽  
Chalcogenide Glass ◽  
Saturable Absorber ◽  
Power Threshold

scholarly journals Anomalous absorption in ECRH experiments due to the parametric low-threshold excitation of localized UH waves

2019 ◽  
Vol 203 ◽  
pp. 01002
Author(s):  
Alexei Yu. Popov ◽  
Evgeniy Z. Gusakov
Keyword(s):  
Pump Wave ◽  
Low Frequency ◽  
Extraordinary Wave ◽  
Anomalous Absorption ◽  
Magnetic Island ◽  
Parametric Decay ◽  
Threshold Excitation ◽  
Power Threshold ◽  
Low Threshold ◽  
Low Frequency Waves

We describe the theoretical model which interprets the anomalous phenomena, i.e. the generation of backscattering signal observed in the ECRH experiments at TEXTOR, TCV, TJ-II, ASDEX-UG, LHD and FTU, as a consequence of the excitation of the parametric decay instability (PDI) leading to anomalous damping of the pump wave. The PDI power-threshold is shown to be extremely low due to the localization of both or one daughter upper hybrid (UH) waves in presence of a nonmonotonic (hollow) density profile, which is often observed in the ECRH experiments due to the magnetic island or the density pump-out effect. In the case of the extraordinary wave pump the model predicts substantial (up to 25%) anomalous absorption in the electron channel and explains the anomalous ion acceleration by the generation of secondary low frequency waves which directly transfer the pump power to the ion component. The possibility of anomalous absorption of the O-mode pump in the ECRH experiment due to the parametric excitation of trapped UH wave is also discussed and the anomalous absorption rate at the 10% level is predicted.

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