Upper hybrid oscillation

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This contribution reports on the study of suprathermal electron radial transport enhancement in the presence of electron-heating radio-frequency waves, such as electron-cyclotron waves or lower-hybrid waves. Since suprathermal electrons emit hard X-rays from Bremsstrahlung, experimental data from hard X-ray measurements are used to follow their dynamics. In particular, electron-cyclotron power modulation experiments performed in TCV show that this transport depends on the total electron-cyclotron power. The

We present a CMOS-compatible, solvent-free nitrogen plasma doping strategy for enhancing the electrochemical performance of vertically aligned carbon nanotube (VACNT) electrode for on-chip supercapacitor applications. By leveraging a hybrid plasma–planar triple spiral antenna (PTSA) system, we decouple plasma density and ion energy to selectively introduce nitrogen species — namely pyrrolic, pyridinic, and quaternary nitrogen — into the VACNT framework. A two-step process comprising Ar plasma defect enginee

In order to get a better understanding of the linear and non-linear plasma interaction of microinstabilities and associated turbulence with different specific modes, an antenna is implemented in the global gyrokinetic code ORB5. It consists in applying an ...

In the present paper, the perturbation of the launched power spectrum of the Lower Hybrid wave at the separatrix by electron density fluctuations in the scrape-off layer is investigated. Considering a slab geometry with magnetic field lines parallel to the ...

Injecting Lower Hybrid Range of Frequency (LHRF) waves into Alcator C-Mod's high-density H-mode plasmas has led to enhanced global energy confinement by increasing pedestal temperature and pressure gradients, decreasing the separatrix density, modifying th ...

Two opposing approaches to include resonant magnetic perturbations (RMPs) in fast ion simulations are compared, one where the vacuum field caused by the RMP current coils is added to the axisymmetric MHD equilibrium, the other where the MHD equilibrium inc ...

The proper boundary conditions at the magnetic presheath entrance for plasma fluid turbulence models based on the drift approximation are derived, focusing on a weakly collisional plasma sheath with Ti≪Te and a magnetic field oblique to a totally absorbing ...

The Tokamak à configuration variable (TCV) features the highest electron cyclotron wave power density available to resonantly heat (ECRH) the electrons and to drive noninductive currents in a fusion grade plasma (ECCD). In more than 15 years of exploitatio ...

A modulated high frequency wave is used to remotely excite low frequency oscillations in a linear, strongly magnetized plasma column. An electromagnetic wave is launched as an extraordinary mode across the plasma by an external waveguide in the upper-hybrid frequency regime f almost-equal-to f(UH) almost-equal-to f(ce) almost-equal-to 8 GHz, with P less-than-or-equal-to 2 W. By frequency modulating (at f(FM) almost-equal-to 1-60 kHz, with f(ci) congruent-to 30 kHz) the pump wave, the resonant layer is swept

Upper hybrid oscillation

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Suprathermal electron transport studies in radio-frequency-heated tokamak plasmas

Nitrogen doping of vertically aligned carbon nanotubes for on-chip CMOS-compatible pseudocapacitive supercapacitors

Mode excitation by an antenna in global gyrokinetic simulations

Interaction between the Lower Hybrid wave and density fluctuations in the scrape-off layer

Improved confinement in high-density H-modes via modification of the plasma boundary with lower hybrid waves

Impact of RMP magnetic field simulation models on fast ion losses

Boundary conditions for plasma fluid models at the magnetic presheath entrance

Turbulent ion heating in TCV tokamak plasmas

Ion-Cyclotron Wave Excitation by Double-Resonance Coupling