13 citations · 79 across the 16 of their papers we have counts for
16 papers
Minimization of magnetic forces on Stellarator coils
Rémi Robin, Francesco Volpe
Magnetic confinement devices for nuclear fusion can be large and expensive. Compact stellarators are promising candidates for costreduction, but introduce new difficulties: confine…
Simultaneous iterative learning control of mode entrainment and error field
Wilkie Choi, Francesco Volpe
It is shown that static error fields (EFs) can severely limit the maximum rotation frequency achievable in mode entrainment by applied rotating fields. It is also shown that the ro…
Large vacuum flux surfaces generated by tilted planar coils
Jessica L. Li, Jacob Austin, Ben Y. Israeli +2
Helical equilibria can be generated by arrangements of planar coils similar to tokamaks, but without a central solenoid and with the toroidal field (TF) coils tilted with respect t…
Passive and active electromagnetic stabilization of free-surface liquid metal flows
S. M. H. Mirhoseini, R. R. Diaz-Pacheco, F. A. Volpe
Free-surface liquid metal flows tend to be uneven due to instabilities and other effects. Some applications, however, require constant, uniform liquid metal thickness. This is for…
Prospects for a dominantly microwave-diagnosed magnetically confined fusion reactor
Francesco A. Volpe
Compared to present experiments, tokamak and stellarator reactors will be subject to higher heat loads, sputtering, erosion and subsequent coating, tritium retention, higher neutro…
Full-Wave Feasibility Study of Anti-Radar Diagnostic of Magnetic Field Based on O-X Mode Conversion and Oblique Reflectometry Imaging
O. Meneghini, F. A. Volpe
An innovative millimeter wave diagnostic is proposed to measure the local magnetic field and edge current as a function of the minor radius in the tokamak pedestal region. The idea…
Resistive sensor and electromagnetic actuator for feedback stabilization of liquid metal walls in fusion reactors
S. M. H. Mirhoseini, F. A. Volpe
Liquid metal walls in fusion reactors will be subject to instabilities, turbulence, induced currents, error fields and temperature gradients that will make them locally bulge, thus…
Huygens-Fresnel wavefront tracing in non-uniform media
F. A. Volpe, P. -D. Letourneau, A. Zhao
We present preliminary results on a novel numerical method describing wave propagation in non-uniform media. Following Huygens-Fresnel' principle, we model the wavefront as an arra…
Conceptual design of first toroidal electron cyclotron resonance ion source and modeling of ion extraction from it
C. Caliri, D. Mascali, F. A. Volpe
Electron Cyclotron Resonance Ion Sources (ECRIS) progressed to higher and higher ion currents and charge states by adopting stronger magnetic fields (beneficial for confinement) an…
Multi-pole multi-zero frequency-independent phase-shifter
M. A. Bitar, A. Gallo, F. A. Volpe
A multi-pole, multi-zero design allowed realizing a "true" phase-shifter (not time-delayer) of flat frequency-response over more than 3 decades (30Hz-100kHz), which can be extended…
Reverse Chromatic Aberration and its Numerical Optimization in a Metamaterial Lens
W. J. Capecchi, N. Behdad, F. A. Volpe
In planar metamaterial lenses, the focal point moves with the frequency. Here it is shown numerically that this movement can be controlled by properly engineering the dimensions of…
Oblique electron-cyclotron-emission radial and phase detector of rotating magnetic islands applied to alignment and modulation of electron-cyclotron-current-drive for neoclassical tearing mode stabilization
F. Volpe, M. E. Austin, G. Campbell +1
A two channel oblique electron cyclotron emission (ECE) radiometer was installed on the DIII-D tokamak and interfaced to 4 gyrotrons. Oblique ECE was used to toroidally and radiall…
Magnetic Barriers and their q95 dependence at DIII-D
F. A. Volpe, J. Kessler, H. Ali +2
It is well known that externally generated resonant magnetic perturbations (RMPs) can form islands in the plasma edge. In turn, large overlapping islands generate stochastic fields…
Full-wave modeling of the O-X mode conversion in the Pegasus Toroidal Experiment
Alf Köhn, Jonathan Jacquot, Michael W. Bongard +3
The ordinary-extraordinary (O-X) mode conversion is modeled with the aid of a 2D full-wave code in the Pegasus Toroidal Experiment as a function of the launch angles. It is shown h…
A Spinning Mirror for Fast Angular Scans of EBW Emission for Magnetic Pitch Profile Measurement
Francesco Volpe
A tilted spinning mirror rapidly steers the line of sight of the electron Bernstein wave (EBW) emission radiometer at the Mega Amp Spherical Tokamak (MAST). In order to resist high…
Analytical Solution of the O-X Mode Conversion Problem
F. Volpe
The excitation of a slow extraordinary wave in a overdense plasma from an ordinary wave impinging on the critical layer in the plane spanned by the density gradient and magnetic fi…