Publications (14)
Cross-Calibration and First Vertical ECE Measurement of Electron Energy Distribution in the TCV Tokamak
A. Tema Biwole, L. Porte, A. Fasoli +8
This paper describes the first Vertical Electron Cyclotron Emission (V-ECE) measurement of non-thermal electron distributions in the \textit{Tokamak à Configuration Variable}, TCV.…
Kinetic modelling of runaway electron avalanches in tokamak plasmas
E. Nilsson, J. Decker, Y. Peysson +3
Runaway electrons (REs) can be generated in tokamak plasmas if the accelerating force from the toroidal electric field exceeds the collisional drag force due to Coulomb collisions…
Perturbation analysis of trapped-particle dynamics in axisymmetric dipole geometry
F. -X. Duthoit, A. J. Brizard, Y. Peysson +1
The perturbation analysis of the bounce action-angle coordinates for charged particles trapped in an axisymmetric dipole magnetic field is presented. First, the lowest-ord…
Bump formation in the runaway electron tail
J. Decker, E. Hirvijoki, O. Embreus +4
Runaway electrons are generated in a magnetized plasma when the parallel electric field exceeds a critical value. For such electrons with energies typically reaching tens of MeV, t…
Experimental and numerical investigation of suprathermal electron dynamics using vertical electron cyclotron emission
L. Votta, M. Hoppe, J. Decker +6
The Tokamak à Configuration Variable (TCV) is equipped with an advanced set of diagnostics for studying suprathermal electron dynamics. Among these, the vertical electron cyclotron…
Radiation reaction induced non-monotonic features in runaway electron distributions
E. Hirvijoki, I. Pusztai, J. Decker +3
Runaway electrons, which are generated in a plasma where the induced electric field exceeds a certain critical value, can reach very high energies in the MeV range. For such energe…
Orbit-averaged Guiding-center Fokker-Planck Operator
A. J. Brizard, J. Decker, Y. Peysson +1
A general orbit-averaged guiding-center Fokker-Planck operator suitable for the numerical analysis of transport processes in axisymmetric magnetized plasmas is presented. The orbit…
Lower Hybrid antennas for nuclear fusion experiments
Julien Hillairet, J. Achard, Young-Soon Bae +40
The nuclear fusion research goal is to demonstrate the feasibility of fusion power for peaceful purposes. In order to achieve the conditions similar to those expected in an electri…
Latest results on quiescent and post-disruption runaway electron mitigation experiments at Frascati Tokamak Upgrade
D. Carnevale, P. Buratti, M. Baruzzo +38
Results from the last FTU campaigns on the deuterium large (wrt FTU volume) pellet REs suppression capability, mainly due to the induced burst MHD activity expelling REs seed are p…
Tomographic reconstruction of the runaway distribution function in TCV using multispectral synchrotron images
T. A. Wijkamp, A. Perek, J. Decker +8
Synchrotron radiation observed in a quiescent TCV runaway discharge is studied using filtered camera images targeting three distinct wavelength intervals. Through the tomographic S…
Expulsion of runaway electrons using ECRH in the TCV tokamak
J. Decker, M. Hoppe, U. Sheikh +19
Runaway electrons (REs) are a concern for tokamak fusion reactors from discharge startup to termination. A sudden localized loss of a multi-megaampere RE beam can inflict severe da…
Trapped-Electron Runaway Effect
E. Nilsson, J. Decker, N. J. Fisch +1
In a tokamak, trapped electrons subject to a strong electric field cannot run away immediately, because their parallel velocity does not increase over a bounce period. However, the…
Runaway electron synchrotron radiation in a vertically translated plasma
M. Hoppe, G. Papp, T. Wikjamp +6
Synchrotron radiation observed from runaway electrons (REs) in tokamaks depends upon the position and size of the RE beam, the RE energy and pitch distributions, as well as the loc…
Recent progress on lower hybrid current drive and implications for ITER
Julien Hillairet, A. Ekedahl, M. Goniche +23
The sustainment of steady-state plasmas in tokamaks requires efficient current drive systems. Lower Hybrid Current Drive (LHCD) is currently the most efficient method to generate a…