Speaker
Seppo Sipilä
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P2.1067.pdf
Monte Carlo ion cyclotron heating and fast ion loss detector simulations
in ASDEX Upgrade
S. Sipilä1, J. Varje1, T. Johnson2, T. Kurki-Suonio1, J. Galdón Quiroga3, J. González Martín3,
the ASDEX Upgrade Team and the EUROfusion MST1 Team*
1
EUROfusion-VTT, Dept. of Applied Physics, Aalto University, FI-00076 AALTO, Finland
2
EUROfusion-VR, Fusion Plasma Physics, EES, KTH, Stockholm, Sweden
3
Dept. of Atomic, Molecular and Nuclear Physics, University of Seville, 41012 Seville, Spain
The orbit-following simulation tool ASCOT-RFOF consists of the orbit-following Monte
Carlo code ASCOT [1] interfaced to the radiofrequency heating Monte Carlo code library
RFOF [2]. In the present work, ASCOT-RFOF is applied to simulate fundamental mode ion
cyclotron (IC) heating of hydrogen in ASDEX Upgrade discharge #33147 at t = 1.0 s and the
related fast ion loss detector (FILD) signal. This discharge was chosen because it is well
diagnosed and provides the possibility of further, more challenging simulations due to an
observed FILD signal oscillation attributed to a beat effect between MHD modes, which is
expected to be within ASCOT’s simulation capabilities.
In the two-stage simulation scheme, the IC-heated hydrogen population is first created by an
ASCOT-RFOF simulation, starting with 500.000 ion markers that represent a Maxwellian
hydrogen population making up 3% of the total ion density, which consists mainly of
deuterium.
The IC-heated hydrogen distribution is then used as input for ASCOT’s
distribution-sampling marker source module, and 500.000 sampled hot ion markers are used
in a simulation of the hot ion wall load and fast ion loss detector (FILD) signal in the presence
of AUG’s toroidal field ripple of about 0.5%. The simulation results are compared to FILD
signal measurements from the modelled discharge [3].
[1] E. Hirvijoki et al., “ASCOT: Solving the kinetic equation of minoriy particle species in tokamak plasmas”.
Computer Physics Communications 185 (2014) 1310-1321.
[2] T. Johnson et al., “Library for RF Interactions in Orbit Following Codes”. AIP Conference Proceedings
1406 (2011) 373.
[3] M. García-Muñoz and S. Sharapov, at MST1 AUG 1.7-2 Meeting, Seville, Spain, 28 July 2016.
*
See the author list of H. Meyer et al., Nuclear Fusion 57 (2017) 102014
