224 citations · 433 across the 14 of their papers we have counts for
14 papers
Serpent neutronics model of Wendelstein 7-X for 14.1 MeV neutrons
Simppa Äkäslompolo, Jan Paul Koschinsky, Joona Kontula +8
In this work, a Serpent 2 neutronics model of the Wendelstein 7-X (W7-X) stellarator is prepared, and an response function for the Scintillating-Fibre neutron detector (SciFi) is c…
ASCOT simulations of 14 MeV neutron rates in W7-X: effect of magnetic configuration
Joona Kontula, Jan Paul Koschinsky, Simppa Äkäslompolo +2
Neutron production rates in fusion devices are determined not only by the kinetic profiles but also the fast ion slowing-down distributions. In this work, we investigate the effect…
Synthetic fast ion diagnostics in tokamaks: comparing the Monte Carlo test particle code ASCOT against experiments
Simppa Äkäslompolo, Taina Kurki-Suonio, Seppo Sipilä +1
Measuring fast ions, most notably fusion alphas, in ITER and future reactors remains an issue that still lacks an adequate solution. Numerical simulations are invaluable in testing…
High-performance orbit-following code ASCOT5 for Monte Carlo simulations in fusion plasmas
Jari Varje, Konsta Särkimäki, Joona Kontula +5
We present a novel implementation of a Monte Carlo particle-following code for solving the distribution function of minority species in fusion plasmas, called ASCOT5, and verify it…
Validating the ASCOT modelling of NBI fast ions in Wendelstein 7-X stellarator
S. Äkäslompolo, P. Drewelow, Y. Gao +37
The first fast ion experiments in Wendelstein 7-X were performed in 2018. They are one of the first steps in demonstrating the optimised fast ion confinement of the stellarator. Th…
Mechanics of ELM control coil induced alpha particle transport
Konsta Särkimäki, Jari Varje, Marina Bécoulet +2
Using the orbit-following code ASCOT, we model alpha particle transport in ITER under the influence of ELM control coils (ECCs), toroidal field ripple, and test blanket modules, wi…
An advection-diffusion model for cross-field runaway electron transport in perturbed magnetic fields
Konsta Särkimäki, Eero Hirvijoki, Joan Decker +2
Disruption-generated runaway electrons (RE) present an outstanding issue for ITER. The predictive computational studies of RE generation rely on orbit-averaged computations and, as…
Biot Savart Law integrator BioSaw
Simppa Äkäslompolo, Tuomas Koskela, Taina Kurki-Suonio
This contribution documents the methods used in the BioSaw code. The code is inteded to be a flexible tool for calculating magnetic fields due to coils in magnetic confinement fusi…
Monte Carlo method and High Performance Computing for solving Fokker-Planck equation of minority plasma particles
Eero Hirvijoki, Taina Kurki-Suonio, Simppa Äkäslompolo +3
This paper explains how to obtain the distribution function of minority ions in tokamak plasmas using the Monte Carlo method. Since the emphasis is on energetic ions, the guiding-c…
Simulations of fast ion wall loads in ASDEX Upgrade in the presence of magnetic perturbations due to ELM mitigation coils
Otto Asunta, Simppa Äkäslompolo, Taina Kurki-Suonio +4
The effect of ASDEX Upgrade (AUG) ELM mitigation coils on fast ion wall loads was studied with the fast particle following Monte Carlo code ASCOT. Neutral beam injected (NBI) parti…
Calculating the 3D magnetic field of ITER for European TBM studies
Simppa Äkäslompolo, Otto Asunta, Thijs Bergmans +6
The magnetic perturbation due to the ferromagnetic test blanket modules (TBMs) may deteriorate fast ion confinement in ITER. This effect must be quantified by numerical studies in…
Adjoint Monte Carlo Simulation of Fusion Product Activation Probe Experiment in ASDEX Upgrade tokamak
Simppa Äkäslompolo, Georges Bonheure, Giovanni Tardini +1
The activation probe is a robust tool to measure flux of fusion products from a magnetically confined plasma. A carefully chosen solid sample is exposed to the flux, and the imping…
ASCOT: solving the kinetic equation of minority particle species in tokamak plasmas
Eero Hirvijoki, Otto Asunta, Tuomas Koskela +5
A comprehensive description of methods, suitable for solving the kinetic equation for fast ions and impurity species in tokamak plasmas using Monte Carlo approach, is presented. Th…
Monte Carlo implementation of a guiding-center Fokker-Planck kinetic equation
Eero Hirvijoki, Alain Brizard, Antti Snicker +1
A Monte Carlo method for the collisional guiding-center Fokker-Planck kinetic equation is derived to include the effects of background magnetic-field nonuniformity. It is shown tha…