An advection-diffusion model for cross-field runaway electron transport in perturbed magnetic fields

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An advection-diffusion model for cross-field runaway electron transport in perturbed magnetic fields. / Särkimäki, Konsta; Hirvijoki, Eero; Decker, Joan; Varje, Jari; Kurki-Suonio, Taina.

In: Plasma Physics and Controlled Fusion, Vol. 58, No. 12, 125017, 17.11.2016, p. 1-11.

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@article{ffd0df65da7848058a0c365a297f07e2,
title = "An advection-diffusion model for cross-field runaway electron transport in perturbed magnetic fields",
abstract = "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 such, they lack the effects from the magnetic field stochasticity. Since stochasticity is naturally present in post-disruption plasma, and externally induced stochastization offers a prominent mechanism to mitigate RE avalanche, we present an advection-diffusion model that can be used to couple an orbit-following code to an orbit-averaged tool in order to capture the cross-field transport and to overcome the latter's limitation. The transport coefficients are evaluated via a Monte Carlo method. We show that the diffusion coefficient differs significantly from the well-known Rechester-Rosenbluth result. We also demonstrate the importance of including the advection: it has a two-fold role both in modelling transport barriers created by magnetic islands and in amplifying losses in regions where the islands are not present.",
keywords = "advection, diffusion, radial transport, runaway electron, stochastic magnetic field",
author = "Konsta S{\"a}rkim{\"a}ki and Eero Hirvijoki and Joan Decker and Jari Varje and Taina Kurki-Suonio",
year = "2016",
month = "11",
day = "17",
doi = "10.1088/0741-3335/58/12/125017",
language = "English",
volume = "58",
pages = "1--11",
journal = "Plasma Physics and Controlled Fusion",
issn = "0741-3335",
number = "12",

}

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TY - JOUR

T1 - An advection-diffusion model for cross-field runaway electron transport in perturbed magnetic fields

AU - Särkimäki, Konsta

AU - Hirvijoki, Eero

AU - Decker, Joan

AU - Varje, Jari

AU - Kurki-Suonio, Taina

PY - 2016/11/17

Y1 - 2016/11/17

N2 - 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 such, they lack the effects from the magnetic field stochasticity. Since stochasticity is naturally present in post-disruption plasma, and externally induced stochastization offers a prominent mechanism to mitigate RE avalanche, we present an advection-diffusion model that can be used to couple an orbit-following code to an orbit-averaged tool in order to capture the cross-field transport and to overcome the latter's limitation. The transport coefficients are evaluated via a Monte Carlo method. We show that the diffusion coefficient differs significantly from the well-known Rechester-Rosenbluth result. We also demonstrate the importance of including the advection: it has a two-fold role both in modelling transport barriers created by magnetic islands and in amplifying losses in regions where the islands are not present.

AB - 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 such, they lack the effects from the magnetic field stochasticity. Since stochasticity is naturally present in post-disruption plasma, and externally induced stochastization offers a prominent mechanism to mitigate RE avalanche, we present an advection-diffusion model that can be used to couple an orbit-following code to an orbit-averaged tool in order to capture the cross-field transport and to overcome the latter's limitation. The transport coefficients are evaluated via a Monte Carlo method. We show that the diffusion coefficient differs significantly from the well-known Rechester-Rosenbluth result. We also demonstrate the importance of including the advection: it has a two-fold role both in modelling transport barriers created by magnetic islands and in amplifying losses in regions where the islands are not present.

KW - advection

KW - diffusion

KW - radial transport

KW - runaway electron

KW - stochastic magnetic field

UR - http://www.scopus.com/inward/record.url?scp=84997770122&partnerID=8YFLogxK

U2 - 10.1088/0741-3335/58/12/125017

DO - 10.1088/0741-3335/58/12/125017

M3 - Article

VL - 58

SP - 1

EP - 11

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 12

M1 - 125017

ER -

ID: 14982140