Modeling non-stationary, non-axisymmetric heat patterns in DIII-D tokamak

Ciro, D.; Evans, T. E.; Caldas, I. L.

doi:10.1088/0029-5515/57/1/016017

Title: Modeling non-stationary, non-axisymmetric heat patterns in DIII-D tokamak

Journal Article · Thu Oct 27 00:00:00 EDT 2016 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/57/1/016017· OSTI ID:1372075

Ciro, D. ^[1]; Evans, T. E. ^[2]; Caldas, I. L. ^[1]

Univ. of Sao Paulo (Brazil). Dept. of Applied Physics
General Atomics, San Diego, CA (United States)

Non-axisymmetric stationary magnetic perturbations lead to the formation of homoclinic tangles near the divertor magnetic saddle in tokamak discharges. These tangles intersect the divertor plates in static helical structures that delimit the regions reached by open magnetic field lines reaching the plasma column and leading the charged particles to the strike surfaces by parallel transport. In this article we introduce a non-axisymmetric rotating magnetic perturbation to model the time evolution of the three-dimensional magnetic field of a singlenull DIII-D tokamak discharge developing a rotating tearing mode. The non-axiymmetric field is modeled using the magnetic signals to adjust the phases and currents of a set of internal filamentary currents that approximate the magnetic field in the plasma edge region. The stable and unstable manifolds of the asymmetric magnetic saddle are obtained through an adaptive calculation providing the cuts at a given poloidal plane and the strike surfaces. Lastly, for the modeled shot, the experimental heat pattern and its time development are well described by the rotating unstable manifold, indicating the emergence of homoclinic lobes in a rotating frame due to the plasma instabilities.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Department of Applied Physics, São Paulo University, São Paulo, CEP 05508-090, Brazil

Grant/Contract Number:: FC02-04ER54698; SC0012706; FG02-05ER54809; 2011/19269-11; 2012/18073-1; 2014/03899-7

OSTI ID:: 1372075

Alternate ID(s):: OSTI ID: 1330113

Journal Information:: Nuclear Fusion, Vol. 57, Issue 1; Related Information: D. Ciro, T.E. Evans, I.L. Caldas, "Modeling non-stationary, non-axisymmetric heat patterns in DIII-D tokamak", Nucl. Fusion 57, 016017 (2017); ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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