# Two-dimensional electric current effects on a magnetized plasma in contact with a surface

A.E. Shumack, H.J. de Blank, J. Westerhout, G.J. van Rooij

8 Citations (Scopus)

### Abstract

Significant electric fields both parallel and perpendicular to a magnetic field have been observed and modeled self-consistently in an ITER divertor relevant plasma–wall experiment. Due to magnetization, electric current is found to penetrate the plasma beam outside of the cascaded arc plasma source with a length scale proportional to $\sqrt{H_{\rm e}H_{\rm i}}$ , where He and Hi are the electron and ion Hall parameters, respectively. Plasma rotation measurements and chemical erosion profiles at a carbon target demonstrate that for a sufficiently well-magnetized plasma, a current through the target causes plasma–wall sheath potentials to significantly increase in a region of net ion collection while for the conditions studied, regions of net electron collection remain unaffected. The plasma–wall sheath profile at the target has been characterized experimentally as a function of negative target potential.
Language English Plasma Physics and Controlled Fusion 54 12 10.1088/0741-3335/54/12/125006 Published - Dec 2012 Yes

### Cite this

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title = "Two-dimensional electric current effects on a magnetized plasma in contact with a surface",
abstract = "Significant electric fields both parallel and perpendicular to a magnetic field have been observed and modeled self-consistently in an ITER divertor relevant plasma–wall experiment. Due to magnetization, electric current is found to penetrate the plasma beam outside of the cascaded arc plasma source with a length scale proportional to $\sqrt{H_{\rm e}H_{\rm i}}$ , where He and Hi are the electron and ion Hall parameters, respectively. Plasma rotation measurements and chemical erosion profiles at a carbon target demonstrate that for a sufficiently well-magnetized plasma, a current through the target causes plasma–wall sheath potentials to significantly increase in a region of net ion collection while for the conditions studied, regions of net electron collection remain unaffected. The plasma–wall sheath profile at the target has been characterized experimentally as a function of negative target potential.",
author = "A.E. Shumack and {de Blank}, H.J. and J. Westerhout and {van Rooij}, G.J.",
year = "2012",
month = "12",
doi = "10.1088/0741-3335/54/12/125006",
language = "English",
volume = "54",
journal = "Plasma Physics and Controlled Fusion",
issn = "0741-3335",
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Two-dimensional electric current effects on a magnetized plasma in contact with a surface. / Shumack, A.E.; de Blank, H.J.; Westerhout, J.; van Rooij, G.J.

In: Plasma Physics and Controlled Fusion, Vol. 54, No. 12, 12.2012.

TY - JOUR

T1 - Two-dimensional electric current effects on a magnetized plasma in contact with a surface

AU - Shumack,A.E.

AU - de Blank,H.J.

AU - Westerhout,J.

AU - van Rooij,G.J.

PY - 2012/12

Y1 - 2012/12

N2 - Significant electric fields both parallel and perpendicular to a magnetic field have been observed and modeled self-consistently in an ITER divertor relevant plasma–wall experiment. Due to magnetization, electric current is found to penetrate the plasma beam outside of the cascaded arc plasma source with a length scale proportional to $\sqrt{H_{\rm e}H_{\rm i}}$ , where He and Hi are the electron and ion Hall parameters, respectively. Plasma rotation measurements and chemical erosion profiles at a carbon target demonstrate that for a sufficiently well-magnetized plasma, a current through the target causes plasma–wall sheath potentials to significantly increase in a region of net ion collection while for the conditions studied, regions of net electron collection remain unaffected. The plasma–wall sheath profile at the target has been characterized experimentally as a function of negative target potential.

AB - Significant electric fields both parallel and perpendicular to a magnetic field have been observed and modeled self-consistently in an ITER divertor relevant plasma–wall experiment. Due to magnetization, electric current is found to penetrate the plasma beam outside of the cascaded arc plasma source with a length scale proportional to $\sqrt{H_{\rm e}H_{\rm i}}$ , where He and Hi are the electron and ion Hall parameters, respectively. Plasma rotation measurements and chemical erosion profiles at a carbon target demonstrate that for a sufficiently well-magnetized plasma, a current through the target causes plasma–wall sheath potentials to significantly increase in a region of net ion collection while for the conditions studied, regions of net electron collection remain unaffected. The plasma–wall sheath profile at the target has been characterized experimentally as a function of negative target potential.

U2 - 10.1088/0741-3335/54/12/125006

DO - 10.1088/0741-3335/54/12/125006

M3 - Article

VL - 54

JO - Plasma Physics and Controlled Fusion

T2 - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 12

ER -