Improved carbon migration modelling with the ERO code

Olivier Van Hoey; Andreas Kirschner; Carolina Bjorkas; Dmitry Borodin; Dmitry Matveev; Inge Uytdenhouwen; Guido Van Oost; Vincent Massaut

doi:10.1016/j.jnucmat.2013.01.193

Improved carbon migration modelling with the ERO code

Olivier Van Hoey, Andreas Kirschner, Carolina Bjorkas, Dmitry Borodin, Dmitry Matveev, Inge Uytdenhouwen, Guido Van Oost, Vincent Massaut

Research output › peer-review

Abstract

Material migration is a crucial issue in thermonuclear fusion devices. To study carbon migration, 13CH4 has been injected through a polished graphite roof-like test limiter in the TEXTOR scrape-off layer. The interpretation of the experimental 13C deposition patterns on the roof limiter surface has been done with the ERO impurity transport code. To reproduce the very low experimental 13C deposition efficiencies with ERO, an enhanced re-erosion mechanism for re-deposited carbon had to be assumed in previous studies. However, erosion by hydrogenic species produced during dissociation of injected 13CH4 was not taken into account by ERO in these studies. This additional erosion could maybe explain the very low experimental 13C deposition efficiencies. Therefore, it is now taken into account in ERO. Also more realistic physical sputtering yields and hydrocarbon reflection probabilities have been implemented in ERO. The simulations with these improvements included clearly confirm the need for enhanced re-erosion of re-deposited carbon.

Original language	English
Pages (from-to)	S891-S894
Journal	Journal of Nuclear Materials
Volume	438
DOIs	https://doi.org/10.1016/j.jnucmat.2013.01.193
State	Published - 17 Jan 2013

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Cite this

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title = "Improved carbon migration modelling with the ERO code",

abstract = "Material migration is a crucial issue in thermonuclear fusion devices. To study carbon migration, 13CH4 has been injected through a polished graphite roof-like test limiter in the TEXTOR scrape-off layer. The interpretation of the experimental 13C deposition patterns on the roof limiter surface has been done with the ERO impurity transport code. To reproduce the very low experimental 13C deposition efficiencies with ERO, an enhanced re-erosion mechanism for re-deposited carbon had to be assumed in previous studies. However, erosion by hydrogenic species produced during dissociation of injected 13CH4 was not taken into account by ERO in these studies. This additional erosion could maybe explain the very low experimental 13C deposition efficiencies. Therefore, it is now taken into account in ERO. Also more realistic physical sputtering yields and hydrocarbon reflection probabilities have been implemented in ERO. The simulations with these improvements included clearly confirm the need for enhanced re-erosion of re-deposited carbon.",

keywords = "fusion, ERO code, carbon, hydrogen",

author = "{Van Hoey}, Olivier and Andreas Kirschner and Carolina Bjorkas and Dmitry Borodin and Dmitry Matveev and Inge Uytdenhouwen and {Van Oost}, Guido and Vincent Massaut",

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AU - Van Hoey, Olivier

AU - Kirschner, Andreas

AU - Bjorkas, Carolina

AU - Borodin, Dmitry

AU - Matveev, Dmitry

AU - Uytdenhouwen, Inge

AU - Van Oost, Guido

A2 - Massaut, Vincent

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N2 - Material migration is a crucial issue in thermonuclear fusion devices. To study carbon migration, 13CH4 has been injected through a polished graphite roof-like test limiter in the TEXTOR scrape-off layer. The interpretation of the experimental 13C deposition patterns on the roof limiter surface has been done with the ERO impurity transport code. To reproduce the very low experimental 13C deposition efficiencies with ERO, an enhanced re-erosion mechanism for re-deposited carbon had to be assumed in previous studies. However, erosion by hydrogenic species produced during dissociation of injected 13CH4 was not taken into account by ERO in these studies. This additional erosion could maybe explain the very low experimental 13C deposition efficiencies. Therefore, it is now taken into account in ERO. Also more realistic physical sputtering yields and hydrocarbon reflection probabilities have been implemented in ERO. The simulations with these improvements included clearly confirm the need for enhanced re-erosion of re-deposited carbon.

AB - Material migration is a crucial issue in thermonuclear fusion devices. To study carbon migration, 13CH4 has been injected through a polished graphite roof-like test limiter in the TEXTOR scrape-off layer. The interpretation of the experimental 13C deposition patterns on the roof limiter surface has been done with the ERO impurity transport code. To reproduce the very low experimental 13C deposition efficiencies with ERO, an enhanced re-erosion mechanism for re-deposited carbon had to be assumed in previous studies. However, erosion by hydrogenic species produced during dissociation of injected 13CH4 was not taken into account by ERO in these studies. This additional erosion could maybe explain the very low experimental 13C deposition efficiencies. Therefore, it is now taken into account in ERO. Also more realistic physical sputtering yields and hydrocarbon reflection probabilities have been implemented in ERO. The simulations with these improvements included clearly confirm the need for enhanced re-erosion of re-deposited carbon.

KW - fusion

KW - ERO code

KW - carbon

KW - hydrogen

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UR - http://knowledgecentre.sckcen.be/so2/bibref/10586

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JF - Journal of Nuclear Materials

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