Carbon migration during methane injection experiments under ITER divertor-relevant conditions

K.E. Bystrov; L.B. Vegt, van der; G.A. Swaaij, van; T. Zaharia; Y. Kuang; W.J. Goedheer; G.C. De Temmerman

doi:10.1016/j.jnucmat.2013.01.145

Carbon migration during methane injection experiments under ITER divertor-relevant conditions

K.E. Bystrov, L.B. Vegt, van der, G.A. Swaaij, van, T. Zaharia, Y. Kuang, W.J. Goedheer, G.C. De Temmerman

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Abstract

Methane was injected into a high density low temperature hydrogen plasma beam (ne ¿ 1021 m-3, Te ~ 1 eV) in Pilot-PSI to study carbon transport and provide a benchmark case for modeling. Gas injection was performed through molybdenum samples that acted as collectors of redeposits. The CH A–X band emission plumes are localized near the injection hole with a typical width of ~3 mm and a decay length of ~1.5 mm. The geometry of the emission profile is not influenced by the electron temperature. The redeposition efficiency and codeposit structure depend on the surface temperature. Surface temperatures below 500 K promote growth of a-C:H films across the surface and lead to redeposition of up to 38% of injected carbon. Above 800 K the redeposition efficiency decreases strongly and carbon microparticles are found near the injection hole.

Original language	English
Pages (from-to)	S686-S689
Number of pages	4
Journal	Journal of Nuclear Materials
Volume	438
Issue number	Suppl.
DOIs	https://doi.org/10.1016/j.jnucmat.2013.01.145
Publication status	Published - 2013

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title = "Carbon migration during methane injection experiments under ITER divertor-relevant conditions",

abstract = "Methane was injected into a high density low temperature hydrogen plasma beam (ne ¿ 1021 m-3, Te ~ 1 eV) in Pilot-PSI to study carbon transport and provide a benchmark case for modeling. Gas injection was performed through molybdenum samples that acted as collectors of redeposits. The CH A–X band emission plumes are localized near the injection hole with a typical width of ~3 mm and a decay length of ~1.5 mm. The geometry of the emission profile is not influenced by the electron temperature. The redeposition efficiency and codeposit structure depend on the surface temperature. Surface temperatures below 500 K promote growth of a-C:H films across the surface and lead to redeposition of up to 38% of injected carbon. Above 800 K the redeposition efficiency decreases strongly and carbon microparticles are found near the injection hole.",

author = "K.E. Bystrov and {Vegt, van der}, L.B. and {Swaaij, van}, G.A. and T. Zaharia and Y. Kuang and W.J. Goedheer and {De Temmerman}, G.C.",

year = "2013",

doi = "10.1016/j.jnucmat.2013.01.145",

language = "English",

volume = "438",

pages = "S686--S689",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

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TY - JOUR

T1 - Carbon migration during methane injection experiments under ITER divertor-relevant conditions

AU - Bystrov, K.E.

AU - Vegt, van der, L.B.

AU - Swaaij, van, G.A.

AU - Zaharia, T.

AU - Kuang, Y.

AU - Goedheer, W.J.

AU - De Temmerman, G.C.

PY - 2013

Y1 - 2013

N2 - Methane was injected into a high density low temperature hydrogen plasma beam (ne ¿ 1021 m-3, Te ~ 1 eV) in Pilot-PSI to study carbon transport and provide a benchmark case for modeling. Gas injection was performed through molybdenum samples that acted as collectors of redeposits. The CH A–X band emission plumes are localized near the injection hole with a typical width of ~3 mm and a decay length of ~1.5 mm. The geometry of the emission profile is not influenced by the electron temperature. The redeposition efficiency and codeposit structure depend on the surface temperature. Surface temperatures below 500 K promote growth of a-C:H films across the surface and lead to redeposition of up to 38% of injected carbon. Above 800 K the redeposition efficiency decreases strongly and carbon microparticles are found near the injection hole.

AB - Methane was injected into a high density low temperature hydrogen plasma beam (ne ¿ 1021 m-3, Te ~ 1 eV) in Pilot-PSI to study carbon transport and provide a benchmark case for modeling. Gas injection was performed through molybdenum samples that acted as collectors of redeposits. The CH A–X band emission plumes are localized near the injection hole with a typical width of ~3 mm and a decay length of ~1.5 mm. The geometry of the emission profile is not influenced by the electron temperature. The redeposition efficiency and codeposit structure depend on the surface temperature. Surface temperatures below 500 K promote growth of a-C:H films across the surface and lead to redeposition of up to 38% of injected carbon. Above 800 K the redeposition efficiency decreases strongly and carbon microparticles are found near the injection hole.

U2 - 10.1016/j.jnucmat.2013.01.145

DO - 10.1016/j.jnucmat.2013.01.145

M3 - Article

SN - 0022-3115

VL - 438

SP - S686-S689

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - Suppl.

ER -

Carbon migration during methane injection experiments under ITER divertor-relevant conditions

Abstract

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