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Deposition and erosion in local shadow regions of TEXTOR-94
KTH, Superseded Departments, Alfvén Laboratory.ORCID iD: 0000-0001-9901-6296
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2001 (English)In: Physica scripta. T, ISSN 0281-1847, Vol. T94, 141-145 p.Article in journal (Refereed) Published
Abstract [en]

Carbon erosion and deposition were investigated on the surface of a flat target covered with an a-C:H film and exposed for 197 s in the SOL of TEXTOR-94. The target was declined by 20 degrees with respect to the toroidal direction and partly protected by an aluminum (3 mm) plate which created an 8 mm wide local shadow. Thickness changes were measured by colorimetry after each plasma discharge. Carbon is eroded from surface areas near the plasma edge (LCFS +1 cm) and transported into the local shadow regions. Accumulation rates up to approximate to 7nm/s were found. The erosion in the local shadow regions (about - 0.1 nm/s) is due to charge exchange neutrals. The observations are confirmed by ion beam analyses and by preliminary calculations with the B2-EIRENE and ERO-TEXTOR code.

Place, publisher, year, edition, pages
2001. Vol. T94, 141-145 p.
Keyword [en]
URN: urn:nbn:se:kth:diva-21046DOI: 10.1238/Physica.Topical.094a00141ISI: 000171748000022OAI: diva2:339743
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Rubel, Marek J.
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