Deposition and re-erosion studies by means of local impurity injection in TEXTOR

A. Kirschner; A. Kreter; P. Wienhold; S. Brezinsek; J. W. Coenen; H. G. Esser; A. Pospieszczyk; Ch Schulz; U. Breuer; D. Borodin; M. Clever; R. Ding; A. Galonska; A. Huber; A. Litnovsky; D. Matveev; K. Ohya; V. Philipps; U. Samm; O. Schmitz; B. Schweer; H. Stoschus

doi:10.1016/j.jnucmat.2010.10.058

Deposition and re-erosion studies by means of local impurity injection in TEXTOR

A. Kirschner, A. Kreter, P. Wienhold, S. Brezinsek, J. W. Coenen, H. G. Esser, A. Pospieszczyk, Ch Schulz, U. Breuer, D. Borodin, M. Clever, R. Ding, A. Galonska, A. Huber, A. Litnovsky, D. Matveev, K. Ohya, V. Philipps, U. Samm, O. SchmitzB. Schweer, H. Stoschus

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26 Scopus citations

Abstract

Pioneering experiments to study local erosion and deposition processes have been carried out in TEXTOR by injecting ¹³C marked hydrocarbons (CH₄ and C₂H₄) as well as silane (SiD ₄) and tungsten-hexafluoride (WF₆) through test limiters exposed to the edge plasma. The influence of various limiter materials (C, W, Mo) and surface roughness, different geometries (spherical or roof-like) and local plasma parameters has been studied. Depending on these conditions the local deposition efficiency of injected species varies between 0.1% and 9% - the largest deposition has been found for ¹³CH₄ injection through unpolished, spherical C test limiter and ohmic plasma conditions. The most striking result is that ERO modelling cannot reproduce these low deposition efficiencies using the common assumptions on sticking probabilities and physical and chemical re-erosion yields. As an explanation large re-erosion due to background plasma and possibly low "effective sticking" of returning species is applied. This has been interpreted as enhanced re-erosion of re-deposits under simultaneous impact of high ion fluxes from plasma background.

Original language	English
Pages (from-to)	S239-S245
Journal	Journal of Nuclear Materials
Volume	415
Issue number	1 SUPPL
DOIs	https://doi.org/10.1016/j.jnucmat.2010.10.058
State	Published - 1 Aug 2011
Externally published	Yes

Bibliographical note

Funding Information:
This work, supported by the European Communities under the contract of Association between EURATOM/FZJ, was carried out within the framework of EFDA. The views and opinions expressed herein do not necessarily reflect those of the European Commission. CPU time for computations has been provided by JSC (Jülich Supercomputer Centre).

Funding

This work, supported by the European Communities under the contract of Association between EURATOM/FZJ, was carried out within the framework of EFDA. The views and opinions expressed herein do not necessarily reflect those of the European Commission. CPU time for computations has been provided by JSC (Jülich Supercomputer Centre).

Funders	Funder number
EURATOM/FZJ

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10.1016/j.jnucmat.2010.10.058

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Kirschner, A., Kreter, A., Wienhold, P., Brezinsek, S., Coenen, J. W., Esser, H. G., Pospieszczyk, A., Schulz, C., Breuer, U., Borodin, D., Clever, M., Ding, R., Galonska, A., Huber, A., Litnovsky, A., Matveev, D., Ohya, K., Philipps, V., Samm, U., ... Stoschus, H. (2011). Deposition and re-erosion studies by means of local impurity injection in TEXTOR. Journal of Nuclear Materials, 415(1 SUPPL), S239-S245. https://doi.org/10.1016/j.jnucmat.2010.10.058

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title = "Deposition and re-erosion studies by means of local impurity injection in TEXTOR",

abstract = "Pioneering experiments to study local erosion and deposition processes have been carried out in TEXTOR by injecting 13C marked hydrocarbons (CH4 and C2H4) as well as silane (SiD 4) and tungsten-hexafluoride (WF6) through test limiters exposed to the edge plasma. The influence of various limiter materials (C, W, Mo) and surface roughness, different geometries (spherical or roof-like) and local plasma parameters has been studied. Depending on these conditions the local deposition efficiency of injected species varies between 0.1% and 9% - the largest deposition has been found for 13CH4 injection through unpolished, spherical C test limiter and ohmic plasma conditions. The most striking result is that ERO modelling cannot reproduce these low deposition efficiencies using the common assumptions on sticking probabilities and physical and chemical re-erosion yields. As an explanation large re-erosion due to background plasma and possibly low {"}effective sticking{"} of returning species is applied. This has been interpreted as enhanced re-erosion of re-deposits under simultaneous impact of high ion fluxes from plasma background.",

author = "A. Kirschner and A. Kreter and P. Wienhold and S. Brezinsek and Coenen, {J. W.} and Esser, {H. G.} and A. Pospieszczyk and Ch Schulz and U. Breuer and D. Borodin and M. Clever and R. Ding and A. Galonska and A. Huber and A. Litnovsky and D. Matveev and K. Ohya and V. Philipps and U. Samm and O. Schmitz and B. Schweer and H. Stoschus",

note = "Funding Information: This work, supported by the European Communities under the contract of Association between EURATOM/FZJ, was carried out within the framework of EFDA. The views and opinions expressed herein do not necessarily reflect those of the European Commission. CPU time for computations has been provided by JSC (J{\"u}lich Supercomputer Centre). ",

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doi = "10.1016/j.jnucmat.2010.10.058",

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Kirschner, A, Kreter, A, Wienhold, P, Brezinsek, S, Coenen, JW, Esser, HG, Pospieszczyk, A, Schulz, C, Breuer, U, Borodin, D, Clever, M, Ding, R, Galonska, A, Huber, A, Litnovsky, A, Matveev, D, Ohya, K, Philipps, V, Samm, U, Schmitz, O, Schweer, B & Stoschus, H 2011, 'Deposition and re-erosion studies by means of local impurity injection in TEXTOR', Journal of Nuclear Materials, vol. 415, no. 1 SUPPL, pp. S239-S245. https://doi.org/10.1016/j.jnucmat.2010.10.058

TY - JOUR

T1 - Deposition and re-erosion studies by means of local impurity injection in TEXTOR

AU - Kirschner, A.

AU - Kreter, A.

AU - Wienhold, P.

AU - Brezinsek, S.

AU - Coenen, J. W.

AU - Esser, H. G.

AU - Pospieszczyk, A.

AU - Schulz, Ch

AU - Breuer, U.

AU - Borodin, D.

AU - Clever, M.

AU - Ding, R.

AU - Galonska, A.

AU - Huber, A.

AU - Litnovsky, A.

AU - Matveev, D.

AU - Ohya, K.

AU - Philipps, V.

AU - Samm, U.

AU - Schmitz, O.

AU - Schweer, B.

AU - Stoschus, H.

N1 - Funding Information: This work, supported by the European Communities under the contract of Association between EURATOM/FZJ, was carried out within the framework of EFDA. The views and opinions expressed herein do not necessarily reflect those of the European Commission. CPU time for computations has been provided by JSC (Jülich Supercomputer Centre).

PY - 2011/8/1

Y1 - 2011/8/1

N2 - Pioneering experiments to study local erosion and deposition processes have been carried out in TEXTOR by injecting 13C marked hydrocarbons (CH4 and C2H4) as well as silane (SiD 4) and tungsten-hexafluoride (WF6) through test limiters exposed to the edge plasma. The influence of various limiter materials (C, W, Mo) and surface roughness, different geometries (spherical or roof-like) and local plasma parameters has been studied. Depending on these conditions the local deposition efficiency of injected species varies between 0.1% and 9% - the largest deposition has been found for 13CH4 injection through unpolished, spherical C test limiter and ohmic plasma conditions. The most striking result is that ERO modelling cannot reproduce these low deposition efficiencies using the common assumptions on sticking probabilities and physical and chemical re-erosion yields. As an explanation large re-erosion due to background plasma and possibly low "effective sticking" of returning species is applied. This has been interpreted as enhanced re-erosion of re-deposits under simultaneous impact of high ion fluxes from plasma background.

AB - Pioneering experiments to study local erosion and deposition processes have been carried out in TEXTOR by injecting 13C marked hydrocarbons (CH4 and C2H4) as well as silane (SiD 4) and tungsten-hexafluoride (WF6) through test limiters exposed to the edge plasma. The influence of various limiter materials (C, W, Mo) and surface roughness, different geometries (spherical or roof-like) and local plasma parameters has been studied. Depending on these conditions the local deposition efficiency of injected species varies between 0.1% and 9% - the largest deposition has been found for 13CH4 injection through unpolished, spherical C test limiter and ohmic plasma conditions. The most striking result is that ERO modelling cannot reproduce these low deposition efficiencies using the common assumptions on sticking probabilities and physical and chemical re-erosion yields. As an explanation large re-erosion due to background plasma and possibly low "effective sticking" of returning species is applied. This has been interpreted as enhanced re-erosion of re-deposits under simultaneous impact of high ion fluxes from plasma background.

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JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1 SUPPL

ER -

Deposition and re-erosion studies by means of local impurity injection in TEXTOR

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