Quantification of chemical erosion in the DIII-D divertor and implications for ITER

A. G. McLean; P. C. Stangeby; B. D. Bray; S. Brezinsek; N. H. Brooks; J. W. Davis; R. C. Isler; A. Kirschner; R. Laengner; C. J. Lasnier; Y. Mu; J. Munoz; D. L. Rudakov; O. Schmitz; E. A. Unterberg; J. G. Watkins; D. G. Whyte; C. P.C. Wong

doi:10.1016/j.jnucmat.2011.01.044

Quantification of chemical erosion in the DIII-D divertor and implications for ITER

A. G. McLean, P. C. Stangeby, B. D. Bray, S. Brezinsek, N. H. Brooks, J. W. Davis, R. C. Isler, A. Kirschner, R. Laengner, C. J. Lasnier, Y. Mu, J. Munoz, D. L. Rudakov, O. Schmitz, E. A. Unterberg, J. G. Watkins, D. G. Whyte, C. P.C. Wong

Power Exhaust and Particle Control

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Abstract

The Porous Plug Injector (PPI) has proven to be an invaluable diagnostic for in situ characterization and quantification of erosion phenomena in DIII-D. Previous work has led to derivation of three primary figures of merit for chemical erosion (CE) in attached and cold divertor conditions: relative intensity of C⁺ chemical and physical sources, the CE yield (Y _chem), and effective photon efficiencies for chemically eroded products. Application of these figures for accounting of observed absolutely calibrated CI and CII emission intensities is demonstrated to produce a self-consistent solution at the DIII-D targets. Reinterpretation of the CI (C⁰) spectral lineshape profile supports the relative roles of local chemical versus physical sputtering as previously determined for CII (C ⁺). Comparison of calculated in situ Y_chem to that measured ex situ suggests a tokamak-specific lower energy threshold for CE and has potentially major implications for prediction of tritium co-deposition near the divertor targets in ITER.

Original language	English
Pages (from-to)	S141-S144
Journal	Journal of Nuclear Materials
Volume	415
Issue number	1 SUPPL
DOIs	https://doi.org/10.1016/j.jnucmat.2011.01.044
State	Published - Aug 1 2011

Funding

The authors would like to acknowledge the support of a Collaborative Research Opportunities Grant from the Natural Sciences and Engineering Research Council of Canada and the US Department of Energy. This work supported by the US Department of Energy under DE-AC05-00OR22725, DE-AC52-07NA27344, DE-FG02-07ER54917, DE-FC02-04ER54698, DE-AC04-94AL85000, and DE-FG02-04ER54767.

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McLean, A. G., Stangeby, P. C., Bray, B. D., Brezinsek, S., Brooks, N. H., Davis, J. W., Isler, R. C., Kirschner, A., Laengner, R., Lasnier, C. J., Mu, Y., Munoz, J., Rudakov, D. L., Schmitz, O., Unterberg, E. A., Watkins, J. G., Whyte, D. G., & Wong, C. P. C. (2011). Quantification of chemical erosion in the DIII-D divertor and implications for ITER. Journal of Nuclear Materials, 415(1 SUPPL), S141-S144. https://doi.org/10.1016/j.jnucmat.2011.01.044

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title = "Quantification of chemical erosion in the DIII-D divertor and implications for ITER",

abstract = "The Porous Plug Injector (PPI) has proven to be an invaluable diagnostic for in situ characterization and quantification of erosion phenomena in DIII-D. Previous work has led to derivation of three primary figures of merit for chemical erosion (CE) in attached and cold divertor conditions: relative intensity of C+ chemical and physical sources, the CE yield (Y chem), and effective photon efficiencies for chemically eroded products. Application of these figures for accounting of observed absolutely calibrated CI and CII emission intensities is demonstrated to produce a self-consistent solution at the DIII-D targets. Reinterpretation of the CI (C0) spectral lineshape profile supports the relative roles of local chemical versus physical sputtering as previously determined for CII (C +). Comparison of calculated in situ Ychem to that measured ex situ suggests a tokamak-specific lower energy threshold for CE and has potentially major implications for prediction of tritium co-deposition near the divertor targets in ITER.",

author = "McLean, {A. G.} and Stangeby, {P. C.} and Bray, {B. D.} and S. Brezinsek and Brooks, {N. H.} and Davis, {J. W.} and Isler, {R. C.} and A. Kirschner and R. Laengner and Lasnier, {C. J.} and Y. Mu and J. Munoz and Rudakov, {D. L.} and O. Schmitz and Unterberg, {E. A.} and Watkins, {J. G.} and Whyte, {D. G.} and Wong, {C. P.C.}",

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McLean, AG, Stangeby, PC, Bray, BD, Brezinsek, S, Brooks, NH, Davis, JW, Isler, RC, Kirschner, A, Laengner, R, Lasnier, CJ, Mu, Y, Munoz, J, Rudakov, DL, Schmitz, O, Unterberg, EA, Watkins, JG, Whyte, DG & Wong, CPC 2011, 'Quantification of chemical erosion in the DIII-D divertor and implications for ITER', Journal of Nuclear Materials, vol. 415, no. 1 SUPPL, pp. S141-S144. https://doi.org/10.1016/j.jnucmat.2011.01.044

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T1 - Quantification of chemical erosion in the DIII-D divertor and implications for ITER

AU - McLean, A. G.

AU - Stangeby, P. C.

AU - Bray, B. D.

AU - Brezinsek, S.

AU - Brooks, N. H.

AU - Davis, J. W.

AU - Isler, R. C.

AU - Kirschner, A.

AU - Laengner, R.

AU - Lasnier, C. J.

AU - Mu, Y.

AU - Munoz, J.

AU - Rudakov, D. L.

AU - Schmitz, O.

AU - Unterberg, E. A.

AU - Watkins, J. G.

AU - Whyte, D. G.

AU - Wong, C. P.C.

PY - 2011/8/1

Y1 - 2011/8/1

N2 - The Porous Plug Injector (PPI) has proven to be an invaluable diagnostic for in situ characterization and quantification of erosion phenomena in DIII-D. Previous work has led to derivation of three primary figures of merit for chemical erosion (CE) in attached and cold divertor conditions: relative intensity of C+ chemical and physical sources, the CE yield (Y chem), and effective photon efficiencies for chemically eroded products. Application of these figures for accounting of observed absolutely calibrated CI and CII emission intensities is demonstrated to produce a self-consistent solution at the DIII-D targets. Reinterpretation of the CI (C0) spectral lineshape profile supports the relative roles of local chemical versus physical sputtering as previously determined for CII (C +). Comparison of calculated in situ Ychem to that measured ex situ suggests a tokamak-specific lower energy threshold for CE and has potentially major implications for prediction of tritium co-deposition near the divertor targets in ITER.

AB - The Porous Plug Injector (PPI) has proven to be an invaluable diagnostic for in situ characterization and quantification of erosion phenomena in DIII-D. Previous work has led to derivation of three primary figures of merit for chemical erosion (CE) in attached and cold divertor conditions: relative intensity of C+ chemical and physical sources, the CE yield (Y chem), and effective photon efficiencies for chemically eroded products. Application of these figures for accounting of observed absolutely calibrated CI and CII emission intensities is demonstrated to produce a self-consistent solution at the DIII-D targets. Reinterpretation of the CI (C0) spectral lineshape profile supports the relative roles of local chemical versus physical sputtering as previously determined for CII (C +). Comparison of calculated in situ Ychem to that measured ex situ suggests a tokamak-specific lower energy threshold for CE and has potentially major implications for prediction of tritium co-deposition near the divertor targets in ITER.

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JO - Journal of Nuclear Materials

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IS - 1 SUPPL

ER -

Quantification of chemical erosion in the DIII-D divertor and implications for ITER

Abstract

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