Effect of separatrix magnetic geometry on divertor behavior in DIII-D

T. W. Petrie; J. M. Canik; C. J. Lasnier; A. W. Leonard; M. A. Mahdavi; J. G. Watkins; M. E. Fenstermacher; J. R. Ferron; R. J. Groebner; D. N. Hill; A. W. Hyatt; C. T. Holcomb; T. C. Luce; R. A. Moyer; P. C. Stangeby

doi:10.1016/j.jnucmat.2013.01.051

Effect of separatrix magnetic geometry on divertor behavior in DIII-D

T. W. Petrie, J. M. Canik, C. J. Lasnier, A. W. Leonard, M. A. Mahdavi, J. G. Watkins, M. E. Fenstermacher, J. R. Ferron, R. J. Groebner, D. N. Hill, A. W. Hyatt, C. T. Holcomb, T. C. Luce, R. A. Moyer, P. C. Stangeby

Fusion Energy Division

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Abstract

We report on recent experiments on DIII-D that examined the effects that variations in the parallel connection length in the scrape-off layer (SOL), L_∥, and the radial location of the outer divertor target, RTAR, have on divertor plasma properties. Two-point modeling of the SOL plasma predicts that larger values of L_∥ and R_TAR should lower temperature and raise density at the outer divertor target for fixed upstream separatrix density and temperature, i.e., n_TAR ∝ [R_TAR]²[L_∥]⁶/⁷ and T_TAR ∝ [R_TAR] ²[L_∥] ⁴/⁷. The dependence of n_TAR and T_TAR on L_∥ was consistent with our data, but the dependence of n _TAR and T_TAR on R_TAR was not. The surprising result that the divertor plasma parameters did not depend on R_TAR in the predicted way may be due to convected heat flux, driven by escaping neutrals, in the more open configuration of the larger R_TAR cases. Modeling results using the SOLPS code support this postulate.

Original language	English
Pages (from-to)	S166-S169
Journal	Journal of Nuclear Materials
Volume	438
Issue number	SUPPL
DOIs	https://doi.org/10.1016/j.jnucmat.2013.01.051
State	Published - 2013

Funding

This work was supported by the U.S. Department of Energy under DE-FC02-04ER54698, DE-AC05-00OR22725, DE-AC52-07NA27344, DE-AC04-94AL85000, DE-FG02-07ER54917, and DE-FG02-05ER54809 .

Funders	Funder number
U.S. Department of Energy	DE-AC05-00OR22725, DE-FG02-05ER54809, DE-AC04-94AL85000, DE-FC02-04ER54698, DE-AC52-07NA27344, DE-FG02-07ER54917

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10.1016/j.jnucmat.2013.01.051

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Petrie, T. W., Canik, J. M., Lasnier, C. J., Leonard, A. W., Mahdavi, M. A., Watkins, J. G., Fenstermacher, M. E., Ferron, J. R., Groebner, R. J., Hill, D. N., Hyatt, A. W., Holcomb, C. T., Luce, T. C., Moyer, R. A., & Stangeby, P. C. (2013). Effect of separatrix magnetic geometry on divertor behavior in DIII-D. Journal of Nuclear Materials, 438(SUPPL), S166-S169. https://doi.org/10.1016/j.jnucmat.2013.01.051

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title = "Effect of separatrix magnetic geometry on divertor behavior in DIII-D",

abstract = "We report on recent experiments on DIII-D that examined the effects that variations in the parallel connection length in the scrape-off layer (SOL), L∥, and the radial location of the outer divertor target, RTAR, have on divertor plasma properties. Two-point modeling of the SOL plasma predicts that larger values of L∥ and RTAR should lower temperature and raise density at the outer divertor target for fixed upstream separatrix density and temperature, i.e., nTAR ∝ [RTAR]2[L∥]6/7 and TTAR ∝ [RTAR] 2[L∥] 4/7. The dependence of nTAR and TTAR on L∥ was consistent with our data, but the dependence of n TAR and TTAR on RTAR was not. The surprising result that the divertor plasma parameters did not depend on RTAR in the predicted way may be due to convected heat flux, driven by escaping neutrals, in the more open configuration of the larger RTAR cases. Modeling results using the SOLPS code support this postulate.",

author = "Petrie, {T. W.} and Canik, {J. M.} and Lasnier, {C. J.} and Leonard, {A. W.} and Mahdavi, {M. A.} and Watkins, {J. G.} and Fenstermacher, {M. E.} and Ferron, {J. R.} and Groebner, {R. J.} and Hill, {D. N.} and Hyatt, {A. W.} and Holcomb, {C. T.} and Luce, {T. C.} and Moyer, {R. A.} and Stangeby, {P. C.}",

year = "2013",

doi = "10.1016/j.jnucmat.2013.01.051",

language = "English",

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pages = "S166--S169",

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Petrie, TW, Canik, JM, Lasnier, CJ, Leonard, AW, Mahdavi, MA, Watkins, JG, Fenstermacher, ME, Ferron, JR, Groebner, RJ, Hill, DN, Hyatt, AW, Holcomb, CT, Luce, TC, Moyer, RA & Stangeby, PC 2013, 'Effect of separatrix magnetic geometry on divertor behavior in DIII-D', Journal of Nuclear Materials, vol. 438, no. SUPPL, pp. S166-S169. https://doi.org/10.1016/j.jnucmat.2013.01.051

TY - JOUR

T1 - Effect of separatrix magnetic geometry on divertor behavior in DIII-D

AU - Petrie, T. W.

AU - Canik, J. M.

AU - Lasnier, C. J.

AU - Leonard, A. W.

AU - Mahdavi, M. A.

AU - Watkins, J. G.

AU - Fenstermacher, M. E.

AU - Ferron, J. R.

AU - Groebner, R. J.

AU - Hill, D. N.

AU - Hyatt, A. W.

AU - Holcomb, C. T.

AU - Luce, T. C.

AU - Moyer, R. A.

AU - Stangeby, P. C.

PY - 2013

Y1 - 2013

N2 - We report on recent experiments on DIII-D that examined the effects that variations in the parallel connection length in the scrape-off layer (SOL), L∥, and the radial location of the outer divertor target, RTAR, have on divertor plasma properties. Two-point modeling of the SOL plasma predicts that larger values of L∥ and RTAR should lower temperature and raise density at the outer divertor target for fixed upstream separatrix density and temperature, i.e., nTAR ∝ [RTAR]2[L∥]6/7 and TTAR ∝ [RTAR] 2[L∥] 4/7. The dependence of nTAR and TTAR on L∥ was consistent with our data, but the dependence of n TAR and TTAR on RTAR was not. The surprising result that the divertor plasma parameters did not depend on RTAR in the predicted way may be due to convected heat flux, driven by escaping neutrals, in the more open configuration of the larger RTAR cases. Modeling results using the SOLPS code support this postulate.

AB - We report on recent experiments on DIII-D that examined the effects that variations in the parallel connection length in the scrape-off layer (SOL), L∥, and the radial location of the outer divertor target, RTAR, have on divertor plasma properties. Two-point modeling of the SOL plasma predicts that larger values of L∥ and RTAR should lower temperature and raise density at the outer divertor target for fixed upstream separatrix density and temperature, i.e., nTAR ∝ [RTAR]2[L∥]6/7 and TTAR ∝ [RTAR] 2[L∥] 4/7. The dependence of nTAR and TTAR on L∥ was consistent with our data, but the dependence of n TAR and TTAR on RTAR was not. The surprising result that the divertor plasma parameters did not depend on RTAR in the predicted way may be due to convected heat flux, driven by escaping neutrals, in the more open configuration of the larger RTAR cases. Modeling results using the SOLPS code support this postulate.

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U2 - 10.1016/j.jnucmat.2013.01.051

DO - 10.1016/j.jnucmat.2013.01.051

M3 - Article

AN - SCOPUS:84885472962

SN - 0022-3115

VL - 438

SP - S166-S169

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - SUPPL

ER -

Effect of separatrix magnetic geometry on divertor behavior in DIII-D

Abstract

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