Overview of the results on divertor heat loads in RMP controlled H-mode plasmas on DIII-D

M. W. Jakubowski; T. E. Evans; M. E. Fenstermacher; M. Groth; C. J. Lasnier; A. W. Leonard; O. Schmitz; J. G. Watkins; T. Eich; W. Fundamenski; R. A. Moyer; R. C. Wolf; L. B. Baylor; J. A. Boedo; K. H. Burrell; H. Frerichs; J. S. Degrassie; P. Gohil; I. Joseph; S. Mordijck; M. Lehnen; C. C. Petty; R. I. Pinsker; D. Reiter; T. L. Rhodes; U. Samm; M. J. Schaffer; P. B. Snyder; H. Stoschus; T. Osborne; B. Unterberg; E. Unterberg; W. P. West

doi:10.1088/0029-5515/49/9/095013

Overview of the results on divertor heat loads in RMP controlled H-mode plasmas on DIII-D

M. W. Jakubowski, T. E. Evans, M. E. Fenstermacher, M. Groth, C. J. Lasnier, A. W. Leonard, O. Schmitz, J. G. Watkins, T. Eich, W. Fundamenski, R. A. Moyer, R. C. Wolf, L. B. Baylor, J. A. Boedo, K. H. Burrell, H. Frerichs, J. S. Degrassie, P. Gohil, I. Joseph, S. MordijckM. Lehnen, C. C. Petty, R. I. Pinsker, D. Reiter, T. L. Rhodes, U. Samm, M. J. Schaffer, P. B. Snyder, H. Stoschus, T. Osborne, B. Unterberg, E. Unterberg, W. P. West

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148 Scopus citations

Abstract

In this paper the manipulation of power deposition on divertor targets at DIII-D by the application of resonant magnetic perturbations (RMPs) for suppression of large type-I edge localized modes (ELMs) is analysed. We discuss the modification of the ELM characteristics by the RMP applied. It is shown that the width of the deposition pattern in ELMy H-mode depends linearly on the ELM deposited energy, whereas in the RMP phase of the discharge those patterns are controlled by the externally induced magnetic perturbation. It was also found that the manipulation of heat transport due to the application of small, edge RMP depends on the plasma pedestal electron collisionality . ν^* We compare in this analysis RMP and no RMP phases with and without complete ELM suppression. At high ν_e ^*> 0.5, the heat flux during the ELM suppressed phase is of the same order as the inter-ELM and the no-RMP phase. However, below this collisionality value, a slight increase in the total power flux to the divertor is observed during the RMP phase. This is most likely caused by a more negative potential at the divertor surface due to hot electrons reaching the divertor surface from the pedestal area along perturbed, open field lines.

Original language	English
Article number	095013
Journal	Nuclear Fusion
Volume	49
Issue number	9
DOIs	https://doi.org/10.1088/0029-5515/49/9/095013
State	Published - 2009
Externally published	Yes

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Jakubowski, M. W., Evans, T. E., Fenstermacher, M. E., Groth, M., Lasnier, C. J., Leonard, A. W., Schmitz, O., Watkins, J. G., Eich, T., Fundamenski, W., Moyer, R. A., Wolf, R. C., Baylor, L. B., Boedo, J. A., Burrell, K. H., Frerichs, H., Degrassie, J. S., Gohil, P., Joseph, I., ... West, W. P. (2009). Overview of the results on divertor heat loads in RMP controlled H-mode plasmas on DIII-D. Nuclear Fusion, 49(9), Article 095013. https://doi.org/10.1088/0029-5515/49/9/095013

@article{9e204aedf30645c4936beaeb7778d589,

title = "Overview of the results on divertor heat loads in RMP controlled H-mode plasmas on DIII-D",

abstract = "In this paper the manipulation of power deposition on divertor targets at DIII-D by the application of resonant magnetic perturbations (RMPs) for suppression of large type-I edge localized modes (ELMs) is analysed. We discuss the modification of the ELM characteristics by the RMP applied. It is shown that the width of the deposition pattern in ELMy H-mode depends linearly on the ELM deposited energy, whereas in the RMP phase of the discharge those patterns are controlled by the externally induced magnetic perturbation. It was also found that the manipulation of heat transport due to the application of small, edge RMP depends on the plasma pedestal electron collisionality . ν* We compare in this analysis RMP and no RMP phases with and without complete ELM suppression. At high νe *> 0.5, the heat flux during the ELM suppressed phase is of the same order as the inter-ELM and the no-RMP phase. However, below this collisionality value, a slight increase in the total power flux to the divertor is observed during the RMP phase. This is most likely caused by a more negative potential at the divertor surface due to hot electrons reaching the divertor surface from the pedestal area along perturbed, open field lines.",

author = "Jakubowski, {M. W.} and Evans, {T. E.} and Fenstermacher, {M. E.} and M. Groth and Lasnier, {C. J.} and Leonard, {A. W.} and O. Schmitz and Watkins, {J. G.} and T. Eich and W. Fundamenski and Moyer, {R. A.} and Wolf, {R. C.} and Baylor, {L. B.} and Boedo, {J. A.} and Burrell, {K. H.} and H. Frerichs and Degrassie, {J. S.} and P. Gohil and I. Joseph and S. Mordijck and M. Lehnen and Petty, {C. C.} and Pinsker, {R. I.} and D. Reiter and Rhodes, {T. L.} and U. Samm and Schaffer, {M. J.} and Snyder, {P. B.} and H. Stoschus and T. Osborne and B. Unterberg and E. Unterberg and West, {W. P.}",

year = "2009",

doi = "10.1088/0029-5515/49/9/095013",

language = "English",

volume = "49",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing",

number = "9",

}

Jakubowski, MW, Evans, TE, Fenstermacher, ME, Groth, M, Lasnier, CJ, Leonard, AW, Schmitz, O, Watkins, JG, Eich, T, Fundamenski, W, Moyer, RA, Wolf, RC, Baylor, LB, Boedo, JA, Burrell, KH, Frerichs, H, Degrassie, JS, Gohil, P, Joseph, I, Mordijck, S, Lehnen, M, Petty, CC, Pinsker, RI, Reiter, D, Rhodes, TL, Samm, U, Schaffer, MJ, Snyder, PB, Stoschus, H, Osborne, T, Unterberg, B, Unterberg, E & West, WP 2009, 'Overview of the results on divertor heat loads in RMP controlled H-mode plasmas on DIII-D', Nuclear Fusion, vol. 49, no. 9, 095013. https://doi.org/10.1088/0029-5515/49/9/095013

TY - JOUR

T1 - Overview of the results on divertor heat loads in RMP controlled H-mode plasmas on DIII-D

AU - Jakubowski, M. W.

AU - Evans, T. E.

AU - Fenstermacher, M. E.

AU - Groth, M.

AU - Lasnier, C. J.

AU - Leonard, A. W.

AU - Schmitz, O.

AU - Watkins, J. G.

AU - Eich, T.

AU - Fundamenski, W.

AU - Moyer, R. A.

AU - Wolf, R. C.

AU - Baylor, L. B.

AU - Boedo, J. A.

AU - Burrell, K. H.

AU - Frerichs, H.

AU - Degrassie, J. S.

AU - Gohil, P.

AU - Joseph, I.

AU - Mordijck, S.

AU - Lehnen, M.

AU - Petty, C. C.

AU - Pinsker, R. I.

AU - Reiter, D.

AU - Rhodes, T. L.

AU - Samm, U.

AU - Schaffer, M. J.

AU - Snyder, P. B.

AU - Stoschus, H.

AU - Osborne, T.

AU - Unterberg, B.

AU - Unterberg, E.

AU - West, W. P.

PY - 2009

Y1 - 2009

N2 - In this paper the manipulation of power deposition on divertor targets at DIII-D by the application of resonant magnetic perturbations (RMPs) for suppression of large type-I edge localized modes (ELMs) is analysed. We discuss the modification of the ELM characteristics by the RMP applied. It is shown that the width of the deposition pattern in ELMy H-mode depends linearly on the ELM deposited energy, whereas in the RMP phase of the discharge those patterns are controlled by the externally induced magnetic perturbation. It was also found that the manipulation of heat transport due to the application of small, edge RMP depends on the plasma pedestal electron collisionality . ν* We compare in this analysis RMP and no RMP phases with and without complete ELM suppression. At high νe *> 0.5, the heat flux during the ELM suppressed phase is of the same order as the inter-ELM and the no-RMP phase. However, below this collisionality value, a slight increase in the total power flux to the divertor is observed during the RMP phase. This is most likely caused by a more negative potential at the divertor surface due to hot electrons reaching the divertor surface from the pedestal area along perturbed, open field lines.

AB - In this paper the manipulation of power deposition on divertor targets at DIII-D by the application of resonant magnetic perturbations (RMPs) for suppression of large type-I edge localized modes (ELMs) is analysed. We discuss the modification of the ELM characteristics by the RMP applied. It is shown that the width of the deposition pattern in ELMy H-mode depends linearly on the ELM deposited energy, whereas in the RMP phase of the discharge those patterns are controlled by the externally induced magnetic perturbation. It was also found that the manipulation of heat transport due to the application of small, edge RMP depends on the plasma pedestal electron collisionality . ν* We compare in this analysis RMP and no RMP phases with and without complete ELM suppression. At high νe *> 0.5, the heat flux during the ELM suppressed phase is of the same order as the inter-ELM and the no-RMP phase. However, below this collisionality value, a slight increase in the total power flux to the divertor is observed during the RMP phase. This is most likely caused by a more negative potential at the divertor surface due to hot electrons reaching the divertor surface from the pedestal area along perturbed, open field lines.

UR - http://www.scopus.com/inward/record.url?scp=70349127328&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/49/9/095013

DO - 10.1088/0029-5515/49/9/095013

M3 - Article

AN - SCOPUS:70349127328

SN - 0029-5515

VL - 49

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 9

M1 - 095013

ER -

Overview of the results on divertor heat loads in RMP controlled H-mode plasmas on DIII-D

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