Improved core fueling with high field side pellet injection in the DIII-D tokamak

L. R. Baylor; T. C. Jernigan; S. K. Combs; W. A. Houlberg; M. Murakami; P. Gohil; K. H. Burrell; C. M. Greenfield; R. J. Groebner; C. L. Hsieh; R. J. La Haye; P. B. Parks; G. M. Staebler; G. L. Schmidt; D. R. Ernst; E. J. Synakowski; M. Porkolab

doi:10.1063/1.874011

Improved core fueling with high field side pellet injection in the DIII-D tokamak

L. R. Baylor, T. C. Jernigan, S. K. Combs, W. A. Houlberg, M. Murakami, P. Gohil, K. H. Burrell, C. M. Greenfield, R. J. Groebner, C. L. Hsieh, R. J. La Haye, P. B. Parks, G. M. Staebler, G. L. Schmidt, D. R. Ernst, E. J. Synakowski, M. Porkolab

Fusion Energy Division

Research output: Contribution to journal › Conference article › peer-review

131 Scopus citations

Abstract

The capability to inject deuterium pellets from the magnetic high field side (HFS) has been added to the DIII-D tokamak [J. L. Luxon and L. G. Davis, Fusion Technol. 8, 441 (1985)]. It is observed that pellets injected from the HFS lead to deeper mass deposition than identical pellets injected from the outside midplane, in spite of a factor of 4 lower pellet speed. HFS injected pellets have been used to generate peaked density profile plasmas [peaking factor (n_e(0)/〈ne〉) in excess of 3] that develop internal transport barriers when centrally heated with neutral beam injection. The transport barriers are formed in conditions where T_e∼T_j and q(0) is above unity. The peaked density profiles, characteristic of the internal transport barrier, persist for several energy confinement times. The pellets are also used to investigate transport barrier physics and modify plasma edge conditions. Transitions from L- to H-mode have been triggered by pellets, effectively lowering the H-mode threshold power by 2.4 MW. Pellets injected into H-mode plasmas are found to trigger edge localized modes (ELMs). ELMs triggered from the low field side (LFS) outside midplane injected pellets are of significantly longer duration than from HFS injected pellets.

Original language	English
Pages (from-to)	1878-1885
Number of pages	8
Journal	Physics of Plasmas
Volume	7
Issue number	5 II
DOIs	https://doi.org/10.1063/1.874011
State	Published - May 2000
Event	41st Annual Meeting of the Division of Plasma Physics of the Ameircan Physical Society - Seattle, WA, United States Duration: Nov 15 1999 → Nov 19 1999

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Baylor, L. R., Jernigan, T. C., Combs, S. K., Houlberg, W. A., Murakami, M., Gohil, P., Burrell, K. H., Greenfield, C. M., Groebner, R. J., Hsieh, C. L., La Haye, R. J., Parks, P. B., Staebler, G. M., Schmidt, G. L., Ernst, D. R., Synakowski, E. J., & Porkolab, M. (2000). Improved core fueling with high field side pellet injection in the DIII-D tokamak. Physics of Plasmas, 7(5 II), 1878-1885. https://doi.org/10.1063/1.874011

@article{ee85a9d5106544a0862ed2b3118cdc74,

title = "Improved core fueling with high field side pellet injection in the DIII-D tokamak",

abstract = "The capability to inject deuterium pellets from the magnetic high field side (HFS) has been added to the DIII-D tokamak [J. L. Luxon and L. G. Davis, Fusion Technol. 8, 441 (1985)]. It is observed that pellets injected from the HFS lead to deeper mass deposition than identical pellets injected from the outside midplane, in spite of a factor of 4 lower pellet speed. HFS injected pellets have been used to generate peaked density profile plasmas [peaking factor (ne(0)/〈ne〉) in excess of 3] that develop internal transport barriers when centrally heated with neutral beam injection. The transport barriers are formed in conditions where Te∼Tj and q(0) is above unity. The peaked density profiles, characteristic of the internal transport barrier, persist for several energy confinement times. The pellets are also used to investigate transport barrier physics and modify plasma edge conditions. Transitions from L- to H-mode have been triggered by pellets, effectively lowering the H-mode threshold power by 2.4 MW. Pellets injected into H-mode plasmas are found to trigger edge localized modes (ELMs). ELMs triggered from the low field side (LFS) outside midplane injected pellets are of significantly longer duration than from HFS injected pellets.",

author = "Baylor, {L. R.} and Jernigan, {T. C.} and Combs, {S. K.} and Houlberg, {W. A.} and M. Murakami and P. Gohil and Burrell, {K. H.} and Greenfield, {C. M.} and Groebner, {R. J.} and Hsieh, {C. L.} and {La Haye}, {R. J.} and Parks, {P. B.} and Staebler, {G. M.} and Schmidt, {G. L.} and Ernst, {D. R.} and Synakowski, {E. J.} and M. Porkolab",

year = "2000",

month = may,

doi = "10.1063/1.874011",

language = "English",

volume = "7",

pages = "1878--1885",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "5 II",

note = "41st Annual Meeting of the Division of Plasma Physics of the Ameircan Physical Society ; Conference date: 15-11-1999 Through 19-11-1999",

}

Baylor, LR, Jernigan, TC, Combs, SK, Houlberg, WA, Murakami, M, Gohil, P, Burrell, KH, Greenfield, CM, Groebner, RJ, Hsieh, CL, La Haye, RJ, Parks, PB, Staebler, GM, Schmidt, GL, Ernst, DR, Synakowski, EJ & Porkolab, M 2000, 'Improved core fueling with high field side pellet injection in the DIII-D tokamak', Physics of Plasmas, vol. 7, no. 5 II, pp. 1878-1885. https://doi.org/10.1063/1.874011

TY - JOUR

T1 - Improved core fueling with high field side pellet injection in the DIII-D tokamak

AU - Baylor, L. R.

AU - Jernigan, T. C.

AU - Combs, S. K.

AU - Houlberg, W. A.

AU - Murakami, M.

AU - Gohil, P.

AU - Burrell, K. H.

AU - Greenfield, C. M.

AU - Groebner, R. J.

AU - Hsieh, C. L.

AU - La Haye, R. J.

AU - Parks, P. B.

AU - Staebler, G. M.

AU - Schmidt, G. L.

AU - Ernst, D. R.

AU - Synakowski, E. J.

AU - Porkolab, M.

PY - 2000/5

Y1 - 2000/5

N2 - The capability to inject deuterium pellets from the magnetic high field side (HFS) has been added to the DIII-D tokamak [J. L. Luxon and L. G. Davis, Fusion Technol. 8, 441 (1985)]. It is observed that pellets injected from the HFS lead to deeper mass deposition than identical pellets injected from the outside midplane, in spite of a factor of 4 lower pellet speed. HFS injected pellets have been used to generate peaked density profile plasmas [peaking factor (ne(0)/〈ne〉) in excess of 3] that develop internal transport barriers when centrally heated with neutral beam injection. The transport barriers are formed in conditions where Te∼Tj and q(0) is above unity. The peaked density profiles, characteristic of the internal transport barrier, persist for several energy confinement times. The pellets are also used to investigate transport barrier physics and modify plasma edge conditions. Transitions from L- to H-mode have been triggered by pellets, effectively lowering the H-mode threshold power by 2.4 MW. Pellets injected into H-mode plasmas are found to trigger edge localized modes (ELMs). ELMs triggered from the low field side (LFS) outside midplane injected pellets are of significantly longer duration than from HFS injected pellets.

AB - The capability to inject deuterium pellets from the magnetic high field side (HFS) has been added to the DIII-D tokamak [J. L. Luxon and L. G. Davis, Fusion Technol. 8, 441 (1985)]. It is observed that pellets injected from the HFS lead to deeper mass deposition than identical pellets injected from the outside midplane, in spite of a factor of 4 lower pellet speed. HFS injected pellets have been used to generate peaked density profile plasmas [peaking factor (ne(0)/〈ne〉) in excess of 3] that develop internal transport barriers when centrally heated with neutral beam injection. The transport barriers are formed in conditions where Te∼Tj and q(0) is above unity. The peaked density profiles, characteristic of the internal transport barrier, persist for several energy confinement times. The pellets are also used to investigate transport barrier physics and modify plasma edge conditions. Transitions from L- to H-mode have been triggered by pellets, effectively lowering the H-mode threshold power by 2.4 MW. Pellets injected into H-mode plasmas are found to trigger edge localized modes (ELMs). ELMs triggered from the low field side (LFS) outside midplane injected pellets are of significantly longer duration than from HFS injected pellets.

UR - http://www.scopus.com/inward/record.url?scp=0012843420&partnerID=8YFLogxK

U2 - 10.1063/1.874011

DO - 10.1063/1.874011

M3 - Conference article

AN - SCOPUS:0012843420

SN - 1070-664X

VL - 7

SP - 1878

EP - 1885

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5 II

T2 - 41st Annual Meeting of the Division of Plasma Physics of the Ameircan Physical Society

Y2 - 15 November 1999 through 19 November 1999

ER -

Improved core fueling with high field side pellet injection in the DIII-D tokamak

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