Attainment of high confinement in neutral beam heated divertor discharges in the PDX tokamak

S. M. Kaye; M. G. Bell; K. Bol; D. Boyd; K. Brau; D. Buchenauer; R. Budny; A. Cavallo; P. Couture; T. Crowley; D. S. Darrow; H. Eubank; R. J. Fonck; Robert James Goldston; B. Grek; K. P. Jaehnig; D. Johnson; R. Kaita; H. Kugel; B. Leblanc; J. Manickam; D. Manos; D. Mansfield; E. Mazzucato; R. McCann; D. McCune; K. McGuire; D. Mueller; A. Murdock; M. Okabayashi; K. Okano; D. K. Owens; D. E. Post; M. Reusch; G. L. Schmidt; S. Sesnic; R. Slusher; S. Suckewer; C. Surko; H. Takahashi; F. Tenney; H. Towner; J. Valley

doi:10.1016/0022-3115(84)90111-9

Attainment of high confinement in neutral beam heated divertor discharges in the PDX tokamak

S. M. Kaye, M. G. Bell, K. Bol, D. Boyd, K. Brau, D. Buchenauer, R. Budny, A. Cavallo, P. Couture, T. Crowley, D. S. Darrow, H. Eubank, R. J. Fonck, Robert James Goldston, B. Grek, K. P. Jaehnig, D. Johnson, R. Kaita, H. Kugel, B. LeblancJ. Manickam, D. Manos, D. Mansfield, E. Mazzucato, R. McCann, D. McCune, K. McGuire, D. Mueller, A. Murdock, M. Okabayashi, K. Okano, D. K. Owens, D. E. Post, M. Reusch, G. L. Schmidt, S. Sesnic, R. Slusher, S. Suckewer, C. Surko, H. Takahashi, F. Tenney, H. Towner, J. Valley

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Abstract

The PDX divertor configuration has recently been converted from an open to a closed geometry to inhibit the return of neutral gas from the divertor region to the main chamber. Since then, operation in a regime with high energy confinement in neutral beam heated discharges (ASDEX H-mode) has been routine over a wide range of operating conditions. These H-mode discharges are characterized by a sudden drop in divertor density and H_α emission and a spontaneous rise in main chamber plasma density during neutral beam injection. The confinement time is found to scale nearly linearly with plasma current, but can be degraded due either to the presence of edge instabilities or heavy gas puffing. Detailed Thomson scattering temperature profiles show high values of T_c near the plasma edge (∼ 450 eV) with sharp radial gradients (∼ 400 eV/cm) near the separatrix. Density profiles are broad and also exhibit steep gradients close to the separatrix.

Original language	English (US)
Pages (from-to)	115-125
Number of pages	11
Journal	Journal of Nuclear Materials
Volume	121
Issue number	C
DOIs	https://doi.org/10.1016/0022-3115(84)90111-9
State	Published - May 1 1984

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
General Materials Science
Nuclear Energy and Engineering

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10.1016/0022-3115(84)90111-9

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Kaye, S. M., Bell, M. G., Bol, K., Boyd, D., Brau, K., Buchenauer, D., Budny, R., Cavallo, A., Couture, P., Crowley, T., Darrow, D. S., Eubank, H., Fonck, R. J., Goldston, R. J., Grek, B., Jaehnig, K. P., Johnson, D., Kaita, R., Kugel, H., ... Valley, J. (1984). Attainment of high confinement in neutral beam heated divertor discharges in the PDX tokamak. Journal of Nuclear Materials, 121(C), 115-125. https://doi.org/10.1016/0022-3115(84)90111-9

@article{363ec537b6a649ed99486abe3127f35d,

title = "Attainment of high confinement in neutral beam heated divertor discharges in the PDX tokamak",

abstract = "The PDX divertor configuration has recently been converted from an open to a closed geometry to inhibit the return of neutral gas from the divertor region to the main chamber. Since then, operation in a regime with high energy confinement in neutral beam heated discharges (ASDEX H-mode) has been routine over a wide range of operating conditions. These H-mode discharges are characterized by a sudden drop in divertor density and Hα emission and a spontaneous rise in main chamber plasma density during neutral beam injection. The confinement time is found to scale nearly linearly with plasma current, but can be degraded due either to the presence of edge instabilities or heavy gas puffing. Detailed Thomson scattering temperature profiles show high values of Tc near the plasma edge (∼ 450 eV) with sharp radial gradients (∼ 400 eV/cm) near the separatrix. Density profiles are broad and also exhibit steep gradients close to the separatrix.",

author = "Kaye, {S. M.} and Bell, {M. G.} and K. Bol and D. Boyd and K. Brau and D. Buchenauer and R. Budny and A. Cavallo and P. Couture and T. Crowley and Darrow, {D. S.} and H. Eubank and Fonck, {R. J.} and Goldston, {Robert James} and B. Grek and Jaehnig, {K. P.} and D. Johnson and R. Kaita and H. Kugel and B. Leblanc and J. Manickam and D. Manos and D. Mansfield and E. Mazzucato and R. McCann and D. McCune and K. McGuire and D. Mueller and A. Murdock and M. Okabayashi and K. Okano and Owens, {D. K.} and Post, {D. E.} and M. Reusch and Schmidt, {G. L.} and S. Sesnic and R. Slusher and S. Suckewer and C. Surko and H. Takahashi and F. Tenney and H. Towner and J. Valley",

year = "1984",

month = may,

day = "1",

doi = "10.1016/0022-3115(84)90111-9",

language = "English (US)",

volume = "121",

pages = "115--125",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

number = "C",

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Kaye, SM, Bell, MG, Bol, K, Boyd, D, Brau, K, Buchenauer, D, Budny, R, Cavallo, A, Couture, P, Crowley, T, Darrow, DS, Eubank, H, Fonck, RJ, Goldston, RJ, Grek, B, Jaehnig, KP, Johnson, D, Kaita, R, Kugel, H, Leblanc, B, Manickam, J, Manos, D, Mansfield, D, Mazzucato, E, McCann, R, McCune, D, McGuire, K, Mueller, D, Murdock, A, Okabayashi, M, Okano, K, Owens, DK, Post, DE, Reusch, M, Schmidt, GL, Sesnic, S, Slusher, R, Suckewer, S, Surko, C, Takahashi, H, Tenney, F, Towner, H & Valley, J 1984, 'Attainment of high confinement in neutral beam heated divertor discharges in the PDX tokamak', Journal of Nuclear Materials, vol. 121, no. C, pp. 115-125. https://doi.org/10.1016/0022-3115(84)90111-9

TY - JOUR

T1 - Attainment of high confinement in neutral beam heated divertor discharges in the PDX tokamak

AU - Kaye, S. M.

AU - Bell, M. G.

AU - Bol, K.

AU - Boyd, D.

AU - Brau, K.

AU - Buchenauer, D.

AU - Budny, R.

AU - Cavallo, A.

AU - Couture, P.

AU - Crowley, T.

AU - Darrow, D. S.

AU - Eubank, H.

AU - Fonck, R. J.

AU - Goldston, Robert James

AU - Grek, B.

AU - Jaehnig, K. P.

AU - Johnson, D.

AU - Kaita, R.

AU - Kugel, H.

AU - Leblanc, B.

AU - Manickam, J.

AU - Manos, D.

AU - Mansfield, D.

AU - Mazzucato, E.

AU - McCann, R.

AU - McCune, D.

AU - McGuire, K.

AU - Mueller, D.

AU - Murdock, A.

AU - Okabayashi, M.

AU - Okano, K.

AU - Owens, D. K.

AU - Post, D. E.

AU - Reusch, M.

AU - Schmidt, G. L.

AU - Sesnic, S.

AU - Slusher, R.

AU - Suckewer, S.

AU - Surko, C.

AU - Takahashi, H.

AU - Tenney, F.

AU - Towner, H.

AU - Valley, J.

PY - 1984/5/1

Y1 - 1984/5/1

N2 - The PDX divertor configuration has recently been converted from an open to a closed geometry to inhibit the return of neutral gas from the divertor region to the main chamber. Since then, operation in a regime with high energy confinement in neutral beam heated discharges (ASDEX H-mode) has been routine over a wide range of operating conditions. These H-mode discharges are characterized by a sudden drop in divertor density and Hα emission and a spontaneous rise in main chamber plasma density during neutral beam injection. The confinement time is found to scale nearly linearly with plasma current, but can be degraded due either to the presence of edge instabilities or heavy gas puffing. Detailed Thomson scattering temperature profiles show high values of Tc near the plasma edge (∼ 450 eV) with sharp radial gradients (∼ 400 eV/cm) near the separatrix. Density profiles are broad and also exhibit steep gradients close to the separatrix.

AB - The PDX divertor configuration has recently been converted from an open to a closed geometry to inhibit the return of neutral gas from the divertor region to the main chamber. Since then, operation in a regime with high energy confinement in neutral beam heated discharges (ASDEX H-mode) has been routine over a wide range of operating conditions. These H-mode discharges are characterized by a sudden drop in divertor density and Hα emission and a spontaneous rise in main chamber plasma density during neutral beam injection. The confinement time is found to scale nearly linearly with plasma current, but can be degraded due either to the presence of edge instabilities or heavy gas puffing. Detailed Thomson scattering temperature profiles show high values of Tc near the plasma edge (∼ 450 eV) with sharp radial gradients (∼ 400 eV/cm) near the separatrix. Density profiles are broad and also exhibit steep gradients close to the separatrix.

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U2 - 10.1016/0022-3115(84)90111-9

DO - 10.1016/0022-3115(84)90111-9

M3 - Article

AN - SCOPUS:0020753248

SN - 0022-3115

VL - 121

SP - 115

EP - 125

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - C

ER -

Attainment of high confinement in neutral beam heated divertor discharges in the PDX tokamak

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