Search

Your search keyword '"Stallard, B.W."' showing total 44 results
Start Over Author "Stallard, B.W."
44 results on '"Stallard, B.W."'

7. Bank Upgrade for SSPX at LLNL

Author

Marchiano, M.M., primary, Cook, E.G., additional, Geer, R.W., additional, Kemptner, R.O., additional, McLean, H.S., additional, Martovetsky, N.N., additional, Moller, J.M., additional, Morris, K.L., additional, Stallard, B.W., additional, Watson, J.A., additional, and Wood, R.D., additional

Published
2005
Full Text
View/download PDF

8. Progress towards increased understanding and control of internal transport barriers in DIII-D

Author

Doyle, E.J, primary, Greenfield, C.M, additional, Austin, M.E, additional, Baylor, L.R, additional, Burrell, K.H, additional, Casper, T.A, additional, DeBoo, J.C, additional, Ernst, D.R, additional, Fenzi, C, additional, Gohil, P, additional, Groebner, R.J, additional, Heidbrink, W.W, additional, Jackson, G.L, additional, Jernigan, T.C, additional, Kinsey, J.E, additional, Lao, L.L, additional, Makowski, M, additional, McKee, G.R, additional, Murakami, M, additional, Peebles, W.A, additional, Porkolab, M, additional, Prater, R, additional, Rettig, C.L, additional, Rhodes, T.L, additional, Rost, J.C, additional, Staebler, G.M, additional, Stallard, B.W, additional, Strait, E.J, additional, Synakowski, E.J, additional, Thomas, D.M, additional, Wade, M.R, additional, Waltz, R.E, additional, and Zeng, L, additional

Published
2002
Full Text
View/download PDF

10. Astron Program final report

Author

Briggs, R.J., primary, Hester, R.E., additional, Porter, G.D., additional, Sherwood, W.A., additional, Spoerlein, R., additional, Stallard, B.W., additional, Taska, J., additional, and Weiss, P.B., additional

Published
1975
Full Text
View/download PDF

12. Behaviour of electron and ion transport in discharges with an internal transport barrier in the DIII-D tokamak

Author

Greenfield, C.M, primary, Rettig, C.L, additional, Staebler, G.M, additional, Stallard, B.W, additional, Austin, M.E, additional, Burrell, K.H, additional, DeBoo, J.C, additional, deGrassie, J.S, additional, Doyle, E.J, additional, Gohil, P, additional, Groebner, R.J, additional, Lohr, J, additional, McKee, G.R, additional, Peebles, W.A, additional, Petty, C.C, additional, Pinsker, R.I, additional, Rice, B.W, additional, Rhodes, T.L, additional, Synakowski, E.J, additional, Waltz, R.E, additional, and Zeng, L, additional

Published
1999
Full Text
View/download PDF

13. Progress towards sustainment of advanced tokamak modes in DIII-D

Author

Rice, B.W, primary, Burrell, K.H, additional, Ferron, J.R, additional, Greenfield, C.M, additional, Jackson, G.L, additional, Lao, L.L, additional, Haye, R.J. La, additional, Luce, T.C, additional, Stallard, B.W, additional, Strait, E.J, additional, Synakowski, E.J, additional, Taylor, T.S, additional, Turnbull, A.D, additional, and Wade, M.R, additional

Published
1999
Full Text
View/download PDF

14. Higher fusion power gain with profile control in DIII-D tokamak plasmas

Author

Lazarus, E.A, primary, Navratil, G.A, additional, Greenfield, C.M, additional, Strait, E.J, additional, Austin, M.E, additional, Burrell, K.H, additional, Casper, T.A, additional, Baker, D.R, additional, DeBoo, J.C, additional, Doyle, E.J, additional, Durst, R.D, additional, Ferron, J.R, additional, Forest, C.B, additional, Gohil, P, additional, Groebner, R.J, additional, Heidbrink, W.W, additional, Hong, R, additional, Howald, A.W, additional, Hsieh, C.-L, additional, Hyatt, A.W, additional, Jackson, G.L, additional, Kim, J, additional, Lao, L.L, additional, Lanier, C.J, additional, Leonard, A.W, additional, Lohr, J.M, additional, Haye, R.J. La, additional, Maingi, R, additional, Miller, R.L, additional, Murakami, M, additional, Osborne, T.H, additional, Perkins, L.J, additional, Petty, C.C, additional, Rettig, C.L, additional, Rhodes, T.L, additional, Rice, B.W, additional, Sabbagh, S.A, additional, Schissel, D.P, additional, Scoville, J.T, additional, Snider, R.T, additional, Stallard, B.W, additional, Stambaugh, R.D, additional, John, H.E. St, additional, Stockdale, R.E, additional, Taylor, P.L, additional, Taylor, T.S, additional, Thomas, D.M, additional, Turnbull, A.D, additional, Wade, M.R, additional, Wood, R.D, additional, and Whye, D.G, additional

Published
1997
Full Text
View/download PDF

15. Observations of enhanced core confinement in negative magnetic shear discharges with an L mode edge on DIII-D

Author

Rice, B.W, primary, Lazarus, E.A, additional, Austin, M.E, additional, Burrell, K.H, additional, Casper, T.A, additional, Groebner, R.J, additional, Gohil, P, additional, Forest, C.B, additional, Ikezi, H, additional, Lao, L.L, additional, Mauel, M.E, additional, Navratil, G.A, additional, Stallard, B.W, additional, Strait, E.J, additional, and Taylor, T.S, additional

Published
1996
Full Text
View/download PDF

19. 140 GHz microwave FEL experiments using ELF-II

Author

Throop, A.L., primary, Jong, R.A., additional, Allen, S.L., additional, Atkinson, D.P., additional, Clark, J.C., additional, Felker, B., additional, Ferguson, S.W., additional, Makowski, M.A., additional, Nexsen, W.E., additional, Rice, B.W., additional, Stallard, B.W., additional, and Turner, W.C., additional

Published
1990
Full Text
View/download PDF

21. Analysis of single pass ECH propagation and absorption experiments in MTX

Author

Fenstermacher, M.E., primary, Allen, S.L., additional, Byers, J.A., additional, Casper, T.A., additional, Cohen, R.H., additional, Foote, J.H., additional, Hooper, E.B., additional, Makowski, M.A., additional, Meyer, W.H., additional, Moller, J.M., additional, Oasa, K., additional, Ogawa, T., additional, Rice, B.W., additional, Rognlien, T.D., additional, Smith, G.R., additional, Stallard, B.W., additional, Thomassen, K.I., additional, and Wood, R.D., additional

Published
1990
Full Text
View/download PDF

22. Modeling of the shear effects on the thermal ion transport in advanced tokamak scenarios.

Author

Voitsekhovitch, I., Garbet, X., Moreau, D., Bush, C.E., Litaudon, X., Budny, R.V., Gohil, P., Kinsey, J., Taylor, T.S., and Stallard, B.W.

Subjects
PLASMA gases, TOKAMAKS, MAGNETOHYDRODYNAMICS
Abstract

Analyzes plasma shear effects on thermal ion transport in advanced tokamak scenarios. Limitations encountered in previous shear dependent models; Proposal of a semi-empirical model that combines the effects of the magnetic and ExB rotation shears; Evolution of thermal ion internal transport barriers.

Published
1999
Full Text
View/download PDF

23. Transport and performance in DIII-D discharges with weak or negative central magnetic shear.

Author

Greenfield, C.M., Schissel, D.P., Stallard, B.W., Lazarus, E.A., Navratil, G.A., Burrell, K.H., Casper, T.A., DeBoo, J.C., Doyle, E.J., Fonck, R.J., Forest, C.B., Gohil, P., Groebner, R.J., Jakubowski, M., Lao, L.L., Murakami, M., Petty, C.C., Rettig, C.L., and Rhodes, T.L.

Subjects
TRANSPORT theory, TOKAMAKS, GLOW discharges
Abstract

Investigates the transport and performance in DIII-D tokamak discharges with weak or negative central magnetic shear. Heating of electrons by low-power neutral beam injection; Formation of a region of reduced transport and highly peaked profiles in the cores when the neutral beam power is increased.

Published
1997

24. Evolution of high beta[sub p] plasmas with improved stability and confinement*.

Author

Politzer, P.A., Casper, T., forest, C.B., Gohil, P., Heidbrink, W.W., Hyatt, A.W., James, R.A., Jong, R., Lao, L.L., Makowski, M., Meyer, W., Porter, G.D., Sager, G.T., Stallard, B.W., St. John, H., Thompson, S.J., Turnbull, A.D., and Wroblewski, D.

Subjects
PLASMA gases, TOKAMAKS, MAGNETOHYDRODYNAMICS
Abstract

Reports on experiments that explore the long-time evolution of noninductive, high beta plasmas in the DIII-D tokamak and identify a quiescent, high performance regime. Disappearance of magnetohydrodynamic activity with an increase in stored energy; Experimental conditions.

Published
1994
Full Text
View/download PDF

25. TMX-U thermal-barrier experiments

Author

Simonen, T.C., Allen, S.L., Barter, J.D., Casper, T.A., Correll, D.L., Carter, M.R., Clauser, J.F., Dimonte, G., Foote, J.H., Futch, A.H., Goodman, R.K., Grubb, D.P., Hill, D.N., Hooper, E.B., Hornady, R.S., James, R.A., Molvik, A.W., Nexsen, W.E., Porter, G.D., Rognlien, T.D., Silver, E.H., Stallard, B.W., Turner, W.C., and Wood, R.D.

Abstract

Thermal-barrier experiments in the Tandem Mirror Experiment Upgrade (TMX-U) are reported, along with progress made at the Lawrence Livermore National Laboratory in plasma confinement and central-cell heating. Thermal barriers in TMX-U improved axial confinement by two orders of magnitude over a limited range of densities, compared with confinement in single-cell mirrors at the same ion temperature. It is shown that central-cell radial nonambipolar confinement scales as neoclassical theory and can be eliminated by floating the end walls. Radial ambipolar losses can also be measured and reduced. The electron energy balance is improved in tandem mirrors to near classical, resulting in T/sub e/ up to 0.28 keV. Electron cyclotron heating (ECH) efficiencies up to 42%, with low levels of electron microinstability, were achieved when hot electrons in the thermal barrier were heated to average betas as large as 15%. The hot-electron distribution was measured from X-rays and is modeled by a Fokker-Planck code that includes heating from cavity radio-frequency (RF) fields.<>

Published
1988
Full Text
View/download PDF

26. Scaling of plasma potentials in TMX-U with the end walls grounded

Author

Porter, G.D., Allen, S.L., Burdett, C.J., Carter, M.R., Correll, D.L., Foote, J.H., Hornady, R.S., Nexsen, W.E., and Stallard, B.W.

Abstract

The scaling of the axial potential profile measured in the Tandem Mirror Experiment-Upgrade (TMX-U) is reported. These measurements were done with the end walls at ground potential. As predicted theoretically, the results suggest that a deep thermal barrier is achieved when the mirror confined electron fraction in the end cells exceeds 90% of the total density and when there is sufficient pumping of cold, potentially confined ions. In operation with shallow thermal barriers, a potential maximum near the inner turning point of the sloshing ions is frequently observed. The central cell confining potential associated with this local maximum is large enough to have a significant effect on the ion axial confinement time. Measurements of the total ion confining potential were difficult. There is evidence of classical scaling of the parallel particle confinement with the magnitude of the ion confining potential. However, in some cases, long axial confinement times are accompanied by enhanced ambipolar radial losses. These losses are interpreted as occurring in the population of passing ions. Finally, it is observed that the overall machine potential is determined by the plasma densities, the thermal barrier depth and the electron cyclotron heating power, consistent with theoretical predictions based only on collisional and radiofrequency diffusion of the electrons.

Published
1989
Full Text
View/download PDF

27. Characteristics of the scrape-off layer in DIII-D high-performance negative central magnetic shear discharges

Author

Lasnier, C.J., Maingi, R., Leonard, A.W., Allen, S.L., Buchenauer, D.A., Burrell, K.H., Casper, T.A., Cuthbertson, J.W., Fenstermacher, M.E., Hill, D.N., Jong, R.A., Lao, L.L., Lazarus, E.A., Moyer, R.A., Petrie, T.W., Porter, G.D., Rice, B.W., Stallard, B.W., Taylor, T.S., and Watkins, J.G.

Abstract

In this paper we present measurements of the global power and particle balance in the high-performance phase of negative central magnetic shear (NCS) discharges and compare with reference VH-mode discharges. The principal differences observed are that NCS has a much lower fraction of the total input power flowing into the boundary, less core radiation, and larger rate of stored energy increase as a fraction of total power. Scrape-off layer (SOL) temperature and divertor heat flux profiles, and radiation profiles at the midplane, are similar to VH-mode. Due to the good core particle confinement and efficient fueling by neutral beam injection (NBI), with little gas puffing, the gas load on the walls and the recycling are very low during the NCS discharges. This results in a rate of density rise relative to beam fueling at the L to H transition time which is 1/3 of the value for VH transitions, which is in turn 1/2 that for L-to-ELMing-H-mode transitions.

Published
1997
Full Text
View/download PDF

28. Field-reversal experiments in a neutral-beam-injected mirror machine

Author

Turner, W.C., Clauser, J.F., Coensgen, F.H., Correll, D.L., Cummins, W.F., Freis, R.P., Goodman, R.K., Hunt, A.L., Kaiser, T.B., Melin, G.M., Nexsen, W.E., Simonen, T.C., and Stallard, B.W.

Abstract

Data on field-reversal experiments in the neutral-beam-injected 2XIIB mirror machine are reported. The best result is an estimated field-reversal parameter ? = ?B/Bvac= 0.9 ± 0.2 with vacuum field strength Bvac= 4.35 kG. Experiments at higher field strength Bvac= 6.7 kG achieved ? = 0.6 ± 0.1. Ion energy confinement n?Eifor the Bvac= 6.7 kG experiment is less than that predicted by classical Spitzer electron drag. Ion-cyclotron oscillations increasing with injected neutral-beam current suggest that ion-cyclotron losses are present and that ?B/Bvaccould be increased by improving stabilization of the ion-cyclotron oscillations.

Published
1979
Full Text
View/download PDF

29. Ambipolar potential formation and axial confinement in TMX

Author

Correll, D.L., primary, Allen, S.L., additional, Capser, T.A., additional, Clauser, J.F., additional, Coakley, P., additional, Coensgen, F.H., additional, Condit, W., additional, Cummins, W.F., additional, Davis, J.C., additional, Drake, R.P., additional, Foote, J.H., additional, Futch, A.H., additional, Goodman, R.K., additional, Grubb, D.P., additional, Hallock, G.A., additional, Hooper, E.B., additional, Hornady, R.S., additional, Hunt, A.L., additional, Karmendy, C.V., additional, Molvik, A.W., additional, Nexsen, W.E., additional, Pickles, W.L., additional, Poulsen, P., additional, Simonen, T.C., additional, Stallard, B.W., additional, and Strand, O.T., additional

Published
1982
Full Text
View/download PDF

32. IMP, a free electron laser amplifier for plasma heating in the Microwave Tokamak Experiment

Author

Jong, R.A., primary, Atkinson, D.P., additional, Byers, J.A., additional, Coffield, F.E., additional, Deis, G.A., additional, Felker, B., additional, Ferguson, S.W., additional, Fontaine, R.A., additional, Hopkins, D.B., additional, Makowski, M., additional, Orzechowski, T.J., additional, Paul, A.C., additional, Scharlemann, E.T., additional, Schlueter, R.D., additional, Stallard, B.W., additional, Stever, R.D., additional, and Throop, A.L., additional

Published
1989
Full Text
View/download PDF

33. The effect of end-cell stability on the confinement of the central-cell plasma in TMX

Author

Drake, R.P., primary, Casper, T.A., additional, Clauser, J.F., additional, Coensgen, F.H., additional, Correll, D.L., additional, Cummins, W.F., additional, Davis, J.C., additional, Foote, J.H., additional, Futch, A.H., additional, Goodman, R.K., additional, Grubb, D.P., additional, Hornady, R.S., additional, Nexsen, W.E., additional, Simonen, T.C., additional, and Stallard, B.W., additional

Published
1981
Full Text
View/download PDF

34. Production of large-radius, high-beta, confined mirror plasmas

Author

Correll, D.L., primary, Clauser, J.H., additional, Coensgen, F.H., additional, Cummins, W.F., additional, Drake, R.P., additional, Foote, J.H., additional, Futch, A.H., additional, Goodman, R.K., additional, Grubb, D.P., additional, Melin, G.M., additional, Nexsen, W.E., additional, Simonen, T.C., additional, Stallard, B.W., additional, and Turner, W.C., additional

Published
1980
Full Text
View/download PDF

35. 140 GHz Microwave FEL Experiments Using ELF-II

Author

Throop, A.L., primary, Jong, R.A., additional, Allen, S.l., additional, Atkinson, D.P., additional, Clark, J.C., additional, Felker, B., additional, Ferguson, S.W., additional, Makowski, M.A., additional, Nexsen, W.E., additional, Rice, B.W., additional, Stallard, B.W., additional, and Turner, W.C., additional

Full Text
View/download PDF

38. Burst mode FEL with the ETA-III induction linac

Author

Lasnier, C.J., primary, Allen, S.L., additional, Felker, B., additional, Fenstermacher, M.E., additional, Ferguson, S.W., additional, Hulsey, S.D., additional, Hooper, E.B., additional, Jackson, M.C., additional, Makowski, M.A., additional, Meyer, W.H., additional, Moller, J.M., additional, Petersen, D.E., additional, Sampayan, S.E., additional, Stallard, B.W., additional, Fields, W.F., additional, and Oasa, K., additional

Full Text
View/download PDF

43. Burst mode FEL with the ETA-III induction linac.

Author

Lasnier, C.J., Allen, S.L., Felker, B., Fenstermacher, M.E., Ferguson, S.W., Hulsey, S.D., Hooper, E.B., Jackson, M.C., Makowski, M.A., Meyer, W.H., Moller, J.M., Petersen, D.E., Sampayan, S.E., Stallard, B.W., Fields, W.F., and Oasa, K.

Published
1993
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results