Search Results - "BURRELL, K. H"

Role of zonal flow predator-prey oscillations in triggering the transition to H-mode confinement by Schmitz, L, Zeng, L, Rhodes, T L, Hillesheim, J C, Doyle, E J, Groebner, R J, Peebles, W A, Burrell, K H, Wang, G

“…Direct evidence of zonal flow (ZF) predator-prey oscillations and the synergistic roles of ZF- and equilibrium E×B flow shear in triggering the low- to…”
Get full text

Access to a new plasma edge state with high density and pressures using the quiescent H mode by Solomon, W M, Snyder, P B, Burrell, K H, Fenstermacher, M E, Garofalo, A M, Grierson, B A, Loarte, A, McKee, G R, Nazikian, R, Osborne, T H

“…A path to a new high performance regime has been discovered in tokamaks that could improve the attractiveness of a fusion reactor. Experiments on DIII-D using…”
Get full text

Quasistationary Plasma Predator-Prey System of Coupled Turbulence, Drive, and Sheared E×B Flow During High Performance DIII-D Tokamak Discharges by Barada, K, Rhodes, T L, Burrell, K H, Zeng, L, Bardóczi, L, Chen, Xi, Muscatello, C M, Peebles, W A

“…A new, long-lived limit cycle oscillation (LCO) regime has been observed in the edge of near zero torque high performance DIII-D tokamak plasma discharges…”
Get full text

High-frequency coherent edge fluctuations in a high-pedestal-pressure quiescent H-mode plasma by Yan, Z, McKee, G R, Groebner, R J, Snyder, P B, Osborne, T H, Burrell, K H

“…A set of high frequency coherent (HFC) modes (f=80-250 kHz) is observed with beam emission spectroscopy measurements of density fluctuations in the pedestal of…”
Get full text

Observation of plasma rotation driven by static nonaxisymmetric magnetic fields in a tokamak by Garofalo, A M, Burrell, K H, DeBoo, J C, deGrassie, J S, Jackson, G L, Lanctot, M, Reimerdes, H, Schaffer, M J, Solomon, W M, Strait, E J

“…We present the first evidence for the existence of a neoclassical toroidal rotation driven in a direction counter to the plasma current by nonaxisymmetric,…”
Get full text

Observation of a critical gradient threshold for electron temperature fluctuations in the DIII-D Tokamak by Hillesheim, J C, DeBoo, J C, Peebles, W A, Carter, T A, Wang, G, Rhodes, T L, Schmitz, L, McKee, G R, Yan, Z, Staebler, G M, Burrell, K H, Doyle, E J, Holland, C, Petty, C C, Smith, S P, White, A E, Zeng, L

“…A critical gradient threshold has been observed for the first time in a systematic, controlled experiment for a locally measured turbulent quantity in the core…”
Get full text

Anomalous flattening of the fast-ion profile during Alfvén-Eigenmode activity by Heidbrink, W W, Gorelenkov, N N, Luo, Y, Van Zeeland, M A, White, R B, Austin, M E, Burrell, K H, Kramer, G J, Makowski, M A, McKee, G R, Nazikian, R

“…Neutral-beam injection into plasmas with negative central shear produces a rich spectrum of toroidicity-induced and reversed-shear Alfvén eigenmodes in the…”
Get full text

Signature of turbulent zonal flows observed in the DIII-D tokamak by Coda, S, Porkolab, M, Burrell, K H

“…The spectrum of turbulent density fluctuations at long poloidal wavelengths in the edge plasma of the DIII-D tokamak peaks at nonzero radial wave number. The…”
Get full text

Edge-localized-mode -induced transport of impurity density, energy, and momentum by WADE, M. R, BURRELL, K. H, LEONARD, A. W, OSBORNE, T. H, SNYDER, P. B

“…High temporal and spatial resolution measurements of impurity dynamics associated with an edge-localized mode (ELM) indicate that the ELM perturbation consists…”
Get full text

Multitude of core-localized shear Alfvén waves in a high-temperature fusion plasma by Nazikian, R, Berk, H L, Budny, R V, Burrell, K H, Doyle, E J, Fonck, R J, Gorelenkov, N N, Holcomb, C, Kramer, G J, Jayakumar, R J, La Haye, R J, McKee, G R, Makowski, M A, Peebles, W A, Rhodes, T L, Solomon, W M, Strait, E J, Vanzeeland, M A, Zeng, L

“…Evidence is presented for a multitude of discrete frequency Alfvén waves in the core of magnetically confined high-temperature fusion plasmas. Multiple…”
Get full text

Pedestal, SOL and divertor plasma properties in DIII-D RMP ELM-suppressed discharges at ITER relevant edge collisionality by Fenstermacher, M.E., Evans, T.E., Moyer, R.A., Porter, G.D., Boedo, J.A., Burrell, K.H., Groth, M., Joseph, I., Osborne, T.H., Watkins, J.G.

“…Large Type-I edge localized modes (ELMs) were completely suppressed by applying edge resonant magnetic perturbations (RMPs) in DIII-D H-mode plasmas with the…”
Get full text

Toroidally resolved structure of divertor heat flux in RMP H-mode discharges on DIII-D by Jakubowski, M.W., Evans, T.E., Fenstermacher, M.E., Lasnier, C.J., Wolf, R.C., Baylor, L.R., Boedo, J.A., Burrell, K.H., deGrassie, J.S., Gohil, P., Mordijck, S., Laengner, R., Leonard, A.W., Moyer, R.A., Petrie, T.W., Petty, C.C., Pinsker, R.I., Rhodes, T.L., Schaffer, M.J., Schmitz, O., Snyder, P.B., Stoschus, H., Osborne, T.H., Orlov, D.M., Unterberg, E.A., Watkins, J.G.

“…As shown on DIII-D edge localized modes (ELMs) can be either completely eliminated or mitigated with resonant magnetic perturbation (RMP) fields. Two infrared…”
Get full text

Quiescent double barrier regime in the DIII-D tokamak by Greenfield, C M, Burrell, K H, DeBoo, J C, Doyle, E J, Stallard, B W, Synakowski, E J, Fenzi, C, Gohil, P, Groebner, R J, Lao, L L, Makowski, M A, McKee, G R, Moyer, R A, Rettig, C L, Rhodes, T L, Pinsker, R I, Staebler, G M, West, W P

“…A new sustained high-performance regime, combining discrete edge and core transport barriers, has been discovered in the DIII-D tokamak. Edge localized modes…”
Get full text

Role of edge electric field and poloidal rotation in the L-H transition by GROEBNER, R. J, BURRELL, K. H, SERAYDARIAN, R. P

“…Marked changes in the edge radial electric field {ital E}{sub {ital r}} and in the edge poloidal rotation velocity {ital v}{sub {theta}} are important…”
Get full text

Investigations of H-mode plasmas triggered directly by pellet injection in the DIII-D tokamak by Gohil, P, Baylor, L R, Jernigan, T C, Burrell, K H, Carlstrom, T N

“…The transition from low-confinement (L-mode) to high-confinement (H-mode) plasmas has been directly produced by injecting frozen deuterium pellets in the…”
Get full text

Experimental investigation of the role of fluid turbulent stresses and edge plasma flows for intrinsic rotation generation in DIII-D H-mode plasmas by Müller, S H, Boedo, J A, Burrell, K H, DeGrassie, J S, Moyer, R A, Rudakov, D L, Solomon, W M

“…The first measurements of turbulent stresses and flows inside the separatrix of a tokamak H-mode plasma are reported, using a reciprocating multitip Langmuir…”
Get full text

Correlation of neutral beam injection parameters and core β with anomalous first-wall heating during QH-mode by Lasnier, C.J., Burrell, K.H., deGrassie, J.S., Rhodes, T.L., VanZeeland, M.A., Watkins, J.G.

“…Anomalous first-wall heating has been observed far from the divertor strike point during QH-mode in DIII-D, with measured heat flux comparable to that at the…”
Get full text

Quiescent H-mode plasmas with strong edge rotation in the cocurrent direction by Burrell, K H, Osborne, T H, Snyder, P B, West, W P, Fenstermacher, M E, Groebner, R J, Gohil, P, Leonard, A W, Solomon, W M

“…For the first time in any tokamak, quiescent H-mode (QH-mode) plasmas have been created with strong edge rotation in the direction of the plasma current. This…”
Get full text

Direct Measurement of the Radial Electric Field in Tokamak Plasmas using the Stark Effect by Rice, B. W., Burrell, K. H., Lao, L. L., Lin-Liu, Y. R.

Get full text

Regime of very high confinement in the boronized DIII-D Tokamak by JACKSON, G. L, WINTER, J, LAO, L. L, LIPPMANN, S. I, OSBORNE, T. H, PETRIE, T. W>, PHILLIPS, J, JAMES, R, SCHISSEL, D. P, STRAIT, E. J, TURNBULL, A. D, WEST, W. P, TAYLOR, T. S, TEAM, D. D, BURRELL, K. H, DEBOO, J. C, GREENFIELD, C. M, GROEBNER, R. J, HODAPP, T, HOLTROP, K, LAZARUS, E. A

“…Following boronization, tokamak discharges in DIII-D have been obtained with confinement times up to a factor of 3.5 above the ITER89-P {ital L}-mode scaling…”
Get full text