Results 21 to 30 of about 15,788,610 (233)

Upgrades to the ion cyclotron emission diagnostic on the DIII-D tokamak.

Review of Scientific Instruments, 2021
The ion cyclotron emission diagnostic on the DIII-D tokamak comprises seven single-turn loops that measure high-frequency (1-100 MHz) magnetic field fluctuations that are often excited by energetic particles in the plasma. The raw voltage signals induced
G. DeGrandchamp, K. Thome, W. Heidbrink, I. Holmes, R. Pinsker   +4 more
semanticscholar   +1 more source

Increased radiation due to non-coronal effects on DIII-D and MAST-U with varying input power

Nuclear Fusion, 2022
Through SOLPS-ITER simulations of DIII-D and MAST-U, an X-divertor (XD) on DIII-D and a super X-divertor (SXD) on MAST-U were shown to have increased carbon emissivity ( P _Rad / n _e n _I ) over corresponding standard divertors (SD) at similar degrees ...
Jonathan Roeltgen, Mike Kotschenreuther, James Harrison, David Moulton, Zhong-Ping Chen, Swadesh Mahajan   +5 more
doaj   +1 more source

Avoidance of vertical displacement events in DIII-D using a neural network growth rate estimator

, 2021
Robust disruption avoidance techniques are critical for the development of reliable fusion reactor devices. A viable reactor will require non-disruptive, long pulse operation where simply shutting down a discharge is undesirable.
B. Sammuli, J. Barr, D. Humphreys
semanticscholar   +1 more source

Disruptive neoclassical tearing mode seeding in DIII-D with implications for ITER

Nuclear Fusion, 2021
New studies identify the critical parameters and physics governing disruptive neoclassical tearing mode (NTM) onset. An m/n = 2/1 mode in DIII-D that begins to grow robustly after a seeding event (edge localized mode ELM or sawtooth precursor and crash ...
R. L. La Haye, C. Chrystal, E. Strait, J. Callen, C. Hegna, E. Howell, M. Okabayashi, R. Wilcox   +7 more
semanticscholar   +1 more source

The role of edge resonant magnetic perturbations in edge-localized-mode suppression and density pump-out in low-collisionality DIII-D plasmas [PDF]

Nuclear Fusion, 2020
Two-fluid nonlinear MHD simulations using the TM1 code demonstrate that the formation of magnetic islands at the top and bottom of the H-mode pedestal, together with the strong screening of resonant fields in the gradient region of the pedestal, can ...
Q. Hu, R. Nazikian, B. Grierson, N. Logan, C. Paz-Soldan, Q. Yu   +5 more
semanticscholar   +1 more source

Effect of heating scheme on SOL width in DIII-D and EAST

Nuclear Materials and Energy, 2017
Joint DIII-D/EAST experiments in the radio-frequency (RF) heated H-mode scheme with comparison to that of neutral beam (NB) heated H-mode scheme were carried out on DIII-D and EAST under similar conditions to examine the effect of heating scheme on ...
L. Wang, M.A. Makowski, H.Y. Guo, A.W. Leonard, G.S. Xu, X.Z. Gong, A.M. Garofalo, G.Z. Deng, T.W. Petrie, D. Thomas, G. Jackson, G. Kramer, R. Maingi, J.B. Liu, W. Feng, H. Wang, B. Zhang, S. Ding, C.K. Pan, Y.J. Hu, J.P. Qian, J. Li, B.N. Wan   +22 more
doaj   +1 more source

Studies of EC pre-ionization in DIII-D to support development of ITER plasma initiation

Nuclear Fusion, 2022
New experiments have been conducted at DIII-D to improve the physics understanding of plasma initiation assisted by electron cyclotron (EC) wave injection, allowing better extrapolation to ITER.
J. Sinha, P. D. de Vries, M. Walker, D. Battaglia, F. Turco, A. Hyatt, H. Kim, J. Stober, R. Yoneda, Y. Gribov, S. Haskey, I. Bykov, E. Hollmann, J. Herfindal, F. Glass, J. Chen, A. McLean, the DIII–D Team   +17 more
semanticscholar   +1 more source

Evaluation of DIII-D plasmas for Future Measurements of the Driven Current Density in the DIII-D High Field Side Lower Hybrid Experiment [PDF]

EPJ Web of Conferences
High field side (HFS) lower hybrid current drive (LHCD) is a promising method for efficiently driving off-axis current in steady state tokamak power plants. The first test of this technology is underway at the DIII-D tokamak.
Rutherford Grant, Cengher Mirela, Garcia Ivan, Gould Malcolm, Leppink Evan, Lin Yijun, Pierson Samuel, Ridzon James, Seltzman Andrew H., Victor Brian S., Wukitch Stephen J.   +10 more
doaj   +1 more source

Achievement of Reactor-Relevant Performance in Negative Triangularity Shape in the DIII-D Tokamak.

Physical Review Letters, 2019
Plasma discharges with a negative triangularity (δ=-0.4) shape have been created in the DIII-D tokamak with a significant normalized beta (β_{N}=2.7) and confinement characteristic of the high confinement mode (H_{98y2}=1.2) despite the absence of an ...
M. Austin, A. Marinoni, M. Walker, M. Brookman, J. Degrassie, A. W. Hyatt, G. R. Mckee, C. Petty, T. Rhodes, S. P. Smith, C. Sung, K. Thome, A. Turnbull   +12 more
semanticscholar   +1 more source

Overview of H-mode studies in DIII-D [PDF]

Plasma Physics and Controlled Fusion, 1994
A major portion of the DIII-D program includes studies of the L-H transition, of the VH-mode, of particle transport and control and of the power-handling capability of a divertor. Significant progress has been made in all of these areas and the aim is to summarize the major results.
Groebner, R. J., Allen, S. L., Baker, D. R., Brooks, N. H., Buchenauer, D. A., Burrell, K. H., Carlstrom, T. N., Chu, M. S., Coda, S., Cuthbertson, J., Doyle, E. J., Evans, T. E., Ferron, J. R., Finkenthal, D., Futch, A. H., Gohil, P., Greenfield, C. M., Hill, D. N., Hillis, D. L., Hinton, F. L., Hogan, J., Hsieh, C. L., Hyatt, A. W., Jackson, G. L., Jong, R., Kim, J., Kim, Y. B., Klepper, C. C., Konoshima, S., Lahaye, R. J., Lao, L. L., Lasnier, C. J., Lazarus, E. A., Leonard, A. W., Lippmann, S. I., Mahdavi, M. A., Maingi, R., Mandl, W., Martin, Y., Moyer, R. A., Osborne, T. H., Peebles, W. A., Petrie, T. W., Porter, G. D., Rensink, M. E., Rettig, C. L., Rhodes, T. H., Schaffer, M. J., Schissel, D. P., Seraydarian, R. P., Snider, R. T., Staebler, G. M., Stambaugh, R. D., Stjohn, H., Strait, E. J., Taylor, T. S., Thomas, D. M., Thompson, S. J., Turnbull, A. D., Wade, M. R., Watkins, J. G., West, W. P., Wood, R. D., Wroblewski, D.   +63 more
openaire   +2 more sources