Results 51 to 60 of about 63,312 (284)

EDA H-mode in ASDEX Upgrade: scans of heating power, fueling, and plasma current

Nuclear Fusion
Electron cyclotron resonance heating (ECRH) staircase discharges in strongly shaped plasmas were performed at the full-tungsten ASDEX Upgrade tokamak to investigate the enhanced D _α (EDA) H-mode, a high-confinement regime without edge localized modes ...
L. Gil, T. Pütterich, C. Silva, D. Hachmeister, G.D. Conway, P. David, M. Faitsch, R. Fischer, T. Happel, A. Kallenbach, J. Santos, A. Silva, J. Stober, U. Stroth, E. Viezzer, E. Wolfrum, the ASDEX Upgrade Team, the EUROfusion Tokamak Exploitation Team   +17 more
doaj   +1 more source

Blob velocities and sizes in the Alcator C-Mod scrape-off layer for ohmic and high confinement mode plasmas

Nuclear Materials and Energy
An improved time delay estimation method is used to calculate the velocity of cross-field blob motion in the scrape-off layer of Alcator C-Mod for an ohmic and two high confinement (H-mode) plasmas; an edge localized mode free and an enhanced D-alpha H ...
A.D. Helgeland, J.M. Losada, J.L. Terry, O.E. Garcia   +3 more
doaj   +1 more source

Impact of wall materials and seeding gases on the pedestal and on core plasma performance

Nuclear Materials and Energy, 2017
Plasmas in machines with all metal plasma facing components have a lower Zeff, less radiation cooling in the scrape-off layer and divertor regions and are prone to impurity accumulation in the core. Higher gas puff and the seeding of low-Z impurities are
E. Wolfrum, M. Beurskens, M.G. Dunne, L. Frassinetti, X. Gao, C. Giroud, J. Hughes, T. Lunt, R. Maingi, T. Osborne, M. Reinke, H. Urano   +11 more
doaj   +1 more source

On the origin of the DIII-D L-H power threshold isotope effect

Nuclear Fusion, 2023
The increased low to high confinement mode (L to H-mode) power threshold $P_\mathrm{LH}$ in DIII-D low collisionality hydrogen plasmas (compared to deuterium) is shown to result from lower impurity (carbon) content, consistent with reduced (mass ...
K.J. Callahan, L. Schmitz, T.A. Carter, E.A. Belli, C. Chrystal, S.R. Haskey, B.A. Grierson, K.E. Thome, S.P. Smith, G.R. McKee, G.M. Staebler, C. Holland, A. Ashourvan, Z. Yan   +13 more
doaj   +1 more source

Edge radial electric field structure and its connections to H-mode confinement in Alcator C-Mod plasmas [PDF]

Physics of Plasmas, 2009
High-resolution charge-exchange recombination spectroscopic measurements of B5+ ions have enabled the first spatially resolved calculations of the radial electric field (Er) in the Alcator C-Mod pedestal region [E. S. Marmar, Fusion Sci. Technol. 51, 261 (2006)].
Lipschultz, Bruce, McDermott, R. M., Catto, Peter J., Granetz, Robert S., Greenwald, Martin J., Labombard, Brian, Marr, K., Rice, John E., Alcator C-Mod Team, Reinke, Matthew Logan, Hutchinson, Ian Horner, Hughes Jr, Jerry, Hubbard, Amanda E, Whyte, Dennis G   +13 more
openaire   +2 more sources

Cutaneous Melanoma Drives Metabolic Changes in the Aged Bone Marrow Immune Microenvironment

Aging and Cancer, EarlyView.
Melanoma, the deadliest form of skin cancer, increasingly affects older adults. Our study reveals that melanoma induces changes in iron and lipid levels in the bone marrow, impacting immune cell populations and increasing susceptibility to ferroptosis.
Alexis E. Carey, Murilo Ramos Rocha, Cheyenne Palm, Vania Wang, Denys Balandin, Ethan Black, Kevin Y. Zhang, Fan Huang, Daniel J. Zabransky, Yash Chhabra, Mareike Peters, Gabriel Ghiaur, Ashani Weeraratna   +12 more
wiley   +1 more source

Edge radiated temperature fluctuations across confinement regime transitions in favorable and unfavorable drift configurations at ASDEX Upgrade

Nuclear Fusion, 2023
The physics behind the difference in heating power threshold for the low to high confinement (L–H) transition between favorable ion $B \times \nabla B$ drift (toward active X -point) and unfavorable ion $B \times \nabla B$ drift (away from active X ...
R. Bielajew, U. Plank, G.D. Conway, A.E. Hubbard, P. Rodriguez-Fernandez, B. Vanovac, C. Yoo, A.E. White, the ASDEX Upgrade Team   +8 more
doaj   +1 more source

L-H transition dynamics in fluid turbulence simulations with neoclassical force balance [PDF]

, 2013
Spontaneous transport barrier generation at the edge of a magnetically confined plasma is investigated. To this end, a model of electrostatic turbulence in three-dimensional geometry is extended to account for the impact of friction between trapped and ...
C. Bourdelle, G. Fuhr, Helander P., L. Chôné, P. Beyer, S. Benkadda, Y. Sarazin   +6 more
core   +5 more sources

Elinvar Materials: Recent Progress and Challenges

Advanced Engineering Materials, EarlyView.
Elinvar materials, exhibiting temperature‐invariant elastic modulus, are critical for precision instruments and emerging technologies. This article reviews recent progress in the field, with a focus on the anomalous thermoelastic behavior observed in key material systems.
Wenjie Li, Yang Ren
wiley   +1 more source

Impact of nitrogen seeding on L–H transitions and their role for detachment in ASDEX Upgrade

Nuclear Fusion
The required heating power, $P_{\mathrm{LH}}$ , to access the high confinement regime (H-mode) in nitrogen seeded deuterium plasmas is investigated at the ASDEX Upgrade tokamak. It is shown that a stepwise increase of the nitrogen seeding level increases
G. Birkenmeier, M. Bernert, D. Brida, P. David, R. Fischer, T. Happel, B. Kurzan, T. Lunt, F. Ryter, E. Wolfrum, the ASDEX Upgrade Team   +10 more
doaj   +1 more source