551 to 560 of 570 Results
G. D. Sutcliffe, L. M. Milanese, D. Orozco, B. Lahmann, M. Gatu Johnson, F. H. Séguin, H. Sio, J. A. Frenje, C. K. Li, R. D. Petrasso, H.-S. Park, J. R. Rygg, D. T. Casey, R. Bionta, D. P. Turnbull, C. M. Huntington, J. S. Ross, A. B. Zylstra, M. J. Rosenberg, V. Yu. Glebov, 2018, "A novel method to recover DD fusion proton CR-39 data corrupted by fast ablator ions at OMEGA and the National Ignition Facility", https://doi.org/10.7910/DVN/G9U23R, Harvard Dataverse, V1, UNF:6:WTlxdfyEKyiPOXH3h5P0oQ== [fileUNF]
CR-39 detectors are used routinely in inertial confinement fusion (ICF) experiments as a part of nuclear diagnostics. CR-39 is filtered to stop fast ablator ions which have been accelerated from an ICF implosion due to electric fields caused by laser-plasma interactions. In some experiments, the filtering is insufficient to block these ions and the... |
M. Gatu Johnson, D.T. Casey, M. Hohenberger, A.B. Zylstra, A. Bacher, C.R. Brune, R.M. Bionta, R.S. Craxton, C.l. Ellison, M. Farrell, J.A. Frenje, W. Garbett, E.M. Garcia, G.P. Grim, E. Hartouni, R. Hatarik, H.W. Herrmann, M. Hohensee, D.M. Holunga, M. Hoppe, M. Jackson, N. Kabadi, S.F. Khan, J.D. Kilkenny, T.R. Kohut, B. Lahmann, H.P. Le, C.K. Li, L. Masse, P.W. McKenty, D.P. McNabb, A. Nikroo, T.G. Parham, C.E. Parker, R.D. Petrasso, J. Pino, B. Remington, N.G. Rice, H.G. Rinderknecht, M.J. Rosenberg, J. Sanchez, D.B. Sayre, M.E. Schoff, C.M. Shuldberg, F.H. Séguin, H. Sio, Z.B. Walters, H.D. Whitley, 2018, "Optimization of a high-yield, low-areal-density fusion product source at the National Ignition Facility with applications in nucleosynthesis experiments", https://doi.org/10.7910/DVN/UTFQQE, Harvard Dataverse, V1, UNF:6:wDvuiTFSU0E/yLAkJslK1w== [fileUNF]
Polar-direct-drive exploding pushers are used as a high-yield, low-areal-density fusion product source at the National Ignition Facility with applications including diagnostic calibration, nuclear security, backlighting, electron-ion equilibration and nucleosynthesis-relevant experiments. In this paper, two different paths to improving the performa... |
Oct 3, 2018
J.W. Hughes, P.B. Snyder, M.L. Reinke, B. LaBombard, S. Mordijck, S. Scott, E. Tolman, S.G. Baek, T. Golfinopoulos, R.S. Granetz, M. Greenwald, A.E. Hubbard, E. Marmar, J.E. Rice, A.E. White, D.G. Whyte, T. Wilks, S. Wolfe, 2018, "Access to pedestal pressure relevant to burning plasmas on the high magnetic field tokamak Alcator C-Mod", https://doi.org/10.7910/DVN/0JOUCX, Harvard Dataverse, V1
Experiments on the Alcator C-Mod tokamak have utilized reactor-relevant magnetic fields to sustain substantially higher pedestal pressure than in other devices and allow close approach to the ITER H-mode baseline target pedestal pressure of 90 kPa. The EPED model, which couples the physics of transport driven by kinetic ballooning modes and MHD ins... |
I. H. Hutchinson, 2018, "The mechanism of plasma electron hole transverse instability", https://doi.org/10.7910/DVN/X6XQTM, Harvard Dataverse, V1, UNF:6:VCd4fG0yqyI1tXZGUsdMYA== [fileUNF]
It is shown through multidimensional particle-in-cell simulation that the transverse instability of plasma electron holes is caused not by the previously proposed focusing of trapped particles, but instead by kinematic jetting of marginally passing electrons. The mechanism is explained and heuristic analytic estimates obtained which agree with the... |
B. Li, C. K. Sun, X. Y. Wang, A. Zhou, X. G. Wang, D. R. Ernst, 2018, "Fluctuation-induced shear flow and energy transfer in plasma interchange turbulence", https://doi.org/10.7910/DVN/ERKEQE, Harvard Dataverse, V1
Fluctuation-induced E × B shear flow and energy transfer for plasma interchange turbulence are examined in a flux-driven system with both closed and open magnetic field lines. The nonlinear evolution of interchange turbulence shows the presence of two confinement regimes characterized by low and high E × B flow shear. In the first regime, the large... |
Roy Alexander Tinguely, Robert Granetz, Mathias Hoppe, Ola Embreus, 2018, "Measurements of runaway electron synchrotron spectra at high magnetic fields in Alcator C-Mod", https://doi.org/10.7910/DVN/2ARZ0G, Harvard Dataverse, V1, UNF:6:NceA25eI8xLPWZiCf4yDZw== [fileUNF]
In the Alcator C-Mod tokamak, runaway electron (RE) experiments have been performed during low density, flattop plasma discharges at three magnetic fields: 2.7, 5.4, and 7.8 T, the last being the highest field to-date at which REs have been generated and measured in a tokamak. Time-evolving synchrotron radiation spectra were measured in the visible... |
Sep 19, 2018
P. Rodriguez-Fernandez, A. E. White, N. T. Howard, B. A. Grierson, G. M. Staebler, J. E. Rice, X. Yuan, N. M. Cao, A. J. Creely, M. J. Greenwald, A. E. Hubbard, J. W. Hughes, J. H. Irby, F. Sciortino, 2018, "Explaining Cold-Pulse Dynamics in Tokamak Plasmas Using Local Turbulent Transport Models", https://doi.org/10.7910/DVN/FJ2HKQ, Harvard Dataverse, V1
A long-standing enigma in plasma transport has been resolved by modeling of cold-pulse experiments conducted on the Alcator C-Mod tokamak. Controlled edge cooling of fusion plasmas triggers core electron heating on time scales faster than an energy confinement time, which has long been interpreted as strong evidence of nonlocal transport. This Lett... |
Sep 19, 2018
Adam Kuang, Dan Brunner, Brian LaBombard, Rick Leccacorvi, Rui Vieira, 2018, "The flush-mounted rail Langmuir probe array designed for the Alcator C-Mod vertical target plate divertor", https://doi.org/10.7910/DVN/4TVWRE, Harvard Dataverse, V1
An array of flush-mounted and toroidally elongated Langmuir probes (henceforth called rail probes) have been specifically designed for the Alcator C-Mod’s vertical target plate divertor and operated over multiple campaigns. The “flush” geometry enables the tungsten electrodes to survive high heat flux conditions in which traditional “proud” tungste... |
M. Gatu Johnson, J. Katz, C. Forrest, J.A. Frenje, V.Yu. Glebov, C.K. Li, R. Paguio, C.E. Parker, C. Robillard, T.C. Sangster, M. Schoff, F.H. Séguin, C. Stoeckl, R.D. Petrasso, 2018, "Measurement of apparent ion temperature using the magnetic recoil spectrometer at the OMEGA laser facility", https://doi.org/10.7910/DVN/LCYSUP, Harvard Dataverse, V1, UNF:6:hPQy6w7liDasEULczI22Sw== [fileUNF]
The Magnetic Recoil neutron Spectrometer (MRS) at the OMEGA laser facility has been routinely used to measure deuterium-tritium (DT) yield and areal density in cryogenically layered implosions since 2008. Recently, operation of the OMEGA MRS in higher-resolution mode with a new smaller, thinner (4 cm[sup]2, 57-um thick) CD2 conversion foil has also... |
Kevin Woller, Dennis Whyte, Graham Wright, Dan Brunner, 2018, "Experimental Investigation on the effect of surface electric field in the growth of tungsten nano-tendril morphology due to low energy helium irradiation", https://doi.org/10.7910/DVN/J5HLLN, Harvard Dataverse, V1, UNF:6:SgtSphfP8yH3TmBZKjuhSA== [fileUNF]
The mechanisms responsible for and controlling the growth of tungsten nano-tendrils (or "fuzz") under low-energy helium plasma exposure remain unclear. For the first time in nano-tendril experiments, the plasma sheath-produced electric field and the helium (He) ion energy have been decoupled, showing that the sheath electric field has little impact... |
