521 to 530 of 570 Results
Espinosa, Silvia, and Catto, Peter J., 2018, "Radial impurity flux measuring method with plasma heating in general geometry", https://doi.org/10.7910/DVN/K7OTF8, Harvard Dataverse, V1
Devising a means to measure the radial impurity flux across the pedestal could be used to reduce impurity accumulation, if not prevent it while providing natural fueling, and thus improving fusion performance in tokamaks. We employ a novel solution procedure that takes advantage of the poloidal flow measurement to obtain the radial impurity flux di... |
Nuno F. Loureiro, Stanislav Boldyrev, 2018, "Collisionless Reconnection In Magnetohydrodynamic and Kinetic Turbulence", https://doi.org/10.7910/DVN/JTKKXJ, Harvard Dataverse, V1
It has recently been proposed (Loureiro & Boldyrev 2017; Mallet et al. 2017) that the inertial interval in magnetohydrodynamic (MHD) turbulence is terminated at small scales not by a Kolmogorov-like dissipation region, but rather by a new sub-inertial interval mediated by tearing instability. However, many astrophysical plasmas are nearly collision... |
Oct 25, 2018
Peter J. Catto, Sergei I. Krasheninnikov, 2018, "Magnetorotational stability in a self-consistent three dimensional axisymmetric magnetized warm plasma equilibrium with a gravitational field", https://doi.org/10.7910/DVN/OO7GYG, Harvard Dataverse, V1
Magnetorotational stability is revisited for self-consistent three-dimensional magnetized hot plasma equilibria in a gravitational field. The eikonal analysis presented finds that magnetorotational stability analysis must be performed with some care to retain compressibility and density gradient effects, and departures from strict Keplerian motion.... |
A. B. Zylstra, , H.W. Herrmann, M. Gatu Johnson, Y. H. Kim, J. A. Frenje, G. Hale, C. K. Li, M. Rubery, M. Paris, A. Bacher, C. R. Brune, C. Forrest, V. Yu. Glebov, R. Janezic, D. McNabb, A. Nikroo, J. Pino, T. C. Sangster, F. H. Séguin, W. Seka, H. Sio, C. Stoeckl, R. D. Petrasso, 2018, "Using Inertial Fusion Implosions to Measure the T + 3 He Fusion Cross Section at Nucleosynthesis-Relevant Energies", https://doi.org/10.7910/DVN/PC8YLN, Harvard Dataverse, V1
Light nuclei were created during big-bang nucleosynthesis (BBN). Standard BBN theory, using rates inferred from accelerator-beam data, cannot explain high levels of Li6 in low-metallicity stars. Using high-energy-density plasmas we measure the T(He3,?)Li6 reaction rate, a candidate for anomalously high Li6 production; we find that the rate is too l... |
Oct 25, 2018
K. Ida, Z. Shi, H.J. Sun, S. Inagaki, K. Kamiya, J.E. Rice, N. Tamura, P.H. Diamond, G. Dif-Pradalier, X.L. Zou, K. Itoh, S. Sugita, O.D. Gürcan, T. Estrada, C. Hidalgo, T.S. Hahm, U. Stroth, A. Field, X.T. Ding, Y. Sakamoto, S. Oldenbürger, M. Yoshinuma, T. Kobayashi, M. Jiang, S.H. Hahn, Y.M. Jeon, S. H. Hong, J. Dong, S.-I. Itoh, 2018, "Towards an Emerging Understanding of Non-local Transport", https://doi.org/10.7910/DVN/OVMWDZ, Harvard Dataverse, V1
In this paper, recent progress on experimental analysis and theoretical models for non-local transport (non-Fickian fluxes in real space) is reviewed. The non-locality in the heat and momentum transport observed in the plasma, the departures from linear flux-gradient proportionality, and externally triggered non-local transport phenomena are descri... |
Sergey A. Arsenyev, Richard J. Temkin, W. Brian Haynes, Dmitry Yu. Shchegolkov, Evgenya I. Simakov, Tsuyoshi Tajima, Chase H. Boulware, Terrence L. Grimm, Adam R. Rogacki, 2018, "Cryogenic testing of the 2.1 GHz five-cell superconducting RF cavity with a photonic band gap coupler cell", https://doi.org/10.7910/DVN/AYTW4V, Harvard Dataverse, V1
We present results from cryogenic tests of the multi-cell superconducting radio frequency (SRF) cavity with a photonic band gap (PBG) coupler cell. Achieving high average beam currents is particularly desirable for future light sources and particle colliders based on SRF energy-recovery-linacs (ERLs). Beam current in ERLs is limited by the beam bre... |
J. J. Ramos; R.L. White, 2018, "Normal-mode-based analysis of electron plasma waves with second-order Hermitian formalism", https://doi.org/10.7910/DVN/02RPRS, Harvard Dataverse, V1
The classic problem of the dynamic evolution of Langmuir electron waves in a collisionless plasma and their Landau damping is cast as a second-order, self-adjoint problem with a continuum spectrum of real and positive squared frequencies. The corresponding complete basis of singular normal modes is obtained, along with their orthogonality relation.... |
Oct 24, 2018
Peter J. Catto, 2018, "Ripple modifications to alpha transport in tokamaks", https://doi.org/10.7910/DVN/5ZYJS7, Harvard Dataverse, V1
Magnetic field ripple is inherent in tokamaks since the toroidal magnetic field is generated by a finite number of toroidal field coils. The field ripple results in departures from axisymmetry that cause radial transport losses of particles and heat. These ripple losses are a serious concern for alphas near their birth speed v0 since alpha heating... |
Nuno F. Loureiro, Stanislav Boldyrev, 2018, "Turbulence in Magnetized Pair Plasmas", https://doi.org/10.7910/DVN/JIR16L, Harvard Dataverse, V1
Alfvenic-type turbulence in strongly magnetized, low-beta pair plasmas is investigated. A coupled set of equations for the evolution of the magnetic and flow potentials are derived, covering both fluid and kinetic scales. In the fluid (MHD) range those equations are the same as for electron-ion plasmas, so turbulence at those scales is expected to... |
Oct 19, 2018
D.G. Whyte, J. Minervini, B. LaBombard, E. Marmar, L. Bromberg, M. Greenwald, 2018, "Smaller & Sooner – Exploiting high magnetic fields from new superconductors for a more attractive fusion energy development path", https://doi.org/10.7910/DVN/MATQQF, Harvard Dataverse, V1
The current fusion energy development path, based on large volume moderate magnetic B field devices is proving to be slow and expensive. A modest development effort in exploiting new superconductor magnet technology development, and accompanying plasma physics research at high-B, could open up a viable and attractive path for fusion energy developm... |
