501 to 510 of 570 Results
Dec 5, 2018
S. C. Schaub, J. S. Hummelt, W. C. Guss, M. A. Shapiro, R. J. Temkin, 2018, "Electron density and gas density measurements in a millimeter-wave discharge", https://doi.org/10.7910/DVN/0ZADQU, Harvard Dataverse, V1
Electron density and neutral gas density have been measured in a non-equilibrium air breakdown plasma using optical emission spectroscopy and two-dimensional laser interferometry, respectively. A plasma was created with a focused high frequency microwave beam in air. Experiments were run with 110 GHz and 124.5 GHz microwaves at powers up to 1.2 MW.... |
Dec 5, 2018
Paul Woskov, 2018, "Millimeter-Wave Directed Energy Deep Boreholes", https://doi.org/10.7910/DVN/TLZA4F, Harvard Dataverse, V1, UNF:6:YvX3yrnrpmH1/AOs5L4fzA== [fileUNF]
The analytic basis of high temperature, full bore directed energy opening in rock is presented including energy requirements, rates of penetration, high temperature physics replacement of drilling mud, and diameter control. Millimeter-waves are ideally suited for long distance, high power guided transmission into typical borehole dimensions, but de... |
Dec 5, 2018
Seungyong Hahn, Kwangmin Kim, Kwanglok Kim, Haigun Lee, Yukikazu Iwasa, 2018, "Current Status of and Challenges for No-Insulation HTS Winding Technique", https://doi.org/10.7910/DVN/RTMQWH, Harvard Dataverse, V1
In this paper we summarize what we have learned so far and discuss key technical challenges that face the HTS “NI” magnet wound with the no-insulation (NI) technique, focusing one of its beneficial features, self-protecting. We first describe the basic features of the NI winding technique, including lumped circuit and distributed network models. Ne... |
Dec 5, 2018
Fei Liang, Timing Qu, Zhenyu Zhang, Weijia Yuan, Yukikazu Iwasa, Min Zhang, 2018, "Vortex shaking study of REBCO tape with consideration of anisotropic characteristics", https://doi.org/10.7910/DVN/9WPAU8, Harvard Dataverse, V1
The second generation high temperature superconductor, specifically REBCO, has become a new research focus in the development of high-field (>25T) magnets. Previous research shows that for magnetized superconducting stacks and bulks the application of an AC field in plane with the circulating current will lead to demagnetization due to vortex shaki... |
R.A. Tinguely, R.S. Granetz, M. Hoppe, O. Embreus, 2018, "Spatiotemporal evolution of runaway electrons from synchrotron images in Alcator C-Mod", https://doi.org/10.7910/DVN/SO9QYL, Harvard Dataverse, V1, UNF:6:H9t1q6izeNVskcUMm4ytZQ== [fileUNF]
In the Alcator C-Mod tokamak, relativistic runaway electron (RE) generation can occur during the flattop current phase of low density, diverted plasma discharges. Due to the high toroidal magnetic field (B0 = 5.4 T), RE synchrotron radiation is measured by a wide-view camera in the visible wavelength range (~400-900 nm). In this paper, a statistica... |
Dec 4, 2018
Vadim Roytershteyn, Stanislav Boldyrev, Gian Luca Delzanno, Christopher H. K. Chen, Daniel Groselj, Nuno F. Loureiro, 2018, "Numerical Study of Inertial Kinetic-Alfven Turbulence", https://doi.org/10.7910/DVN/C5U78M, Harvard Dataverse, V1
Recent observational and analytical studies suggested that a new regime of kinetic turbulence may exist in plasma environments with low electron beta (Chen & Boldyrev 2017). Such a regime, termed inertial kinetic-Alfven turbulence, is relevant for the solar corona, Earth's magnetosheath, and other astrophysical systems where the electron and ion pl... |
R. Jorge, P. Ricci, S. Brunner, S. Gamba, V. Konovets, N. F. Loureiro, L. M. Perrone, N. Teixeira, 2018, "Linear Theory of Electron-Plasma Waves at Arbitrary Collisionality", https://doi.org/10.7910/DVN/LOAT9C, Harvard Dataverse, V1
The dynamics of electron-plasma waves are described at arbitrary collisionality by considering the full Coulomb collision operator. The description is based on a Hermite- Laguerre decomposition of the velocity dependence of the electron distribution function. The damping rate, frequency, and eigenmode spectrum of electron-plasma waves are found as... |
J. A. Frenje, R. Florido, R. Mancini, T. Nagayama, P. E. Grabowski, H. Rinderknecht, H. Sio, A. Zylstra, M. Gatu Johnson, C. K. Li, F. H. Séguin, R. D. Petrasso, V. Yu Glebov, S. P. Regan, 2018, "Experimental Validation of Low-Z Ion-Stopping Formalisms Around the Bragg Peak in High-Energy-Density Plasmas", https://doi.org/10.7910/DVN/YT5BVD, Harvard Dataverse, V1, UNF:6:jhVoh3W+DyWZxz7Qb3gSvQ== [fileUNF]
We report on the first accurate validation of low-Z ion-stopping formalisms in the regime ranging from low-velocity ion stopping – through the Bragg peak – to high-velocity ion stopping in well-characterized High-Energy-Density Plasmas. These measurements were executed at electron temperatures and number densities in the range of 1.4 – 2.8 keV and... |
A. Marinoni, R. I. Pinsker, M. Porkolab, J. C. Rost, E. M. Davis, K. H. Burrell, J. Candy, G. M. Staebler, B. A. Grierson, G. R. McKee, T. L. Rhodes, the DIII-D Team, 2018, "The effect of electron cyclotron heating on density fluctuations at ion and electron scales in ITER baseline scenario discharges on the DIII-D tokamak", https://doi.org/10.7910/DVN/5FVDQ1, Harvard Dataverse, V1
Experiments simulating the ITER Baseline Scenario on the DIII-D tokamak show that torque-free pure electron heating, when coupled to plasmas subject to a net co-current beam torque, affects density fluctuations at electron scales on a sub-confinement time scale, whereas fluctuations at ion scales change only after profiles have evolved to a new sta... |
C.E. Parker, J.A. Frenje, M. Gatu Johnson, D.J. Schlossberg, H.G. Reynolds, L. Berzak Hopkins, R. Bionta, D.T. Casey, S.J. Felker, T.J. Hilsabeck, J.D. Kilkenny, C.K. Li, A.J. Mackinnon, H. Robey, M.E. Schoff, F.H. Seguin, C.W. Wink, R.D. Petrasso, 2018, "Implementation of the foil-on-hohlraum technique for the magnetic recoil spectrometer for time-resolved neutron measurements at the National Ignition Facility", https://doi.org/10.7910/DVN/IRS1RV, Harvard Dataverse, V1, UNF:6:QcB2542Mk6i55IhhzPSPqQ== [fileUNF]
The next-generation Magnetic Recoil Spectrometer, called MRSt, will provide time-resolved measurements of the DT-neutron spectrum from Inertial Connement Fusion (ICF) implosions at the National Ignition Facility (NIF). These measurements will provide critical information about the time evolution of the fuel assembly, hot-spot formation, and nuclear... |
