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1 to 10 of 79 Results
Dec 18, 2018
Sergey A. Arsenyev, Richard J. Temkin, Dmitry Yu. Shchegolkov, Evgenya I. Simakov, Chase H. Boulware, Terry L. Grimm, Adam R. Rogacki, 2018, "Higher Order Mode Damping in a Five-cell Superconducting RF Cavity with a PBG Coupler Cell", https://doi.org/10.7910/DVN/SHTTPN, Harvard Dataverse, V1
We present a study of higher order mode (HOM) damping in the first multi-cell superconducting radio frequency (SRF) cavity with a photonic band gap (PBG) coupler cell. Achieving higher average beam currents is particularly desirable for future light sources and particle colliders...
Dec 18, 2018
V. Aslanyan, S. E. Sharapov, D. A. Spong, M. Porkolab, 2018, "Two species drag/diffusion model for energetic particle driven modes", https://doi.org/10.7910/DVN/EJW3KO, Harvard Dataverse, V1
A nonlinear bump-on-tail model for the growth and saturation of energetic particle driven plasma waves has been extended to include two populations of fast particles—one dominated by dynamical friction at the resonance and the other by velocity space diffusion. The resulting temp...
Dec 18, 2018
Ye. O. Kazakov, J. Ongena, J. C. Wright, S. J. Wukitch, E. Lerche, M. J. Mantsinen, D. Van Eester, T. Craciunescu, V. G. Kiptily, Y. Lin, M. Nocente, F. Nabais, M. F. F. Nave, Y. Baranov, J. Bielecki, R. Bilato, V. Bobkov, K. Crombé, A. Czarnecka, J. M. Faustin, R. Felton, M. Fitzgerald, D. Gallart, L. Giacomelli, T. Golfinopoulos, A. E. Hubbard, Ph. Jacquet, T. Johnson, M. Lennholm, T. Loarer, M. Porkolab, S. E. Sharapov, D. Valcarcel, M. Van Schoor, H. Weisen, The Alcator C-Mod Team Jet Contributors, 2018, "Efficient generation of energetic ions in multi-ion plasmas by radio-frequency heating", https://doi.org/10.7910/DVN/6HYPWP, Harvard Dataverse, V1
We describe a new technique for the efficient generation of high-energy ions with electromagnetic ion cyclotron waves in multi-ion plasmas. The discussed ‘three-ion’ scenarios are especially suited for strong wave absorption by a very low number of resonant ions. To observe this...
Dec 12, 2018
Xueying Lu, Michael A. Shapiro, Richard J. Temkin, 2018, "Modeling of the interaction of a volumetric metallic metamaterial structure with a relativistic electron beam", https://doi.org/10.7910/DVN/A8DDP4, Harvard Dataverse, V1
We present the design of a volumetric metamaterial (MTM) structure and its interaction with a relativistic electron beam. This novel structure has promising applications in particle beam diagnostics, acceleration and microwave generation. The volumetric MTM has a cubic unit cell...
Dec 7, 2018
P.J. Catto, F.I. Parra, I. Pusztai, 2018, "Electromagnetic zonal flow residual responses", https://doi.org/10.7910/DVN/EGVIGL, Harvard Dataverse, V1
The collisionless axisymmetric zonal flow residual calculation for a tokamak plasma is generalized to include electromagnetic perturbations. We formulate and solve the complete initial value zonal flow problem by retaining the fully self-consistent axisymmetric spatial perturbati...
Dec 7, 2018
Brian J. Munroe, JieXi Zhang, Haoran Xu, Michael A. Shapiro, Richard J. Temkin, 2018, "Experimental high gradient testing of a 17.1 GHz photonic band-gap accelerator structure", https://doi.org/10.7910/DVN/SATGTO, Harvard Dataverse, V1
We report the design, fabrication and high gradient testing of a 17.1 GHz Photonic Band Gap accelerator structure. Photonic band-gap (PBG) structures are promising candidates for electron accelerators capable of high-gradient operation because they have the inherent damping of hi...
Dec 7, 2018
Philip C. Michael, Jiho Lee, John Voccio, Juan Bascuñán, Seungyong Hahn, Yukikazu Iwasa, 2018, "A REBCO Persistent-Current Switch, Immersed in Solid Nitrogen, Operating at Temperatures near 10 K", https://doi.org/10.7910/DVN/HUQDFI, Harvard Dataverse, V1
We present design and test results for a thermally-activated persistent-current switch (PCS) applied to a double pancake (DP) coil (151 mm ID, 172 mm OD), wound, using the no-insulation (NI) technique, from a 120-m long, 76-µm thick, 6-mm wide REBCO tape. For the experiments repo...
Dec 7, 2018
JieXi Zhang, Brian J. Munroe, Haoran Xu, Michael A. Shapiro, Richard J. Temkin, 2018, "High power experimental studies of hybrid photonic band gap accelerator structures", https://doi.org/10.7910/DVN/CIVVN6, Harvard Dataverse, V1
This paper reports the first high power tests of hybrid Photonic Band Gap (PBG) accelerator structures. Three hybrid PBG (HPBG) structures were designed, built and tested at 17.14 GHz. Each structure had a triangular lattice array with 60 inner sapphire rods and 24 outer copper r...
Dec 6, 2018
M. Gatu Johnson, B.D. Appelbe, J.P. Chittenden, J. Delettrez, C. Forrest, J.A. Frenje, V.Yu. Glebov, W. Grimble, B.M. Haines, I. Igumenshchev, R. Janezic, J.P. Knauer, B. Lahmann, F. Marshall, T. Michel, F.H. Séguin, C. Stoeckl, C. Walsh, A.B. Zylstra, R.D. Petrasso, 2018, "Impact of asymmetries on fuel performance in Inertial Confinement Fusion", https://doi.org/10.7910/DVN/COHAXG, Harvard Dataverse, V1, UNF:6:sjUykJE2xZgAIDFUYR9H/A== [fileUNF]
Low-mode asymmetries prevent effective compression, confinement and heating of the fuel in inertial confinement fusion (ICF) implosions and their control is essential to achieving ignition. Ion temperatures (Tion) in ICF experiments are inferred from the broadening of primary neu...
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...
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