Results 41 to 50 of about 8,033 (175)

Dynamical diffraction in sinusoidal potentials: uniform approximations for Mathieu functions [PDF]

, 2000
Eigenvalues and eigenfunctions of Mathieu's equation are found in the short wavelength limit using a uniform approximation (method of comparison with a `known' equation having the same classical turning point structure) applied in Fourier space.
Abramowitz M, Ancey S, Berry M V, Berry M V, Berry M V, Berry M V, Berry M V, Berry M V, Brillouin L, Cohen-Tannoudji C, D H J O'Dell, Dingle R B, Dingle R B, Dingle R B, Gradshteyn I S, Kazantsev A P, O'Dell D H J, O'Dell D H J, Olver F W J, Raman C V, Raman C V, Sanders F H, Sieber M, Yakovlev V P   +23 more
core   +2 more sources

Electron transport barrier and high confinement in configurations with internal islands close to the plasma edge of W7-X

Nuclear Fusion
The low magnetic shear in the Wendelstein 7-X (W7-X) stellarator makes it feasible to shape the separatrix by the large islands constituting an island-divertor, and this can be exploited to access various magnetic configurations, including samples of ...
N. Chaudhary, M. Hirsch, T. Andreeva, J. Geiger, R.C. Wolf, G.A. Wurden, the W7-X Team   +6 more
doaj   +1 more source

May 12 1997 Cme Event: I. a Simplified Model of the Pre-Eruptive Magnetic Structure

, 2007
A simple model of the coronal magnetic field prior to the CME eruption on May 12 1997 is developed. First, the magnetic field is constructed by superimposing a large-scale background field and a localized bipolar field to model the active region (AR) in ...
J. A. Linker, Pontin D. I., R. Lionello, Titov V. S., Titov V. S., V. S. Titov, Z. Mikic   +6 more
core   +1 more source

Chaotic Friedmann-Robertson-Walker Cosmology [PDF]

, 1992
We show that the dynamics of a spatially closed Friedmann - Robertson - Walker Universe conformally coupled to a real, free, massive scalar field, is chaotic, for large enough field amplitudes. We do so by proving that this system is integrable under the
, , Amendola L, Arnold V I, Arnold V I, Arnold V I, Barrow J D, Belinskii V A, Berger B K, Berger B K, Berry M, Bombelli L, Buchler J R, Buchler J R, Buchler J R, Buchler J R, Burd A, Burd A, Burd A, C El Hasi, Chitre D M, Contopoulos G, Contopoulos G, Contopoulos G, Courant R, Demianski M, E Calzetta, Francisco G, Gottlober S, Guckenheimer J, Gurzadyan V, Hartle J, Hawking S, Hobill D, Hobill D, Khalatnikov I M, Landau L, McCracken D, Misner C, Misner C W, Ornstein D, Ozorio de Almeida A M, Page D, Prigogine I, Pullin J, Reichl L E, Rey Pastor J, Rugh S E, Ryan M, Ryan M, Shields P, Tavakol R K, Whittaker E, Wiggins S, Wolf A, Zaslavsky G M   +55 more
core   +2 more sources

Impact of the plasma boundary on machine operation and the risk mitigation strategy on JET

Nuclear Fusion
This work examines the separatrix and Scrape-off-Layer (SOL) characteristics in three scenarios on JET: the Quasi-Continuous Exhaust (QCE) regime, the ITER Baseline scenario, and the X-point Radiator (XPR) regime.
H.J. Sun, P.J. Lomas, G.F. Matthews, E. Lerche, M. Faitsch, C. Giroud, D. King, M. Bernert, M. Dunne, L. Frassinetti, P. Ryan, S. Henderson, O. Sauter, E. Viezzer, S. Wiesen, D.L. Keeling, C. Perez von Thun, I.S. Carvalho, C.G. Lowry, M. Lennholm, P. Jacquet, M. Maslov, F.G. Rimini, B. Labit, M. Baruzzo, S. Silburn, D. Kos, Z.J. Huang, E.R. Solano, A. Meigs, I. Coffey, A. Boboc, P. Carvalho, D.C. McDonald, N. Vianello, A. Kappatou, M. Wischmeier, J. Mailloux, JET Contributors, the EUROfusion Tokamak Exploitation Team   +39 more
doaj   +1 more source

Experimental investigation of steady state power balance in double null and single null H mode plasmas in MAST Upgrade

Nuclear Materials and Energy
Global power balance calculations in steady state H mode plasmas varying the distance between separatrices (drsep) and the divertor configuration have been performed in MAST Upgrade.
J. Lovell, S.S. Henderson, J.M. Stobbs, A. Kirk, F. Federici, B.S. Patel, P.J. Ryan, J.R. Harrison, B.A. Lomanowski, J.D. Lore   +9 more
doaj   +1 more source

Preliminary analysis of the efficiency of non-standard divertor configurations in DEMO

Nuclear Materials and Energy, 2017
The standard Single Null (SN) divertor is currently expected to be installed in DEMO. However, a number of alternative configurations are being evaluated in parallel as backup solutions, in case the standard divertor does not extrapolate successfully ...
F. Subba, L. Aho-Mantila, R. Ambrosino, D.P. Coster, V. Pericoli-Ridolfini, A. Uccello, R. Zanino   +6 more
doaj   +1 more source

Interchange Slip-Running Reconnection and Sweeping SEP Beams [PDF]

, 2011
We present a new model to explain how particles (solar energetic particles; SEPs), accelerated at a reconnection site that is not magnetically connected to the Earth, could eventually propagate along the well-connected open flux tube.
A.K. Al-Hachami, B.C. Low, C.E. Parnell, C.H. Mandrini, D.I. Pontin, D.V. Reames, E. Pariat, E. Pariat, E.E. Chollet, E.R. Priest, E.W. Cliver, F. Moreno-Insertis, G. Aulanier, G. Aulanier, G. Aulanier, G. Aulanier, G. Aulanier, G. Del Zanna, G. Newkirk Jr., G. Wibberenz, G. Wibberenz, G.C. Reid, G.J. Rickard, H.V. Cane, J.J. Aly, J.K. Edmondson, J.W. Cirtain, K. Galsgaard, K. Klein, K. Shibata, K.-L. Klein, K.J. Rosdahl, M. Kallenrode, M. Pick, N.V. Nitta, P. Démoulin, P. Démoulin, P.K. Browning, R. Grappin, R. Reinhard, R.P. Lin, S. Masson, S. Masson, S.K. Antiochos, S.K. Antiochos, T. Török, V.S. Titov, W. Dröge, Y. Lau, Y. Lau, Y. Wang, Y. Wang, Y. Wang, Y.E. Litvinenko   +53 more
core   +4 more sources

Simulations of High Harmonic Fast Wave Heating on the C-2U Advanced Beam-Driven Field-Reversed Configuration Device

EPJ Web of Conferences, 2017
Numerous efforts have been made at Tri-Alpha Energy (TAE) to theoretically explore the physics of microwave electron heating in field-reversed configuration (FRC) plasmas. For the fixed 2D profiles of plasma density and temperature for both electrons and
Yang Xiaokang, Petrov Yuri, Ceccherini Francesco, Koehn Alf, Galeotti Laura, Dettrick Sean, Binderbauer Michl   +6 more
doaj   +1 more source

Assessment of the 3D geometrical effects on the DEMO divertor pumping efficiency

Nuclear Materials and Energy, 2019
In the present work, a parametric analysis by using the DIVGAS code is performed in order to highlight the influence of the inter-cassette gaps and the existence of the dome on the overall pumping efficiency of the DEMO divertor.
S. Varoutis, Yu. Igitkhanov, Chr. Day
doaj   +1 more source