Results 31 to 40 of about 468,934 (298)

Beam ion instability: Measurement, analysis, and simulation

Physical Review Special Topics. Accelerators and Beams, 2013
A weak vertical coupled-bunch instability with oscillation amplitude of the order of a few μm has been observed in SPEAR3 at nominal vacuum pressure. The instability becomes stronger with increasing neutral gas pressure as observed by turning off vacuum ...
L. Wang, J. Safranek, Y. Cai, J. Corbett, R. O. Hettel, T. O. Raubenheimer, J. Schmerge, J. Sebek   +7 more
doaj   +1 more source

Bending instability in galactic discs. Advocacy of the linear theory

, 2013
We demonstrate that in N-body simulations of isolated disc galaxies there is numerical vertical heating which slowly increases the vertical velocity dispersion and the disc thickness.
Rodionov, S. A., Sotnikova, N. Ya.
core   +3 more sources

The Dynamics of Rayleigh-Taylor Stable and Unstable Contact Discontinuities with Anisotropic Thermal Conduction [PDF]

, 2012
We study the effects of anisotropic thermal conduction along magnetic field lines on an accelerated contact discontinuity in a weakly collisional plasma.
Balbus, Balsara, Balsara, Berger, Birnboim, Braginskii, Chandrasekhar, Chevalier, Cunningham, Daniel Lecoanet, Dimonte, Dong, Eliot Quataert, Gardiner, Gull, Ian J. Parrish, Isobe, Jun, McCourt, Orlando, Parrish, Parrish, Parrish, Parrish, Quataert, Robinson, Sedov, Sharma, Spitzer, Stone, Stone, Tilley, Vikhlinin   +32 more
core   +1 more source

Buckling instability in tidally induced galactic bars

, 2019
Strong galactic bars produced in simulations tend to undergo a period of buckling instability that weakens and thickens them and forms a boxy/peanut structure in their central parts.
Lokas, Ewa L.
core   +1 more source

Two-Dimensional Hydrodynamic Simulations of Convection in Radiation-Dominated Accretion Disks [PDF]

, 2001
The standard equilibrium for radiation-dominated accretion disks has long been known to be viscously, thermally, and convectively unstable, but the nonlinear development of these instabilities---hence the actual state of such disks---has not yet been ...
Bisnovatyi-Kogan G. S., Eric Agol, Fujita M., Garabedian P., James M. Stone, Julian Krolik, Lominadze D. G., Milsom J. A., Neal J. Turner, Robertson J. A., Shakura N. I., Shakura N. I., Shakura N. I.   +12 more
core   +2 more sources

Investigation of APS PAR Vertical Beam Instability [PDF]

Proceedings of the 2005 Particle Accelerator Conference, 2006
A vertical beam instability has been observed for some time in the particle accumulator ring (PAR) of APS. It appears at low beam current when a single linac bunch is selected for PAR injection and is highly reproducible. An investigation was conducted to characterize and understand this instability.
C.Y. Yao, Y. Chae, N.S. Sereno, B. Yang
openaire   +1 more source

Vertical Exchange Induced by Mixed Layer Instabilities

Journal of Physical Oceanography, 2023
Abstract Submesoscale turbulence in the upper ocean consists of fronts, filaments, and vortices that have horizontal scales on the order of 100 m to 10 km. High-resolution numerical simulations have suggested that submesoscale turbulence is associated with strong vertical motion that could substantially enhance the vertical exchange between the ...
Yangcheng Luo, Jörn Callies
openaire   +3 more sources

Beam instability induced by rf deflectors in the combiner ring of the CLIC test facility and mitigation by damped deflecting structures

Physical Review Special Topics. Accelerators and Beams, 2011
In the CTF3 (CLIC test facility 3) run of November 2007, a vertical beam instability has been found in the combiner ring during operation. After a careful analysis, the source of the instability has been identified in the vertical deflecting modes ...
David Alesini, Caterina Biscari, Andrea Ghigo, Fabio Marcellini, Roberto Corsini   +4 more
doaj   +1 more source

Chaotic and regular motion around generalized Kalnajs discs [PDF]

, 2008
The motion of test particles in the gravitational fields generated by the first four members of the infinite family of generalized Kalnajs discs, is studied.
Benettin, Binney, Brandt, Brandt, Framsol López-Suspes, González, Guillermo A. González, Hunter, Hunter, Javier Ramos-Caro, Kalnajs, Kuzmin, Martinet, Martinet, Martinet, Mayer, Ostriker, Schmidt, Toomre, Toomre, Wyse   +20 more
core   +2 more sources

Effects of non-rigidity on fast plasma boundary control using in-vessel coils in JT-60SA

Nuclear Fusion
An effective fast plasma position control (FPPC) method using in-vessel poloidal field coils and capable of maintaining high-elongation plasma, and hence high vertical instability growth, was developed utilizing an magneto-hydrodynamic equilibrium ...
Shinichiro Kojima, Shizuo Inoue, Yoshiaki Miyata, Hajime Urano, Takahiro Suzuki   +4 more
doaj   +1 more source