Active Stark Atomic Spectroscopy (ASAS) method can be used to determine the electric field in the diode of an ion or electron accelerator as a function of position and time, including the positions of anode and cathode plasma emission surfaces (in order to obtain the effective accelerating gap). As possible probe beams, we suggest the use of lithium and sodium atoms. The diagnostic provides a m...

The ongoing development of the Variable Specific Impulse Magnetoplasma Rocket (VASIMR) involves basic physics analysis of its three major components: helicon plasma source, ion cyclotronresonance heating (ICRH) module, and magnetic nozzle. This paper presents an overview of recent theoretical efforts associated with the project. It includes: 1) a first-principle model for helicon plasma source,...

Articles you may be interested in Dependence of electron trapping on bubble geometry in laser-plasma wakefield acceleration Self-truncated ionization injection and consequent monoenergetic electron bunches in laser wakefield acceleration Phys. Enhancement of injection and acceleration of electrons in a laser wakefield accelerator by using an argon-doped hydrogen gas jet and optically preformed ...

ITER will be the first fusion reactor and the 50 year old dream of fusion scientists will become reality. The quality of magnetic confinement will decide about the success of ITER, directly in the form of the confinement time and indirectly because it decides about the plasma parameters and the fluxes, which cross the separatrix and have to be handled externally by technical means. This lecture...

R. L. Dewar, A. Bhattacharjee, R. M. Kulsrud, and A. M. Wright Plasma Research Laboratory, Research School of Physics and Engineering, The Australian National University, Canberra ACT 0200, Australia and Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba 277-8561, Japan Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543, USA The Australian Nati...

An on-axis plasma density depression channel was observed during and after the passage of a relativistically and ponderomotively self-guided laser pulse through a plasma. Optical interferometry was used to produce time-resolved plasma density distributions, revealing the formation of a plasma waveguide. These results were complemented by the guiding of a collinear trailing pulse. [S0031-9007(98...

We introduce a novel two-degree-of-freedom haptic display capable of reproducing the sensation of sliding contact on a fingertip. The modular device can be attached to a PHANTOM haptic interface and generates tactile sensations by actuating a ball positioned under the user’s index finger. Specifications for the device and mechanical design considerations are presented. Integration of the slip d...

A study is reported of target acquisition in 3D using a head coupled stereo display and a hand tracking device. The effects of lag and frame rate were studied by introducing lag in three different ways: by queuing the hand input and delivering it to the cursor an integer number of frames later, by increasing the frame interval and sampling the input device at the start of the display interval, ...