Now showing items 11-20 of 136
Nonstationary behavior of collisionless shocks
(American Physical Society, 1972-01-03)
Laboratory measurements indicate that a collisionless shock wave formed in a plasma-wind- tunnel device is nonstationary on the time scale of the ion gyroperiod. This behavior suggests a possible interpretation of recent ...
High power operation of a wiggler-focused sheet beam free electron laser amplifier
The proof-of-principle millimeter-wave free electron laser amplifier at the University of Maryland has been operated at an input power level of N 1 kW at a frequency of 86 GHz, following successful operation at smaller ...
Laboratory Simulation of Artificial Plasma Clouds in the Ionosphere
(American Geophysical Union, 1973)
The results of an experiment to model the behavior of artificial plasma clouds in the ionosphere are presented. The formation of field-aligned structure or striations is frequently observed. The appearance of this structure ...
Experimental demonstration of an electromagnetically pumped free-electron laser with a cyclotron-harmonic idler
(American Physical Society, 1988)
A three-wave, free-electron laser was operated with a powerful 8.4-GHz electromagnetic "pump" wave replacing the usual magnetostatic wiggler. The presence of a uniform axial magnetic field Bo produced cyclotron-harmonic ...
New modes in a plasma with periodic boundaries: the origin of the dense spectrum
(The American Physical Society, 1991-10-28)
We analyze the new features of the low-frequency (£0 < £Op) modes of wave propagation in a plasma filled, spatially periodic structure. The spectrum of these modes is drastically modified by the periodic boundaries in a ...
Small-period electromagnet wigglers for free-electron lasers
(American Institute of Physics, 1985-09-15)
A new configuration for wiggler magnets compatible with free-electron laser (FEL) deployment is described and demonstrated experimentally. The configuration is simple and inexpensive to fabricate and allows for continuous ...
Protocols for Academic Centers (Revised Draft)
Studies of ion acceleration in a one meter laser controlled collective accelerator
(Institute of Electrical and Electronics Engineers, 1991)
The basic concept behind the Laser Controlled Beamfront Experiment has been described in detail in previous reports(1,2) In the experiment, control over the propagation of a virtual cathode at the front of an intense ...
Collective ion acceleration via laser controlled ionization channel
(Institute of Electrical and Electronics Engineers, 1987)
Initial results from a successful laser-controlled collective ion acceleration experiment at the University of Maryland are presented. In the experiment, positive ions are trapped in the potential well at the head of ...
Strategic Plan Documents