Organization:
Physics (PH)

Description

The mission of the Physics Department is to provide defense-relevant, advanced education and research programs to meet Naval unique needs, and increase the warfighting effectiveness of the U.S. Naval Forces, DoD and allied armed forces.

Website of the organization

https://nps.edu/web/physics

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Publication Search Results

Now showing 1 - 10 of 22

Shipboard observations of mean and turbulent atmospheric surface layer quantities SCCCAMP data report, Part I
(Monterey, CA; Naval Postgraduate School, 1986-05) Skupniewicz, C. E.; Borrmann, S.; Fellbaum, C.; Shaw, William J.; Vaucher, Christopher A.; Vaucher, Gail M. Tirrell; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Naval Postgraduate School (U.S.); Dept. of Physics
3 Weeks of aerometric observations from a shipboard platform are described and analyzed to obtain surface layer quantities relevant to the dispersion of pollutants from offshore oil operations. Momentum, heat, and moisture flux were estimated with two different methods: the dissipation technique and bulk parameterizations. Diffusion scale turbulence was measured with bivane anemometers and estimates of ship motion contributions to these measurements were performed. Keywords: Turbulence diffusion; Measurements; and Santa Barbara Channel. (Author)
Review of interactions between the Naval Postgraduate School and the Naval Undersea Warfare Engineering Station, 1973-1986
(Monterey, CA; Naval Postgraduate School, 1986-06) Marimon, R. L.; Wilson, O. B. (Oscar Bryan); Esary, James Daniel; Uber, Brian; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Naval Postgraduate School (U.S.); Dept. of Operations Research
Radiation from intense electron beams associated with the Cerenkov mechanism
(Monterey, CA; Naval Postgraduate School, 1984-06-01) Neighbours, John R.; Buskirk, Fred R.; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Naval Postgraduate School (U.S.); Dept. of Physics
Cerenkov and sub-Cerenkov radiation from a charged particle beam
(Monterey, CA; Naval Postgraduate School, 1987) Neighbours, John R.; Buskirk, Fred R.; Maruyama, Xavier K.; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Naval Postgraduate School (U.S.); Physics
As a consequence of the relaxation of the phasing conditions between the moving charge and radiated wave for finite beam path lengths, the Cerenkov peak is broadened and the threshold energy is developed which is applicable to charged beams consisting of single point charge or charge bunch of finite size, as well as beams consisting of periodically repeated bunches
Laser altimeter for use over the ocean
(Monterey, California. Naval Postgraduate School, 1989-04) Bourne, Carlton M.; Crittenden, Eugene Casson; Rodeback, George Wayne; Cooper, Alfred William; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Physics
A perturbation theory for light diffraction from a bigrating with multiple surface-polariton excitation
(Monterey, CA; Naval Postgraduate School, 1986-12) Glass, Nathaniel E.; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Naval Postgraduate School (U.S.); Dept. of Physics
A perturbation theory has recently been developed for treating the diffration of light, with surface polariton resonant excitation, from a bigrating surface. The theory is an approximation, to first order in the grating height, of an earlier theory based on the Rayleigh hypothesis. The perturbation theory holds for arbitrary polarization and for arbitrary plane of incidence with respect to the grating directions. It is, however, limited to treating only the possibility of two simultaneous resonant evanescent waves, whereas four are possible at normal incidence on a square grating, and three are possible on a rectangular grating. The present work generalizes the earlier work to allow for a four fold (or three fold) resonance. This extension also allows one now to determine the complex dispersion relation for surface-polaritons, for wavevectors at the intersection of two Brillouin zone boundary lines (not possible in the previous formulation). Keywords: Smith Purcell radiation; Bigrating; Grating; Surface plasmon; Polariton
Charging characteristics of Dynamic Explorer I Retarding Ion Mass Spectrometer and the consequence for core plasma measurements
(Monterey, California. Naval Postgraduate School, 1989-09) Olsen, Richard Christopher; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Physics
The Retarding Ion Mass Spectrometer (RIMS) on the Dynamics Explorer I (DE I) satellite has provided a new range of data, and challenges for studies of the core plasma of the magnetosphere. Analysis of the RIMS data provides a measure of the satellite potential in the inner magnetosphere. As the satellite leaves the inner plasmasphere, it begins to charge positively, crossing the 0 V mark at about 1000/cc. The potential rises slowly initially, reaching about 1 V near the plasmapause, at the 100/cc point. At lower densities, the potential rises relatively rapidly, reaching +5 V or greater at the 10/cc point. For satellite potentials of +1 to +5 V, portions of the ion distribution function are lost to measurement because the ions are repelled by the satellite. In particular, in a multi-temperature plasma, the cold component is easily lost in this potential (density) regime. It is in this regime where aperture bias techniques have been successfully used, particularly in measurements of field- aligned ion flows such as the polar wind, which have sufficient kinetic energy to overcome electrostatic barriers in front of the aperture plane. At lower densities (<10/cc), the satellite potential can exceed +5 V. At such potentials the core plasma is lost to the RIMS, and even the aperture bias techniques are no lower successful. Keywords: Spacecraft charging; Thermal plasmas; Mass spectrometry. (EDC)
Air parcel motion at the Vandenberg hydrogen flare stacks
(Monterey, California. Naval Postgraduate School, 1985-10) Schacher, G. E. (Gordon Everett); Skupniewicz, C. E.; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Dept. of Physics
Observation of microwave Cerenkov radiation as a diffraction pattern
(Monterey, CA; Naval Postgraduate School, 1985-08-01) Maruyama, Xavier K.; Neighbours, John R.; Buskirk, Fred R.; Snyder, D. D.; Bruce, Robert G.; Vujaklija, Milorad; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Naval Postgraduate School (U.S.); Physics
Measurement of microwave Cerenkov radiation in air exhibits the diffraction pattern predicted in earlier work. The radiation appears only at harmonics of the frequency of periodic electron bunches, angular distribution power measurements are presented for frequencies of 2.86, 5.71, 8.57 and 11 & 12 GHz corresponding to the fundamental and the first three harmonics of an S band RF linac
Frequency content of coherent Cherenkov radiation
(Monterey, California. Naval Postgraduate School, 1989-11) Neighbours, John R.; Buskirk, Fred R.; Maruyama, Xavier K.; Physics (PH); Graduate School of Operational and Information Sciences (GSOIS); Physics
At constant beam energy and propagation angle, the coherent radiation from a charged particle beam is a function of frequency only. The intensity of the radiation oscillates with a frequency dependent on length of the path of the beam and is modulated by the form factor corresponding to the shape of an individual charge bunch. Calculations are presented for line charge distributions which have rectangular, triangular, and trapezodial axial variation. A point charge distribution is also considered for comparison. Keywords: Radiation from electron beam; Cherenkov radiation. (jhd)