Organization: Physics (PH)
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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.
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Publication 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.); PhysicsAs 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 bunchesPublication 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.); PhysicsMeasurement 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 linacPublication 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); PhysicsAt 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)Publication Emission threshold for Cerenkov radiation(Monterey, CA; Naval Postgraduate School, 1985) 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