William W. Destler (2007 - ): Recent submissions
Now showing items 81-100 of 111
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Experiemental study of interaction of microwaves with a nonmagnetized pulsed-plasma column
(American Institute of Physics, 1992-09-01)The time evolution of backscattered and sidescattered microwaves from a plane conductor covered by a pulsed-plasma column has been studied; transmitted signals along the axial and transverse directions of the column have ... -
Periodic magnetic focusing of sheet electron beams
(American Institute of Physics, 1994-05)Sheet electron beams focused by periodically cusped magnetic (PCM ) fields are stable against low-frequency velocity-shear instabilities (such as the diocotron mode). This is in contrast to the more familiar unstable ... -
High-power microwave generation from large-orbit devices
(IEEE, 1988-04)Experimental and theoretical studies at the University of Maryland on the production of high-power microwave radiation in cusp-injected, large-orbit devices are reviewed. Three classes of devices belonging to this ... -
Collective acceleration and the propagation of intense beams into vacuum
(IEEE, 1985-10) -
Single particle and collective effects observed in the electron beam of the Maryland era experiment
(IEEE, 1975-06)The formation of rotating, relativistic electron beams with properties suitable for collective ion acceleration has been studied under a variety of experimental conditions. A straight, cylindrical, relativistic electron ... -
Experimental and numerical studies of sheet electron beam propagation through a planar wiggler magnet
(IEEE, 1993-12)Detailed experimental studies on sheet relativistic electron beam propagation through a long planar wiggler are reported and compared with numerical simulations. The planar wiggler has 56 periods with a period of 9.6 ... -
Characterization of electron beams generated in a high-voltage pulse-line-driven pseudospark discharge
(American Institute of Physics, 1994-05-01)Emittance and energy measurements have been performed on a high-brightness electron beam (>1010Nm2 rad2 ) with diameter in the range 1-3 mm and energy in the range 150-170 keY. This electron beam is generated by the ... -
Experimental realization of millimeter-wave amplification by a sheet beam free electron laser
(American Institute of Physics, 1994-03-14)We report an observation of millimeter-wave (94 GHz) amplification in a sheet beam, short period, planar wiggler: free electron laser amplifier. The observed gain is about 5 dB for a 530 keV, 4 A beam through a 54 cm ... -
The Axially modulated, cusp-injected, large-orbit gyrotron amplifier
(©1994 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE., 1994-10)We introduce a novel hybrid microwave amplifier that utilizes the axial bunching mechanism of klystrons in conjunction with the energy extraction mechanism of cyclotron resonance masers. A simple analytic model is used ... -
Electromagnetic properties of open and closed overmoded slow-wave resonators for interaction with relativistic electron beams
(©1994 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE., 1994-10)Specific slow wave structures are needed in order to produce coherent Cherenkov radiation in overmoded relativistic generators. The electromagnetic characteristics of such slow wave, resonant, finite length structures ... -
Analysis of the electromagnetic waves in an overmoded finite length slow wave structure
(©1995 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE., 1995-04)The electromagnetic fields of the higher order axial resonant modes in a slow wave structure are analyzed and found to have considerably different characteristics from those of the conventional fundamental mode. Here, ... -
Starting energy and current for a large diameter finite length backward wave oscillator operated at the fundamental mode
(©1995 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE., 1995-04)We study the starting conditions for a large diameter (diameter/wavelength = 4.8) finite length backward wave oscillator designed for 24-GHz operation at the fundamental T M o l mode. This geometry is very promising for ... -
Sheet beam emittance measurements by slit-pinhole method
(Elsevier, 1996)A method for measuring sheet electron beam emittance is developed. The effective emittances are obtained through construction of particle distribution in the transverse dimensions using slit- pinhole parameters. Measurement ... -
Design of an efficient, low voltage, third harmonic, large-orbit gyrotron amplifier with a vane-resonator output cavity
(©1996 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE., 1996-06)We present the design of a 100 kW, J-band, third harmonic large-orbit gyrotron amplifier which utilizes the interaction between a 45 kV, 4 A beam and a vane resonator output cavity operating in the “?r”-mode. An efficiency ... -
Design of a high-efficiency low voltage axially modulated cusp-injected second-harmonic x-band gyrotron amplifier
(©1996 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE., 1996-06)We present the theoretical design of a secondharmonic small-orbit gyrotron amplifier which utilizes the interaction between a 35-kV 4-A beam and a TEoll cavity to produce over 70 kW of amplified power at 9.9 GHz in a ... -
A High-power millimeter-wave sheet beam free-electron laser amplifier
(©1996 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE., 1996-06)The results of experiments with a short period (9.6 mm) wiggler sheet electron beam (1.0 mm x 2.0 cm) millimeter-wave free electron laser (FEL) amplifier are presented. This FEL amplifier utilized a strong wiggler field ... -
Beam conditioning for electron energy recovery systems in devices employing axis-encircling beams
(Taylor & Francis, 1988)Depressed collectors are extensively used in linear-beam devices. In spiraling beam devices, the motion of the spent beam needs to be converted into axial motion before it can deliver energy to the retarding axial ... -
Microwave radiation from a low-energy rotating electron beam in an azimuthally periodic magnetic wiggler field
(©1987 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE., 1987-09)The generation of microwave radiation by the interaction of a low-energy rotating electron beam (25 kV, 0.5 A, 5 ps) with an azimuthally periodic magnetic wiggler field has been studied experimentally. Narrow-band ... -
Short-pulse high-power microwave propagation in the atmosphere
(American Institute of Physics, 1988-02-12)The propagation of high-power 00-200 kW/cm2 ) short-burst (3-30 ns) microwave pulses in the atmosphere has been studied experimentally. Microwave power from a large orbit gyrotron operating at 9.6 GHz is focused by a ... -
Propagation of wiggler focused relativistic sheet electron beams
(American Institute of Physics, 1988-02-09)A recent design concept for millimeter-wave free-electron lasers [J. Appl, Phys, 60, 521 ( 1986)] would require the stable propagation of a sheet electron beam through a narrow waveguide channel. Experimental results ...