Browsing by Author "Carmel, Y."
Now showing items 1-20 of 29
-
Absolute instability for enhanced radiation from a high-power plasma filled backward wave oscillator
Minami, K.; Ali, M.; Ogura, K.; Hosokawa, T.; Kazama, H.; Ozawa, T.; Watanabe, T.; Granatstein, V.; Destler, William; Kehs, R.; Carmel, Y.; Lou, W.; Abe, D. (©1990 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., 1990) -
Analysis of the electromagnetic waves in an overmoded finite length slow wave structure
Amin, Rahul; Ogura, K.; Kitamura, H.; Minami, K.; Watanabe, T.; Carmel, Y.; Main, W.; Weaver, J.; Destler, William; Granatstein, V. (©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, ... -
Can plasma microwave devices revitalize and broaden the scientific and technological base of microwave sources?
Carmel, Y.; Antonsen, T. Jr; Levush, B.; Nusinovich, G.; Destler, William; Granatstein, V. (1994-06) -
Demonstration of efficiency enhancement in a high-power backward-wave oscillator by plasma injection
Carmel, Y.; Minami, K.; Kehs, R.; Destler, William; Granatstein, V.; Abe, D.; Lou, W. (American Physical Society, 1989-05-15)An experimental demonstration of a strong enhancement of the interaction efficiency in a high-power relativistic backward-wave oscillator when plasma is injected is presented. Controlled plasma injection enhances the ... -
Demonstration of efficiency enhancement on a high-power backward-wave oscillator by plasma injection
Carmel, Y.; Minami, K.; Kehs, R.; Destler, William; Granatstein, V.; Abe, D.; Lou, W. (American Physical Society, 1989)An experimental demonstration of a strong enhancement of the interaction efficiency in a high-power relativistic backward-wave oscillator when plasma is injected is presented. Controlled plasma injection enhances the ... -
Electromagentic properties of corrugated and smooth waveguides filled with radially inhomogeneous plasma
Shkvarunets, A.; Kobayashi, S.; Weaver, J.; Carmel, Y.; Rodgers, J.; Antonsen, T. Jr; Granatstein, V.; Destler, William (Institute of Electrical and Electronics Engineers, 1996)No abstract found. -
Electromagnetic properties of open and closed overmoded slow-wave resonators for interaction with relativistic electron beams
Main, W.; Carmel, Y.; Ogura, K.; Weaver, J.; Nusinovich, G.; Kobayashi, S.; Tate, J.; Rodgers, J.; Bromborsky, A.; Watanabe, S.; Amin, M.; Minami, K.; Destler, William; Granatstein, V. (©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 ... -
Experimental and numerical results on a millimeter-wave free electron laser amplifier
Granatstein, V.L.; Destler, William; Bidwell, S.W.; Zhang, Z.X.; Antonsen, T.M. Jr.; Levush, B.; Rodgers, J.; Carmel, Y.; Freund, H.P. (Elsveier - Nuclear instruments and methods in physics research, 1993-07)Progress in studies of a millimeter-wave free electron laser amplifier based on a small period planar wiggler and a sheet electron beam is reported. Successful propagation of a 15 A sheet electron beam has been accomplished ... -
Experimental demonstration of an electromagnetically pumped free-electron laser with a cyclotron-harmonic idler
Kehs, R.; Carmel, Y.; Granatstein, V.; Destler, William (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 ... -
Experimental development of a millimeter wave free electron laser
Radack, D.; Bidwell, S.; Antonsen, T. Jr; Carmel, Y.; Destler, William; Granatstein, V.; Latham, P.; Levush, B.; Mayergoyz, I.; Rodgers, J.; Zhang, Z. (SPIE, 1990-12)A 1 MW (cw), millimeter wave FEL (X, « 0.5 mm) is currently under development with an application for heating fusion plasmas. Two salient features of the FEL are the use of a short-period wiggler £w < 10 mm) electromagnet and ... -
Experimental high power plasma-filled backward wave oscillator results
Minami, K.; Lou, W.; Destler, William; Kems, R.; Granatstein, V.; Carmel, Y. (Institute of Electrical and Electronics Engineers, 1988-06) -
Experimental studies of high power plasma filled backward wave oscillators
Carmel, Y.; Lou, W.R.; Destler, William; Granatstein, V.L.; Rodgers, J.; Kehs, R.A.; Minami, K. (IEEE, 1990-05-21)Summary form only given, as follows. It has previously been demonstrated that a plasma-loaded backward wave oscillator (BWO) powered by a relativistic electron beam can generate hundreds of megawatts of microwave radiation ... -
Experimental studies of high power plasma filled backward wave oscillators
Carmel, Y.; Lou, W.; Destler, William; Granatstein, V.; Rodgers, J.; Kehs, R.; Minami, K. (1990-05-22) -
From linearity towards chaos: Basic studies of relativistic backward-wave oscillators
Carmel, Y.; Lou, W.R.; Rodgers, J.; Guo, H.; Destler, William; Granatstein, V.L.; Levush, B.; Antonsen, T. Jr.; Bromborsky, A. (American Physical Society, 1992-09-14)Recent experimental studies have revealed for the first time some basic features of pulsed. relativistic (300-600 keY) backward-wave oscillators such as starting current, axial mode locking, and multifrequency operation. ... -
High power plasma filled backward wave oscillators
Destler, William; Minami, K.; Lou, W.; Carmel, Y.; Granatstein, V.; Kehs, R. (SPIE, 1988-01)Relativistic backward wave oscillators (BWOs) have proven to be relatively efficient, high-power microwave sources in the centimeter wavelength range. Recent Soviet results have indicated that the use of a background ... -
A High-average power tapered FEL amplifier at submillimeter frequencies using sheet electron beams and short-period wigglers
Bidwell, S.; Radack, D.; Antonsen, T.; Booske, J.; Carmel, Y.; Destler, William; Granatstein, V.; Levush, B.; Lathem, P.; Zhang, Z. (Elsevier, 1990-09-17)A high-average-power FEL amplifier operating at submillimeter frequencies is under development at the University of Maryland. Program goals are to produce a CW, ~ 1 MW, FEL amplifier source at frequencies between 280 GHz ... -
High-average-power CW FELs for application to plasma heating designs and experiments
Booske, J.; Granatstein, V.; Radack, D.; Antonsen, T.; Bidwell, S.; Carmel, Y.; Destler, William; Latham, O.; Levush, B.; Mayergoyz, I.; Zhang, Z. (IEEE, 1990)A short-period-wiggler (period - 1 cm), sheet-beam FEL has been proposed as a low-cost source of high-average-power (1 MW) millimeter-wave radiation for plasma heating and space-based radar applications. Recent calculations ... -
Investigations of the electromagnetic properties of finite length x-band slow-wave structures
Main, W.; Carmel, Y.; Ogura, K.; Weaver, J.; Tate, J.; Watanabe, S.; Nusinovitch, G.; Destler, William; Granatstein, V. (1993-06-07) -
New modes in a plasma with periodic boundaries: the origin of the dense spectrum
Lou, W.; Carmel, Y.; Antonsen, T.; Destler, William; Granatstein, V. (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 ... -
Novel method for determining the elctromagnetic dispersion relation of periodic slow wave structures
Carmel, Y.; Guo, H.; Lou, R.; Abe, D.; Granatstein, V.; Destler, William (©1990 American Institute of Physics, 1990-09-24)A novel method for calculating the dispersion relation of electromagnetic modes in an arbitrary periodic slow wave structure is reported. In this method it is sufficient to know the frequencies corresponding to three special ...