Computer Simulations of Microwave Generation from Relativistic Electron Beams PDF Download
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Author:
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Category :
Languages : en
Pages : 17
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Book Description
This is the Final Technical Report on work performed under the support of the Air Force Office of Scientific Research on the subject of simulating microwave generation. This report contains the write-ups that we sent for the upcoming book on power vacuum electronics. The first section (Chapter 10) describes the simulation algorithm based on mode expansion technique developed at UCLA while the second section (Chapter 5) gives the real amplification mechanism for the Phigtron.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
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Book Description
This is the Final Technical Report on work performed under the support of the Air Force Office of Scientific Research on the subject of simulating microwave generation. This report contains the write-ups that we sent for the upcoming book on power vacuum electronics. The first section (Chapter 10) describes the simulation algorithm based on mode expansion technique developed at UCLA while the second section (Chapter 5) gives the real amplification mechanism for the Phigtron.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 46
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Book Description
The objective of this work was to carry out basic physics research on the generation of coherent, tunable radiation from relativistic electron beams and exploring means of improving performances. This work covered computer simulations and theoretical studies of radiation generation in free electron microwave devices.
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Category :
Languages : en
Pages : 40
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Book Description
Profile modification by optical guiding in a Raman free electron laser operating at microwave frequencies was studied experimentally. A cyclotron autoresonance maser (CARM) amplifier was designed, built, and tested. This CARM operates at 35 GHz with a power output of 10 MW and an efficiency of three percent. Observations of Field Profile Modifications in a Raman Free Electron Laser Amplifier: We report measurements of the spatial distribution of the RF electric field intensities and phases induced in a free electron laser amplifier operating in the collective (Raman) regime. The studies are carried out at a microwave frequency of about 10 GHz in a FEL using a mildly relativistic electron beam of about 200 keV energy and 1 - 4 A current. The probing of the ponderomotive (space charge) and the electromagnetic waves is accomplished by means of small movable electric dipole antennas inserted into the interaction region. A 35 GHz Cyclotron Autoresonance Maser Amplifier: Studies of a cyclotron autoresonance maser are presented. The measurements are carried out at a frequency of 35 GHz using a mildly relativistic electron beam (1.5 MeV, 260 A) generated by a field emission electron gun followed by an emittance selector that removes the outer, hot electrons. Perpendicular energy is imparted to the electrons by means of a bifilar helical wiggler. Measurements give a small signal gain of 90 dB/m and a saturated power output of 10 MW. The corresponding electronic efficiency is 3%. Computer simulations are also presented.
Author: Miles Hunt Baron
Publisher:
ISBN:
Category : Microwave devices
Languages : en
Pages : 178
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Author:
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ISBN:
Category :
Languages : en
Pages : 3
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Book Description
In two-beam accelerators, the reacceleration of a modulated drive beam can enable high conversion efficiency of electron beam energy to rf energy. However, the stability issues involved with the transport of high current electron beams through rf extraction structures and induction accelerator cells are critical. The author reports on theoretical studies and computer simulations of a two-beam accelerator design using traveling-wave extraction structures. Specific issues addressed include regenerative and cumulative transverse instabilities.
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Category :
Languages : en
Pages :
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Simulation of the generation of a relativistic electron beam in a foil diode configuration and of the subsequent intense microwave generation resulting from the formation of the virtual cathode is presented. The oscillating virtual cathode and the trapped beam electrons between the real and the virtual cathodes were found to generate microwaves. Generation of high-power microwaves with about 10% efficiency might be reasonably expected from such a virtual-cathode configuration.
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Category :
Languages : en
Pages : 24
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Book Description
This report provides a basis for evaluating the current and near- future development of relativistic-electron-beam (REB) technology for the generation of microwave radiation. Magnetrons, gyrotrons, and Raman scattering are examined in some detail and references are cited for several other conversion schemes. The status of repetitively pulsed REB generation is then reviewed and two hypothetical systems are constructed from the conversion schemes and generators that were considered earlier. Finally, some of the advantages (such as high power and compact size) and disadvantages (such as unproven technology) are summarized. (Author).
Author: Wallace M. Manheimer
Publisher:
ISBN:
Category :
Languages : en
Pages : 59
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Book Description
Motivated by the recent results of Friedman and Herndon the authors have investigated theoretically the stability of a waveguide enclosed relativistic electron beam in a rippled magnetic field. The presence of the ripple can couple negative energy beam modes to positive energy waveguide modes to produce instability and thereby generate microwaves. In the experiment the thickness of the beam is small compared to all other relevant lengths. The nonlinear dynamics of an infinitessimally thin sheet beam is analyzed. The system is described by the orbit equations for the particles, Maxwell's equations, a set of nonlinear boundary conditions across the moving surface and a continuity equation for the moving surface. (Author).
Author:
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ISBN:
Category : Power resources
Languages : en
Pages : 294
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Book Description
Author: R.A Cairns
Publisher: CRC Press
ISBN: 1000157180
Category : Mathematics
Languages : en
Pages : 351
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Book Description
Written at the graduate level, Generation and Application of High Power Microwaves discusses the basic physics of the generation of microwave and radiofrequency waves in the megawatt power range and the application of these ideas to a range of devices such as klystrons, gyrotrons, and free electron lasers. The book also contains chapters covering the transmission of the power through waveguides and the problems associated with mode conversion in transmission lines. The main application area covered is the heating and current drive in tokamaks and other devices for research into controlled nuclear fusion. Other applications of high power microwave technology are not neglected, and among those discussed are multiple charged ion and soft x-ray sources, electron spin resonance spectroscopy, advanced materials processing, millimeter wave radar, and supercolliders.
