# IEEE Transactions on Plasma Science

## Volume 36 Issue 3  Part 1 • June 2008

This issue contains several parts.Go to:  Part 2

## Filter Results

Displaying Results 1 - 25 of 27

Publication Year: 2008, Page(s):C1 - 565
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• ### IEEE Transactions on Plasma Science publication information

Publication Year: 2008, Page(s): C2
| PDF (39 KB)
• ### The Twelfth Special Issue on High-Power Microwave Generation

Publication Year: 2008, Page(s):566 - 568
Cited by:  Papers (1)
| PDF (194 KB) | HTML
• ### Space Applications of High-Power Microwaves

Publication Year: 2008, Page(s):569 - 581
Cited by:  Papers (40)
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Schemes have been suggested for transferring energy from Earth-to-space, space-to-Earth, and space-to-space using high-power microwave (HPM) beams. All use power beaming. Microwave beams have been studied for propelling spacecraft for launch to orbit, orbit raising, launch from orbit into interplanetary and interstellar space, and deployment of large space structures. The microwave thermal rocket,... View full abstract»

• ### Self-Consistent Electromagnetic–Thermal Model for Calculating the Temperature of a Ceramic Cylinder Irradiated by a High-Power Millimeter-Wave Beam

Publication Year: 2008, Page(s):582 - 590
Cited by:  Papers (1)
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The high-power millimeter-wave beams that can be generated by CW gyrotrons represent a promising energy source for rapid high-temperature processing of materials. A program is under way at the Naval Research Laboratory to investigate the heating of ceramic tubes and cylinders using an 83-GHz beam for joining and sintering applications. In this paper, we discuss the scattering and absorption of mic... View full abstract»

• ### Design of a Subterahertz, Third-Harmonic, Continuous-Wave Gyrotron

Publication Year: 2008, Page(s):591 - 596
Cited by:  Papers (19)
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The design of a 400-GHz gyrotron operating at the third cyclotron harmonic is presented. The gyrotron is designed to operate at the TE6!4-mode, which allows one to produce about 1 kW of output power with the density of ohmic losses acceptable for continuous operation. The dependence of performance characteristics on various gyrotron parameters (beam voltage, current, pitch-ratio, and velocity spre... View full abstract»

• ### Observation of Mode Competition in an 11.4-GHz Magnicon Amplifier

Publication Year: 2008, Page(s):597 - 605
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This paper describes the observation of pulse shortening in an 11.4-GHz magnicon amplifier due to competition with a parasitic gyrotron mode. This effect was observed following the installation of a new electron beam collector. The parasitic mode occurred only at high operating powers, when the beam transverse momentum was high, and the growth of the parasitic mode caused the power in the output p... View full abstract»

• ### MAGY Simulations of Mode Interaction in a Coaxial Gyrotron

Publication Year: 2008, Page(s):606 - 619
Cited by:  Papers (5)
| | PDF (1610 KB) | HTML

Mode interactions in coaxial gyrotrons are studied numerically using the Maryland gyrotron code (MAGY), which has recently been modified to treat coaxial structures. Simulations are focused on the study of the FZK 170 GHz coaxial gyrotron. This device is being considered for electron cyclotron plasma heating in International Thermonuclear Experimental Reactor; however, current performance is below... View full abstract»

• ### Improved Magnetron Injection Guns for Gyrotrons

Publication Year: 2008, Page(s):620 - 630
Cited by:  Papers (7)
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Recent gyrotron operations indicate that nonuniform cathode emission is prevalent in many, if not most, magnetron injection guns. A nonuniform emission can result in degradation of the RF performance and increase heating in the collector. This paper describes research to improve cathode emission by addressing temperature uniformity and work function issues. A new cathode design is proposed, and a ... View full abstract»

• ### RF Behavior of a 200-kW CW Gyrotron

Publication Year: 2008, Page(s):631 - 636
Cited by:  Papers (11)
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The RF behavior of a 42-GHz 200-kW continuous-wave (CW) gyrotron for plasma heating in a small experimental tokamak is presented in this paper. The operating mode, as a matter of technical convenience, is the mode, as is required by the end user. Design constraints are carefully investigated, and starting currents are computed. Cold-cavity and self-consistent calculations are carried out; power an... View full abstract»

• ### Self-Fields in a Planar Orotron

Publication Year: 2008, Page(s):637 - 646
Cited by:  Papers (1)
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The goal of producing terahertz radiation from miniature electron beam devices has refocused interest in orotrons. The efficiency of these devices improves with increasing current density. However, with increasing current density, self-fields become more important. In this paper, the theory of self-fields in a planar orotron is developed. We find that the parameters of the grating, which provides ... View full abstract»

• ### Controlled Amplification in a TWT Using the Guide Magnetic Field

Publication Year: 2008, Page(s):647 - 654
Cited by:  Papers (3)
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The interaction of the fast cyclotron wave of a linear electron beam guided by a magnetic field with a counter- propagating electromagnetic wave leads to the appearance of a stop-band over a wide range of the magnetic field near its resonance. Suppression of generation in backward wave oscillators and the resonant-cyclotron method of mode selection are based on this effect, termed "cyclotron absor... View full abstract»

• ### Repetitive Production of Nanosecond Gigawatt Microwave Pulses

Publication Year: 2008, Page(s):655 - 660
Cited by:  Papers (15)
| | PDF (611 KB) | HTML

This paper presents the results of the theoretical and experimental studies of an efficient and stably operating microwave source with a nanosecond high-current electron beam in an extended backward-wave-oscillator-type slow-wave structure. The possibilities for stabilization of the RF field phase and for minimization of the pulse-to-pulse peak power spread have been demonstrated. Possible mechani... View full abstract»

• ### Measurement of Parameters of X-Band High-Power Microwave Superradiative Pulses

Publication Year: 2008, Page(s):661 - 664
Cited by:  Papers (14)
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This paper describes the waveguide antenna, the detector based on the thermionic microwave diode, and the alcohol-filled calorimeter developed at the Institute of High Current Electronics. The techniques were used to measure parameters of X-band microwave pulses with a peak power of approximately 1 GW and a pulse length from 0.7 to 1 ns. The error of the peak power measurement was about 15%. View full abstract»

• ### Design of an Electron Optics System for a $W$-Band Sheet Beam Klystron

Publication Year: 2008, Page(s):665 - 669
Cited by:  Papers (17)
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The design of an electron optics system for a W-band sheet beam klystron was described. An elliptically cylindrical electron gun and wiggler focusing structure were adopted to produce and guide a 80-kV 4-A sheet beam with an elliptical cross section of 10 times 0.4 mm. The wiggler focusing principle was reviewed and a practical structure was presented. MAFIA was used to simulate the structure. The... View full abstract»

• ### Parallel Simulation of Independent Beam-Tunnels in Multiple-Beam Klystrons Using TESLA

Publication Year: 2008, Page(s):670 - 681
Cited by:  Papers (23)
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We present an extension of the klystron simulation code TESLA to model multiple-beam klystrons (MBKs) in which interaction parameters may vary significantly from beam-tunnel to beam-tunnel. In earlier work, the single-beam code was applied to model the MBK by assuming that all electron beams and beam-tunnels were identical and all electron beams interacted identically with the fields of the resona... View full abstract»

• ### Simulation Studies of a Relativistic Klystron With Strong Input Power

Publication Year: 2008, Page(s):682 - 687
Cited by:  Papers (3)
| | PDF (623 KB) | HTML

As one of the potential high-power microwave devices on the level of gigawatts, relativistic klystron amplifier (RKA) can be used for power combination to further improve the radiation microwave power. Because of self-excited oscillation of the intense relativistic electron beam, the frequency and phase characteristics of general relativistic klystron devices are independent with the driven microw... View full abstract»

• ### Experimental Studies of Anode and Cathode Materials in a Repetitive Driven Axial Vircator

Publication Year: 2008, Page(s):688 - 693
Cited by:  Papers (22)
| | PDF (761 KB) | HTML

Repetitive use of a high-power-microwave radiation source implies strong erosion on cathode and anode materials. Electrode-material endurance has been studied in a series of experiments with an axial virtual cathode oscillator powered by a compact Marx generator. The Marx generator is operated in a 10-Hz repetitive mode with a burst of ten pulses. Velvet and graphite was used as electron-emitting ... View full abstract»

• ### Secondary Virtual-Cathode Formation in a Low-Voltage Vircator: PIC Simulations

Publication Year: 2008, Page(s):694 - 700
Cited by:  Papers (12)
| | PDF (308 KB) | HTML

We have performed 2-D relativistic electromagnetic axisymmetric particle-in-cell simulations for an axially extracted vircator. During periods of significant microwave emission, we observe the formation of a secondary smaller virtual cathode (VC) at some distance from the main VC. For a given vircator geometry, this appears only during low-voltage operation. The electron density in this secondary ... View full abstract»

• ### Ion Noise in the Plasma-Assisted Slow-Wave Oscillator

Publication Year: 2008, Page(s):701 - 709
Cited by:  Papers (1)
| | PDF (328 KB) | HTML

The theory describing the effect of ion oscillations on the spectrum of outgoing microwave radiation in plasma-assisted slow-wave oscillators (pasotrons) is developed. It is shown that the most important are the variations of ion density in the potential well formed by electron beam in the space between the plasma gun and an aperture installed at the entrance to the interaction space. These fluctu... View full abstract»

• ### Magnetic Priming at the Cathode of a Relativistic Magnetron

Publication Year: 2008, Page(s):710 - 717
Cited by:  Papers (24)  |  Patents (1)
| | PDF (819 KB) | HTML

Experiments have been performed in testing magnetic priming at the cathode of a relativistic magnetron to study the effects on high-power microwave performance. Magnetic priming consists of N/2 azimuthal magnetic perturbations applied to an N-cavity magnetron for rapid generation of the desired number of electron spokes for the pi-mode. Magnetic perturbations were imposed by utilizing three high-p... View full abstract»

• ### Review of Cold Cathode Research at the Air Force Research Laboratory

Publication Year: 2008, Page(s):718 - 728
Cited by:  Papers (62)
| | PDF (1141 KB) | HTML

Over the last decade, the Air Force Research Laboratory, Directed Energy Directorate (AFRL/DE) has engaged in a high current density field emission cathode research program. This program explored the aspects of cathode materials as well as the details of cathode geometries and emission physics. This paper summarizes the results of this ongoing research effort to date. We review the history and mot... View full abstract»

• ### Off-Axis Space-Charge Limit for a Bunched Electron Beam in a Coaxial Conducting Structure

Publication Year: 2008, Page(s):729 - 734
Cited by:  Papers (6)
| | PDF (237 KB) | HTML

We derive a space-charge limit for a circularly symmetric bunched electron beam that has its center-of-mass slightly offset from the axis of a circularly symmetric coaxial conducting structure. The limit is a necessary condition for beam stability resulting from the following two forces acting on the center-of-mass of the electron bunch: (1) the radial deflecting force due to the induced surface c... View full abstract»

Publication Year: 2008, Page(s): 735
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Publication Year: 2008, Page(s): 736
| PDF (291 KB)

## Aims & Scope

IEEE Transactions on Plasma Sciences focuses on plasma science and engineering, including: magnetofluid dynamics and thermionics; plasma dynamics; gaseous electronics and arc technology.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief
Steven J. Gitomer, Ph.D.
Senior Scientist, US Civilian Research & Development Foundation
Guest Scientist, Los Alamos National Laboratory
1428 Miracerros Loop South
Santa Fe, NM  87505  87505  USA
tps-editor@ieee.org
Phone:505-988-5751
Fax:505-988-5751 (call first)