NDLI: Miniature Plasma Cathode for High-Power Terahertz Orotron and Clinotron Oscillators

Content Provider	IEEE Xplore Digital Library
Author	Rodgers, J. Ran Chang Granatstein, V. Antonsen, T. Nusinovich, G. Carmel, Y.
Copyright Year	2005
Description	Author affiliation: Inst. for Res. in Electron. & Appl. Phys., Maryland Univ., College Park, MD (Rodgers, J.; Ran Chang; Granatstein, V.; Antonsen, T.; Nusinovich, G.; Carmel, Y.)
Abstract	Summary form only given. The development of compact terahertz sources capable of output powers and efficiencies greater than 100 mW and 5%, respectively, will require electron beams of high current density (>50 $A/cm^{2})$ and very small dimensions (~100 micron-scale). Generating such dense beams using thermionic emitters necessitates compressing the beam by about a factor of 10 which may negatively impact beam quality. Consequently, alignment and heat load on the interaction circuit from beam interception may be problematic. At modest current densities, the beam must be located very close to the interaction structure in order to achieve good beam-wave coupling and high efficiency. We propose development of miniature plasma cathodes capable of generating >100 $A/cm^{2}$ for pulsed Cerenkov and Smith-Purcell oscillators operating at terahertz frequencies. The advantage of this approach is that the beam could be located farther from the interaction circuit and still self-excite the oscillations. In these structures, the current density, $j_{st},$ required to start oscillation is given approximately by $j_{st}(A/cm^{2})$ = $2middot10^{4}(delta_{s}/H)(1/(L_{int}$ 2 $}(cm)))(1+3beta_{0})V_{b}(kV)$ where deltas is the skin depth, H is the height of the beam above the structure, $L_{int}$ is the interaction length, $beta_{0}$ is the Lorentz factor of the electrons, and $V_{b}$ is the accelerating voltage applied to the beam. As an example, a copper circuit operated at 850 GHz and excited by a beam with current density of 100 $A/cm^{2}$ would drive a 5 mm-long structure at 2.5 times the start current. The design and initial test results on a miniature plasma gun with pulsed control grid will be presented. A 250 mA pencil beam with a diameter of 200 microns has been achieved, corresponding to a current density of 800 $A/cm^{2}.$ Measurements of the stability of the beam current will be presented, and fluctuations due to ion oscillations in the grid extraction region will be discussed
Sponsorship	Plasma Sci. Appl. Comm. IEEE Nucl. Plasma Sci. Soc.
Starting Page	101
Ending Page	101
File Size	816729
Page Count	1
File Format	PDF
ISBN	0780393007
ISSN	07309244
DOI	10.1109/PLASMA.2005.359048
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cathodes Oscillators Current density Plasma density Circuits Electron beams Particle beams Plasma measurements Plasma sources Power generation
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Miniature plasma cathode for high-power terahertz sources

Ribbon Beam Electron Gun Based on Discharge with Extended Hollow Cathode

Plasma Emission Sources for High-Current Electron Beam Generation

Plasma focused electron beam for the pasotron

Study of the hollow cathode plasma electron-gun

High-current carbon-epoxy capillary cathode

Plasma cathode electron sources and their applications

Miniature hollow cathode discharges

Measurement of an electron beam extracted from the plasma edge cathode

Miniature Plasma Cathode for High-Power Terahertz Orotron and Clinotron Oscillators

Similar Documents

Miniature plasma cathode for high-power terahertz sources

Ribbon Beam Electron Gun Based on Discharge with Extended Hollow Cathode

Plasma Emission Sources for High-Current Electron Beam Generation

Plasma focused electron beam for the pasotron

Study of the hollow cathode plasma electron-gun

High-current carbon-epoxy capillary cathode

Plasma cathode electron sources and their applications

Miniature hollow cathode discharges

Measurement of an electron beam extracted from the plasma edge cathode

Miniature Plasma Cathode for High-Power Terahertz Orotron and Clinotron Oscillators