Please wait, while we are loading the content...
| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Smithe, D.N. Goplen, B. Kodis, M.A. Vanderplaats, N.R. |
| Copyright Year | 1995 |
| Description | Author affiliation: Mission Res. Corp., Newington, VA, USA (Smithe, D.N.; Goplen, B.) |
| Abstract | The twystrode employs a helix slow-wave structure together with a pre-bunched beam to generate microwaves. Because the beam can be tightly bunched as it enters the helix region, the conversion of energy to microwaves does not occur in the same manner as for conventional helix TWT's, since in particular, the linear growth regime is completely absent. MRCs electromagnetic PIC simulation code, MAGIC, has been used to model the twystrode device with several new state-of-the-art techniques. Most important is the Helix Polarizer Model, which permits 2-D simulation of the helical element, based on a sheath helix approximation. Other new simulation techniques include enhanced boundary modeling, improvements to better model three-dimensional structures such as dielectric supports and vanes, and new diagnostics which reveal the evolution of efficiency, harmonic content, backward- and forward-wave components, and beam quality throughout the twystrode. Additionally, an on-line collector-analysis capability provides an estimate of the recoverable energy in the spent beam and suggests optimum collector stage voltages. MAGIC has previously demonstrated good agreement with experimental measurements, and has been instrumental in the design of EGA-IIC, a high-efficiency twystrode experiment incorporating a highly tapered helix (pitch ratio of 3-to-1). Such a device is predicted to permit the slow-wave interaction of the pre-bunched electron beam to proceed into the 50% efficiency range. This paper will present simulation results for the 487 MHz EGA-IIB (an operating experiment using an untapered helix), EGA-IIC (an experiment underway using a tapered helix), and a hypothetical 10-GHz FEA-driven device (motivated by Microwave Power Module (MPM) requirements). |
| File Size | 120120 |
| File Format | |
| ISBN | 0780326695 |
| ISSN | 07309244 |
| DOI | 10.1109/PLASMA.1995.532820 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1995-06-05 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Circuit optimization Microwave devices Microwave generation Electromagnetic devices Electromagnetic modeling Electromagnetic wave polarization Dielectrics Blades Voltage Instruments |
| Content Type | Text |
| Resource Type | Article |
| Subject | Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
| 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 |
|
Loading...
|