Please wait, while we are loading the content...
Please wait, while we are loading the content...
Content Provider | IEEE Xplore Digital Library |
---|---|
Author | Schoenbach, K.H. Moselhy, M. Takano, N. Mohamed, A. Bentley, R. |
Copyright Year | 2004 |
Description | Author affiliation: Center for Bioelectr., Old Dominion Univ., Norfolk, VA, USA (Schoenbach, K.H.; Moselhy, M.; Takano, N.; Mohamed, A.; Bentley, R.) |
Abstract | Summary form only given. Direct current glow discharges between a planar cathode and a ring-shaped anode with a diameter on the order of one millimeter, separated by a gap of 100 to 250 /spl mu/m, was studied in xenon and argon in a pressure range from 75 to 760 Torr. The thickness of the "cathode boundary layer" (CBL) plasma, in the 100 /spl mu/m range, and a discharge sustaining voltage of approximately 200 V, indicates that the discharge is restricted to the cathode fall and the negative glow, with the negative glow serving as virtual anode. The CBL plasma was found to be an efficient source of excimer radiation. In xenon, at 172 nm, the radiant excimer emittance reaches a value of 4 W/cm/sup 2/ for atmospheric pressure operation; in argon, at 128 nm, the maximum measured value was 1.6 W/cm/sup 2/ at 600 Torr. Efficiencies range from 2.5% for argon to 5% for xenon. When the discharge current is reduced below a critical value, the discharge in xenon, but not in argon, changes from an abnormal glow into a mode showing self-organization of the plasma. The plasma patterns, regularly arranged filaments that are most pronounced at lower pressures (100 Torr), show discrete changes when the current is decreased by fractions of mA. This self-organization of the plasma requires the presence of a second stable branch in addition to the abnormal cathode fall in the voltage-current density characteristic of the "cathode boundary layer" (CBL) discharges. A model of the cathode fall by von Engel and Steenbeck, which was modified to take thermal conduction through the 500 /spl mu/m thick cathode as a loss process into account, in addition to radiation, indicates the presence of second stable mode of the glow discharge beyond the abnormal glow mode. The effect of the cathode surface structure on the development of regularly arranged plasma filaments has been demonstrated by modifying the cathode surface. The positive slope of the current-voltage characteristics of the CBL discharges over a wide range of currents (including that, where self-organization is observed) indicates the possibility of generating structured, large-area plasma layers, including flat excimer sources. |
Sponsorship | Plasma Sci. and Applications Committee of the IEEE Nuclear and Plasma Sci. Soc |
File Size | 74835 |
File Format | |
ISBN | 0780383346 |
ISSN | 07309244 |
DOI | 10.1109/PLASMA.2004.1340024 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 2004-07-01 |
Publisher Place | USA |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Cathodes Xenon Argon Plasma sources Plasma stability Plasma properties Fault location Glow discharges Anodes Voltage |
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...
|