Modelling of the positive column of a medium-pressure Cs–Xe dc discharge affected by a millimetre wave pulse.
Saved in:
| Title: | Modelling of the positive column of a medium-pressure Cs–Xe dc discharge affected by a millimetre wave pulse. |
|---|---|
| Authors: | Gitlin, M S1 gitlin@appl.sci-nnov.ru, Epstein, I L2, Lebedev, Yu A2 lebedev@ips.ac.ru |
| Source: | Journal of Physics D: Applied Physics. 10/16/2013, Vol. 46 Issue 41, p415208-415218. 11p. |
| Subjects: | Cesium, Xenon, Electron density, Plasma gases, Positive columns (Electric discharges) |
| Abstract: | A time-dependent zero-dimensional kinetic model of the positive column (PC) of a medium-pressure Cs–Xe dc discharge was used to gain a better insight into the physical basics of plasma techniques for imaging and control of millimetre wave (MMW) beams. The model allowed one to study the effect of MMWs on the kinetic and electrical characteristics of the spatially homogeneous PC of a Cs–Xe dc discharge. We computed the PC plasma parameters for 30 Torr and 45 Torr xenon and discharge current densities of about 0.1 A cm−2. First, the dependences of the PC parameters on caesium density were calculated in the case of no MMWs incident on the PC plasma. Then, the temporal evolution of the parameters of the PC plasma affected by a long watt-scale Ka-band MMW pulse was modelled for caesium densities of about 3 × 1012 and 5 × 1012 cm−3. The calculations showed that the electron temperature in the PC plasma attained quasisteady-state values for about 1 µs after the beginning of the MMW pulse. The electron temperature rises by 0.2–0.3 eV as the MMW intensity increases from 0 to 1 W cm−2. The rise time of the electron density decreased with an increase in the MMW intensity W from about 1 ms for W = 0.15 W cm−2 to tens of microseconds for W > 1.5 W cm−2. The steady-state values of the electron density increased in proportion to W, if W < 0.5 W cm−2. They were approximately constant for 0.5 < W < 2 W cm−2 due to the nearly full ionization of caesium atoms in the PC plasma. Efficient xenon excitation and ionization for W > 3 W cm−2 could be a cause of the microwave breakdown of the homogeneous PC plasma. The results of the modelling are in good agreement with the published experimental data. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Physics D: Applied Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
|---|---|
| Header | DbId: egs DbLabel: Engineering Source An: 94297838 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
| IllustrationInfo | |
| Items | – Name: Title Label: Title Group: Ti Data: Modelling of the positive column of a medium-pressure Cs–Xe dc discharge affected by a millimetre wave pulse. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Gitlin%2C+M+S%22">Gitlin, M S</searchLink><relatesTo>1</relatesTo><i> gitlin@appl.sci-nnov.ru</i><br /><searchLink fieldCode="AR" term="%22Epstein%2C+I+L%22">Epstein, I L</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Lebedev%2C+Yu+A%22">Lebedev, Yu A</searchLink><relatesTo>2</relatesTo><i> lebedev@ips.ac.ru</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Physics+D%3A+Applied+Physics%22">Journal of Physics D: Applied Physics</searchLink>. 10/16/2013, Vol. 46 Issue 41, p415208-415218. 11p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Cesium%22">Cesium</searchLink><br /><searchLink fieldCode="DE" term="%22Xenon%22">Xenon</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+density%22">Electron density</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+gases%22">Plasma gases</searchLink><br /><searchLink fieldCode="DE" term="%22Positive+columns+%28Electric+discharges%29%22">Positive columns (Electric discharges)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: A time-dependent zero-dimensional kinetic model of the positive column (PC) of a medium-pressure Cs–Xe dc discharge was used to gain a better insight into the physical basics of plasma techniques for imaging and control of millimetre wave (MMW) beams. The model allowed one to study the effect of MMWs on the kinetic and electrical characteristics of the spatially homogeneous PC of a Cs–Xe dc discharge. We computed the PC plasma parameters for 30 Torr and 45 Torr xenon and discharge current densities of about 0.1 A cm−2. First, the dependences of the PC parameters on caesium density were calculated in the case of no MMWs incident on the PC plasma. Then, the temporal evolution of the parameters of the PC plasma affected by a long watt-scale Ka-band MMW pulse was modelled for caesium densities of about 3 × 1012 and 5 × 1012 cm−3. The calculations showed that the electron temperature in the PC plasma attained quasisteady-state values for about 1 µs after the beginning of the MMW pulse. The electron temperature rises by 0.2–0.3 eV as the MMW intensity increases from 0 to 1 W cm−2. The rise time of the electron density decreased with an increase in the MMW intensity W from about 1 ms for W = 0.15 W cm−2 to tens of microseconds for W > 1.5 W cm−2. The steady-state values of the electron density increased in proportion to W, if W < 0.5 W cm−2. They were approximately constant for 0.5 < W < 2 W cm−2 due to the nearly full ionization of caesium atoms in the PC plasma. Efficient xenon excitation and ionization for W > 3 W cm−2 could be a cause of the microwave breakdown of the homogeneous PC plasma. The results of the modelling are in good agreement with the published experimental data. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Physics D: Applied Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=94297838 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1088/0022-3727/46/41/415208 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 415208 Subjects: – SubjectFull: Cesium Type: general – SubjectFull: Xenon Type: general – SubjectFull: Electron density Type: general – SubjectFull: Plasma gases Type: general – SubjectFull: Positive columns (Electric discharges) Type: general Titles: – TitleFull: Modelling of the positive column of a medium-pressure Cs–Xe dc discharge affected by a millimetre wave pulse. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Gitlin, M S – PersonEntity: Name: NameFull: Epstein, I L – PersonEntity: Name: NameFull: Lebedev, Yu A IsPartOfRelationships: – BibEntity: Dates: – D: 16 M: 10 Text: 10/16/2013 Type: published Y: 2013 Identifiers: – Type: issn-print Value: 00223727 Numbering: – Type: volume Value: 46 – Type: issue Value: 41 Titles: – TitleFull: Journal of Physics D: Applied Physics Type: main |
| ResultId | 1 |
