Experimental investigation of current free double layers in helicon plasmas
The paper presents investigations of current free double layer (CFDL) that forms in helicon plasmas. In contrast to the other work reporting on the same subject, in the present investigations the double layer (DL) forms in a mirror-like magnetic field topology. The RF compensated Langmuir probe meas...
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| Published in | Physics of plasmas Vol. 21; no. 2; pp. 23504 - 23510 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
Melville
American Institute of Physics
01.02.2014
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1070-664X 1089-7674 |
| DOI | 10.1063/1.4864651 |
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| Abstract | The paper presents investigations of current free double layer (CFDL) that forms in helicon plasmas. In contrast to the other work reporting on the same subject, in the present investigations the double layer (DL) forms in a mirror-like magnetic field topology. The RF compensated Langmuir probe measurements show multiple DLs, which are in connection with, the abrupt fall of densities along with potential drop of about 24 V and 18 V. The DLs strengths
e
Δ
V
p
k
T
e
are about 9.5 and 6, and the corresponding widths are about 6 and 5 D lengths. The potential drop is nearly equal to the thermal anisotropies between the two plasma regions forming the DL, which is present in the plateau region of mirror, unlike the earlier studies on the DL formation in the region of strong gradients in the magnetic field. Also, it presents a qualitative discussion on the mechanism of DL formation. |
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| AbstractList | The paper presents investigations of current free double layer (CFDL) that forms in helicon plasmas. In contrast to the other work reporting on the same subject, in the present investigations the double layer (DL) forms in a mirror-like magnetic field topology. The RF compensated Langmuir probe measurements show multiple DLs, which are in connection with, the abrupt fall of densities along with potential drop of about 24 V and 18 V. The DLs strengths e ΔVpk Te are about 9.5 and 6, and the corresponding widths are about 6 and 5 D lengths. The potential drop is nearly equal to the thermal anisotropies between the two plasma regions forming the DL, which is present in the plateau region of mirror, unlike the earlier studies on the DL formation in the region of strong gradients in the magnetic field. Also, it presents a qualitative discussion on the mechanism of DL formation. The paper presents investigations of current free double layer (CFDL) that forms in helicon plasmas. In contrast to the other work reporting on the same subject, in the present investigations the double layer (DL) forms in a mirror-like magnetic field topology. The RF compensated Langmuir probe measurements show multiple DLs, which are in connection with, the abrupt fall of densities along with potential drop of about 24 V and 18 V. The DLs strengths e Δ V p k T e are about 9.5 and 6, and the corresponding widths are about 6 and 5 D lengths. The potential drop is nearly equal to the thermal anisotropies between the two plasma regions forming the DL, which is present in the plateau region of mirror, unlike the earlier studies on the DL formation in the region of strong gradients in the magnetic field. Also, it presents a qualitative discussion on the mechanism of DL formation. The paper presents investigations of current free double layer (CFDL) that forms in helicon plasmas. In contrast to the other work reporting on the same subject, in the present investigations the double layer (DL) forms in a mirror-like magnetic field topology. The RF compensated Langmuir probe measurements show multiple DLs, which are in connection with, the abrupt fall of densities along with potential drop of about 24 V and 18 V. The DLs strengths (e ΔV{sub p})/(k T{sub e}) are about 9.5 and 6, and the corresponding widths are about 6 and 5 D lengths. The potential drop is nearly equal to the thermal anisotropies between the two plasma regions forming the DL, which is present in the plateau region of mirror, unlike the earlier studies on the DL formation in the region of strong gradients in the magnetic field. Also, it presents a qualitative discussion on the mechanism of DL formation. |
| Author | Sahu, B. B. Ganguli, A. Tarey, R. D. |
| Author_xml | – sequence: 1 givenname: B. B. surname: Sahu fullname: Sahu, B. B. organization: Department of Applied Sciences and Humanities, Dronacharya College of Engineering – sequence: 2 givenname: R. D. surname: Tarey fullname: Tarey, R. D. organization: Department of Physics, Indian Institute of Technology – sequence: 3 givenname: A. surname: Ganguli fullname: Ganguli, A. organization: Centre for Energy Studies, Indian Institute of Technology |
| BackLink | https://www.osti.gov/biblio/22252105$$D View this record in Osti.gov |
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| Cites_doi | 10.1063/1.3664321 10.1088/0963-0252/19/1/015004 10.1063/1.864294 10.1063/1.2803763 10.1063/1.2426881 10.1103/PhysRev.33.954 10.1103/PhysRevLett.97.045003 10.1063/1.2179393 10.1063/1.2965497 10.1063/1.2927478 10.1063/1.859847 10.1088/0963-0252/17/2/025003 10.1063/1.1652058 10.1063/1.1563260 10.1063/1.4739779 10.1063/1.3002396 10.1063/1.2424429 10.1063/1.1693704 10.1063/1.1557319 10.1016/0370-1573(89)90109-9 10.1109/TPS.2006.875846 10.1063/1.1568342 10.1063/1.2814877 10.1088/0963-0252/20/1/015021 10.1088/0963-0252/17/1/015003 10.1063/1.3276773 10.1103/PhysRevLett.95.025004 10.1063/1.4789900 10.1103/PhysRevLett.65.175 10.1016/0032-0633(73)90093-7 10.1103/PhysRevLett.80.2602 10.1088/0963-0252/19/3/034009 10.1063/1.4817263 10.1063/1.4789455 10.1063/1.862176 10.1088/0963-0252/16/4/R01 10.1103/PhysRevLett.102.035004 |
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| SubjectTerms | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY LANGMUIR PROBE MAGNETIC FIELDS PLASMA PLASMA DENSITY Plasma physics Plasmas (physics) POTENTIALS Topology Voltage drop |
| Title | Experimental investigation of current free double layers in helicon plasmas |
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