First studies of pure electron plasmas in the Columbia non-neutral Torus

J. W. Berkery; T. S. Pedersen; J. P. Kremer; R. G. Lefrancois; Q. R. Marksteiner; A. H. Boozer; H. E. Mynick; N. Pomphrey; W. Reiersen; F. Dahlgreen; H. Himura; X. Sarasola

doi:10.1063/1.2387909

First studies of pure electron plasmas in the Columbia non-neutral Torus

J. W. Berkery, T. S. Pedersen, J. P. Kremer, R. G. Lefrancois, Q. R. Marksteiner, A. H. Boozer, H. E. Mynick, N. Pomphrey, W. Reiersen, F. Dahlgreen, H. Himura, X. Sarasola

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Scopus citations

Abstract

The first studies of pure electron plasmas confined on magnetic surfaces in the Columbia Non-neutral Torus are overviewed. The electron plasma is created by a thermionic emitter filament and similar filaments mounted on ceramic rods are used as Langmuir and emissive probes. The equilibrium density, temperature and potential profiles are experimentally measured. Numerical calculations of the equilibrium agree well with measurements and also predict a toroidal density variation of a factor of four. The confinement time is found to decrease with increased neutral pressure and emitter bias voltage, and it is presently limited to 20 ms by the insulated emitter and probe rods. A retractable electron emitter and external diagnostics will be used to determine the confinement time in the absence of rods. Ion driven instabilities are observed at high neutral pressure and low magnetic field strength. Further research of these instabilities will be carried out.

Original language	English (US)
Title of host publication	NON-NEUTRAL PLASMA PHYSICS VI
Subtitle of host publication	Workshop on Non-Neutral Plasmas 2006
Pages	62-70
Number of pages	9
DOIs	https://doi.org/10.1063/1.2387909
State	Published - 2006
Externally published	Yes
Event	NON-NEUTRAL PLASMA PHYSICS VI: Workshop on Non-Neutral Plasmas 2006 - Aarhus, Denmark Duration: Jun 25 2006 → Jun 29 2006

Publication series

Name	AIP Conference Proceedings
Volume	862
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	NON-NEUTRAL PLASMA PHYSICS VI: Workshop on Non-Neutral Plasmas 2006
Country/Territory	Denmark
City	Aarhus
Period	6/25/06 → 6/29/06

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

Access to Document

10.1063/1.2387909

Cite this

Berkery, J. W., Pedersen, T. S., Kremer, J. P., Lefrancois, R. G., Marksteiner, Q. R., Boozer, A. H., Mynick, H. E., Pomphrey, N., Reiersen, W., Dahlgreen, F., Himura, H., & Sarasola, X. (2006). First studies of pure electron plasmas in the Columbia non-neutral Torus. In NON-NEUTRAL PLASMA PHYSICS VI: Workshop on Non-Neutral Plasmas 2006 (pp. 62-70). (AIP Conference Proceedings; Vol. 862). https://doi.org/10.1063/1.2387909

@inproceedings{2977b0a42eec48ccb0f9f7cd6388132c,

title = "First studies of pure electron plasmas in the Columbia non-neutral Torus",

abstract = "The first studies of pure electron plasmas confined on magnetic surfaces in the Columbia Non-neutral Torus are overviewed. The electron plasma is created by a thermionic emitter filament and similar filaments mounted on ceramic rods are used as Langmuir and emissive probes. The equilibrium density, temperature and potential profiles are experimentally measured. Numerical calculations of the equilibrium agree well with measurements and also predict a toroidal density variation of a factor of four. The confinement time is found to decrease with increased neutral pressure and emitter bias voltage, and it is presently limited to 20 ms by the insulated emitter and probe rods. A retractable electron emitter and external diagnostics will be used to determine the confinement time in the absence of rods. Ion driven instabilities are observed at high neutral pressure and low magnetic field strength. Further research of these instabilities will be carried out.",

author = "Berkery, \{J. W.\} and Pedersen, \{T. S.\} and Kremer, \{J. P.\} and Lefrancois, \{R. G.\} and Marksteiner, \{Q. R.\} and Boozer, \{A. H.\} and Mynick, \{H. E.\} and N. Pomphrey and W. Reiersen and F. Dahlgreen and H. Himura and X. Sarasola",

year = "2006",

doi = "10.1063/1.2387909",

language = "English (US)",

isbn = "0735403600",

series = "AIP Conference Proceedings",

pages = "62--70",

booktitle = "NON-NEUTRAL PLASMA PHYSICS VI",

note = "NON-NEUTRAL PLASMA PHYSICS VI: Workshop on Non-Neutral Plasmas 2006 ; Conference date: 25-06-2006 Through 29-06-2006",

}

Berkery, JW, Pedersen, TS, Kremer, JP, Lefrancois, RG, Marksteiner, QR, Boozer, AH, Mynick, HE, Pomphrey, N, Reiersen, W, Dahlgreen, F, Himura, H & Sarasola, X 2006, First studies of pure electron plasmas in the Columbia non-neutral Torus. in NON-NEUTRAL PLASMA PHYSICS VI: Workshop on Non-Neutral Plasmas 2006. AIP Conference Proceedings, vol. 862, pp. 62-70, NON-NEUTRAL PLASMA PHYSICS VI: Workshop on Non-Neutral Plasmas 2006, Aarhus, Denmark, 6/25/06. https://doi.org/10.1063/1.2387909

TY - GEN

T1 - First studies of pure electron plasmas in the Columbia non-neutral Torus

AU - Berkery, J. W.

AU - Pedersen, T. S.

AU - Kremer, J. P.

AU - Lefrancois, R. G.

AU - Marksteiner, Q. R.

AU - Boozer, A. H.

AU - Mynick, H. E.

AU - Pomphrey, N.

AU - Reiersen, W.

AU - Dahlgreen, F.

AU - Himura, H.

AU - Sarasola, X.

PY - 2006

Y1 - 2006

N2 - The first studies of pure electron plasmas confined on magnetic surfaces in the Columbia Non-neutral Torus are overviewed. The electron plasma is created by a thermionic emitter filament and similar filaments mounted on ceramic rods are used as Langmuir and emissive probes. The equilibrium density, temperature and potential profiles are experimentally measured. Numerical calculations of the equilibrium agree well with measurements and also predict a toroidal density variation of a factor of four. The confinement time is found to decrease with increased neutral pressure and emitter bias voltage, and it is presently limited to 20 ms by the insulated emitter and probe rods. A retractable electron emitter and external diagnostics will be used to determine the confinement time in the absence of rods. Ion driven instabilities are observed at high neutral pressure and low magnetic field strength. Further research of these instabilities will be carried out.

AB - The first studies of pure electron plasmas confined on magnetic surfaces in the Columbia Non-neutral Torus are overviewed. The electron plasma is created by a thermionic emitter filament and similar filaments mounted on ceramic rods are used as Langmuir and emissive probes. The equilibrium density, temperature and potential profiles are experimentally measured. Numerical calculations of the equilibrium agree well with measurements and also predict a toroidal density variation of a factor of four. The confinement time is found to decrease with increased neutral pressure and emitter bias voltage, and it is presently limited to 20 ms by the insulated emitter and probe rods. A retractable electron emitter and external diagnostics will be used to determine the confinement time in the absence of rods. Ion driven instabilities are observed at high neutral pressure and low magnetic field strength. Further research of these instabilities will be carried out.

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DO - 10.1063/1.2387909

M3 - Conference contribution

AN - SCOPUS:33846531099

SN - 0735403600

SN - 9780735403604

T3 - AIP Conference Proceedings

SP - 62

EP - 70

BT - NON-NEUTRAL PLASMA PHYSICS VI

T2 - NON-NEUTRAL PLASMA PHYSICS VI: Workshop on Non-Neutral Plasmas 2006

Y2 - 25 June 2006 through 29 June 2006

ER -

First studies of pure electron plasmas in the Columbia non-neutral Torus

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