Periodic magnetic focusing of sheet electron beams

J. H. Booske; M. A. Basten; A. H. Kumbasar; T. M. Antonsen; S. W. Bidwell; Y. Carmel; W. W. Destter; V. L. Granatstein; D. J. Radack

doi:10.1063/1.870675

Periodic magnetic focusing of sheet electron beams

J. H. Booske, M. A. Basten, A. H. Kumbasar, T. M. Antonsen, S. W. Bidwell, Y. Carmel, W. W. Destter, V. L. Granatstein, D. J. Radack

Research output: Contribution to journal › Article › peer-review

79 Scopus citations

Abstract

Sheet electron beams focused by periodically cusped magnetic (PCM) fields are stable against low-frequency velocity-shear instabilities (such as the diocotron mode). This is in contrast to the more familiar unstable behavior in uniform solenoidal magnetic fields. A period-averaged analytic model shows that a PCM-focused beam is stabilized by ponderomotive forces for short PCM periods. Numerical particle simulations for a semi-infinite sheet beam verify this prediction and also indicate diocotron stability for long PCM periods is less constraining than providing for space-charge confinement and trajectory stability in the PCM focusing system. In this article the issue of beam matching and side focusing for sheet beams of finite width is also discussed. A review of past and present theoretical and experimental investigations of sheet-beam transport is presented.

Original language	English
Pages (from-to)	1714-1720
Number of pages	7
Journal	Physics of Plasmas
Volume	1
Issue number	5
DOIs	https://doi.org/10.1063/1.870675
State	Published - 1 Jan 1994
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics

Access to Document

10.1063/1.870675

Cite this

@article{ed21d5bac4364c86b604067ffe1d8737,

title = "Periodic magnetic focusing of sheet electron beams",

abstract = "Sheet electron beams focused by periodically cusped magnetic (PCM) fields are stable against low-frequency velocity-shear instabilities (such as the diocotron mode). This is in contrast to the more familiar unstable behavior in uniform solenoidal magnetic fields. A period-averaged analytic model shows that a PCM-focused beam is stabilized by ponderomotive forces for short PCM periods. Numerical particle simulations for a semi-infinite sheet beam verify this prediction and also indicate diocotron stability for long PCM periods is less constraining than providing for space-charge confinement and trajectory stability in the PCM focusing system. In this article the issue of beam matching and side focusing for sheet beams of finite width is also discussed. A review of past and present theoretical and experimental investigations of sheet-beam transport is presented.",

author = "Booske, {J. H.} and Basten, {M. A.} and Kumbasar, {A. H.} and Antonsen, {T. M.} and Bidwell, {S. W.} and Y. Carmel and Destter, {W. W.} and Granatstein, {V. L.} and Radack, {D. J.}",

year = "1994",

month = jan,

day = "1",

doi = "10.1063/1.870675",

language = "English",

volume = "1",

pages = "1714--1720",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "5",

}

TY - JOUR

T1 - Periodic magnetic focusing of sheet electron beams

AU - Booske, J. H.

AU - Basten, M. A.

AU - Kumbasar, A. H.

AU - Antonsen, T. M.

AU - Bidwell, S. W.

AU - Carmel, Y.

AU - Destter, W. W.

AU - Granatstein, V. L.

AU - Radack, D. J.

PY - 1994/1/1

Y1 - 1994/1/1

N2 - Sheet electron beams focused by periodically cusped magnetic (PCM) fields are stable against low-frequency velocity-shear instabilities (such as the diocotron mode). This is in contrast to the more familiar unstable behavior in uniform solenoidal magnetic fields. A period-averaged analytic model shows that a PCM-focused beam is stabilized by ponderomotive forces for short PCM periods. Numerical particle simulations for a semi-infinite sheet beam verify this prediction and also indicate diocotron stability for long PCM periods is less constraining than providing for space-charge confinement and trajectory stability in the PCM focusing system. In this article the issue of beam matching and side focusing for sheet beams of finite width is also discussed. A review of past and present theoretical and experimental investigations of sheet-beam transport is presented.

AB - Sheet electron beams focused by periodically cusped magnetic (PCM) fields are stable against low-frequency velocity-shear instabilities (such as the diocotron mode). This is in contrast to the more familiar unstable behavior in uniform solenoidal magnetic fields. A period-averaged analytic model shows that a PCM-focused beam is stabilized by ponderomotive forces for short PCM periods. Numerical particle simulations for a semi-infinite sheet beam verify this prediction and also indicate diocotron stability for long PCM periods is less constraining than providing for space-charge confinement and trajectory stability in the PCM focusing system. In this article the issue of beam matching and side focusing for sheet beams of finite width is also discussed. A review of past and present theoretical and experimental investigations of sheet-beam transport is presented.

UR - http://www.scopus.com/inward/record.url?scp=3342976284&partnerID=8YFLogxK

U2 - 10.1063/1.870675

DO - 10.1063/1.870675

M3 - Article

AN - SCOPUS:3342976284

SN - 1070-664X

VL - 1

SP - 1714

EP - 1720

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

ER -

Periodic magnetic focusing of sheet electron beams

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this