Velocity ratio measurements on a 20-60 kV quasi-optical gyrotron electron beam

Richard P. Fischer; Arne W. Fliflet

doi:10.1109/27.887751

Velocity ratio measurements on a 20-60 kV quasi-optical gyrotron electron beam

Richard P. Fischer, Arne W. Fliflet

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

Abstract

This paper describes experimental measurements of the velocity ratio (α = v_⊥/v_∥) of an annular electron beam for use in a quasi-optical gyrotron (QOG). The electron gun was originally designed for 80-kV 35-A operation, and identical guns have been used in gyrotron experiments by several research groups. A pair of capacitive probes in the drift region are used to characterize the beam over a wide range of voltage (20-60 kV) and current (0-6 A) while varying the magnetic compression and the intermediate-anode voltage. At low-beam voltage, the peak measured values of α are much lower than those calculated from electron trajectory simulations. The capacitive probe results indicate that electrons reflecting from the peak of the magnetic field are important. Increasing the operating voltage of the gun to 50 kV greatly improves the quality of the electron beam.

Original language	English (US)
Pages (from-to)	910-917
Number of pages	8
Journal	IEEE Transactions on Plasma Science
Volume	28
Issue number	3
DOIs	https://doi.org/10.1109/27.887751
State	Published - Jun 2000
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics
Condensed Matter Physics

Online availability

10.1109/27.887751

Library availability

Discover UIUC Full Text

Cite this

@article{7e1fa76636b4441090324a4c1691ff28,

title = "Velocity ratio measurements on a 20-60 kV quasi-optical gyrotron electron beam",

abstract = "This paper describes experimental measurements of the velocity ratio (α = v⊥/v∥) of an annular electron beam for use in a quasi-optical gyrotron (QOG). The electron gun was originally designed for 80-kV 35-A operation, and identical guns have been used in gyrotron experiments by several research groups. A pair of capacitive probes in the drift region are used to characterize the beam over a wide range of voltage (20-60 kV) and current (0-6 A) while varying the magnetic compression and the intermediate-anode voltage. At low-beam voltage, the peak measured values of α are much lower than those calculated from electron trajectory simulations. The capacitive probe results indicate that electrons reflecting from the peak of the magnetic field are important. Increasing the operating voltage of the gun to 50 kV greatly improves the quality of the electron beam.",

author = "Fischer, {Richard P.} and Fliflet, {Arne W.}",

note = "Funding Information: Manuscript received October 1, 1999; revised March 14, 2000. This work was supported by the Office of Naval Research. The authors are with the Plasma Physics Division, U.S. Naval Research Laboratory, Washington, DC 20375 USA. Publisher Item Identifier S 0093-3813(00)06057-4.",

year = "2000",

month = jun,

doi = "10.1109/27.887751",

language = "English (US)",

volume = "28",

pages = "910--917",

journal = "IEEE Transactions on Plasma Science",

issn = "0093-3813",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "3",

}

TY - JOUR

T1 - Velocity ratio measurements on a 20-60 kV quasi-optical gyrotron electron beam

AU - Fischer, Richard P.

AU - Fliflet, Arne W.

N1 - Funding Information: Manuscript received October 1, 1999; revised March 14, 2000. This work was supported by the Office of Naval Research. The authors are with the Plasma Physics Division, U.S. Naval Research Laboratory, Washington, DC 20375 USA. Publisher Item Identifier S 0093-3813(00)06057-4.

PY - 2000/6

Y1 - 2000/6

N2 - This paper describes experimental measurements of the velocity ratio (α = v⊥/v∥) of an annular electron beam for use in a quasi-optical gyrotron (QOG). The electron gun was originally designed for 80-kV 35-A operation, and identical guns have been used in gyrotron experiments by several research groups. A pair of capacitive probes in the drift region are used to characterize the beam over a wide range of voltage (20-60 kV) and current (0-6 A) while varying the magnetic compression and the intermediate-anode voltage. At low-beam voltage, the peak measured values of α are much lower than those calculated from electron trajectory simulations. The capacitive probe results indicate that electrons reflecting from the peak of the magnetic field are important. Increasing the operating voltage of the gun to 50 kV greatly improves the quality of the electron beam.

AB - This paper describes experimental measurements of the velocity ratio (α = v⊥/v∥) of an annular electron beam for use in a quasi-optical gyrotron (QOG). The electron gun was originally designed for 80-kV 35-A operation, and identical guns have been used in gyrotron experiments by several research groups. A pair of capacitive probes in the drift region are used to characterize the beam over a wide range of voltage (20-60 kV) and current (0-6 A) while varying the magnetic compression and the intermediate-anode voltage. At low-beam voltage, the peak measured values of α are much lower than those calculated from electron trajectory simulations. The capacitive probe results indicate that electrons reflecting from the peak of the magnetic field are important. Increasing the operating voltage of the gun to 50 kV greatly improves the quality of the electron beam.

UR - http://www.scopus.com/inward/record.url?scp=0034197599&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034197599&partnerID=8YFLogxK

U2 - 10.1109/27.887751

DO - 10.1109/27.887751

M3 - Article

AN - SCOPUS:0034197599

SN - 0093-3813

VL - 28

SP - 910

EP - 917

JO - IEEE Transactions on Plasma Science

JF - IEEE Transactions on Plasma Science

IS - 3

ER -

Velocity ratio measurements on a 20-60 kV quasi-optical gyrotron electron beam

Abstract

ASJC Scopus subject areas

Online availability

Library availability

Related links

Fingerprint

Cite this