High-impedance capacitive divider probe for potential measurements in plasmas

Journal Article · Fri Oct 01 00:00:00 EDT 1982 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1136832· OSTI ID:6801560

Benjamin, N

It is often desirable, though difficult, to measure electric potential changes within a plasma, including variations due to waves and fluctuations. For a broad range of plasma parameters ac floating potential measurements may be made using the high input impedance probe described in this paper. A capacitive divider with an active buffer circuit is incorporated, such that a 50-..cap omega.. line can be driven with a 60-dB dynamic range and 100-MHz bandwidth. Details of the electronic circuit, mechanical construction, and calibration of the probe are given, together with a discussion of the parameter range over which successful measurements may be made.

• Research Organization: Dept. of Engineering Science, University of Oxford, Parks Rd., Oxford, England
• OSTI ID: 6801560
• Journal Information: Rev. Sci. Instrum.; (United States), Vol. 53:10
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA DIAGNOSTICS
PROBES
ALTERNATING CURRENT
CALIBRATION
CAPACITORS
ELECTRIC IMPEDANCE
ELECTRIC POTENTIAL
ELECTRONIC CIRCUITS
EXPERIMENTAL DATA
FLUCTUATIONS
MEASURING INSTRUMENTS
MHZ RANGE
PARAMETRIC ANALYSIS
VARIATIONS
CURRENTS
DATA
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
EQUIPMENT
FREQUENCY RANGE
IMPEDANCE
INFORMATION
NUMERICAL DATA
700102* - Fusion Energy- Plasma Research- Diagnostics