Microprocessor-controlled phase analysis for a 2-mm microwave interferometer on the TCA tokamak

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

DOI:https://doi.org/10.1063/1.1137030· OSTI ID:5572682

Lister, J B; Means, R W; Oberson, P

The method of phase analysis is presented for a 2-mm microwave interferometer built to measure the plasma density in a tokamak. Use is made of a fast phase shifter (FPS) constructed from a switchable four-port circulator to resolve the phase ambiguity inherent in a simple interferometer. The phase between 0--2..pi.. is calculated by a microprocessor accessing a look-up table and the total phase is calculated by taking the 0 to 2..pi.. crossings into consideration. It is software controlled and the complete sampling and analysis cycle takes 24 ..mu..s which is sufficiently rapid for the application considered. The phase information is available in analog and digital form.

• Research Organization: Centre de Recherches en Physique des Plasmas, Association Euratom-Confederation Suisse, Ecole Polytechnique Federale de Lausanne, CH-1007 Lausanne, Switzerland
• OSTI ID: 5572682
• Journal Information: Rev. Sci. Instrum.; (United States), Vol. 53:5
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
TOKAMAK DEVICES
MICROWAVE RADIATION
PHASE SHIFT
COMPUTER CODES
CONTROL
INTERFEROMETERS
MATHEMATICAL MODELS
MICROPROCESSORS
PLASMA DENSITY
CLOSED PLASMA DEVICES
COMPUTERS
ELECTROMAGNETIC RADIATION
ELECTRONIC CIRCUITS
MEASURING INSTRUMENTS
MICROELECTRONIC CIRCUITS
RADIATIONS
THERMONUCLEAR DEVICES
700102* - Fusion Energy- Plasma Research- Diagnostics