Instrument to synchronize Thomson scattering diagnostic measurements with MHD acitivity in a tokamak
An instrument to synchronize the firing of a ruby laser for a Thomson scattering diagnostic with plasma oscillations was designed, developed, and evaluated. The instrument will fire the laser at a user-selected phase of an input sine or sawtooth wave with an accuracy of +-15/sup 0/. Allowable frequencies range from 20 to 500 Hz for a sawtooth and from 1 to 30 kHz for a sine wave. The instrument also allows synchronization with a sine wave to be enabled by a preselected sawtooth phase. The instrument uses analog signal processing circuits to separate the signal components, remove unwanted components, and produce zero-phase synchronization pulses. The instrument measures the period between zero-phase pulses in order to produce phase synchronization pulses delayed a fraction of the period from the zero-phase pulses. The laser is fired by the phase synchronization pulse. Unwanted signal components are attenuated by bandpass filters. A digitally controlled self-adjusting bandpass filter for sine processing. The instrument was used to investigate the variation of the electron temperature profile with the phase of the x-ray signal from an Impurity Studies Experiment (ISX-B) plasma exhibiting magnetohydrodynamic (MHD) activity.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5639895
- Report Number(s):
- ORNL/TM-9397; ON: DE85012082
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ISX TOKAMAK
PLASMA DIAGNOSTICS
THOMSON SCATTERING
CONTROL SYSTEMS
DATA ACQUISITION SYSTEMS
MAGNETOHYDRODYNAMICS
TOKAMAK DEVICES
X RADIATION
CLOSED PLASMA DEVICES
ELECTROMAGNETIC RADIATION
FLUID MECHANICS
HYDRODYNAMICS
INELASTIC SCATTERING
IONIZING RADIATIONS
MECHANICS
RADIATIONS
SCATTERING
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
700102* - Fusion Energy- Plasma Research- Diagnostics