A real-time digital control, data acquisition and analysis system for the DIII-D multipulse Thomson scattering diagnostic
A VME-based real-time computer systems for laser control, data acquisition and analysis for the DIII-D multipulse Thomson scattering diagnostic is described. The laser control task requires precise timing of up to 8 Nd:YAG lasers, each with an average firing rate of 20 Hz. A cpu module in real-time multiprocessing computer system will operate the lasers with evenly staggered laser pulses or in a burst mode'', where all available (fully charged) lasers can be fired at 50--100 {mu}sec intervals upon receipt of an external event trigger signal. One of more cpu modules, along with a LeCroy FERA (Fast Encoding and Readout ADC) system, will perform real-time data acquisition and analysis. Partial electron temperature and density profiles will be available for plasma feedback control within 1 msec following each laser pulse. The VME-based computer system consists of 2 or more target processor modules (25 MHz Motorola 68030) running the VMEexec real-time operating system connected to a Unix based host system (also a 68030). All real-time software is fully interrupt driven to maximize system efficiency. Operator interaction and (non real-time) data analysis takes place on a MicroVAX 3400 connected via DECnet. 17 refs., 1 fig.
- Research Organization:
- General Atomics, San Diego, CA (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC03-89ER51114
- OSTI ID:
- 6503544
- Report Number(s):
- GA-A-20097; CONF-900557--25; ON: DE91002720
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
CAMAC SYSTEM
COMPUTER ARCHITECTURE
DATA ACQUISITION SYSTEMS
DOUBLET REACTORS
ELECTRON DENSITY
ELECTRON TEMPERATURE
INELASTIC SCATTERING
LASERS
NEODYMIUM LASERS
PLASMA DIAGNOSTICS
REAL TIME SYSTEMS
SCATTERING
SOLID STATE LASERS
THERMONUCLEAR REACTORS
THOMSON SCATTERING
TOKAMAK TYPE REACTORS