A real-time digital control, data acquisition and analysis system for the DIII-D multipulse Thomson scattering diagnostic

Conference · Mon Oct 01 00:00:00 EDT 1990

OSTI ID:6503544

Greenfield, C M; Campbell, G L; Carlstrom, T N; DeBoo, J C; Hsieh, C -L; Snider, R T; Trost, P K

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; TRN: 91-000067
• Resource Relation: Conference: 8. topical conference on high-temperature plasma diagnostics, Hyannis, MA (USA), 6-10 May 1990
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DOUBLET REACTORS
PLASMA DIAGNOSTICS
DATA ACQUISITION SYSTEMS
CAMAC SYSTEM
COMPUTER ARCHITECTURE
ELECTRON DENSITY
ELECTRON TEMPERATURE
NEODYMIUM LASERS
REAL TIME SYSTEMS
THOMSON SCATTERING
INELASTIC SCATTERING
LASERS
SCATTERING
SOLID STATE LASERS
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
700102* - Fusion Energy- Plasma Research- Diagnostics