Real-time digital control, data acquisition, and analysis system for the DIII-D multipulse Thomson scattering diagnostic
- General Atomics, San Diego, CA (USA)
A VME-based real-time computer system 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 eight Nd:YAG lasers, each with an average firing rate of 20 Hz. A cpu module in a 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}s intervals upon receipt of an external event trigger signal. One or 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 ms following each laser pulse. The VME-based computer system consists of two 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.
- DOE Contract Number:
- AC03-89ER51114
- OSTI ID:
- 6351604
- Journal Information:
- Review of Scientific Instruments; (USA), Vol. 61:10; ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
Similar Records
Design and operation of the multipulse Thomson scattering diagnostic on DIII-D
Design and operation of the multipulse Thomson scattering diagnostic on DIII-D (invited)
Related Subjects
DOUBLET-3 DEVICE
ELECTRON TEMPERATURE
PLASMA DIAGNOSTICS
THOMSON SCATTERING
DATA ACQUISITION
DATA ANALYSIS
ELECTRON DENSITY
CLOSED PLASMA DEVICES
INELASTIC SCATTERING
SCATTERING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700102* - Fusion Energy- Plasma Research- Diagnostics