DIII-D Thomson Scattering Diagnostic Data Acquisition, Processing and Analysis211 Software

摘要

One of the diagnostic systems critical to the success of the DIII-D tokamak211u001eexperiment is the Thomson scattering diagnostic. This diagnostic is unique in 211u001ethat it measures local electron temperature and density: (1) at multiple 211u001elocations within the tokamak plasma; and (2) at different times throughout the 211u001eplasma duration. Thomson 'raw' data are digitized signals of scattered light, 211u001emeasured at different times and locations, from the laser beam paths fired into 211u001ethe plasma. Real-time acquisition of this data is performed by specialized 211u001ehardware. Once obtained, the raw data are processed into meaningful temperature 211u001eand density values which can be analyzed for measurement quality. This paper will 211u001eprovide an overview of the entire Thomson scattering diagnostic software and will 211u001efocus on the data acquisition, processing, and analysis software implementation. 211u001eThe software falls into three general categories: (1) Set-up and Control: 211u001eInitializes and controls all Thomson hardware and software, synchronizes with 211u001eother DIII-D computers, and invokes other Thomson software as appropriate. (2) 211u001eData Acquisition and Processing: Obtains raw measured data from memory and 211u001eprocesses it into temperature and density values. (3) Analysis: Provides a 211u001egraphical user interface in which to perform analysis and sophisticated plotting 211u001eof analysis parameters.