The Wide Emission Spectral (WiSE) Diagnostic on DIII-D

The Wide Spectral Emission (WiSE) diagnostic is a set of 10 absolute intensity calibrated, moderate spectral and temporal resolution spectrometers co-viewing vertically through the plasma being implemented on the DIII-D fusion device for study of neutral, ions, and molecules. Working together with existing extreme ultraviolet (EUV) and vacuum ultraviolet (VUV) diagnostics, this system provides a spectral `footprint' of a tokamak plasma from 185 nm up through 5000 nm, all along a coincident line-of-sight, spanning the deep ultraviolet (DUV), ultraviolet (UV), visible (VIS), near infrared (NIR), short-wavelength infrared (SWIR) and medium wavelength infrared (MWIR) bands. Light from the plasma passes through a UV-grade sapphire viewport, then is collected with a fused silica-sapphire triplet lens and is transmitted from the machine to up to 10 separate instruments using a multi-pronged fiber bundle. Each spectrometer is capable of 0.5-4.5 kHz operation and is paired with a dedicated compact PC for operation and data acquisition. Details of design choices for the WiSE diagnostic will be presented, with implications for study of plasma parameters, impurity content, line-ratios, radiated power, and transients, along with beneficial implications for boundary code validation in DIII-D.