Enhancements to the Spectrometer and Analysis Capabilities of the Edge Main Ion Charge Exchange Recombination Spectroscopy System on DIII-D

The DIII-D edge main ion charge exchange (MICER) [1] system's hardware was upgraded with lens based spectrometers and sCMOS cameras. This improves the dynamic range enabling measurements in high gas fueling plasmas, preventing saturation and CCD blooming seen previously. MICER uses the neutral beam induced D-alpha spectrum to measure the local D+ temperature, rotation, and density, as well as parameters related to the neutral beams, fast ions, and magnetic field. The system covers the high field side midplane through to the low field side scrape off layer and has been acquiring data for most shots in the past ~10yrs. The complexity of the D-alpha spectrum provides a wide range of measurements, but is challenging and time consuming to analyze, meaning only select shots were analyzed. In addition to the hardware upgrades, accelerated analysis of historical data has been achieved through machine learning techniques. This acceleration is due to the rapid pre-fitting of raw spectra and neural network-based corrections for atomic physics effects. These new techniques utilize larger compute resources, enabled by high-performance data transfers using the Globus infrastructure.