A5079575134- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Laser-Plasma Interactions and Diagnostics
- Particle accelerators and beam dynamics
- Laser-induced spectroscopy and plasma
- Superconducting Materials and Applications
University of Wisconsin–Madison
2022-2024
A set of two newly designed, single-channel Czerny–Turner spectrometers has been deployed at the DIII-D tokamak for measurements motional Stark effect (MSE) split beam emission and C6+ (CVI) carbon charge exchange recombination (CER) high spectral (δλ = 0.13 nm) temporal (1–5 kHz) resolution. High throughput optics (f/# 2.8) allow good signal-to-noise time resolution using fast EMCCD detectors. The MSE allows fitting magnitude direction local B-field, while yields ion temperature toroidal...
Here, we present the design and first calibration results of a new single-channel Fast-Ion D-Alpha (FIDA) spectrometer to be employed at National Spherical Torus Experiment Upgrade (NSTX-U). The Czerny–Turner-type uses custom-designed aspherical lens setup instead mirrors achieves excellent spectral resolution, with high photon throughput through round-to-linear fiber bundle, camera frame rates around 8.4 kHz. blocking bar avoid saturation effects cold D-alpha emission line will allow for...
Abstract A beam emission spectroscopy (BES) diagnostic is designed for studying two-dimensional turbulent dynamics by measuring the Doppler-shifted Balmer-Alpha ( n = 3 → 2) from neutral heating beams on Wendelstein 7-X (W7-X) stellarator. The BES viewing geometry has been determined in conceptual design previously. However, small Doppler shifts and optical throughput compared to a typical demand dedicated efforts assemblies detector module system. We present detailed opto-mechanical...
A novel Motional Stark Effect spectroscopy system has been designed for application at the DIII-D tokamak. The is optimized studies of poloidal and toroidal magnetic field in plasma pedestal region with frame rates up to 10 kHz. Light from an existing high-photon-throughput collection lens analyzed using four single-channel f/2.8 Czerny-Turner spectrometers that use custom-made systems instead mirrors. Each spectrometer two separate outgoing legs operated a positive grating order, which...