Estimating the performance of lithium beam measurements of current density and electron density in an H-mode pedestal
| Autor: | K. T. Liao, Daniel Thomas, William L. Rowan, B. Z. Zhao, Max E Austin |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Electron density Photomultiplier Materials science Physics::Instrumentation and Detectors Aperture business.industry Avalanche photodiode 01 natural sciences 010305 fluids & plasmas Optics Pedestal Physics::Plasma Physics 0103 physical sciences Physics::Accelerator Physics Edge-localized mode business Instrumentation Current density Beam (structure) |
| Zdroj: | The Review of scientific instruments. 89(10) |
| ISSN: | 1089-7623 |
| Popis: | The lithium beam is an effective diagnostic tool for investigation of stability and particle transport in the pedestal. It was used successfully to measure edge current density on DIII-D, achieving qualitative agreement with neoclassical models. Electron density profiles were also measured. Proposed upgrades will continue these measurements with higher reliability as well as explore edge current measurements using spectroscopy. The optics will be redesigned to optimize throughput and aperture broadening and to replace the photomultiplier tubes with avalanche photodiodes. The new system will yield detailed measurements of the pedestal, complementing existing diagnostics for investigating pedestal stability, edge localized mode cycle, and particle transport through the pedestal. |
| Databáze: | OpenAIRE |
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