Fast modulating electron cyclotron emission (FMECE) diagnostic for tokamaks
| Autor: | Max E Austin, Saeid Houshmandyar, Ruifeng Xie, William L. Rowan, Hailin Zhao |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Tokamak business.industry Cyclotron Yttrium iron garnet Slew rate 01 natural sciences 010305 fluids & plasmas law.invention chemistry.chemical_compound Length measurement Optics Band-pass filter Intermediate frequency chemistry law 0103 physical sciences Electron temperature business Instrumentation |
| Zdroj: | Review of Scientific Instruments. 92:033510 |
| ISSN: | 1089-7623 0034-6748 |
| DOI: | 10.1063/5.0043761 |
| Popis: | Utilizing variable-frequency channels, e.g., yttrium iron garnet (YIG) bandpass filters, in the intermediate frequency (IF) section of an electron cyclotron emission (ECE) radiometer facilitates flexibility in the volume viewed by the ECE channels as well as high resolution electron temperature and temperature fluctuation measurements in tokamaks. Fast modulating electron cyclotron emission (FMECE), a stand-alone IF section with eight channels, is a novel application of YIG filters for real-time electron temperature gradient and gradient scale length measurements. Key to FMECE is a simultaneous input/output data acquisition unit, as well as a modified type of YIG filters, which is capable of fast switching of their center (set) frequencies with a frequency slew rate of 600 µs/GHz. A new FMECE has been implemented and tested on the DIII-D tokamak, demonstrating its capability in real-time gradient measurements. The data presented here shows that FMECE can identify flattening in the electron temperature profile; the latter can be used as a sensor for real time monitoring and control of plasma instabilities. Implementation and application are planned for the EAST tokamak. |
| Databáze: | OpenAIRE |
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