Edge ECE measurements with the AUG CTS receiver and the effects of ELMs during H-mode Morten...
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Transcript of Edge ECE measurements with the AUG CTS receiver and the effects of ELMs during H-mode Morten...
![Page 1: Edge ECE measurements with the AUG CTS receiver and the effects of ELMs during H-mode Morten Stejner.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649e875503460f94b8aa85/html5/thumbnails/1.jpg)
Edge ECE measurements with the AUG CTS receiver and the effects of ELMs during H-
mode
Morten Stejner
![Page 2: Edge ECE measurements with the AUG CTS receiver and the effects of ELMs during H-mode Morten Stejner.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649e875503460f94b8aa85/html5/thumbnails/2.jpg)
The Collective Thomson Scattering diagnostic
• Measures the scattering of powerful microwave probe radiation from microscopic collective plasma fluctuations
• Seeks to infer information about the plasma from the scattered spectrum: Temperature, fast ion velocity distribution, plasma composition, rotation …
• The AUG CTS receiver is a heterodyne radiometer with– Sampling frequency 100 kHz– 50 channels covering the range from 105 GHz to 115 GHz– 24 bit resolution (temperature resolution of 0.1 eV )
![Page 3: Edge ECE measurements with the AUG CTS receiver and the effects of ELMs during H-mode Morten Stejner.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649e875503460f94b8aa85/html5/thumbnails/3.jpg)
R
ωce
ECE background in the CTS receiver• The 105 – 115 GHz range corresponds roughly to the electron cyclotron
fundamental frequency on the high field side plasma edge and the 2. harmonic on the low field side
• If the resonances are optically thick the measures signal is directly proportional to the electron temperature
BT = 2.7 T
BT = 2.4 T
![Page 4: Edge ECE measurements with the AUG CTS receiver and the effects of ELMs during H-mode Morten Stejner.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649e875503460f94b8aa85/html5/thumbnails/4.jpg)
Examples of ECE emission
![Page 5: Edge ECE measurements with the AUG CTS receiver and the effects of ELMs during H-mode Morten Stejner.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649e875503460f94b8aa85/html5/thumbnails/5.jpg)
Time traces of individual channels
![Page 6: Edge ECE measurements with the AUG CTS receiver and the effects of ELMs during H-mode Morten Stejner.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649e875503460f94b8aa85/html5/thumbnails/6.jpg)
Conditionally averaged ELM profiles
• Step 1)– Find all the ELMs from an independent signal
(here dst)
![Page 7: Edge ECE measurements with the AUG CTS receiver and the effects of ELMs during H-mode Morten Stejner.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649e875503460f94b8aa85/html5/thumbnails/7.jpg)
Conditionally averaged ELM profiles
• Step 2)– Find the average signal in some time range around
each ELM
![Page 8: Edge ECE measurements with the AUG CTS receiver and the effects of ELMs during H-mode Morten Stejner.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649e875503460f94b8aa85/html5/thumbnails/8.jpg)
![Page 9: Edge ECE measurements with the AUG CTS receiver and the effects of ELMs during H-mode Morten Stejner.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649e875503460f94b8aa85/html5/thumbnails/9.jpg)
![Page 10: Edge ECE measurements with the AUG CTS receiver and the effects of ELMs during H-mode Morten Stejner.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649e875503460f94b8aa85/html5/thumbnails/10.jpg)
![Page 11: Edge ECE measurements with the AUG CTS receiver and the effects of ELMs during H-mode Morten Stejner.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649e875503460f94b8aa85/html5/thumbnails/11.jpg)
Modes in the ECE emission• When the ECE emission is Fourier transformed som discharges
display clear modes
![Page 12: Edge ECE measurements with the AUG CTS receiver and the effects of ELMs during H-mode Morten Stejner.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649e875503460f94b8aa85/html5/thumbnails/12.jpg)
![Page 13: Edge ECE measurements with the AUG CTS receiver and the effects of ELMs during H-mode Morten Stejner.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649e875503460f94b8aa85/html5/thumbnails/13.jpg)