System validation of CO<sub>2</sub>-laser-based phase contrast imaging on HL-2A tokamak

Yi Yu; Shaobo Gong; Min Xu; Boda Yuan; Yifan Wu; Lin Nie; Rui Ke; Minyou Ye; Xuru Duan

doi:doi:10.3788/COL201816.121201

Chinese Optics Letters, 2018, 16 (12): 121201, Published Online: Dec. 7, 2018

System validation of CO₂-laser-based phase contrast imaging on HL-2A tokamak

Yi Yu ¹Shaobo Gong ^1,2Min Xu ^2,*Boda Yuan ^1,2Yifan Wu ^1,2Lin Nie ²Rui Ke ²Minyou Ye ¹Xuru Duan ²

Author Affiliations

¹ School of Physics, University of Science and Technology of China, Hefei 230026, China

² Southwestern Institute of Physics, Chengdu 610041, China

Figures & Tables

Fig. 1. PCI calibration using sound waves launched by a loudspeaker.

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Fig. 2. Signals caught by two detection channels in four independent tests.

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Fig. 3. Power spectra of detected signals in different channels with a 20 kHz sound wave modulation.

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Fig. 4. Power spectra of detected signals with different sound wave modulations in Ch9.

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Fig. 5. Raw signals from five detecting channels with a modulating sound wave frequency of 20 kHz.

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Fig. 6. Time slices of signals from detecting channels after filtering and absolute magnitude calibration.

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Fig. 7. Phase shifts between nearby channels.

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Fig. 8. Frequency-wavenumber spectrum of the signals from the 32 channel detector array after calibration.

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Fig. 9. (a) Voltage amplitudes in detection array; (b) conversion relations of detection array.

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Fig. 10. Raw data of PCI detector element during plasma discharge on HL-2A tokamak; shot number, 34299.

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Yi Yu, Shaobo Gong, Min Xu, Boda Yuan, Yifan Wu, Lin Nie, Rui Ke, Minyou Ye, Xuru Duan. System validation of CO₂-laser-based phase contrast imaging on HL-2A tokamak[J]. Chinese Optics Letters, 2018, 16(12): 121201.

System validation of CO₂-laser-based phase contrast imaging on HL-2A tokamak

Fig. 1. PCI calibration using sound waves launched by a loudspeaker.

Fig. 2. Signals caught by two detection channels in four independent tests.

Fig. 3. Power spectra of detected signals in different channels with a 20 kHz sound wave modulation.

Fig. 4. Power spectra of detected signals with different sound wave modulations in Ch9.

Fig. 5. Raw signals from five detecting channels with a modulating sound wave frequency of 20 kHz.

Fig. 6. Time slices of signals from detecting channels after filtering and absolute magnitude calibration.

Fig. 7. Phase shifts between nearby channels.

Fig. 8. Frequency-wavenumber spectrum of the signals from the 32 channel detector array after calibration.

Fig. 9. (a) Voltage amplitudes in detection array; (b) conversion relations of detection array.

Fig. 10. Raw data of PCI detector element during plasma discharge on HL-2A tokamak; shot number, 34299.

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System validation of CO2-laser-based phase contrast imaging on HL-2A tokamak

Fig. 1. PCI calibration using sound waves launched by a loudspeaker.

Fig. 2. Signals caught by two detection channels in four independent tests.

Fig. 3. Power spectra of detected signals in different channels with a 20 kHz sound wave modulation.

Fig. 4. Power spectra of detected signals with different sound wave modulations in Ch9.

Fig. 5. Raw signals from five detecting channels with a modulating sound wave frequency of 20 kHz.

Fig. 6. Time slices of signals from detecting channels after filtering and absolute magnitude calibration.

Fig. 7. Phase shifts between nearby channels.

Fig. 8. Frequency-wavenumber spectrum of the signals from the 32 channel detector array after calibration.

Fig. 9. (a) Voltage amplitudes in detection array; (b) conversion relations of detection array.

Fig. 10. Raw data of PCI detector element during plasma discharge on HL-2A tokamak; shot number, 34299.

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System validation of CO₂-laser-based phase contrast imaging on HL-2A tokamak