Progress of Thomson scattering diagnostic on HL-2A tokamak

Feng, Zhaochi; Wang, Y.Q.; Hou, Z. P.; Ren, Leilei; Liu, C.H.; Luo, Chih-Wei; Yuan, Huan

doi:10.1088/1748-0221/12/11/c11012

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…The calibration system is mainly composed of a standard light source and an electroscanning monochromator [15]. The light emitted from the standard light source is focused by the lens and converted into pulsed light by the chopper, before entering the monochromator through the UV filter [16]. Then an adjustable monochromatic light source can be output into the polychromator to be calibrated after power measurement for each monochromatic light J (λ)δλ.…”

Section: Thomson Scattering Diagnostic Systemmentioning

confidence: 99%

Integrated data analysis on the electron temperature profile of HL-2A with the Bayesian probability inference method

Pan¹,

Wang²,

Wang³

et al. 2022

Plasma Sci. Technol.

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The data analysis on tokamak plasmas is mainly based on various diagnostic systems, which are usually modularized and independent of each other. This leads to a large amount of data not fully and effectively exploited, so that it is not conducive to reveal the deep physical mechanism. In this paper, Bayesian probability inference (BPI) with machine learning methods has been applied to the electron cyclotron emission (ECE) and Thomson scattering (TS) diagnostic systems on HL-2A/2M, and the effects of integrated data analysis (IDA) on the electron temperature of HL-2A with Bayesian probability inference are demonstrated. A program is developed to infer the whole electron temperature profile with a confidence interval, and the program can be applied in the online analysis. The IDA results show that the full profile of the electron temperature can be obtained and the diagnostic information is more comprehensive and abundant with IDA. The inference models for electron temperature analysis are established and the developed programs will serve as an experimental data analysis tool of HL-2A/2M in the near future.

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Section: Thomson Scattering Diagnostic Systemmentioning

confidence: 99%

Integrated data analysis on the electron temperature profile of HL-2A with the Bayesian probability inference method

Pan¹,

Wang²,

Wang³

et al. 2022

Plasma Sci. Technol.

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show abstract

“…Only band pass filters could not effectively eliminate the stray light, scattering light signals in some spectral channels were then contaminated seriously. A remote control platform [8,9], mainly with three motorized stages and two CCD cameras looking at incidence window and exit window, is then designed and installed in the laser beam input optics of the vertical core-TS system. The two reflecting mirrors can highly reflect laser beams of 1064 nm and 532 nm at 45 degree of incidence angle, the focusing lens and the window glass are coated with anti-reflectance film at 1064 nm and 532 nm.…”

Section: Improvements In the Vertical Core Thomson Scattering Systemmentioning

confidence: 99%

Recent progress on Thomson scattering diagnostic on HL-2A tokamak

et al. 2019

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Some new progress has been made to develop the multi-point Thomson scattering (TS) diagnostic for the HL-2A tokamak physics experiments. Hardware of silicon avalanche photodiode detector electronics, motorized stages to control the laser beam for beam alignment, 3 modules of fast digitizers with more than 100 channels to record the time evolution of the TS pulses at 2.5 GS/s with 12-bit resolution, and 15 polychromators for 15-point measurements of core plasma electron temperature. The data processing code is further adjusted to manage the digitized raw data. The TS intensity is obtained by direct summing method and by Gaussian-function fitting, respectively, and then different value of electron temperature is derived by the technique of weighted least-squares regression. As to the latter, the electrical noise and perturbations of the TS signal is significantly reduced, the resulting value of electron temperature has a better quality than that of the former. New processing code is in development.

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Multipoint vertical-Thomson scattering diagnostic on HL-2A tokamak

Yuan

Wang

Hou

et al. 2018

Review of Scientific Instruments

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Some progress has been made to develop the multipoint Thomson scattering (TS) diagnostic for the HL-2A tokamak physics experiments. Hardware of silicon avalanche photodiode detector electronics is improved, which provides two output signal channels. In one channel, only the rapid TS signal is the output after deducting the influence of the background slow-varying plasma light. In the other, both the rapid TS signal and the plasma background signal are the output. In the latest HL-2A experiment campaign, the newly developed electronics are tested and TS signals can be obtained from each of the two channels, where the signal is digitized by 12-bit transient recorder sampled at 1 GS/s. Laser beam alignment is fulfilled by using motorized stages to control the laser beam passing through ∼10 mm-wide narrow throats of the lower and upper closed divertors with small movements and then the stray laser light is reduced. New modules of fast digitizers with more than 100 channels are installed and will be used to record TS pulse signals. On the basis of these achievements, about 15-point measurements of plasma electron temperature and density by Thomson scattering diagnostic will come into operation in the upcoming HL-2A experiment campaign.

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Progress of Thomson scattering diagnostic on HL-2A tokamak

Cited by 4 publications

References 10 publications

Integrated data analysis on the electron temperature profile of HL-2A with the Bayesian probability inference method

Integrated data analysis on the electron temperature profile of HL-2A with the Bayesian probability inference method

Recent progress on Thomson scattering diagnostic on HL-2A tokamak

Multipoint vertical-Thomson scattering diagnostic on HL-2A tokamak

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