Data processing and analysis of the imaging Thomson scattering diagnostic system on HT-7 tokamak

Han, Xiaoyan; Shao, Chunqiang; Xi, Xiaoqi; Zhao, Jianlong; Zang, Qing; Yang, Jianhua; Dai, Xingxing; Kado, S.

doi:10.1063/1.4804161

Cited by 9 publications

(6 citation statements)

References 15 publications

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“…Finally, the image size of the EMCCD cathode chip was 8 mm wide for the spectrum from I.I. After calibration, the spectral resolution can be given by [15] With the spectral resolution of the system, the sum of Thomson scattering spectrum counts without the effects of the notch filter is about N real ≈ 1×10 [6] .…”

Section: System Performancementioning

confidence: 99%

“…The method of system data processing including the calibration has been analyzed in detail in Ref. [15]. The relative sensitivity curve of the system has been calibrated with a calibration lamp (tungsten halogen lamp) [15] .…”

Section: System Performancementioning

confidence: 99%

“…[15]. The relative sensitivity curve of the system has been calibrated with a calibration lamp (tungsten halogen lamp) [15] . The relative calibration provides a function between the system sensitivity and the wavelength.…”

Section: System Performancementioning

confidence: 99%

See 2 more Smart Citations

Analysis and Performance of the Thomson Scattering Diagnostics on HT-7 Tokamak Based on I-EMCCD

Shao¹,

Zhao²,

Zang³

et al. 2014

Plasma Sci. Technol.

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A visible light imaging Thomson scattering (VIS-TVTS) diagnostic system has been developed for the measurement of plasma electron temperature on the HT-7 tokamak. The system contains a Nd:YAG laser (λ = 532 nm, repetition rate 10 Hz, total pulse duration ≈ 10 ns, pulse energy > 1.0 J), a grating spectrometer, an image intensifier (I.I.) lens coupled with an electron multiplying CCD (EMCCD) and a data acquisition and analysis system. In this paper, the measurement capability of the system is analyzed. In addition to the performance of the system, the capability of measuring plasma electron temperature has been proved. The profile of electron temperature is presented with a spatial resolution of about 0.96 cm (seven points) near the center of the plasma.

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Section: System Performancementioning

confidence: 99%

Section: System Performancementioning

confidence: 99%

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Analysis and Performance of the Thomson Scattering Diagnostics on HT-7 Tokamak Based on I-EMCCD

Shao¹,

Zhao²,

Zang³

et al. 2014

Plasma Sci. Technol.

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“…JT-60U (1999) [33] Nd-YAG laser GS ICCD Pegasus Toroidal [7,15,16], TVTS (532 nm) HT-7 [34] D3-D (1990) [2,3], JT-60U (1999) [23], Alcator C-Mod (1997) [35], JET (2004) [36], Nd-YAG laser IFP APD MAST (2006) [37], RTS (1064 nm) RFX-mod (2007) [4], MST (2008) [21], EAST (2011) [38], NSTX-U (2012) [39] GS APD TdeV (1988) [11] Alcator C-Mod (1990) [12] Ruby laser IFP MCP-PMT JET (1988) [8,9] LIDAR (short pulse) An incoherent TS system has been designed at the Keda Torus eXperiment (KTX) facility [10] based on a high repetition rate (200 Hz), and high pulse energy (5 J/6.6 ns) Nd-YAG laser. The typical plasma density of KTX is about 𝑛 𝑒 = 1 × 10 19 m −3 and the electron temperature 𝑇 𝑒 ranges…”

Section: Introductionmentioning

confidence: 99%

Design of a multichannel polychromator for KTX Thomson scattering diagnostic

et al. 2023

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A polychromator is designed based on the transmission volume phase holographic grating spectrometer coupled with avalanched photon diodes through fiber bundle and has been successfully implemented on the Keda Torus eXperiment [Plasma Phys. Control. Fusion 56 (2014) 094009] Thomson scattering system. The polychromator is operated with a 1064 nm laser, and the designed spectral range is from about 1000 nm to 1100 nm. The spectral channels have been optimized with a five-channel design to lower the estimated error of the electron temperature and density within 5% and 3% respectively when the temperature is around 100 eV. With a calibration method about the ratio of the channel average responses using bremsstrahlung radiation, we obtain an electron temperature of 7 eV in a typical experiment with low plasma currents.

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“…2~4 A 1064nm laser beam from the TS laboratory is guided by the optical table with 4 reflectors into the tokamak plasma vertically. The laser beam (in red line) is focused into the center of plasma with a width of 4 mm to 2 mm by lens 2,3 . The light scattered by electrons is collected by a Gauss lens into a fiber bundle.…”

Section: Introductionmentioning

confidence: 99%

Vibration analysis of the Thomson Scattering diagnostics optical transmission system on EAST tokamak

Shao¹,

Zang²,

Zhao³

et al. 2014

SPIE Proceedings

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A series of vibration source from the EAST tokamak complicated experimental environment would result in the laser path misalignment and the collected scattered laser signal attenuation, which leads to a measurement error of the Thomson Scattering (TS) diagnostics system. Two methods have been designed for the vibration analysis of the TS diagnostics optical transmission system, a passive one and an active one. The optical transmission system contains of a double deck optical table with 4 reflectors and a photon collection system. The vibration analysis includes 4 points of reflectors along the laser path, 1 point of the photon collection system, and the ground of EAST experimental hall. The passive method used a vibration spectrum analyzer and 7 vertical speed sensors measuring the standard deviation of the vibration noise, which refers to the virtual value of vibration, and a data analysis system. The active method used a hammer to simulate the vibration source of the experimental hall ground, and 15 accelerometers to measure the three-dimensional vibration spectrum of 5 points along the optical transmission system. The vibration isolation efficiency (IE) of the optical transmission system has been presented, and the vibration asynchrony of the 5 points also has been observed. The results of two methods are comparatively studied, and the active one is considered to be more credible.

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Data processing and analysis of the imaging Thomson scattering diagnostic system on HT-7 tokamak

Cited by 9 publications

References 15 publications

Analysis and Performance of the Thomson Scattering Diagnostics on HT-7 Tokamak Based on I-EMCCD

Analysis and Performance of the Thomson Scattering Diagnostics on HT-7 Tokamak Based on I-EMCCD

Design of a multichannel polychromator for KTX Thomson scattering diagnostic

Vibration analysis of the Thomson Scattering diagnostics optical transmission system on EAST tokamak

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