Simulation of the multi-channel motional Stark effect diagnostic on EAST Tokamak

Yu, Qingjiang; Fu, Jia; Liao, K. T.; Li, Yichao; Chen, Dong; Li, Yingying; Rowan, W. L.; Huang, He; Zhang, Hongming; Wang, Fudi; Wu, Zhenwei; Wan, Baonian; Ye, Minyou; Lyu, Bo

doi:10.1016/j.fusengdes.2020.111516

Cited by 2 publications

(3 citation statements)

References 10 publications

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“…The more tangential beamline (NBI-2L) was selected as the observation target because of better spatial resolution. When viewing from the port C, the radial cross-section between the sightline and the neutral beam is relatively small, the equivalent spatial resolution ranges from 0.9 to 2.3 cm according to the simulation results, which meets the current distribution demand [13]. The MSE periscope installed in the port C is illustrated in figure 1, which consists of a cover glass, a mirror, a sealing glass, a dual-PEM system, a polarizer, and a collecting lens.…”

Section: Optical Layoutmentioning

confidence: 53%

“…The interested wavelength range (center wavelength of the σ component) is selected by the narrow bandpass filter. Based on the previous simulations, the full width at half maximum (FWHM) of the filter passing band should be 0.4 nm in order to obtain a high signal-to-noise ratio and strong signal at the same time [13]. The manufacturer of the filter is ALLUXA corporation, and the FWHM of the filter is 0.28±0.1 nm, due to assembly error, the test result is about 0.4 nm.…”

Section: Filter Couplermentioning

confidence: 99%

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Development of an upgraded motional Stark effect diagnostic system on EAST tokamak

Li¹,

Fu²,

Hu³

et al. 2023

Plasma Sci. Technol.

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A new multi-channel motional Stark effect (MSE) diagnostic system has been developed on the upgraded EAST tokamak, which was installed on the C port to observe a tangential neutral beam. A telecentric imaging lens was deployed to ensure a uniform illumination from the core to the boundary. A square fiber head which contained 23 fiber bundles was mounted to this imaging lens; each fiber bundle contained 19 fibers and two of them were assigned to CXRS and BES spectrometer respectively. The angle tuning method was used for matching the Doppler shift of the σ component’s wavelength which was caused by the beam voltage. At the present stage, the MSE system only contains ten channels that would be extended to 23 channels in the future, covering a measurement range from R = 1.8 m to R = 2.27 m with a temporal resolution of 10 ms and a spatial resolution of 3 cm. The polarization angle constrained q profiles and current density profiles were reconstructed with EFIT equilibrium reconstructions. In the sawtooth discharges, the q = 1 surface position was validated by the ECE signals, which further verified the rationality of the MSE measurement.

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Section: Optical Layoutmentioning

confidence: 53%

Section: Filter Couplermentioning

confidence: 99%

Development of an upgraded motional Stark effect diagnostic system on EAST tokamak

Li¹,

Fu²,

Hu³

et al. 2023

Plasma Sci. Technol.

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“…For instance, the optical system is complex and sensitive, requiring precise calibration. Additionally, its reliance on neutral beam injection (NBI) and restrictions on the observation space are factors that cannot be overlooked [34][35][36][37]. Due to the potential sensitivities and uncertainties associated with diagnostic methods, our approach of refining equilibrium calculations, as will be demonstrated in section 4, is applicable regardless of the availability of the diagnostics from MSE or POINT.…”

Section: Current Constraint Of East Equilibrium Reconstructionmentioning

confidence: 99%

Equilibrium reconstruction constrained by the consistency of current simulation on EAST

Qian,

Xiang,

Huang

et al. 2024

Nucl. Fusion

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The attainment of a reliable equilibrium is a critical aspect of tokamak experiments and physics analysis. A common method for establishing a reliable equilibrium current involves reconstructing it from indirect measurements, such as those obtained from polarimeter-interferometers (POINT) and motional Stark effect (MSE) systems. However, uncertainties still exist in the reconstruction results. For the equilibrium reconstruction on the EAST tokamak, which is based on the POINT system, the primary sources of uncertainty are the limited scope of measurements and the sensitivity of the reconstruction process. This paper proposes an enhanced approach that utilizes current simulation as a constraint to maintain consistency between the initial equilibrium and the simulated results. The Radio Frequency waves driven current is identified as a particularly influential component due to its interaction with the q profiles of the equilibrium and the deposition region of the waves. Two specific discharges are presented to illustrate how a new equilibrium can be achieved, which enhances consistency between the equilibrium and the simulated current, taking into account the dependencies of various components.

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Simulation of the multi-channel motional Stark effect diagnostic on EAST Tokamak

Cited by 2 publications

References 10 publications

Development of an upgraded motional Stark effect diagnostic system on EAST tokamak

Development of an upgraded motional Stark effect diagnostic system on EAST tokamak

Equilibrium reconstruction constrained by the consistency of current simulation on EAST

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