Plasma start-up design and first plasma experiment in VEST

An, Younghwa; Lee, Jeong‐Won; Lee, HyunYeong; Jo, JongGab; Jung, Bokyung; Chung, Kyoung−Jae; Kim, Young-Gi; Jo, Junghyo; Yang, Jianhua; Na, Yong-Su; Hahm, T.S.; Hwang, Y.S.

doi:10.1016/j.fusengdes.2015.05.015

Cited by 17 publications

(12 citation statements)

References 18 publications

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“…Note that the background neutrals should be ionized by this toroidal current generated by the transformer [25]. Second, OH coils should be positioned to minimize the stray magnetic fields in the region where the plasma is formed [4,26].…”

Section: Oh System Of the Taban Tokamakmentioning

confidence: 99%

“…The size and shape of the chamber as well as the TF magnitude at the center of the plasma have been selected after OH system design. Equation (4) indicates that the maximum current of the tokamak depends on the size and TF magnitude. The OH bank Figure 7.…”

Section: Oh System Of the Taban Tokamakmentioning

confidence: 99%

“…The toroidal plasma column tends to radial extension due to the higher magnetic pressure of the inner rather than in the outer region. This extending force is balanced by the force that has arisen from the interaction between the toroidal plasma current and equilibrium magnetic field of the external coil [4]. The z component of the required EF for the circular plasma shape is solved where, R and a are major and minor radii, respectively, and l is the internal inductance/unit length, for a uniform current density The EF generates a net J B   force directed radially inward, which creates the radial plasma equilibrium.…”

Section: Ef Of the Taban Tokamakmentioning

confidence: 99%

“…The EF fast and slow bank capacitance must be chosen to match the respective fast and slow bank quarter-periods of the OH current waveform. In addition, the voltage of the fast and slow banks must be selected to provide B V for the predicted plasma current of equation (4). Under general assumptions for a small tokamak, a magnitude of B V can be calculated:…”

Section: Ef Of the Taban Tokamakmentioning

confidence: 99%

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Design, simulation and construction of the Taban tokamak

Mirzaei¹,

Amrollahi²

2018

Plasma Sci. Technol.

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Section: Oh System Of the Taban Tokamakmentioning

confidence: 99%

Section: Oh System Of the Taban Tokamakmentioning

confidence: 99%

Section: Ef Of the Taban Tokamakmentioning

confidence: 99%

Section: Ef Of the Taban Tokamakmentioning

confidence: 99%

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Design, simulation and construction of the Taban tokamak

Mirzaei¹,

Amrollahi²

2018

Plasma Sci. Technol.

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“…The Thomson scattering (TS) diagnostics system is widely being used for measuring the electron temperature and the density of the fusion plasma devices. However, establishing this system is quite challenging for low density plasmas such as in Versatile Experiment Spherical Torus (VEST) [1], due to the extremely small cross section of the TS (∼ 10 −30 m 2 ) and the low laser energy (∼ 0.6 J/pulse). Therefore, a TS system has been carefully designed for VEST to maximize the number of collected photons [2].…”

mentioning

confidence: 99%

Calibration of Thomson scattering system on VEST

et al. 2017

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The Thomson scattering system has been recently installed on Versatile Experiment Spherical Torus (VEST) to measure the electron temperature and the density of the core plasmas. Since the calibration of the system is required for the accurate measurement of these parameters, a polychromator and the system efficiency are calibrated. The bias voltage of the detector is optimized and the relative responsivity of the polychromator is measured to analyse the spectral broadening. The tendency of decreasing responsivity because of the ambient temperature change is addressed together. The efficiencies of the alignments using HeNe laser and Nd:YAG laser are compared. After the alignment using Rayleigh scattering, it is improved ∼ 7 times while the peak signal of the stray light is decreased. To evaluate the efficiencies of the alignment using HeNe laser, it is compared with the efficiency of the fine alignment by Rayleigh scattering. After absolute calibration is done, the Thomson scattering signal is estimated theoretically. The Bayesian analysis is tried using the synthetic data, and the results show that the input temperature and the density are inside the contour of the 90% confident level. The calibrated Thomson scattering system will provide the meaningful information of the core plasma of the VEST.

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First Results and Plasma Current Start-Up in Taban Tokamak

Mirzaei

Amrollahi

2019

J Fusion Energ

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Plasma start-up design and first plasma experiment in VEST

Cited by 17 publications

References 18 publications

Design, simulation and construction of the Taban tokamak

Design, simulation and construction of the Taban tokamak

Calibration of Thomson scattering system on VEST

First Results and Plasma Current Start-Up in Taban Tokamak

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