Commissioning of vacuum pumping devices of the second KSTAR neutral beam injection system

Kim, K.P.; Park, H.T.; Kim, H.T.; Lee, K.S.; Song, N.H.; Kwag, S.W.; Chang, Y.B.; Cho, W.; Kim, J.S.; Jeong, J.H.; Park, K.R.; Kim, Y.S.

doi:10.1016/j.fusengdes.2019.03.035

Cited by 6 publications

(1 citation statement)

References 2 publications

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“…Since the beam collides with the ion dumps, calorimeters, etc., there is a significant rise in temperature, and the temperature has a greater impact on the movement of gas molecules in the vacuum environment. Therefore, the temperature for the inner wall of the neutralizers, the inner wall of the ion dumps, the inner surface of the calorimeters, the inner wall of the bending magnets, and the surface of the gas baffle was set at 600 K. The temperature of the surfaces of the outer walls of the neutralization chamber, ion dumps, calorimeters, and bending magnets is 400 K [10][11][12].…”

Section: Simulation Parameter Settingmentioning

confidence: 99%

Vacuum System Optimization for EAST Neutral Beam Injector

et al. 2021

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The neutral beam injector (NBI) generates a high-energy ion beam and neutralizes it, and then relies on drift transmission to inject the formed neutral beam into the fusion plasma to increase the plasma temperature and drive the plasma current. In order to better cooperate with the Experimental Advanced Superconductive Tokamak (EAST), part of the Chinese major national scientific and technological infrastructure, in carrying out long-pulse high-parameter physics experiments of 400 s and above, this paper considers the optimization of the current design and operation of the NBI beam line with a pulse width of 100 s. Based on an upgraded and optimized NBI vacuum chamber and the structure of the beam-line components, the gas-source characteristics under the layout design of the NBI system are analyzed and an NBI vacuum system that meets relevant needs is designed. Using Molflow software to simulate the transport process of gas molecules in the vacuum chamber, the pressure gradient in the vacuum chamber and the heat-load distribution of the low-temperature condensation surface are obtained. The results show that when the NBI system is dynamically balanced, the pressure of each vacuum chamber section is lower than the set value, thus meeting the performance requirements for the NBI vacuum system and providing a basis for subsequent implementation of the NBI vacuum system upgrade using engineering.

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Section: Simulation Parameter Settingmentioning

confidence: 99%

Vacuum System Optimization for EAST Neutral Beam Injector

et al. 2021

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Experimental and numerical evaluation of the neutral beam deposition profile in KSTAR

Kang

Lee

et al. 2022

Fusion Engineering and Design

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The measurement of carbon density profile using charge exchange spectroscopy in KSTAR

Lee

et al. 2022

AIP Advances

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The first measurement of the impurity density profile via charge exchange spectroscopy (CES) has been successfully achieved in KSTAR. Since the neutral beam density profile is essential for the measurement, the neutral beam penetration code that was originally developed for the Alcator C-mod tokamak has been optimized for the KSTAR experimental environment. The method of the impurity density measurement by the KSTAR CES system is introduced and the sensitivity analysis of various physical parameters, such as the effective charge in the estimation of the impurity density, is performed to examine the validation of the method. This method has been applied to measure the C6+ density profile affected by the resonant magnetic perturbations (RMPs), which is mainly used to suppress the edge localized modes (ELMs) in KSTAR. The dynamics of the C6+ density profile represent that the C6+ density decreases immediately after the application of RMPs but recovers soon during the ELM-suppressed phase.

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Commissioning of vacuum pumping devices of the second KSTAR neutral beam injection system

Cited by 6 publications

References 2 publications

Vacuum System Optimization for EAST Neutral Beam Injector

Vacuum System Optimization for EAST Neutral Beam Injector

Experimental and numerical evaluation of the neutral beam deposition profile in KSTAR

The measurement of carbon density profile using charge exchange spectroscopy in KSTAR

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