Abstract
The deflection magnet (DM) is the most important component of the Neutral Beam Injection (NBI) system of Experimental Advanced Superconducting Tokamak (EAST), which can magnetically deflect the un-neutralized charged particles after the neutralized process of the beam is extracted from the ion source, and then form a neutral beam injected into the tokamak. Under the operating conditions of the NBI system, by using the thermocouple monitoring system in the experiment, it can be found that the currently operating DM beam collimator has a quite high temperature rise. It is necessary to redesign the DM beam collimator to improve its heat transfer performance. The parallel arrangement of multiple rows of tubes is proposed as the basic method for the redesign of the beam collimator of DM, the thermal-fluid-structure analysis model of this redesign model is established and its temperature field, pressure field and stress field are analyzed. Taking the surface temperature of the beam collimator, the overall dimension after the total tube combination and the pressure drop of the whole structure of collimator as the optimization objectives, and setting the fluid velocity, the tube’s inner diameter and the number of tube rows as the design variables, the optimized design scheme of the beam collimator structure is obtained. From the results of simulation, the new structure can better meet the operation requirements of DM, and its maximum temperature rise is well controlled, which is expected to meet the long pulse operation requirements of the NBI system. The proposed simulation and design optimization method can provide a certain reference for the design and optimization of other high-heat-flux structures in complex large-scale neutral beam systems in the future.
Highlights
The Experimental Advanced Superconducting Tokamak (EAST) has achieve more than 100 s pulse length to maintain the plasma condition
The deflection magnet (DM) is one of the key components of the Neutral Beam Injection (NBI) system concerning the formation of the neutral particle beam [2]
The EAST-NBI system uses the magnetic deflection method, and the detail arrangement of its DM is shown in Energies 2022, 15, x FOR PEER REVIEW
Summary
The Experimental Advanced Superconducting Tokamak (EAST) has achieve more than 100 s pulse length to maintain the plasma condition. According and the stainless steel cooling water pipe is fixed inside the copper plate by vacuum bra to the experimental operation results of EAST-NBI (more than 65 Kev), the original design ing, resulting in certain contact thermal andadopts a poor heat exchange effect. Inother order to improve the pulse operation time andit,realize the fusion-related high heat flux components, there are kinds ofbehind improved particle bombardment to components, especially the many cryogenic pump thestructur beam collimators are still recommended to adopt the plate structure, according to the requirements of can pulses greater than 100 heat s [8]exchange or even of longer, the structure of design scheme that be used to strengthen collimators of DM [9–12. For the new design of DM collimators, it is very important to perform the thermo-hydraulic and thermo-mechanical analysis to carry out structural optimization and obtain the optimal structure
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