Electromagnetic Shielding Box Design of Radial X-Ray Camera Electronics

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ORIGINAL RESEARCH

Electromagnetic Shielding Box Design of Radial X-Ray Camera Electronics Sheng Zhang1



Xianhe Gao1 • Xueyou Hu1 • Chaoyi Shi1 • Jun Lu1

Ó Springer Science+Business Media, LLC, part of Springer Nature 2020

Abstract In order to ensure the electronics of radial X-ray camera (RXC) system can work normally under the complicated electromagnetic environment of Tokamak system, simulation and analysis of the static magnetic distribution is done in this paper. The electromagnetic shielding box is designed and shielding effort was validated through simulation with software Maxwell. The shielding box designed can reduce the static magnetic flux density from 230 mT to less than 5 mT, meeting the requirements of anti-electromagnetic interference ability of electronics. Keywords Electromagnetic shielding  Electromagnetic simulation  Radial X-ray camera

Introduction The radial X-ray camera (RXC) was designed to measure the poloidal profile of soft X-ray emissions from plasma, which is an important diagnostic system in the Tokamak system. It is used to provide measurements of the low (m, n) magnetohydrodynamic modes, sawteeth, disruption precursors, H-mode, edge-localized modes, and L–H transition. Electronics is a key component of soft X-ray diagnostic system. It determines whether the physical signals detected by sensor array can be successfully transmitted to data acquisition and processing system for researchers to analyze. As known, electronic diagnostic equipments are easily affected by strong electromagnetic interference [1, 2], so the design of electromagnetic compatibility is important to the electronic diagnostic system. In order to enhance the anti-electromagnetic interference ability of diagnostic equipments, DIII-D fusion facility in the United States, JET facility in Britain and EAST facility in China have adopted anti-electromagnetic interference measures, such as reasonable grounding, using shield wire and shielding box, etc. The diagnostic equipments are usually installed in the middle of the diagnostics shielding module (DSM) of equatorial port plug. The static & Xianhe Gao [email protected] 1

magnetic flux density is as high as 230 mT. Detector array used to detect X-ray is an import part of diagnostic equipments. The current signal converted by detector is weak (about 10 nA–10 uA), with long distance transmission of 130 m to the data acquisition center, and differential pre-amplifier is used to amplify the weak signal. So, it is difficulty to the design of electronics system in complex electromagnetic interference environment [3]. The quality of signal detection is directly related to the performance of soft X-ray diagnostic system.

Soft X-Ray Electronic Diagnostic System The soft X-ray diagnostic system is mainly composed of photoelectric detector, pre-amplifier, intermediate amplifier and data acquisition system [4] (shown in Fig. 1). The detector array consists of 35 channels photodiode, which can convert soft X-ray into a current signa