In this paper, in order to solve the problem of radiation emission from high-power magnet power cables for pulse operation in particle accelerators, the diode magnet cables in the enhancer (BRing) of the strong-flow heavy-ion accelerator (HIAF) are used as research objects. Due to the limited space of the radiation cable in the accelerator tunnel, the simulation prediction means focuses on the electromagnetic interference (EMI) propagation mechanism and its suppression method of the high-power cable in the fast pulse operation mode, aiming at solving the beam current diagnostic error and equipment stability problems caused by the radiation emission from the cable in the accelerator system.

To solve the distortion problem of the existing wavelet threshold denoising algorithm when processing electromagnetic signals, an SSA combined with an improved threshold function wavelet denoising algorithm is given. The improved wavelet threshold function has high-order derivability characteristics, which can overcome the problems of hard and soft threshold functions, and the SSA algorithm enhances the adaptivity of the wavelet denoising algorithm to different noises. The algorithm of this paper is applied to simulation experiments and electromagnetic compatibility measured data. The denoising algorithm in this paper improves the SNR by 54.81% and 17.85%, and reduces the RMSE by 54.57% and 29.06%, respectively, compared with the traditional hard and soft threshold denoising algorithms. The results show that the denoising effect is better than the existing wavelet threshold denoising algorithm.

With a focus on the requirements of electromagnetic compatibility measurement and electromagnetic protection design of the Qitai 110-m radio telescope, herein, we constructed a 3-m radio anechoic chamber measurement platform, which provided essential data and technical support for electromagnetic compatibility design and measurement -based performance verification of the large radio telescope. First, we elaborated on the composition of the constructed measurement platform, related equipment performance parameters, the configuration links of the components, and the involved measurement methods, which could be used to perform shielding effectiveness, radiation emission, and radiation susceptibility measurements. Subsequently, we analyzed the differences between the testing results of two measurement standards (GJB 151B and GB/T 9254). Based on the obtained results, we outlined practical application considerations and application examples of the measurement platform, providing important technical support for the electromagnetic compatibility design of large radio telescopes.

The proposed Qi Tai 110m radio Telescope (QTT) is a fully steerable single-dish radio telescope with an observing frequency coverage from 150 MHz to 115 GHz. The QTT will play an important role for fundamental research fields of radio astronomy, such as pulsars, molecular spectral lines, active galactic nuclei, and VLBI observations [1]. In order to mitigate the potential interference in the buildings at the QTT site, a low-cost shielding scheme is proposed for the buildings, to mitigate medium and low level RFIs. The measured shielding effectiveness shows that the scheme achieves our design goal.

The construction of Radio Quiet Zones (RQZ) is an important guarantee of the radio telescope. According to the local conditions, Qi Tai radio Telescope (QTT) established a protection area with a radius of 30 km, including core area, restricted area and coordination area. The paper focus on the potential RFI sources in the restricted area, such as the villages, mobile communication stations and 35 kV power supply engineering. A simulation method based on topographical radio wave propagation was established to predict the influence of the main interference sources on the QTT. Then we have proposed some mitigated plans for the villages affected observations, mobile communication stations and critical points of 35 kV power supply engineering. Therefore, RFI in restricted area effectively can be mitigated effectively.

Radio environment degrades significantly at Nan Shan 26 m Ra-dio Telescope (NSRT) base due to new and upgraded electrical devices on-site and more establishment of surrounding radio communication services. How do we mitigate them effectively? Firstly, a quasi-real time Radio Frequency Interference (RFI) measurement method is employed for RFI detection and spectral analysis based on the layout for potential on-site interference areas and off-site radio communication services. Our investigation at the frequency bands for pulsar observations (1380–1700 MHz) indicates that transient in-terferences pose the greatest impact on observations. Then we use a portable RFI measurement system for interferences hunting at the NSRT, and the typical characteristics of interferences are analyzed. Secondly, based on the RFI characteristics, main interference sources in the observation room are shielded with shielding cabinets. The results from our shielding efficiency (SE) measurement and evaluation show that these methods work effectively. Furthermore, we propose a Radio Quiet Zone (RQZ) and the regulations for NSRT to mitigate off-site RFIs.

The ongoing Qi Tai Radio Telescope (QTT) which is a steerable 110-m aperture radio telescope has a very high sensitivity of signal detection, thus any weak noise will affect its efficient operation. We proposed a prediction method to lower the electromagnetic interference in the radio quiet zone of QTT site. Firstly, based on the topographic data and topographic features of radio quiet zone of the QTT site, we analyzed the applicability of the existing radio wave propagation model and chosen Longley-Rice and Two-Ray model as the algorithm of the radio wave propagation model of the QTT. By the simulation analysis of radio wave propagation, we got the path loss of the potential interference point when they reached the QTT feed aperture. Secondly, the interference level limits at the position of potential interference point were calculated by combining the QTT feed aperture interference level limits and antenna side lobe gains, and its influence on the radio telescope was predicted and analyzed by combining with the field environment. Finally, the typical village electronic equipment and 35 kV power supply engineering in the QTT restricted area were analyzed by using this method, and the solutions were also proposed correspondingly.

The reactor protection system (RPS) of TMSR-SF1, which is the first 10MW Solid Fuel experiment reactor for Thorium based Molten Salt Reactor (TMSR) Energy system, adopt FPGA as the key technology to develop the system based on the triple modular redundancy system architecture. The RPS prototype was developed follow the TMSR-SF1 conceptual design to demonstrate the function and performance and to test the system reliability. The system design of TMSR-SF1 RPS is introduced in detail in this paper, the emergency trip parameter is also discussed. The hardware & software design of the prototype including the kernel logical board card design, the chassis and cabinet design, the breaker cabinet design, etc. are described. The prototype passed the performance test and the third-party testing, results and discussion are reported.

Safety system testing is one of the most rigorous and time-consuming requirements in the verification and validation process for reactor protection systems (RPSs). This paper presents the development of a test system for the fully digital and field-programmable gate array-based RPS of the solid fuel (SF) thorium-breeding molten salt pebble bed fluoride salt-cooled reactor (TMSR), denoted as the TMSR-SF1 project, developed by the Chinese Academy of Sciences. The test system is applied to the RPS to ensure that it fully meets its designed functions and system specifications. We first introduce the testing principles and methods. Then, the hardware component designs and the software program development of the test system are discussed. Finally, the test process and test results are discussed and summarized.

The reactor protection system (RPS), as a 1E-level safety system, should be designed and developed following a series of nuclear laws and technical disciplines.