## 当期目录2022年 第39卷  第1期

2022, 39(1): 1-2.

2022, 39(1): 1-15. doi: 10.11804/NuclPhysRev.39.2021075

2022, 39(1): 16-22. doi: 10.11804/NuclPhysRev.39.2021071

2022, 39(1): 23-29. doi: 10.11804/NuclPhysRev.39.2021081

2022, 39(1): 30-36. doi: 10.11804/NuclPhysRev.39.2022001

2022, 39(1): 37-44. doi: 10.11804/NuclPhysRev.39.2021045

Long-term stable operation is one of difficult and frontier topics in the field of high-current linear accelerators. In this article, taking the China initiative Accelerator Driven System(CiADS) accelerator as an example, of whose virtual model implemented with TraceWin software by using simulation data, a segmented failure compensation method of superconducting(SC) cavity by artificial intelligence algorithm has been proposed. The neighboring elements of the failure cavities are used to rematch the beam envelope, while all the downstream cavities are used to compensate the beam energy. Compared with traditional optimization methods, this research can realize the failure compensation of low energy SC section, and has the advantages of fast calculation speed and strong versatility. It provides new feasibility for the practical application of component failure compensation.

2022, 39(1): 45-53. doi: 10.11804/NuclPhysRev.39.2021049

2022, 39(1): 54-64. doi: 10.11804/NuclPhysRev.39.2021011

2022, 39(1): 65-72. doi: 10.11804/NuclPhysRev.39.2021035

To improve the ability of particle identification of the RIBLL2 separator at the HIRFL-CSR complex, a new high-performance detector for measuring fragment starting time and position at the F1 dispersive plane has been constructed and installed, and a method for achieving precise Bρ determination has been developed using the experimentally derived ion-optical transfer matrix elements from the measured position and ToF information. Using the high-performance detectors and the precise determination method, the fragments produced by the fragmentation of 78Kr at 300 MeV/nucleon were identified clearly at the RIBLL2-ETF under full momentum acceptance. The atomic number Z resolution of σZ~0.19 and the mass-to-charge ratio A/Q resolution of σA/Q~5.8×10−3 were obtained for the 75As33+ fragment. This great improvement will increase the collection efficiency of exotic nuclei, extend the range of nuclei of interest from the A<40 mass region up to the A~80 mass region, and promote the development of radioactive nuclear beam experiments at the RIBLL2 separator.
2022, 39(1): 73-80. doi: 10.11804/NuclPhysRev.39.2021039

A statistical correction method is proposed to suppress the pile-up background events in data analysis. This method is verified by a cosmic muon lifetime measurement experiment, achieved by a plastic scintillator detector using the timing coincidence method, where dominant background events originate from pile up muons and electronic noise. To complement the intrinsic shortcoming of relatively rare decay events from registered cosmic muon events in the local laboratory, Monte Carlo simulation is applied to generate large samples in order to cross check the new method. The measurement of the muon lifetime in our setup gives a result of \begin{document}$\tau_\mu^{\rm exp} = 2.19 \pm 0.07 \ \mu \text{s}$\end{document} at 95% confidence level, while the result before applying the correction is \begin{document}$\tau_{\mu}' = 2.27 \pm 0.07 ~\mu \text{s}$\end{document} (95% C.L.). The treatment of pile-up events by a statistical correction equation in this study might be adapted to improve data analysis in the general coincident background dominating experiments.

2022, 39(1): 81-87. doi: 10.11804/NuclPhysRev.39.2021023

TDC(time-to-digital converter)作为基于信号甄别和时间数字转换的时间测量技术路线的主要组成部分之一，至今在诸多领域中都具有广泛的应用。本实验室对高精度时间测量TDC ASIC(Application Specific Integrated Circuit)进行了深入研究，在180 nm CMOS工艺下完成了基于DLL(Delay-Locked Loop)结构的原型芯片的设计，芯片命名为DHR TDC。为了评估原型芯片的相关性能以推进下一步的改版设计，设计了测试电子学模块，构建了相应的电子学测试系统并完成了性能测试。测试结果表明，该TDC具有较好的性能，在实现156 ps的bin size基础上时间精度好于60 ps RMS。同时该TDC在20 µs的动态范围下具有较好的线性，其DNL(Differential NonLinearity)和INL(Integral NonLinearity)分别好于0.13和0.15 LSB (Least Significant Bit)。

2022, 39(1): 88-94. doi: 10.11804/NuclPhysRev.39.2021040

2022, 39(1): 95-100. doi: 10.11804/NuclPhysRev.39.2021029

2022, 39(1): 101-107. doi: 10.11804/NuclPhysRev.39.2021030

A new type of F/M steel (SIMP steel) and two kinds of ODS steels (MA956 and Eurofer-ODS steels) were irradiated by 2 MeV He ions to fluence of 1×1017 ions/cm2 at 500 and 600 °C. After irradiation, swelling behaviors and effect of nanostructures (such as grain boundaries, precipitates and nano-oxide particles) on the nucleation and growth of He bubbles were studied by transmission electron microscope. The results show that both SIMP and Eurofer-ODS steels exhibit better swelling resistance than MA956 ODS steel at 500 °C, because the grain boundaries or precipitates pronouncedly inhibit the growth of He bubbles. The Eurofer-ODS steel shows best swelling resistance due to the inhibition of He bubbles growth by the grain boundary and oxide interface at 600 °C. The present work shows that nanostructures in materials inhibit the process of He bubble growth under high He fluence conditions, but the degree of inhibition varies with different materials.
2022, 39(1): 108-113. doi: 10.11804/NuclPhysRev.39.2021032

2022, 39(1): 114-120. doi: 10.11804/NuclPhysRev.39.2021033

2022, 39(1): 121-126. doi: 10.11804/NuclPhysRev.39.2021064

2022, 39(1): 127-133. doi: 10.11804/NuclPhysRev.39.2021077