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Fabrication of Organic-inorganic Composite Nanofiltration Membrane Based on PET Ion Track Membrane
Shengming MA, Zhihao LIANG, Xingfan WANG, Zaichao GUO, Jie LIU, Jinglai DUAN, Dan MO, Huijun YAO
2023, 40(1): 92-98. doi: 10.11804/NuclPhysRev.40.2022011  Published:2023-03-20
Keywords: nanofiltration, composite membrane, ion track membrane
Nanofiltration membranes are playing more and more important roles in the fields of sea water desalination and drinking water purification. The ion track membrane (ITM), as a kind of important separation membrane with uniform pore size, regulable pore density, and free-defect surface, has potential permission in water treatments and precise separation. The thin ITMs with high pore density as substrates have great potential in the preparation of high-performance nanofiltration membranes. Herein, we report a triple-layered organic-inorganic composite membrane with zirconia (ZrO2) as a selective layer and polyethylene terephthalate ion track membrane (PET ITM) as support. The polydopamine (PDA)-polyethyleneimine (PEI) intermediate coating facilitates inorganic nanoparticles to form an inorganic layer on the membrane surfaces. The composite membrane can achieve partial rejection for various kinds of salts and exhibit a salt retention order of Na2SO4>MgSO4>MgCl2>NaCl.
Development and Validation of Lattice Adjustment Application Based on PACS under DC/Pulse Dual-mode
Guimei MA, Jie LIU, Jiancheng YANG, Weiping CHAI, Yunpeng ZHU, shuang RUAN
2020, 37(4): 842-847. doi: 10.11804/NuclPhysRev.37.2019057  Published:2020-12-20
Keywords: PACS, accelerator physics control system, lattice adjustment, OOP
To reduce the amount of duplication efforts of physical and program developers, a portable, extensible and maintainable PACS (Physics-oriented Accelerator Control System) is proposed and implemented for heavy ion accelerator facilities by IMP (Institute of Modern Physics, Chinese Academy of Sciences). For testing the feasibility of the PACS, a lattice adjustment application and its new GUI for both DC and pulse modes is programmed by Python language. The DC mode, built with the SQL database and soft IOC of the EPICS, is performed in the HIRFL-CSRe. In addition, the pulse mode is tested in the HIRFL-CSRm. The testing results show that the tune adjustment and optics calculation in the two modes are implemented successfully, and the PACS can provide the interfaces between the modules and layers. Therefore, the framework of the PACS is feasible.
Simulation Study of the Beam Loading Effects During the Bunch Merging in HIAF-BRing
Fucheng CAI, Jiancheng YANG, Jiawen XIA, Dayu YIN, Jie LIU, Guodong SHEN, Geng WANG, Shuang RUAN, Liping YAO, Xiaoqiang CHEN
2020, 37(2): 180-185. doi: 10.11804/NuclPhysRev.37.2019058  Published:2020-07-15
Keywords: HIAF-BRing, wake field, beam loading effect, bunch merging, potential well distortion
In the booster ring (BRing) of the High Intensity heavy-ion Accelerator Facility (HIAF), the multi-bunch should be merged into single bunch after the acceleration. To study the influence of the beam loading effects during the bunch merging, the simulations of particle tracking with 238U35+ beam are carried out. According to the simulation results, during the bunching merging, the beam loading effects can result in the growth of the momentum spread and the bunch length as well as the oscillation of the bunch length and the bunch center. The potential well distortion induced by the wake voltage and wake field coupling during the bunch merging are the reasons why the bunch center oscillates and the emittance of the beam grows. To reduce the influence of the beam loading effects, the multi-harmonic feed-forward system is employed to compensate the wake voltage. With the feed-forward system, the beam loading effects can be compensated during the bunching merging. The feed-forward system is able to guarantee the high quality of the beam for extraction in the BRing. The frequency range to be covered and the largest wake voltage to be compensated by the feed-forward system are determined according to the simulation results.
Single-event Upsets (SEUs) Induced by Heavy Ions in 14-nm FinFET SRAM
Lihua MO, Bing YE, Jie LIU, Zhangang ZHANG, Teng TONG, Youmei SUN, Jie LUO
2021, 38(3): 327-331. doi: 10.11804/NuclPhysRev.38.2021015  Published:2021-09-20
Keywords: FinFET SRAM, heavy ion, single-event upset(SEU), angle effect
The characteristic of single-event upset(SEU) in a 14-nm bulk fin field-effect transistor (FinFET) static random access memory(SRAM) is investigated by heavy-ion experiments. The linear energy transfer(LET) threshold 0.1 MeV/(mg/cm2) is obtained by fitting the SEU cross-section using the Weibull function. The contribution of multiple-bit upset(MBU) is investigated. The results show that when the LET is equal to 40.3 MeV/(mg/cm2), greater than 95% of SEU comes from the MBU. Additionally, the SEU cross-section of the FinFET SRAM presents anisotropies for incident angles associated with the fin direction. This research has a certain kind of guiding role in designing of radiation-hardened complementary metal-oxide semiconductor(CMOS) integrated circuits(ICs) based on FinFET technology.
Design and Simulation of EicC Beam Cooling Scheme
Fu MA, Lijun MAO, He ZHAO, Jie LIU, Guodong SHEN, Jiancheng YANG
2023, 40(1): 36-44. doi: 10.11804/NuclPhysRev.40.2022029  Published:2023-03-20
Keywords: electron cooling, bunched beam cooling, intrabeam scattering, luminosity, collider
The study of the internal structure of nucleons is an important frontier of current theoretical and experimental research. The high-energy scattering experiments are ideal tools for exploring the structure of nucleons. A Polarized Electron Ion Collider(EicC) is proposed based on High Intensity heavy-ion Accelerator Facility(HIAF) by Institute of Modern Physics, Chinese Academy of Sciences. EicC will provide polarized electron and proton beams with a center-of-mass energy of $15 \sim 20$ GeV. The luminosity is up to $2\times10^{33}\ {{\rm{cm}}^{-2}{\rm{s}}^{-1}}$. Effective cooling of the ion beams is needed to achieve the luminosity goal. Due to the characteristics of large initial emittance, high energy and high intensity of ion beam, EicC adopts a two-stage beam cooling scheme. First, a conventional DC electron cooler is used to significantly reduce the ion beam emittance in the Booster ring(BRing). Secondly, a high-energy bunched cooling system based on an energy recovery linear(ERL) is used to suppress the emittance growth of ion beam during the collision in the collider ring(pRing). In this paper, taking the proton beam as an example, the effects of the electron beam size, temperature, magnetic field and lattice function on the cooling rate and cooling process in the EicC beam cooling device are simulated and investigated, and finally the beam cooling parameters that meet the luminosity requirements are obtained.
Investigation of Types and Mechanisms of MTJ Function Failure Induced by Heavy Ion Irradiation
Peixiong ZHAO, Jie LIU, Tianqi LIU, Chang CAI, Qinggang JI, Dongqing LI, Ze HE, Youmei SUN, Hongchao ZHENG
2021, 38(1): 89-94. doi: 10.11804/NuclPhysRev.38.2020036  Published:2021-03-20
Keywords: heavy ion irradiation effect, magnetoresistive memory, magnetic tunnel junction, hard error
We study the physical law of the influence of ion fluence on the electrical properties of magnetic tunnel junctions (MTJ). We find for the first time that high-energy ionization radiation damage caused the failure of MTJ electrical functions in our experiment. The main failure modes are high and low resistance state failures, of which 79.9% are high resistance state failures. Our results show that the damage caused by a single Ta ion with 10.9 MeV/u cannot cause the electrical function of MTJ to fail. Combining theoretical calculations and Monte Carlo simulation analysis, we derive that the damage to the tunnel insulating layer and the ferromagnetic film in the MTJ is the internal cause of high and low resistance state failure.
Study on the Application of PET Ion-track Etched Membrane in Separation and Purification Traditional Chinese Medicine Water Extract
Xingfan WANG, Shengming MA, Xiaoyu GUI, Jingyi MA, Dan MO, Jinglai DUAN, Jie LIU, Huijun YAO
2023, 40(2): 264-272. doi: 10.11804/NuclPhysRev.40.2022028  Published:2023-06-20
Keywords: ion-track etched membrane, clarification and refinement of traditional Chinese medicine, membrane process
The components of Chinese medicine water extract are complex. With the development of traditional Chinese medicine pharmacy, it is urgent to establish a simple and effective separation and purification method for traditional Chinese medicine. Membrane separation technology, as a simple, direct and efficient material separation method, is widely used in the separation and purification of traditional Chinese medicine because of its low energy consumption and no secondary pollution. Using the ion-track etched membrane with different pore diameters to filter the Chinese medicine water extract in multiple steps, and characterizing the filtrate. The impurities above 1 μm can be removed through microfiltration without changing the properties of water extract. Besides, the proteins and starches can also be removed through ultrafiltration. After modification, the active components of traditional Chinese medicine, like paeoniflorin and chlorogenic acid, can be separated by the ion-track etched membrane. The results show that the ion-track etched membrane can be applied to the process of separation and purification of Chinese medicine water extract, which proves that the ion-track etched membrane can be used for the separation and purification of Chinese medicine water extract.