Subjects: Nuclear Science and Technology >> Other Disciplines of Nuclear Science submitted time 2024-05-07
Abstract： Smart-Cut technology is a technique of exploiting both ion implantation and wafer bonding to transfer ultrathin single-crystal layers from a donor substrate to a receiving substrate. In advanced microelectronic systems, as one of the important technical means of heterogeneous integration for semiconductor materials, Smart-Cut technology has been widely concerned by academia and industry. Smart-Cut technology is the process of implanting H+, He+ ions or co-implantation them into the surface of semiconductor materials, and adjusting the implantation parameters (energy, temperature, dose, dose rate, ion implantation sequence, etc.). After the bonding of implanted semiconductor material and substrate at low temperatures, annealing (temperature, time, rate) that generates microcracks parallel to the surface is performed to achieve layer transfer. In this paper, the research progress of the Smart-Cut technology used in the first-, second-, third- and fourth-generation semiconductors in the past two decades is summarized. The microstructure and microcracks nucleation and growth mechanisms are analyzed. The reasons for the exfoliation thresholds of different semiconductors are discussed. The paper is helpful for understanding the application of Smart-Cut technology used in the fabricating of semiconductor devices.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-04-19
Abstract： In order to meet the demand for elementary particle detection and analysis in high-energy physics experiments, modern pixel detector increasingly tends to pursue the performance requirements of low power consumption, high resolution, and high readout efficiency.This paper describes a silicon pixel detector digital-analogue hybrid readout chip named IMPix-N1. The pixel array consists of 16 rows × 16 columns of pixel units, each with an area of 100 μm × 100 μm, and the pixel array part is controlled by a 1-row × 8-column pixel unit as a superpixel, which has a common logic circuit. The chip has a pixel configuration mode and three pixel address readout modes of operation, which realises the measurement, storage and readout of the time, energy and position information of the hitting particles. The time-to-digital conversion circuit (TDC) can simultaneously measure and record the arrival time TOA and the over-threshold time TOT of the particles, with a time measurement accuracy of 5 ns. The IMPix-N1 is suitable for particle detection experiments requiring high temporal and spatial resolution as well as fast data acquisition capabilities.The chip as a whole is designed using the digital-on-top methodology in TSMC 180nm process. The design is simulated to verify the digital circuit of the pixel unit, the super pixel control circuit and the peripheral digital circuits, and the before and after simulation results are consistent and meet the design requirements.
Subjects: Nuclear Science and Technology >> Radiation Physics and Technology submitted time 2024-04-08
Xiaoli Li
Mengxin Xu
Yuan He
Zehua Liang
Shengxue Zhang
Chunlong Li
Lubei Liu
Qitong Huang
Tong Liu
Jiyu Wang
Guochang Liu
Zhi Wang
Tiancai Jiang
Pinan Xiang
Zhijun Wang
Yangyang Yang
Abstract： For the superconducting linac section of the Chinese Accelerator Driven Transmutation Research facility (CiADS) operating in continuous wave (CW) mode, the effect of cavity detuning caused by fluctuations of liquid helium pressure is an important factors for stable operation of low β cavities. Aiming at the phenomenon of unstable operation of half-wave superconducting resonators affected by helium pressure fluctuations, and taking the half-wave superconducting resonator with a frequency of 162.5 MHz and an optimal beta of 0.19(HWR019) applied in CiADS superconducting linac section as an example, the fluctuation of liquid helium pressure and the frequency variation law of the cavity was simulated with the method of numerical simulation. By calculating and analyzing the relationship between the contact area of liquid helium in the cavity, the wall thickness of the cavity, the shape of the liquid helium cooling channel, and the helium pressure sensitivity coefficient (KPress) of the cavity, the goal of reducing the (KPress) value of the HWR019 superconducting cavity to close to 0 was achieved, which effectively ensures the stable operation of the superconducting cavity in CiADS. At the same time, by conducting thermodynamic calculations on the cavity, corresponding enhanced heat transfer schemes were provided, effectively reducing the maximum temperature of the superconducting cavity during operation. The analysis and optimization methods also have reference significance for the same type of low β superconducting cavities.
Subjects: Nuclear Science and Technology >> Radiation Physics and Technology submitted time 2024-04-08
Abstract： Titanium alloy cage lined thin-wall stainless steel vacuum chamber has been proposed by IMP and will be installed on BRing of HIAF for many merits such as high structural strength, small aperture, applicability under extremely high vacuum enviroments, tolerable eddy current effect under fast ramping magnetic field and relatively lower cost than other vacuum chambers for magnet with fast changing field.Titanium alloy linings for vacuum chamber of dipole and quadrupole magnet on BRing will become important source of coupling impedance. Simulation based on wakefield solver and transient solver of CST studio suite has been undertaken to characterize the impedance of titanium alloy linings for vacuum chamber of quadrupole magnet.The Data was used to calculate transverse dipolar impedance of whole ring and mode shift of 78Kr19+ bunch on BRing under different beam intensity by vlasove solver.Results show that horizontal and vertical dipolar impedance of whole ring has changed from 0.70MΩ/m(horizontal) and 0.82MΩ/m(vertical) to 0.33MΩ/m(horizontal) and 0.43MΩ/m(vertical) while the beam intensity threshold of transverse mode coupling instability has been shifted from 2.7x1011ppp to 4.4x1011ppp after impedance mitigation on titanium alloy cage lined thin-wall stainless steel vacuum chamber.
Subjects: Physics >> Nuclear Physics submitted time 2024-03-28
Abstract： Charge exchange reactions with the intermediate energy can be used to study the complex structure of atomic nuclei from the respect of spin-isospin excitation. By utilizing the radioactive beam line at the Institute of Modern Physics, Chinese Academy of Sciences, charge exchange reaction experiments in inverse kinematics can expand the target nuclides to be studied to neutron-rich nuclei and even unstable nuclei. Based on this, a detector system for charge exchange reaction experiments has been designed, which mainly consists of a 3He gas target, TPC and CsI(Tl) arrays, where the TPC and CsI(Tl) arrays form a ΔE-E system. Using simulation software such as Geant4 and Garfield++, the operating conditions of the TPC were optimized, the kinematic intervals and the basic design of the detector for the experimental study were determined, and the particle discrimination ability of the detection system was investigated. Based on the simulation, the detection system was built.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-03-20
Fu Shengwei
Long Jinbiao
Zhan Meiqiang
Lu Chengui
Guo Yufei
Yang Junjie
Zhang Zhe
Yu Yuhong
Lu Fenhua
Liu Tuoqi
Li Zhiyao
Xu Yingfeng
Sun Zhiyu
Yang Herun
Abstract： The properties of working gases in gas detectors,such as the average ionization energy,Fano factor,and drift velocity,have a significant impact on the preliminary simulation,parameter design,and trajectory reconstruction of the detectors.SeF6,as the target working gas in domestic neutrinoless double beta decay experiments,has unknown parameters that need to be investigated.To study the relevant parameters of this gas,a measurement scheme was designed and the accuracy and reliability of the experimental plan were tested using Ar/CH4=90/10(P10) as the working gas.In the experiment,the average ionization energy of P10 was measured using a grid ionization chamber with an 𝛼 source,yielding a value of 27.10±0.04 eV,and the Fano factor was determined to be 0.175±0.001 when the energy resolution reached 0.91% after subtracting noise through calibration electronics.Additionally,the drift velocity was measured using a 266 nm laser and a time projection chamber,and the results were consistent with the Garfield++ simulation results.The experimental results indicate the feasibility of the measurement scheme and demonstrate high reliability of
the measurement results.This provides a solid foundation for further research on the properties of SeF6.
Subjects: Physics >> Nuclear Physics Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-02-27
LUFenhua
TANG Shuwen
FU Shengwei
YAN Duo
MA Peng
YANG Haibo
YU Yuhong
ZHANG Xueheng
WANG Shitao
ZHANG Yongjie
FANG Fang
LIU Tuoqi
XU Yingfeng
LI Zhiyao
LIU Xiangman
WEI Xiaobao
SUN Zhiyu
Abstract： The high-intensity heavy-ion accelerator facility (HIAF) under construction is equipped with an advanced radioactive beam line HFRS, which will provide a new opportunity for the research of high-energy radionuclide beam physics in China.The characteristic of HFRS is high intensity, This puts forward very strict requirements for particle recognition energy loss detector.The traditional energy loss detector generally adopts the analog plug-in technology route of preamplifier, main amplifier and ADC for signal processing.This scheme has some problems, such as slow electronic response, poor flexibility and difficulty in dealing with serious pulse pile-up at high count rate. We propose a new applicable to high count rate energy loss detector scheme.The signal of the energy loss detector is initially amplified by the fast charge sensitive preamplifier, and Then the waveform is directly collected by waveform digitizer and then processed by digital algorithm.And use the Multiple Sampling Ionization Chamber (MUSIC) of secondary beam line of lanzhou RIBLL2 for the radioactive source and beam test.Using the 3 components 𝛼 source test, using digital shaping algorithm processing for acquisition of waveform, energy resolution (FWHM) of up to 1.31%.In RIBLL2 provide 300 MeV/u of 56Fe beam test, uses the time constant of 𝜏f = 2 𝜇𝑠 of fast charge sensitive preamplifier on the count rate is close to 1 MHz is still not occurred pulse pile-up obviously.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics Subjects: Physics >> Nuclear Physics submitted time 2024-02-26
LIUTuoQi
TANGShuWen
SUN Yu
YU Yuhong
FANG Fang
WANG Shitao
ZHANG Xueheng
SUN Zhiyu
LU Fenhua
FU Shengwei
Li Zhiyao
WEI Xiaobao
XU Yingfeng
Abstract： Cosmic rays are used for the calibration of the Veto detector at ETF in HIRFL-CSR of the Cooling Storage
Ring of Heavy Ion Research Facility in Lanzhou(HIRFL-CSR). The work is divided into two parts: position calibration
and time calibration. The hit positions of particles are obtained by position calibration and an uniform standard of the
measurement of particle hit time in the Veto detector is built through time calibration. The information of position and
time of particles serves as important criteria for eliminating changed particle events that hit the neutron wall detector,
providing support for the realization of the physical objectives of the neutron wall detector. A 2.53 cm position resolution
and a 1.09 ns time resolution have been achieved in this paper.
Subjects: Physics >> Nuclear Physics Subjects: Physics >> Atomic and Molecular Physics submitted time 2024-02-22
Abstract： The state-selective single-electron capture process in the collision of N+ ions with He at an energy of 0.64 keV/u has been experimentally studied by the reaction microscopy with a two-fold coincident method, and the state-selective cross-sections and angular distributions of an electron captured into different quantum states of the projectile ions have been obtained. The experimental results show that: the ground state projectile N+(3P) captures a 1𝑠 electron from the He target mainly to the 2𝑝 shell, and the contribution to the higher shells can also be observed; the metastable N+(5S) captures a 1𝑠 electron from the He target mainly to the 2𝑠 shell, with almost no contribution to higher shells. The experimental results are interpreted qualitatively using the potential energy curves of the NHe+ quasimolecular ion, but the reaction window predictions of the molecular Coulomb over-barrier model differ significantly from the experiments. During the capture of the target electron into the 2𝑠 orbital by the metastable projectile N+(5S), a clear oscillatory structure appears in the angular differential cross-section, which is likely to result from Demkov-type transitions.
Subjects: Physics >> Nuclear Physics submitted time 2024-02-16
LIU Yinshen
YANG Xiaofei
ZHANG Peng
HU Hanrui
BAI Shiwei
WANG Shujing
LIU Yongchao
GUO Yangfan
LIN Zheyang
YAN Zhou
MEI Wencon
CHEN Shaojie
NI Xinyue
XIE Bingqi
YE Yanlin
LI Qite
LI Hongwei
HE Chuangye
YANG Jie
LIU Zuoye
Abstract： The basic properties of atomic nuclei including spins, magnetic moments, electric quadrupole moments and charge radii, are sensitive probes to different aspects of exotic nuclear structure, and are also important to investigate the unrevealed nature of interaction between nucleons. Based on multidiscipline, laser spectroscopy is a unique tool to precisely measure the basic nuclear properties mentioned above in a nuclear-model independent way by measuring the hyperfine structure of atoms, ions, or molecules, which has played an important role in the study of exotic nuclear structures across the different regions of the nuclear chart. Basic principles of laser spectroscopy and various types of experimental devices are expounded after the brief history of the hyperfine structure. Furthermore, advantages of utilizing laser spectroscopy in the study of nuclear structure are briefly introduced by taking the radioactive neutron-deficient Pb region as an illustration. In addition, current condition of collinear laser spectroscopy setup has been systematically reviewed, together with the latest progress on collinear resonance ionization spectroscopy offline devices at Peking University. Finally, the developing status and ongoing plan of laser spectroscopy devices for current and future radioactive ion beam facilities in China have been put forward, and the broad prospects of laser spectroscopy in unstable nuclear properties and the fundamental symmetries based on molecular spectroscopy are interpreted.
Subjects: Nuclear Science and Technology >> Nuclear Science and Technology submitted time 2024-02-04
Abstract： CAFE-2 is a superconducting linear accelerator built by the Institute of Modern Physics of the Chinese Academy of Sciences (IMP) in 2021 to carry out research on new superheavy nuclides synthesis, chemical properties of superheavy elements, and the structure and properties of superheavy nuclei. The synchronized timing trigger system is an important subsystem of CAFE-2 and plays a key role in the operation of CAFE-2. The CAFE-2 main synchronization timing system adopts the classical event-based timing system. At the same time, in order to meet the needs of different operation timing and synchronization triggering of CAFE-2 in both accelerator commissioning and terminal operation modes, the synchronization trigger signal of the rotating target modulation is coupled with the main timing CW(Continuous-wave) trigger signal in the terminal operation mode through the design of the coupling circuit and interlocking logic. The problem of different trigger signal sources for CAFE-2 in accelerator commissioning and terminal operation modes is solved. This paper introduces the structure of CAFE-2 synchronous timing trigger system, and describes the principle and scheme of CAFE-2 synchronous timing trigger system in different operation modes.
Subjects: Nuclear Science and Technology >> Nuclear Detection Technology and Nuclear Electronics submitted time 2024-01-22
Abstract： Based on a UMC 55 nm CMOS process, this paper implements a 10 GHz high-performance charge pump phase-locked loop with high-speed output and low power consumption, which can provide a high-frequency differential clock for the data transmission system in particle physics experiments. A dual-branch charge pump with an operational amplifier and dummy MOSFETs is designed to reduce the influence of non-ideal factors on the circuit. A high-speed, low-power 64-divider circuit is designed to convert the 10 GHz differential clock output by the phase-locked loop into a 156.25MHz single-ended clock. An LC voltage-controlled oscillator is designed with a complementary cross-coupled structure, which enables fast start-up with low phase noise. The simulation results show that under the typical process corner, the phase noise of the VCO at 1 MHz frequency offset is -104.14 dBc/Hz. The PLL lock time is about 500ns, the power consumption is 22.34mW, and the peak-to-peak jitter is 6.59ps.
Subjects: Physics >> Nuclear Physics submitted time 2024-01-10
FU Chaoyi
LI Hongfu
SUN Mingze
XING Yuanming
YAN Xinliang
ZHAO Jiankun
ZHOU Xu
PENG Tingwei
ZENG Qi
WANG Meng
ZHANG Yuhu
TU Xiaolin
Abstract： The Lanzhou Heavy Ion Accelerator Cooling Storage Ring(HIRFL-CSR) is an ideal device for studying the decay of highly charged and short-lived isomers. In the lifetime measurement experiment of the short-lived highly charged ion 94mRu44+, we directly observed the decay of 94Ru from 8+ isomer to the ground state, and identified 49 decay events in the observation time window of (20 μs, 180 μs). In order to identify more decay events, a method based on spectral amplitude was studied in this paper. Based on the simulation results, this method can effectively identify decay events within (15 μs, 185 μs). By applying the new identification method to the experimental data processing, 54 decay events were identified within (15 μs, 185 μs). Based on these 54 decay events, the lifetime of 94mRu44+ in the rest frame was calculated to be 194(121) μs. The new lifetime result is within the error range of the previous result 218(148) μs, with higher precision.
Subjects: Physics >> Nuclear Physics submitted time 2024-01-09
J. Hu
Z.Y. Han
Y.J. Li
Z.H. Li
G. Lian
Y.P. Shen
S.Q. Yan
S. Zeng
B. Guo
W.P. Liu
Z. Bai
B.L. Jia
S.L. Jin
J.B. Ma
P. Ma
S.B. Ma
S.W. Xu
Y.Y. Yang
N.T. Zhang
X.D. Tang
Abstract： In Orgueil meteorites, an exceptionally high 22Ne/20Ne abundance ratio or even nearly pure 22Ne is ob#2;served, which is the so-called Ne extraordinary problem. Fossil material of extinct 22Na is believed to be the origin of extraordinary 22Ne, these 22Na nuclides were trapped in grains and incorporated into meteorites in stellar explo#2;sive event. Supernovae and neon-rich novae are the primary events, which are responsible for the production of 22Na through the explosive hydrogen burning process. 22Na(p, γ)23Mg and 19Ne(α, p) 22Na are two crucial reactions in the so-called NeNa-MgAl cycle and the rapid-proton process, which lead to the fast nucleosynthesis up to A=100 nuclide region and the outburst of novae and X-ray bursters. Since many proton resonance levels in odd-A compound nucleus 23Mg may be involved at nova temperature, existing measurements can only provide partial effective information on the 22Na(p, γ)23Mg reaction. Large uncertainties still exist in the astrophysical reaction rates of the two reactions at present. Thick target inverse kinematics method is a very effective way to scan the 23Mg proton resonance levels re#2;lated to the 22Na(p, γ)23Mg reaction via the excitation function of 22Na(p, p) elastic scattering, which could be obtained over a large energy range in one-shot measurement with low-intensity radioactive 22Na beam. In the present work, 22Na+p resonance scattering via thick target inverse kinematics was studied at RIBLL1 radioactive beam line in the HIRFL national laboratory at Lanzhou. A high-purity 22Na beam with an intensity of about 2 × 105 pps was produced via the 1H(22Ne,22Na)n reaction with an alcohol-cooled hydrogen gas target. Time-of-Flight by two plastic scintillator detectors and two parallel-plate avalanche counters were used to monitor the 22Na secondary beam before reaching the (CH2 )n target. The timing information is useful for beam particle identification and the position information is essen#2;tial for 22Na(p,p) elastic scattering kinematics reconstruction. Light recoil particles from 22Na+p reaction system were detected by two sets of double-sided silicon strip detector telescopes centered at 𝜃lab = 0° and 14°, respectively, while the heavy recoil particles were stopped in the (CH2 )n thick target. Two-body kinematics reconstruction of 22Na(p,p) elastic scattering is performed on the event-by-event basis, and an excitation function of 22Na(p,p) is obtained in the energy range of 𝐸c.m. = 1.5 to 4 MeV. Obvious proton resonance structure is observed in the 23Mg compound nucleus, which will be further analyzed with R-matrix nuclear theoretical model.
Subjects: Physics >> Nuclear Physics submitted time 2023-12-11
Abstract： Based on the self-consistent RBUU transport theory, the isospin-dependent in-medium $N Delta rightarrow N Delta$ cross section is investigated. It is found that the isospin effect has obvious influence on the effective mass, as well as the total $N Delta$ elastic scattering cross section in different density regions. With the increase of baryon density, the effective mass splitting between different isospin states of baryons increases gradually. Under the joint effect of density-dependent baryon effective mass splitting, coupling constant, as well as Born terms such as $ sigma- delta$, $ sigma- rho$, $ omega- delta$, $ omega- rho$, the elastic cross-sections of sub-channels with different isospin states exhibit different density-dependent behaviors. The total cross-section has an obvious reduction effect of medium in the low-energy region, and the medium effect is weakened in the high-energy region.
Subjects: Physics >> Nuclear Physics submitted time 2023-12-06
LI Yun-qiu
LI Cong-bo
ZHENG Yun
LI Tian-xiao
WU Xiao-guang
HONG Rui
WU Hong-yi
ZHENG Min
ZHAO Zi-hao
HE Zi-yang
LI Jin-ze
LI Guang-shun
GUO Cheng-yu
NI Lei
ZHOU Zhen-xiang
HE Chuang-ye
LIU Fu-long
ZHOU Xiao-hong
LIU Min-liang
ZHANG Yu-hu
Abstract： High spin states of 94Nb have been studied with the 82Se(18O, p5n)94Nb fusion evaporation reaction at anincident beam energy of 82and 88 MeV. The level scheme of 94Nbhas been modified and extended with 15 newγrays. Based on γ-γcoincidence relationships，DCO ratios and linear polarization measurements, the new level structures in 94Nb have been interpreted in terms of the shell model calculations performed in the configuration space π(1f5/2, 2p3/2, 2p1/2, 1g9/2 ) for the protons and ν(2p1/2, 1g9/2, 1g7/2, 2d5/2 ) for the neutrons.
Peer Review Status:
Awaiting Review
Subjects: Physics >> Atomic and Molecular Physics submitted time 2023-12-03
Abstract： Experimental and theoretical research on X-ray emissions following charge exchange between slow highly charged ions and atomic Hydrogen supply vital atomic data in the study of diagnosing and simulating plasmas in non-equilibrium astrophysical environment. In the present paper, employing the semiclassical multi-channel Landau-Zener (MCLZ) method, we calculated the total cross-section of bare and hydrogenic C, N, O ions charge exchange with hydrogen atoms, and compared it with previously reported experimental results. In C5 + H collision, theoretically calculated cross-sections have large differences with experimental cross-sections. We also compared state-selective cross-sections calculated by classical MCLZ and quantum-mechanical molecular orbital close-coupling(QMOCC) methods in the solar wind ion velocity (or energy) range. For capture to n = 3 shell, MCLZ calculated state-selective cross-section increase with collision energy increasing; For capture to n = 4 shell, MCLZ calculated state-selective cross-section decrease with collision energy increasing; It is lower than two magnitudes as QMOCC method calculated cross-section. Finally, using the Kronos program package developed in the astrophysical field, we calculated the X-ray emission spectrum, line ratio, and hardness ratio of charge exchange of 1000 eV/u O8 by means of recommended cross-section by Janev, and contrast with the MCLZ method calculated results. We consider that the MCLZ calculation has a large uncertainty, which could affect the accuracy of the astrophysical environment simulation. It is required for developing a more accurate full quantum theory.
Subjects: Nuclear Science and Technology >> Particle Accelerator submitted time 2023-11-29
Abstract： The accelerator vacuum monitoring system is an important subsystem in the accelerator control system, which plays an important role in maintaining the normal operation of the accelerator. The design, development and development process of traditional large-scale control systems are highly dependent on physical entities, and the functional testing and performance verification of the whole system are all concentrated in the late stage of the project, resulting in a long development cycle of the control system, higher risks, and a tight time for late field debugging. To this end, industrial virtual debugging and virtual machine technologies were introduced to build a full-level virtual simulation debugging platform for the accelerator vacuum monitoring system. In the early stage of development, parallel collaborative development, full-level virtual debugging and logic rehearsal of the accelerator air monitoring system began to be carried out. Finally, the debugging results were applied to the site through on-site configuration, significantly shortening the time of on-site debugging. Reduce equipment loss and commissioning risk, improve project implementation efficiency and engineering design reliability.
Subjects: Nuclear Science and Technology >> Particle Accelerator Subjects: Electronics and Communication Technology >> Electron Technology submitted time 2023-11-29
Abstract： In light of the current international energy scarcity, nuclear power has emerged as a crucial source of clean energy. Proton accelerators have therefore become a pivotal technology in nuclear waste management. During beamline orbit correction processes, precise calculations of beamline orbit parameters are required. Given the demonstrated effectiveness of neural networks in a wide variety of industry domains, they offer promising potential for high-accuracy data fitting and prediction. Hence, this study proposes a novel direct linear accelerator beamline orbit parameter prediction technique based on edge intelligence computing nodes. This technique leverages BPNN to learn from historical data and generate a powerful model that can be seamlessly deployed to edge computing nodes, thereby accelerating the prediction of BPM location parameters. Furthermore, the proposed approach may be complemented by an adaptive compensation system in the future, which, in combination with edge computing nodes, could enable automatic beamline position correction, thereby achieving beamline orbit correction. Our experimental results demonstrate that FPGA, as an edge acceleration node, can achieve an inference speed of 2.5us, which represents a remarkable performance enhancement of approximately 165.6 times compared to CPU and approximately 7.9 times compared to GPU. The predicted results exhibit an average error of only 0.5%, and they exhibit the desired latency and accuracy characteristics.
Subjects: Physics >> Nuclear Physics submitted time 2023-11-03
HE Yuan
WANG Meng
SUN Zhiyu
HU Zhengguo
XU Hushan
YAN Hexuan
XU Haowei
YIN Guoqing
WANG Pei
ZHANG Jiahui
Li Jinhai
HOU Dongsheng
ZHU Haofan
FAN Rui
XU Xinxing
ZHOU Xiaohong
LIU Zhong
LI Pengjie
WANG Kailong
LIU Jiajian
Abstract： Multinucleon transfer reactions involving heavy actinide projectile and target nuclei hold significant potential as a groundbreaking method to synthesize
neutron-rich superheavy nuclei. The construction of a Principled Spectrometer for Neutron-rich Superheavy Nucleus Research is highly desirable to establish the technical, methodological, and device foundation to explore the stability island in superheavy nuclei and to study the mechanism of multinucleon transfer reactions. The gas cell of the Principled Spectrometer requires a continuous supply of high-purity helium gas to stop the energetic radioactive reaction products and to extract the energy-reduced ions to the subsequent experimental setup. The paper focuses on a newly developed cryogenic purification system for the gas cell of the spectrometer. This cryogenic purification system is designed to provide recyclable and high-purity helium for the Principled Spectrometer. With a series of tests, the cryogenic purification system has been proven to be able to purify the 99% helium gas to 99.999% or higher, fulfilling the requirements of the gas cell when used in conjunction with the chemical purification system.
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