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1. Precise determination of the 2s22p5-2s2p6 transition energy in fluorine-like nickel utilizing a low-lying dielectronic resonance

Author

Wang, S. X., Huang, Z. K., Wen, W. Q., Ma, W. L., Wang, H. B., Schippers, S., Wu, Z. W., Kozhedub, Y. S., Kaygorodov, M. Y., Volotka, A. V., Wang, K., Zhang, C. Y., Chen, C. Y., Liu, C., Huang, H. K., Shao, L., Mao, L. J., Ma, X. M., Li, J., Tang, M. T., Yan, K. M., Zhou, Y. B., Yuan, Y. J., Yang, J. C., Zhang, S. F., Ma, X., and Zhu, L. F.

Subjects
Physics - Atomic Physics
Abstract

High precision spectroscopy of the low-lying dielectronic resonances in fluorine-like nickel ions were determined by employing the merged electron-ion beam at the heavy-ion storage ring CSRm. The measured dielectronic resonances are identified by comparing with the most recent relativistic calculation utilizing the FAC code. The first resonance at about 86 meV due to the dielectronic recombination via (2s2p6[2S1/2]6s)J=1 intermediate state was recognized. The experimental determination of the resonance position at 86 meV reaches an uncertainty of 4 meV, which allows precise determination of the 2s22p5[2P3/2] - 2s2p6[2S1/2] transition energy. The Rydberg binding energy of the 6s electron in the (2s2p6[2S1/2]6s)J=1 state is calculated by the multi-configurational Dirac-HartreeFock and stabilization methods. The determined transition energies are 149.056(4)exp(10)theo and 149.032(4)exp(6)theo, respectively. Moreover, the transition energy has also been calculated by fully relativistic and ab initio approaches. Individual theoretical contributions are evaluated by employing the core-Hartree and Kohn-Sham screening potentials, respectively. High-order QED and correlation effects contribute prominently to the total transition energy. The present DR precision spectroscopy study at the CSRm paves the way for future precision measurements of atomic energy levels with heavier highly charged ions., Comment: 12 pages, 8 figures

Published
2022
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2. Demonstration of electron cooling using a pulsed beam from an electrostatic electron cooler

Author

Bruker, M. W., Benson, S., Hutton, A., Jordan, K., Powers, T., Rimmer, R., Satogata, T., Sy, A., Wang, H., Wang, S., Zhang, H., Zhang, Y., Ma, F., Li, J., Ma, X. M., Mao, L. J., Sha, X. P., Tang, M. T., Yang, J. C., Yang, X. D., Zhao, H., and Zhao, H. W.

Subjects
Physics - Accelerator Physics
Abstract

Cooling of hadron beams is critically important in the next generation of hadron storage rings for delivery of unprecedented performance. One such application is the electron-ion collider presently under development in the US. The desire to develop electron coolers for operation at much higher energies than previously achieved necessitates the use of radio-frequency (RF) fields for acceleration as opposed to the conventional, electrostatic approach. While electron cooling is a mature technology at low energy utilizing a DC beam, RF acceleration requires the cooling beam to be bunched, thus extending the parameter space to an unexplored territory. It is important to experimentally demonstrate the feasibility of cooling with electron bunches and further investigate how the relative time structure of the two beams affects the cooling properties; thus, a set of four pulsed-beam cooling experiments was carried out by a collaboration of Jefferson Lab and Institute of Modern Physics (IMP). The experiments have successfully demonstrated cooling with a beam of electron bunches in both the longitudinal and transverse directions for the first time. We have measured the effect of the electron bunch length and longitudinal ion focusing strength on the temporal evolution of the longitudinal and transverse ion beam profile and demonstrate that if the synchronization can be accurately maintained, the dynamics are not adversely affected by the change in time structure., Comment: 13 pages, 19 figures. Submitted to Physical Review Accelerators and Beams

Published
2020
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3. Incoherent tune measurement of an ion storage ring using single ions

Author

Liao, T., primary, Guo, C., additional, Yan, X. L., additional, Zhou, X., additional, Xing, Y. M., additional, Wang, M., additional, Yuan, Y. J., additional, Zhang, Y. H., additional, Zhou, X. H., additional, Zhang, M., additional, Ge, W. W., additional, Jiao, H. Y., additional, Jiang, Y. L., additional, Mao, L. J., additional, Chen, R. J., additional, Fu, C. Y., additional, Mao, R. S., additional, Yang, J. C., additional, Litvinov, S. A., additional, and Litvinov, Yu. A., additional

Published
2024
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4. Experimental Investigation of the Transition Energy $\gamma_t$ in the Isochronous Mode of the HIRFL-CSRe

Author

Ge, W. W., Yuan, Y. J., Yang, J. C., Chen, R. J., Yan, X. L., Du, H., Li, Z. S., Yang, J., Yin, D. Y., Mao, L. J., Li, X. N., Zheng, W. H., Shen, G. D., Wu, B., Ruan, S., Wang, G., Zhao, H., Wang, M., Sun, M. Z., Xing, Y. M., Zhang, P., Fu, C. Y., Shuai, P., Xu, X., Zhang, Y. H., Bao, T., Chen, X. C., Huang, W. J., Li, H. F., Liu, J. H., Litvinov, Yu. A., Litvinov, S., Zeng, Q., and Zhou, X.

Subjects
Physics - Accelerator Physics
Abstract

The Isochronous Mass Spectrometry (IMS) based on storage rings is a powerful technique for mass measurement of short-lived exotic nuclei. The transition energy $\gamma_t$ of the storage ring is a vital parameter of the IMS technique. It is difficult to measure the $\gamma_t$ and its relation to momentum spread or circulating length, especially to monitor the variation of $\gamma_t$ during experiments. An experimental investigation on the $\gamma_t$ has been performed for the IMS experiment at the Cooler Storage Ring of the Heavy Ion Research Facility in Lanzhou (HIRFL-CSRe). With the velocity measured by two time-of-flight (TOF) detectors, the $\gamma_t$ as a function of orbital length can be determined. The influences of higher order magnetic field components on the $\gamma_t$ function were inferred for isochronous correction. This paper introduces and investigates the influence of dipole magnetic fields, quadrupole magnetic fields and sextupole magnetic fields on the $\gamma_t$ function. With the quadrupole magnets and sextupole magnets corrections, a mass resolution of 171332 (FWHM) and $\sigma(T)/T=1.34\times10^{-6}$ were reached, which shall be compared with 31319 (FWHM) and $\sigma(T)/T=7.35\times10^{-6}$ obtained without correction., Comment: 10 figures,19 pages

Published
2018
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5. A method to measure the transition energy $\gamma_{t}$ of the isochronously tuned storage ring

Author

Chen, R. J., Yan, X. L., Ge, W. W., Yuan, Y. J., Wang, M., Sun, M. Z., Xing, Y. M., Zhang, P., Fu, C. Y., Shuai, P., Xu, X., Zhang, Y. H., Bao, T., Chen, X. C., Hu, X. J., Huang, W. J., Li, H. F., Liu, J. H., Litvinov, Yu. A., Litvinov, S. A., Mao, L. J., Wu, B., Xu, H. S., Yang, J. C., Yin, D. Y., Zeng, Q., Zhang, X. H., Zheng, W. H., Zhou, X. H., and Zhou, X.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The Isochronous Mass Spectrometry (IMS) is a powerful technique developed in heavy-ion storage rings for measuring masses of very short-lived exotic nuclei. The IMS is based on the isochronous setting of the ring. One of the main parameters of this setting is the transition energy $\gamma_{t}$. %The transition energy $\gamma_{t}$ plays an important role in the isochronous mass spectrometry (IMS). It has been a challenge to determine the $\gamma_{t}$ and especially to monitor the variation of $\gamma_{t}$ during experiments. In this paper we introduce a method to measure the $\gamma_{t}$ online during IMS experiments by using the acquired experimental data. Furthermore, since the storage ring has (in our context) a relatively large momentum acceptance, the variation of the $\gamma_{t}$ across the ring acceptance is a source of systematic uncertainty of measured masses. With the installation of two time-of-flight (TOF) detectors, the velocity of each stored ion and its revolution time are simultaneously available for the analysis. These quantities enabled us to determine the $\gamma_{t}$ as a function of orbital length in the ring. The presented method is especially important for future IMS experiments planned at the new-generation storage ring facilities FAIR in Germany and HIAF in China., Comment: 7 pages

Published
2018
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6. First application of combined isochronous and Schottky mass spectrometry: Half-lives of fully ionized 49Cr24+ and 53Fe26+ atoms

Author

Tu, X. L., Chen, X. C., Zhang, J. T., Shuai, P., Yue, K., Xu, X., Fu, C. Y., Zeng, Q., Zhou, X., Xing, Y. M., Wu, J. X., Mao, R. S., Mao, L. J., Fang, K. H., Sun, Z. Y., Wang, M., Yang, J. C., Litvinov, Yu. A., Blaum, K., Zhang, Y. H., Yuan, Y. J., Ma, X. W., Zhou, X. H., and Xu, H. S.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

Lifetime measurements of b -decaying highly charged ions have been performed in the storage ring CSRe by applying the isochronous Schottky mass spectrometry. The fully ionized 49Cr and 53Fe ions were produced in projectile fragmentation of 58Ni primary beam and were stored in the CSRe tuned into the isochronous ion-optical mode. The new resonant Schottky detector was applied to monitor the intensities of stored uncooled 49Cr24+ and 53Fe26+ ions. The extracted half-lives T1/2(49Cr24+) = 44.0(27) min and T1/2(53Fe26+) = 8.47(19) min are in excellent agreement with the literature half-life values corrected for the disabled electron capture branchings. This is an important proof-of-principle step towards realizing the simultaneous mass and lifetime measurements on exotic nuclei at the future storage ring facilities.

Published
2018
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8. Test of detuning system for dielectronic recombination experiment at CSRm

Author

Meng, L. J., Ma, X., Parkhomchuk, V. V., Yang, D., Reva, V. B., Li, J., Mao, L. J., Ma, X. M., Yan, T. L., Xia, J. W., Yuan, Y. J., Xu, H. S., Yang, J. C., and Xiao, G. Q.

Subjects
Physics - Accelerator Physics, High Energy Physics - Experiment
Abstract

The storage ring equipped with an electron cooler is an ideal platform for dielectronic recombination (DR) experiments. In order to fulfil the requirement of DR measurements at the main Cooler Storage Ring, a detuning system for the precision control of the relative energy between the ion beam and the electron beam has been installed on the electron cooler device. The test run using 7.0 MeV/u C6+ beam was performed to examine the influence of this system on the performance of the stored ion beam. The Schottky spectra and the ion beam currents were recorded to monitor the beam status. The influence of pulse heights and widths of the detuning voltage on the ion beam was investigated. For the small pulse height, the experimental results from the Schottky spectrum were in good agreement with the theoretical results. The frequency shift in the Schottky spectrum is significantly reduced for the short pulse width. For the large pulse height, an oscillation phenomenon was observed. From the Schottky spectrum, we found the oscillation amplitude is dependent on the pulse width of detuning and the ion beam intensity. The detailed description of the phenomenon and the theoretical model based on the plasma oscillation was discussed in this paper., Comment: contributed to Chinese Physics C

Published
2012
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9. Efficient photocatalytic degradation of tetracycline hydrochloride by Cu2O/BiVO4 p-n heterostructure.

Author

Wang, J. X., Mao, L. J., Duan, Y. J., Lei, K., Zeng, X. H., Sun, Y., and Li, T.

Subjects
*PHOTODEGRADATION, *X-ray powder diffraction, *P-N heterojunctions, *TETRACYCLINE, *X-ray photoelectron spectroscopy, *CHARGE transfer
Abstract

Star-like BiVO4 and Cu2O nanocubes were prepared by hydrothermal method and chemical reduction, respectively, and Cu2O/BiVO4 p-n heterojunction with different mass ratios of Cu2O to BiVO4 (3:1, 1:1, 1:3) were synthesized via facile physical mixing. The as-synthesized samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), UV-vis diffuse reflection spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS). The photocatalytic performance of the Cu2O/BiVO4 composites was evaluated by degradation of tetracycline hydrochloride (TC) under simulated solar illumination. Owing to the fast charge transfer between n-type BiVO4 and p-type Cu2O, Cu2O/BiVO4 composites exhibited superior photocatalytic activity. When the mass ratio of Cu2O to BiVO4 was 1:3, the highest degradation efficiency of TC reached 78.9% within 24 min. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Erosion Wear Characteristics and Failure Mechanism of the Sulzer Oil Pump.

Author

Qiao, L. F., Mo, L., Mao, L. J., Zhu, J. L., and Zeng, L. X.

Subjects
OIL well pumps, EROSION, FRETTING corrosion, SCANNING electron microscopes, SEALS (Closures), TURBULENT flow
Abstract

In the routine maintenance of each main pump in the oil transmission station plant, abnormal erosion wear was found at the flushing port of the mechanical seal of Sulzer pump casing. For the sake of stable and safe unit operation, this study explored the mechanism and process of erosion formation in the pump casing at the microscopic level using SEM (scanning electron microscope) and EDS (energy dispersive spectrometer) techniques. And ANSYS Fluent was used to numerically simulate the unconventional turbulent flow in the special location of Sulzer pump to obtain its flow field characteristics. The trajectory tracking of solid phase particles based on Finnie erosion model was also carried out to obtain the influence law of different particle sizes on the wear degree of each area of the pump casing, and to point out the influence of the motion behavior of particles at the flushing port position on the erosion. The results show that there is unconventional turbulence in the flushing port of the Sulzer pump mechanical seal, and the solid particles are affected by turbulent diffusion and fluid adhesion, and some particles deviate from the velocity direction and continuously impact the surface of the pump casing, which is the direct cause of the erosion wear here. By optimizing the location of the flushing port, severe erosion wear at the flushing port can be avoided. This study can provide guidance and recommendations for the production, operational stability and wear protection of Sulzer pumps. [ABSTRACT FROM AUTHOR]

Published
2024
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11. The expression of UNC5D is abnormal in the early stage of colorectal tumors associated with its proliferation and migration.

Author

SHI, L.-P., ZOU, C., MAO, L.-J., CHEN, T.-T., and XIE, T.

Abstract

OBJECTIVE: Colorectal adenomas are an important precancerous lesion of colorectal adenoma with a high incidence. This study aims to explore new prognostic targets for colorectal adenomas through bioinformatics techniques. MATERIALS AND METHODS: In this study, data from 29 colonic adenomas and 38 normal colonic mucosa in GSE37364 were analyzed to screen for differentially expressed genes (DEGs). Then, batch survival analysis, construction of risk model, mutation analysis, Cox regression analysis and expression analysis were performed on DEGs to determine the hub genes of this study. Finally, immune correlation analysis and cell experiments were carried out on the hub gene to explore its potential mechanism. RESULTS: In our study, a total of 431 up-regulated and 809 down-regulated differentially expressed genes (DEGs) were identified. Among these, Unc-5 Netrin Receptor D (UNC5D) emerged as a pivotal gene associated with colorectal adenoma. Notably, UNC5D expression levels were found to be significantly higher in normal tissues compared to colorectal adenoma tissues. Furthermore, our analysis demonstrated that UNC5D showed promising diagnostic potential for patients with colon adenocarcinoma. In vitro experiments revealed that the overexpression of UNC5D had a profound impact on the behavior of colorectal tumor cells. Specifically, it led to a substantial reduction in the proliferation, motility, and invasion of these tumor cells. Additionally, UNC5D was shown to exert control over STAT1/STAT3 phosphorylation, which in turn regulated the expression of PD-L1 in response to interferon (IFN) stimulation. These findings highlight the significant role of UNC5D in modulating immune responses and the development of colorectal adenoma. UNC5D emerges as a potential diagnostic biomarker and an attractive immunotherapeutic target in the context of colorectal malignancies. These results call for further exploration of UNC5D-based strategies for the diagnosis and treatment of colorectal adenoma and adenocarcinoma. CONCLUSIONS: In addition to having the potential to be used as a diagnostic biomarker and an immunotherapeutic target in colorectal malignancies, UNC5D is necessary for the growth of colorectal adenomas. Additionally, UNC5D controlled STAT1/STAT3 phosphorylation to suppress the growth of colorectal cancers by regulating IFN-induced PD-L1 expression. [ABSTRACT FROM AUTHOR]

Published
2024

13. Bunch beam cooling

Author

Bryzgunov, M. I., Kamerdzhiev, V., Li, J., Mao, L. J., Parkhomchuk, V. V., Reva, V. B., Yang, X. D., and Zhao, H.

Published
2017
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14. Determination of the 2s22p5−2s2p6 transition energy in fluorine-like nickel utilizing a low-lying dielectronic resonance

Author

Wang, S. X., primary, Huang, Z. K., additional, Wen, W. Q., additional, Ma, W. L., additional, Wang, H. B., additional, Schippers, S., additional, Wu, Z. W., additional, Kozhedub, Y. S., additional, Kaygorodov, M. Y., additional, Volotka, A. V., additional, Wang, K., additional, Zhang, C. Y., additional, Chen, C. Y., additional, Liu, C., additional, Huang, H. K., additional, Shao, L., additional, Mao, L. J., additional, Ma, X. M., additional, Li, J., additional, Tang, M. T., additional, Yan, K. M., additional, Zhou, Y. B., additional, Yuan, Y. J., additional, Yang, J. C., additional, Zhang, S. F., additional, Ma, X., additional, and Zhu, L. F., additional

Published
2022
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18. Demonstration of electron cooling using a pulsed beam from an electrostatic electron cooler

Author

Bruker, M. W., primary, Benson, S., additional, Hutton, A., additional, Jordan, K., additional, Powers, T., additional, Rimmer, R., additional, Satogata, T., additional, Sy, A., additional, Wang, H., additional, Wang, S., additional, Zhang, H., additional, Zhang, Y., additional, Ma, F., additional, Li, J., additional, Ma, X. M., additional, Mao, L. J., additional, Sha, X. P., additional, Tang, M. T., additional, Yang, J. C., additional, Yang, X. D., additional, Zhao, H., additional, and Zhao, H. W., additional

Published
2021
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19. Absolute rate coefficients for dielectronic recombination of Na-like Kr25+

Author

Huang, Z. K., primary, Wen, W. Q., additional, Wang, S. X., additional, Khan, N., additional, Wang, H. B., additional, Chen, C. Y., additional, Zhang, C. Y., additional, Preval, S. P., additional, Badnell, N. R., additional, Ma, W. L., additional, Liu, X., additional, Chen, D. Y., additional, Zhu, X. L., additional, Zhao, D. M., additional, Mao, L. J., additional, Ma, X. M., additional, Li, J., additional, Tang, M. T., additional, Mao, R. S., additional, Yin, D. Y., additional, Yang, W. Q., additional, Yang, J. C., additional, Yuan, Y. J., additional, Zhu, L. F., additional, and Ma, X., additional

Published
2020
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20. Rate Coefficients for Dielectronic Recombination of Carbon-like 40Ca14+

Author

Wen, W. Q., primary, Huang, Z. K., additional, Wang, S. X., additional, Khan, N., additional, Wang, H. B., additional, Chen, C. Y., additional, Zhang, C. Y., additional, Preval, S., additional, Badnell, N. R., additional, Ma, W. L., additional, Chen, D. Y., additional, Liu, X., additional, Zhao, D. M., additional, Mao, L. J., additional, Li, J., additional, Ma, X. M., additional, Tang, M. T., additional, Yin, D. Y., additional, Yang, W. Q., additional, Yuan, Y. J., additional, Yang, J. C., additional, Zhu, L. F., additional, and Ma, X., additional

Published
2020
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23. Electron-ion recombination rate coefficients of carbon-like Ar12+

Author

Mahmood, S, primary, Huang, Z K, additional, Wen, W Q, additional, Wang, S X, additional, Chen, C Y, additional, Khan, N, additional, Xu, X, additional, Dou, L J, additional, Wang, H B, additional, Zhu, X L., additional, Zhao, D M, additional, Mao, L J, additional, Ma, X M, additional, Li, J, additional, Tang, M T, additional, Mao, R S, additional, Yang, W Q, additional, Yin, D Y, additional, Yuan, Y J, additional, Yang, J C, additional, Zhu, L F, additional, and Ma, X, additional

Published
2020
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24. Atomic physics research at HIAF and future perspective

Author

Ma, X, primary, Wen, W Q, additional, Zhan, S F, additional, Huang, Z K, additional, Wang, H B, additional, Yang, J, additional, Zhu, X L, additional, Yu, D Y, additional, Cheng, R, additional, Mao, L J, additional, Yang, J C, additional, Sheng, L N, additional, Zhou, X H, additional, Xu, H S, additional, Yuan, Y J, additional, Xia, J W, additional, Zhao, H W, additional, Xiao, G Q, additional, and Zhan, W L, additional

Published
2020
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25. Present status of HIRFL complex in Lanzhou

Author

Yuan, Y J, primary, Gao, D Q, additional, Ma, L Z, additional, Mao, L J, additional, Mao, R S, additional, Meng, J, additional, Su, Y W, additional, Sun, L T, additional, Wang, Y Y, additional, Wu, J X, additional, Xu, Z, additional, Yang, J C, additional, Yang, W Q, additional, Yao, Q G, additional, Yin, X J, additional, Zhang, B, additional, Zhang, W, additional, Zhou, Z Z, additional, Zhao, H W, additional, Xiao, G Q, additional, and Xia, J W, additional

Published
2020
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26. Dielectronic recombination rate coefficients for F-like nickel

Author

Wang, S X, primary, Huang, Z K, additional, Wen, W Q, additional, Wang, H B, additional, Xu, X, additional, Schippers, S, additional, Khan, N, additional, Dou, L J, additional, Mahmood, S, additional, Mao, L J, additional, Ma, X M, additional, Li, J, additional, Tang, M T, additional, Yin, D Y, additional, Yuan, Y J, additional, Yang, J C, additional, Chen, C Y, additional, Shi, Y L, additional, Dong, C Z, additional, Ma, X, additional, and Zhu, L F, additional

Published
2020
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28. Rate Coefficients for Dielectronic Recombination of Carbon-like 40Ca14+.

Author

Wen, W. Q., Huang, Z. K., Wang, S. X., Khan, N., Wang, H. B., Chen, C. Y., Zhang, C. Y., Preval, S., Badnell, N. R., Ma, W. L., Chen, D. Y., Liu, X., Zhao, D. M., Mao, L. J., Li, J., Ma, X. M., Tang, M. T., Yin, D. Y., Yang, W. Q., and Yuan, Y. J.

Subjects
ION recombination, DELOCALIZATION energy, STORAGE rings, LOW temperatures, PLASMA temperature, CALCIUM ions
Abstract

Dielectronic recombination (DR) rate coefficients for carbon-like 40Ca14+ forming nitrogen-like 40Ca13+ have been measured using the electron–ion merged-beam technique at the heavy-ion storage ring CSRm at the Institute of Modern Physics in Lanzhou, China. The measured DR rate coefficients in the energy range from 0 to 92 eV cover most of the DR resonances associated with 2s22p2 → 2s22p2 and 2s22p2 → 2s2p3 core transitions (ΔN = 0). Theoretical calculations of the DR cross sections were carried out by using two different state-of-the-art atomic theoretical techniques, multiconfiguration Breit–Pauli (MCBP) code AUTOSTRUCTURE and relativistic configuration interaction code FAC, to compare with the experimental rate coefficients. The theoretical calculations agree with the experimental results at collision energy higher than 10 eV. However, significant discrepancies of resonance energies and strengths can be found at collision energy below 8 eV. Temperature-dependent plasma recombination rate coefficients were derived from the measured DR rate coefficients in the energy range from 0.1 to 1000 eV and compared with the recommended atomic data from the literature. The theoretical data of Gu et al. and Zatsarinny et al. are 30% lower than the experimental results at the temperatures of photoionized plasmas, but have a very good agreement at the temperatures of collisionally ionized plasmas. Other previously published theoretical data of Jacobs et al. and Mazzotta et al. by using Burgess formula and LS-coupling calculations significantly underestimate the plasma rate coefficients in the low temperature range. The present results comprise a set of benchmark data suitable for astrophysical modeling. [ABSTRACT FROM AUTHOR]

Published
2020
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29. Measurement of the lifetime and the proportion of 12C3+ ions in stored relativistic ion beams as a preparation for laser cooling experiments at the CSRe

Author

Wang, H. B., Wen, W. Q., Huang, Z. K., Zhang, D. C., Hai, B., Zhu, X. L., Zhao, D. M., Yang, J., Li, J., Li, X. N., Mao, L. J., Mao, R. S., Wu, J. X., Yang, J. C., Yuan, Y. J., Eidam, L., Winters, D., Beck, T., Kiefer, D., Rein, B., Walther, T., Loeser, M., Schramm, U., Siebold, M., Bussmann, M., and Ma, X.

Subjects
Laser cooling, Electron cooling, Schottky pick-up, dynamics, Storage ring, bunched beam
Abstract

We report on an experiment that was conducted in preparation of laser cooling experiments at the heavy-ion storage ring CSRe. The lifetimes of ion beams made up of 12C3+ and 16O4+ ions stored at an energy of 122MeV/u in the CSRe were determined by two independent methods, firstly via a DC current transformer (DCCT) and secondly via a Schottky resonator. Using electron-cooling, the signals of the 12C3+ and 16O4+ ions could be separated and clearly observed in the Schottky spectrum. The obtained individual lifetimes of the 12C3+ and 16O4+ components were 23.6s and 17.8s, respectively. The proportion of 12C3+ ions in the stored ion beam was measured to be more than 70% at the beginning of the injection and increasing as a function of time. In addition to these measurements, the operation and remote control of a pulsed laser system placed directly next to the storage ring was tested in a setup similar to the one envisaged for future laser experiments.

Published
2017

30. Potential correlation between EDN1 gene polymorphisms with preeclampsia.

Author

LI, J., YIN, W., LIU, M.-S., MAO, L.-J., and WANG, X.-H.

Abstract

OBJECTIVE: To explore the potential correlation between endothelin 1 (EDN1) gene polymorphisms with preeclampsia (PE). PATIENTS AND METHODS: The single nucleotide polymorphisms (SNPs) of 248 PE patients and 232 healthy controls were genotyped by Polymerase Chain Reaction (PCR). The possible association between EDN1 polymorphisms and PE was revealed through the t-test and the Chisquare test. RESULTS: PE risk was significantly correlated with the C allele of polymorphism rs5370 in EDN1. The polymorphism rs5370 in EDN1 was remarkably associated with the onset of severe PE, rather than mild PE. The markedly increased risk of early-onset PE was related to the C allele of polymorphism rs5370 in EDN1, while no significant difference in the allele frequency of polymorphism rs1800541 was detected between the PE group and the control group. In the co-dominant model, the CC genotype of polymorphism rs5370 in EDN1 was associated with the increased PE risk. PE risk in the population carrying TC genotype was 1.59 times higher than those with TT/CC genotype, while polymorphism rs1800541 had no apparent association with PE risk. In the severe PE group, there was an evident difference in the genotype frequency between the dominant and over-dominant models of polymorphism rs5370. In the recessive model, the raised risk of early-onset PE was notably correlated with the TT/CC genotype compared with that of TT genotype. However, no evident association with the genotype frequency of polymorphism rs1800541 was observed between PE patients and controls. CONCLUSIONS: EDN1 gene polymorphism rs5370 is correlated with the increased risk of PE. [ABSTRACT FROM AUTHOR]

Published
2020

31. Electron–ion Recombination Rate Coefficients of Be-like 40Ca16+

Author

Wang, S. X., primary, Xu, X., additional, Huang, Z. K., additional, Wen, W. Q., additional, Wang, H. B., additional, Khan, N., additional, Preval, S. P., additional, Badnell, N. R., additional, Schippers, S., additional, Mahmood, S., additional, Dou, L. J., additional, Chuai, X. Y., additional, Zhao, D. M., additional, Zhu, X. L., additional, Mao, L. J., additional, Ma, X. M., additional, Li, J., additional, Mao, R. S., additional, Yuan, Y. J., additional, Tang, M. T., additional, Yin, D. Y., additional, Yang, J. C., additional, Ma, X., additional, and Zhu, L. F., additional

Published
2018
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32. Dielectronic and Trielectronic Recombination Rate Coefficients of Be-like Ar 14+

Author

Huang, Z. K., primary, Wen, W. Q., additional, Xu, X., additional, Mahmood, S., additional, Wang, S. X., additional, Wang, H. B., additional, Dou, L. J., additional, Khan, N., additional, Badnell, N. R., additional, Preval, S. P., additional, Schippers, S., additional, Xu, T. H., additional, Yang, Y., additional, Yao, K., additional, Xu, W. Q., additional, Chuai, X. Y., additional, Zhu, X. L., additional, Zhao, D. M., additional, Mao, L. J., additional, Ma, X. M., additional, Li, J., additional, Mao, R. S., additional, Yuan, Y. J., additional, Wu, B., additional, Sheng, L. N., additional, Yang, J. C., additional, Xu, H. S., additional, Zhu, L. F., additional, and Ma, X., additional

Published
2018
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33. First application of combined isochronous and Schottky mass spectrometry: Half-lives of fully ionized Cr24+49 and Fe26+53 atoms

Author

Tu, X. L., primary, Chen, X. C., additional, Zhang, J. T., additional, Shuai, P., additional, Yue, K., additional, Xu, X., additional, Fu, C. Y., additional, Zeng, Q., additional, Zhou, X., additional, Xing, Y. M., additional, Wu, J. X., additional, Mao, R. S., additional, Mao, L. J., additional, Fang, K. H., additional, Sun, Z. Y., additional, Wang, M., additional, Yang, J. C., additional, Litvinov, Yu. A., additional, Blaum, K., additional, Zhang, Y. H., additional, Yuan, Y. J., additional, Ma, X. W., additional, Zhou, X. H., additional, and Xu, H. S., additional

Published
2018
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34. Dielectronic recombination of Be-like argon at the CSRm

Author

Huang, Z K, primary, Wen, W Q, additional, Xu, X, additional, Wang, S X, additional, Wang, H B, additional, Dou, L J, additional, Mahmood, S, additional, Khan, N, additional, Xu, W Q, additional, Xu, T H, additional, Yao, K, additional, Chuai, X Y, additional, Zhu, X L, additional, Zhao, D M, additional, Mao, L J, additional, Yang, J C, additional, Yuan, Y J, additional, Zhu, L F., additional, and Ma, X, additional

Published
2017
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35. Frontiers of atomic physics with highly charged heavy ions at HIAF

Author

Ma, X., primary, Wen, W. Q., additional, Zhang, S. F, additional, Huang, Z. K., additional, Wang, H. B., additional, Yang, J., additional, Zhu, X. L., additional, Yu, D. Y., additional, Cheng, R., additional, Cai, X., additional, Mao, L. J., additional, Yang, J. C., additional, Sheng, L. N., additional, Wu, B., additional, Zhou, X. H., additional, Xu, H. S., additional, Yuan, Y. J., additional, Xia, J. W., additional, Zhao, H. W., additional, Xiao, G. Q, additional, and Zhan, W. L, additional

Published
2017
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36. RF-bunching of relativistic 12 C 3+ ion beam for laser cooling experiment at the CSRe

Author

Wang, H. B., Wen, W. Q., Ma, X., Huang, Z. K., Zhang, D. C., Bussmann, M., Winters, D. F. A., Yuan, Y. J., Zhu, X. L., Zhao, D. M., Mao, R. S., Li, J., Mao, L. J., Yang, J. C., Zhao, H. W., Xu, H. S., Xiao, G. Q., and Xia, J. W.

Subjects
rf bunching, relativistic, ion beam, Physics::Accelerator Physics, storage ring, dynamics
Abstract

To prepare the upcoming experiment of laser cooling of relativistic 12 C 3+ ion beams at the experimental cooler storage ring (CSRe), a test experiment was performed with 12 C 3+ ion beams at an energy of 122 MeV/u on the CSRe, at the Institute of Modern Physics, Lanzhou, China. In this experiment, the main storage ring of CSRm was employed to accumulate and accelerate the ion beam which was injected into the CSRe for the experiments. The number of 12 C 3+ ions at the CSRe reached 5×10 8 for every injection, which satisfied the experimental requirement. To fulfil the laser cooling experiment, the 12 C 3+ ion beams were bunched by sinusoidal waveforms with fixed and sweeping frequencies, respectively. A resonant Schottky pick-up was employed to record the Schottky spectra of these ion beams. The test experimental results demonstrated that the RF-buncher and diagnostic systems at the CSRe worked well and the CSRe was very stable with 12 C 3+ ion beams, hereby the CSRe is suitable for laser cooling experiment.

Published
2015

37. Recent progress on laser cooling of relativistic Lithium-like 12C3+ ion beams at heavy ion storage ring CSRe

Author

Wen, W. Q., Wang, H. B., Huang, Z. K., Zhang, D. C., Hai, B., Zhu, X. L., Chuai, X. Y., Zhao, D. M., Yang, J., Li, J., Li, X. N., Mao, L. J., Mao, R. S., Wu, J. X., Xia, J. W., Yang, J. C., Yuan, Y. J., Zhao, H. W., Zhao, T. C., Eidam, L., Loeser, M., Rein, B., Siebold, M., Winters, D., (0000-0002-8258-3881) Bussmann, M., Ma, X. W., Wen, W. Q., Wang, H. B., Huang, Z. K., Zhang, D. C., Hai, B., Zhu, X. L., Chuai, X. Y., Zhao, D. M., Yang, J., Li, J., Li, X. N., Mao, L. J., Mao, R. S., Wu, J. X., Xia, J. W., Yang, J. C., Yuan, Y. J., Zhao, H. W., Zhao, T. C., Eidam, L., Loeser, M., Rein, B., Siebold, M., Winters, D., (0000-0002-8258-3881) Bussmann, M., and Ma, X. W.

Abstract

aser cooling of relativistic heavy ion beams at storage rings is one of the most promising techniques to reach high phase-space densities and achieve phase transition, ordered beam even crystalline beam. Compared with the established cooling schemes at storage rings, such as stochastic cooling and electron cooling, laser cooling has many advantages such as fast-cooling, ultra-strong cooling force and providing an ultra-low temperature(m K) ion beams. In addition, the precision laser spectroscopy of the highly charged ions can be performed by using the laser-cooled ion beams during the laser cooling experiments. We introduce the experimental principal and methods of laser cooling of relativistic ion beams at the experimental cooler storage ring of the CSRe at the Institute of Modern Phyics, Chinese Academy of Sciences. The first experimental results from a beam time aiming for laser cooling of 122 Me V/u Li-like 12C3+ at the CSRe with a pulsed laser are presented, and laser cooling and precision laser spectroscopy of relativistic Li-like and Na-like highly charged ions at the future large facility HIAF and FAIR are outlined.

Published
2016

38. Study of dielectronic recombination at the CSRm using lithium-like Ar15+ions

Author

Huang, Z K, primary, Wen, W Q, additional, Wang, H B, additional, Xu, X, additional, Zhu, L F, additional, Chuai, X Y, additional, Yuan, Y J, additional, Zhu, X L, additional, Han, X Y, additional, Mao, L J, additional, Li, J, additional, Ma, X M, additional, Yan, T L, additional, Yang, J C, additional, Xiao, G Q, additional, Xia, J W, additional, and Ma, X, additional

Published
2015
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40. RF-bunching of relativistic12C3+ion beam for laser cooling experiment at the CSRe

Author

Wang, H B, primary, Wen, W Q, additional, Ma, X, additional, Huang, Z K, additional, Zhang, D C, additional, Bussmann, M, additional, Winters, D F A, additional, Yuan, Y J, additional, Zhu, X L, additional, Zhao, D M, additional, Mao, R S, additional, Li, J, additional, Mao, L J, additional, Yang, J C, additional, Zhao, H W, additional, Xu, H S, additional, Xiao, G Q, additional, and Xia, J W, additional

Published
2015
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41. Effect of exercise combined with dietary intervention on obese children and adolescents associated with the FTO rs9939609 polymorphism.

Author

ZOU, Z.-C., MAO, L.-J., SHI, Y.-Y., CHEN, J.-H., WANG, L.-S., and CAI, W.

Abstract

OBJECTIVE: Aim of this study was to investigate the association of the FTO rs9939609 polymorphism with the effects of the exercise and dietary intervention on obese adolescents and children in China. PATIENTS AND METHODS: Total 138 chinese children and adolescents (77 males and 61 females, aged 10-18 years) were recruited in the 2012 summer camp in Shanghai. Dietary and exercise intervention was performed for four weeks. Obesity related parameters were detected by the physical examination before and after four-week's intervention. Genotyping of the FTO rs9939609 was performed by using a TaqMan SNP Genotyping Assay. SPSS 19.0 were used to do the statistical analysis. RESULTS: Finally, 135 campers were investigated in this study. The AA, AT and TT genotype frequencies of rs9939609 were 5.2%, 33.3% and 61.5%, respectively. The BMI in individuals with the genotype AA (or AT) was significantly higher compared with their with TT genotype (p = 0.044). The levels of body mass index (BMI), insulin (INS), total cholesterol (TC), triglyceride (TG), high-density lipoprotein (HDL), red blood cell (RBC), Hemoglobin (HB) and hematocrit (HCT) in campers were significantly declined by the combined intervention (p < 0.05). Moreover, the levels of TC, low-density lipoprotein (LDL), RBC, HB, and HCT in the camper with genotype AA (or AT) were significantly decreased by the combined intervention compared with the camper with genotype TT (p < 0.05). CONCLUSIONS: The effects of exercise combined with dietary intervention on obesity were associated with the FTO rs9939609 polymorphism in chinese adolescents and children. [ABSTRACT FROM AUTHOR]

Published
2015

42. Progress of dielectronic recombination experiment at CSRm

Author

Meng, L J, primary, Ma, X, additional, Yang, X D, additional, Xu, H S, additional, Xia, J W, additional, Yuan, Y J, additional, Yang, J C, additional, Zhu, X L, additional, Mao, L J, additional, Li, J, additional, Ma, X M, additional, Yan, T L, additional, Qian, D B, additional, Xiao, G Q, additional, Parkhomchuk, V V, additional, and Reva, V B, additional

Published
2012
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45. News from the CSR storage ring

Author

Ma, X, primary, Xu, H S, additional, Xia, J W, additional, Yang, X D, additional, Meng, L J, additional, Wang, M, additional, Tu, X L, additional, Liu, H P, additional, Hu, Z G, additional, Zhu, X L, additional, Mao, R S, additional, Zhang, D C, additional, Mao, L J, additional, Li, J, additional, Li, G H, additional, Liu, Y, additional, Yang, J C, additional, Yuan, Y J, additional, Cai, X H, additional, Zheng, J H, additional, Yang, X T, additional, Xiao, G Q, additional, and Zhan, W L, additional

Published
2009
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47. The first test experiment performed at the electron cooler of storage rings in Lanzhou

Author

Meng, L J, primary, Ma, X, additional, Liu, H P, additional, Yang, X D, additional, Xia, J W, additional, Xu, H S, additional, Hu, Z G, additional, Zhu, X L, additional, Wang, M, additional, Mao, R S, additional, Zhang, D C, additional, Mao, L J, additional, Li, J, additional, Li, G H, additional, Liu, Y, additional, Yang, J C, additional, Yuan, Y J, additional, Zheng, J H, additional, Yang, X T, additional, Xiao, G Q, additional, and Zhan, W L, additional

Published
2009
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48. FIRST ISOCHRONOUS MASS MEASUREMENTS AT CSRe

Author

Wang, M., primary, Xu, H. S., additional, Xia, J. W., additional, Tu, X. L., additional, Mao, R. S., additional, Yuan, Y. J., additional, Hu, Z. G., additional, Liu, Y., additional, Zhang, H. B., additional, Zang, Y. D., additional, Zhao, T. C., additional, Zhang, X. Y., additional, Fu, F., additional, Yang, J. C., additional, Mao, L. J., additional, Xiao, C., additional, Xiao, G. Q., additional, Zhao, H. W., additional, and Zhan, W. L., additional

Published
2009
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