Author: Wu, J.X.
Paper Title Page
MOA01
 Dielectronic Recombination of Na-like Kr25+ at the Cooler Storage Ring CSRm  
 
  • Z. Huang, L.J. Dou, N. Khan, J. Li, X.M. Ma, X. Ma, L.J. Mao, R.S. Mao, M.T. Tang, H.B. Wang, W.Q. Wen, J.X. Wu, J.C. Yang, D.Y. Yin, Y.J. Yuan, D. Zhao, X. Zhu
    IMP/CAS, Lanzhou, People’s Republic of China
  • N.R. Badnell
    USTRAT/SUPA, Glasgow, United Kingdom
  • C.Y. Chen
    Fudan University, Shanghai, People’s Republic of China
  • W.L. Ma, S.X. Wang, L.F. Zhu
    USTC, Hefei, Anhui, People’s Republic of China
  • S. Preval
    University of Leicester, Department of Physics and Astronomy, Leicester, United Kingdom
  
  Funding: Partly supported by the National Key R&D Program of China, Grant N.2017YFA0402300, the National Natural Science Foundation of China, N.11320101003, 91336102, U1732133, 11611530684.
Based on the successful DR measurement of Be-like Ar14+* and Ca16+** at the cooler storage ring CSRm, the absolute electron-ion recombination rate coefficients for Na-like Kr25+ ions have been determined at the cooler storage ring CSRm at the Institute of Modern Physics in Lanzhou, China. In the electron-ion collision energy range 0-70 eV resonances due to 3s-3p,3d (DeltaN = 0) and 3s-4l (DeltaN = 1) core excitation were detected. The resonant energies and strengths were obtained by fitting to the spectrum with a anisotropic electron-energy distribution and compared to the calculated ones by using a relativistic configuration interaction flaxcible atomic code (FAC) and the distorted-wave collision package AUTOSTRUCTURE. The merged-beams recombination rate coefficients are then convolved with a Maxwellian-boltzmann distribution to obtain the temperature dependent plasma recombination rate coefficient (PRRC) within the temperature range 103-108 K.
*Z.K. Huang, W.Q. Wen, X. Xu, et al., Astrophys J Suppl S, 2018; 235, 2.
**S.X. Wang, X. Xu, Z.K. Huang, et al., The Astrophysical Journal, 2018; 862, 134.
 		 
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THY02
 Progress of Stochastic Cooling on SRing of HIAF  
 
  • J.X. Wu, Z. Du, X.J. Hu, G. Zhu
    IMP/CAS, Lanzhou, People’s Republic of China
  • F. Caspers, L. Thorndahl
    CERN, Meyrin, Switzerland
  
  We report on the preliminary design of Slot-ring and Faltin type pickups and kickers for stochastic pre-cooling of rare isotope beams from 400 MeV/u to 740 MeV/u (beta: 0.71-0.83), using a bandwidth of 0.6-1.2 Ghz for the Spectrometer ring (SRing) in the HIAF project at IMP. In this paper we present and discuss the shunt impedance data of both prototypes (Slot-ring and Faltin type) from measurements with beam on CSRm, as well as by numerical simulations. The simulated and measured results are in good agreement. Frequency domain simulations data for the SRing stochastic cooling systems are also presented in this paper.  
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TUPS16
 Laser Cooling of Relativistic Lithium-like 16O5+ Ion Beams at the CSRe  
 
  • H.B. Wang, B. Hai, Z. Huang, N. Khan, J. Li, X.N. Li, X. Ma, L.J. Mao, R.S. Mao, W.Q. Wen, J.X. Wu, J.C. Yang, D.Y. Yin, Y.J. Yuan, D. Zhao, T.C. Zhao, X. Zhu
    IMP/CAS, Lanzhou, People’s Republic of China
  • M.H. Bussmann
    HZDR, Dresden, Germany
  • D.Y. Chen, D. Zhang, H.Y. Zhang
    Xidian University, Xi’an, People’s Republic of China
  • D. Kiefer, S. Klammes, T. Walther
    TU Darmstadt, Darmstadt, Germany
  • S.A. Litvinov, D.F.A. Winters
    GSI, Darmstadt, Germany
  
  Funding: This work is supported by the NSFC No. U1732141 and 11504388, National Postdoctoral Program for Innovative Talents No. BX201700256, the Youth Innovation Promotion Association CAS.
Laser cooling of Li-like O5+ ion beams with an relativistic energy of 275.7 MeV/u was achieved for the first time at the heavy-ion storage ring CSRe in Lanzhou, China [*,**]. In the experiment, a CW la-ser system with a wavelength of 220 nm was used to interact with the closed 2s1/2-2p1/2 optical transi-tion of O5+ ions. In order to cool the relativistic ion beams with only one counter-propagating CW laser, the ion beams were bunched by applying a sinusoidal voltage to the RF-buncher system. The relative longitudinal momentum spread dp/p of laser-cooled ion beams reached 1×10-6. The O5+ ions are of the highest charge state and highest beam energy that have ever been cooled by laser cooling method. We will present the very recent experimental results on this COOL 2019 workshop. Based on this successful laser cooling experiment, the precision laser spectroscopy experiment of O5+ ions is in preparation at the CSRe. A new optical detector is under design and will be installed at the CSRe to measure the forward-emitted fluorescence by the laser-excited O5+ ions [***,****]. The high voltage of the electron cooler will be precisely calibrated to determine the beam energy. Precision laser spectroscopy of O5+ ions to measure the transition energy of 2s1/2-2p1/2 and 2s1/2-2p3/2 is foreseen, and the relative accuracy could reach 1×10-5.
*Wang H B, et al., in preparation
**Wen W Q, et al, 2019 Hyperfine Interact. 240 45
***Hannen V, et al., 2013 JINST 8 09018
****Winters D, et al., 2013 Phys. Scr. T156 014089
 		 
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TUPS19 Stochastic Cooling Simulation of Rare Isotope Beams on the Spectrometer Ring of the High Energy and High Intensity Accelerator Facility 123
 
  • X.J. Hu, J.X. Wu, Y.J. Yuan, G. Zhu
    IMP/CAS, Lanzhou, People’s Republic of China
  
  Among various cooling methods, stochastic cooling is an effective way of cooling low intensity beams with larger size. for the HIAF (High energy and high Intensity Accelerator Facility) project, stochastic cooling will be built on the SRing (Spectrometer Ring).this paper mainly concerns on cooling effect based on different stochastic cooling methods, aiming at finding the optimal cooling method and cooling parameters for different physical experiment purposes. simulation analysis will provide theoretical reference and support for the engineering construction.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2019-TUPS19  
About • paper received ※ 04 October 2019       paper accepted ※ 21 October 2019       issue date ※ 01 November 2019  
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