COOL2019 - List of Authors (Li, J.)

Paper

Title

Page

The Electron Cooling System for the HIAF Project in China

14

L.J. Mao, J. Li, H.J. Lu, X.M. Ma, M.T. Tang, X.D. Yang, L.X. Zhao, Y.B. Zhou
IMP/CAS, Lanzhou, People’s Republic of China

A classical 450keV magnetized electron cooling system is proposed to boost the luminosity of high-density internal targets experiment in the spectrometer ring at HIAF. Electron cooling will provide highest phase space density of the stored highly charged heavy ion beams and compensate beam heating during internal target experiments. In addition, it will be used to suppress the beam loss in the deceleration mode. In this paper, the technical design of the electron cooling system is reported. The manufacturing of the key components such as the electron gun and collector is described. The problems of the construction will be discussed.

Slides MOZ01 [13.308 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2019-MOZ01

About •

paper received ※ 23 September 2019 paper accepted ※ 18 October 2019 issue date ※ 01 November 2019

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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.

Slides MOA01 [6.897 MB]

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THB01

Design of an 80 keV Electron Target at the Spectrometry Ring

J. Li, Z. Huang, H.J. Lu, X.M. Ma, X. Ma, L.J. Mao, M.T. Tang, H.B. Wang, S.X. Wang, W.Q. Wen, K.M. Yan, J.C. Yang, X.D. Yang, Y.J. Yuan, H.W. Zhao, L.X. Zhao, Y.B. Zhou
IMP/CAS, Lanzhou, People’s Republic of China

An electron target with the maximum energy of 80 keV is designed for high precision measurement in dielectronic recombination experiment at the Spectrometry Ring at the High Intensity heavy ion Accelerator Facility.

Slides THB01 [7.532 MB]

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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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Paper	Title	Page
MOZ01	The Electron Cooling System for the HIAF Project in China	14
	L.J. Mao, J. Li, H.J. Lu, X.M. Ma, M.T. Tang, X.D. Yang, L.X. Zhao, Y.B. Zhou IMP/CAS, Lanzhou, People’s Republic of China
	A classical 450keV magnetized electron cooling system is proposed to boost the luminosity of high-density internal targets experiment in the spectrometer ring at HIAF. Electron cooling will provide highest phase space density of the stored highly charged heavy ion beams and compensate beam heating during internal target experiments. In addition, it will be used to suppress the beam loss in the deceleration mode. In this paper, the technical design of the electron cooling system is reported. The manufacturing of the key components such as the electron gun and collector is described. The problems of the construction will be discussed.
	Slides MOZ01 [13.308 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2019-MOZ01
About •	paper received ※ 23 September 2019 paper accepted ※ 18 October 2019 issue date ※ 01 November 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

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.
	Slides MOA01 [6.897 MB]
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THB01	Design of an 80 keV Electron Target at the Spectrometry Ring
	J. Li, Z. Huang, H.J. Lu, X.M. Ma, X. Ma, L.J. Mao, M.T. Tang, H.B. Wang, S.X. Wang, W.Q. Wen, K.M. Yan, J.C. Yang, X.D. Yang, Y.J. Yuan, H.W. Zhao, L.X. Zhao, Y.B. Zhou IMP/CAS, Lanzhou, People’s Republic of China
	An electron target with the maximum energy of 80 keV is designed for high precision measurement in dielectronic recombination experiment at the Spectrometry Ring at the High Intensity heavy ion Accelerator Facility.
	Slides THB01 [7.532 MB]
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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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