COOL2017 - List of Authors (Yang, J.C.)

Paper	Title	Page
TUP05	Towards Laser Cooling of Relativistic ¹⁶O⁵⁺ Ion Beams at the CSRe
	H.B. Wang, B. Hai, Z. Huang, J. Li, X.N. Li, X. Ma, L.J. Mao, R.S. Mao, W.Q. Wen, J.X. Wu, J.C. Yang, Y.J. Yuan, D. Zhang, D. Zhao IMP/CAS, Lanzhou, People's Republic of China M.H. Bussmann HZDR, Dresden, Germany D.F.A. Winters GSI, Darmstadt, Germany
	Laser cooling is one of the most promising techniques to achieve high phase-space densities or even crystalline beams for relativistic heavy ion beams at storage rings []. In addition, precision laser spectroscopy of relevant transitions in highly charged ions can also be performed simultaneously during the laser cooling experiments []. In the storage ring CSRe at IMP, a new laser cooling experiment for Li-like ¹⁶O⁵⁺ ion beams is currently being prepared and will be carried out at the end of the year 2017 under the Laser-cooling Collaboration. During the experiment, a CW laser with a wavelength of 220 nm will be used to cool the ¹⁶O⁵⁺ ion beams with an energy of 280 MeV/u. The ¹⁶O⁵⁺ ion beams will be the highest charge state and highest energy ions ever used for laser cooling at the storage rings. In the experiment, the longitudinally dynamics of ultra-cold ion beams will be investigate systematically towards the transition of the space charge dominated regime. Precision laser spectroscopy of ¹⁶O⁵⁺ ions for measuring the transition energy of 2s1/2'2p1/2 and 2s1/2'2p3/2 is foreseen. [] U. Schramm et al., Progress in Particle and Nuclear Physics, 53 (2004) 583-677. [**] U. Schramm et al., Hyperfine Interactions 162(1) (2005), 181-188
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP08	Preliminary Design of Electron Target for SRing at HIAF	40
	J. Li, Z. Huang, L.J. Mao, M.T. Tang, S. X. Wang, J.C. Yang, X.D. Yang, H. Zhao, L.X. Zhao IMP/CAS, Lanzhou, People's Republic of China
	A 13 Tm multifunction storage ring dedicated to nucleon and atomic experiment research - the SRing (Spectrometry Ring) is a significant part of the new heavy-ion research complex - HIAF (High Intensity heavy ion Accelerator Facility). In additional to an electron cooler and a gas internal target planned at the SRing, a beam of low temperature electron is also required to collide with the storage beam and to cool the decelerated ion beam at low energy. A magnetic adiabatic expansion is proposed to attain a low temperature by applying a 1.2 T longitudinal magnetic field upon the thermionic cathode at the electron gun. In this paper, preliminary design of the electron target is introduced.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP08
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP12	Simulation of Low Enery Ion Beam Cooling With Pulsed Electron Beam on CSRm	50
	H. Zhao, J. Li, L.J. Mao, M.T. Tang, J.C. Yang, X.D. Yang IMP/CAS, Lanzhou, People's Republic of China
	The pulsed electron beam can be applied to high ener-gy beam cooling and the researches of ion-electron inter-action in the future. In this paper, we studied the pulsed e-beam cooling effects on coasting and bunched ion beam by simulation code which is based on the theory of elec-tron cooling, IBS and space charge effect etc. In the simu-lation, a rectangular distribution of electron beam was applied to 7 MeV/u 12C⁶⁺ ion beam on CSRm. It is found that the coasting ion beam was bunched by the pulsed e-beam and the rising and falling region of electron beam current play an important role for the bunching effect, and similar phenomenon was found for the bunched ion beam. In addition, the analyses of these phenomena in simulation were discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP12
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP15	Experimental Demonstration of Electron Cooling with Bunched Electron Beam	61
	L.J. Mao, J. Li, X.M. Ma, M.T. Tang, J.C. Yang, X.D. Yang, H. Zhao, H.W. Zhao IMP/CAS, Lanzhou, People's Republic of China A. Hutton, K. Jordan, T. Powers, R.A. Rimmer, M. Spata, H. Wang, S. Wang, H. Zhang, Y. Zhang JLab, Newport News, Virginia, USA
	Funding: This work was supported by the Hundred Talents Project of the Chinese Academy of Sciences and National Natural Science Foundation of China (Nos. 11575264, 11475235, 11375245) Electron cooling at high energy is presently considered for several ion colliders, in order to achieve high luminosities by enabling a significant reduction of emittance of hadron beams. Electron beam at cooling channel in a few to tens MeV can be accelerated by a RF/SRF linac, and thus using bunched electrons to cool bunched ions. To study such cooling process, the DC electron gun of EC35 cooler was modified by pulsing the grid voltage, by which a 0.5-3.5 us of electron bunch length with a repetition frequency of less than 250 kHz was obtained. The first experiment demonstrated cooling coasting and bunched ion beam by a bunched electron beam was carried out at the storage ring CSRm at IMP. A preliminary data analysis has indicted the bunch length shrinkage and the momentum spread reduction of bunched 12C+6 ion beam. A longitudinal grouping effect of coasting ion beam by the electron bunch has also observed. In this paper, we will present the experiment result and its preliminary comparison to the simulation modeling.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP15
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

TUP05

Towards Laser Cooling of Relativistic ¹⁶O⁵⁺ Ion Beams at the CSRe

H.B. Wang, B. Hai, Z. Huang, J. Li, X.N. Li, X. Ma, L.J. Mao, R.S. Mao, W.Q. Wen, J.X. Wu, J.C. Yang, Y.J. Yuan, D. Zhang, D. Zhao
IMP/CAS, Lanzhou, People's Republic of China
M.H. Bussmann
HZDR, Dresden, Germany
D.F.A. Winters
GSI, Darmstadt, Germany

Laser cooling is one of the most promising techniques to achieve high phase-space densities or even crystalline beams for relativistic heavy ion beams at storage rings [*]. In addition, precision laser spectroscopy of relevant transitions in highly charged ions can also be performed simultaneously during the laser cooling experiments [**]. In the storage ring CSRe at IMP, a new laser cooling experiment for Li-like ¹⁶O⁵⁺ ion beams is currently being prepared and will be carried out at the end of the year 2017 under the Laser-cooling Collaboration. During the experiment, a CW laser with a wavelength of 220 nm will be used to cool the ¹⁶O⁵⁺ ion beams with an energy of 280 MeV/u. The ¹⁶O⁵⁺ ion beams will be the highest charge state and highest energy ions ever used for laser cooling at the storage rings. In the experiment, the longitudinally dynamics of ultra-cold ion beams will be investigate systematically towards the transition of the space charge dominated regime. Precision laser spectroscopy of ¹⁶O⁵⁺ ions for measuring the transition energy of 2s1/2'2p1/2 and 2s1/2'2p3/2 is foreseen.
[*] U. Schramm et al., Progress in Particle and Nuclear Physics, 53 (2004) 583-677.
[**] U. Schramm et al., Hyperfine Interactions 162(1) (2005), 181-188

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP08

Preliminary Design of Electron Target for SRing at HIAF

40

J. Li, Z. Huang, L.J. Mao, M.T. Tang, S. X. Wang, J.C. Yang, X.D. Yang, H. Zhao, L.X. Zhao
IMP/CAS, Lanzhou, People's Republic of China

A 13 Tm multifunction storage ring dedicated to nucleon and atomic experiment research - the SRing (Spectrometry Ring) is a significant part of the new heavy-ion research complex - HIAF (High Intensity heavy ion Accelerator Facility). In additional to an electron cooler and a gas internal target planned at the SRing, a beam of low temperature electron is also required to collide with the storage beam and to cool the decelerated ion beam at low energy. A magnetic adiabatic expansion is proposed to attain a low temperature by applying a 1.2 T longitudinal magnetic field upon the thermionic cathode at the electron gun. In this paper, preliminary design of the electron target is introduced.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP08

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP12

Simulation of Low Enery Ion Beam Cooling With Pulsed Electron Beam on CSRm

50

H. Zhao, J. Li, L.J. Mao, M.T. Tang, J.C. Yang, X.D. Yang
IMP/CAS, Lanzhou, People's Republic of China

The pulsed electron beam can be applied to high ener-gy beam cooling and the researches of ion-electron inter-action in the future. In this paper, we studied the pulsed e-beam cooling effects on coasting and bunched ion beam by simulation code which is based on the theory of elec-tron cooling, IBS and space charge effect etc. In the simu-lation, a rectangular distribution of electron beam was applied to 7 MeV/u 12C⁶⁺ ion beam on CSRm. It is found that the coasting ion beam was bunched by the pulsed e-beam and the rising and falling region of electron beam current play an important role for the bunching effect, and similar phenomenon was found for the bunched ion beam. In addition, the analyses of these phenomena in simulation were discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP12

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP15

Experimental Demonstration of Electron Cooling with Bunched Electron Beam

61

L.J. Mao, J. Li, X.M. Ma, M.T. Tang, J.C. Yang, X.D. Yang, H. Zhao, H.W. Zhao
IMP/CAS, Lanzhou, People's Republic of China
A. Hutton, K. Jordan, T. Powers, R.A. Rimmer, M. Spata, H. Wang, S. Wang, H. Zhang, Y. Zhang
JLab, Newport News, Virginia, USA

Funding: This work was supported by the Hundred Talents Project of the Chinese Academy of Sciences and National Natural Science Foundation of China (Nos. 11575264, 11475235, 11375245)
Electron cooling at high energy is presently considered for several ion colliders, in order to achieve high luminosities by enabling a significant reduction of emittance of hadron beams. Electron beam at cooling channel in a few to tens MeV can be accelerated by a RF/SRF linac, and thus using bunched electrons to cool bunched ions. To study such cooling process, the DC electron gun of EC35 cooler was modified by pulsing the grid voltage, by which a 0.5-3.5 us of electron bunch length with a repetition frequency of less than 250 kHz was obtained. The first experiment demonstrated cooling coasting and bunched ion beam by a bunched electron beam was carried out at the storage ring CSRm at IMP. A preliminary data analysis has indicted the bunch length shrinkage and the momentum spread reduction of bunched 12C+6 ion beam. A longitudinal grouping effect of coasting ion beam by the electron bunch has also observed. In this paper, we will present the experiment result and its preliminary comparison to the simulation modeling.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2017-TUP15

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)