COOL2021 - List of Authors (Yang, J.C.)

Paper	Title	Page
P1001	Simulation of High Energy Proton Beam Cooling in EicC	66
	F. Ma, J. Li, X.M. Ma, L.J. Mao, X.P. Sha, M.T. Tang, J.C. Yang, X.D. Yang, H. Zhao, H.W. Zhao IMP/CAS, Lanzhou, People’s Republic of China
	The hadron beam cooling plays an important role in the future e-i collider machines to achieve various physical goals. In EicC, two-stage beam cooling scheme is proposed to maintain the luminosity during the long time collision. First, a traditional electron cooler will be used to pre-cool the low energy proton beam in the BRing. Then, an ERL-based electron cooler will be applied at the pRing to cool the proton beam at high energy. The main purpose of cooling is to counteract the emittance growth due to the IBS. In this paper, we focus on the high energy beam cooling and present some simulation studies on how the cooling rate will be affected by the electron bunch size, magnetic field, and ring parameters in the cooling section, which would be helpful for the cooler design.
	Poster P1001 [1.097 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2021-P1001
About •	paper received ※ 04 November 2021 paper accepted ※ 22 November 2021 issue date ※ 27 November 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

P1006	Design of the SRing Electron Target	78
	J. Li, Z. Huang, H.J. Lu, F. Ma, X.M. Ma, X. Ma, L.J. Mao, X.P. Sha, G.D. Shen, M.T. Tang, H.B. Wang, S.X. Wang, W.Q. Wen, T.L. Yan, J.C. Yang, X.D. Yang, L.X. Zhao, Y.B. Zhou IMP/CAS, Lanzhou, People’s Republic of China
	An electron target is proposed for high precision experimental measurement at the SRing (Spectrometry Ring) of HIAF (High Intensity heavy ion Accelerator Facility). It provides low temperature electron beam with a few meV for DR (Dielectronic Recombination) experiments at the energy of 1-§I{80}{keV}. For such a low temperature, the conventional method is adopted by magnetic adiabatic expansion with a factor of 30 after acceleration within 1.2T longitudinal magnetic field at gun section. In this paper, the design optimization of the electron target is introduced.
	Poster P1006 [3.085 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2021-P1006
About •	paper received ※ 04 November 2021 paper accepted ※ 22 November 2021 issue date ※ 10 December 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

P1008	Electron Cooling using a Pulsed and Dithering beam from an Electrostatic Electron Cooler	81
	M.W. Bruker, S.V. Benson, A. Hutton, K. Jordan, T. Powers, R.A. Rimmer, T. Satogata, A.V. Sy, H. Wang, S. Wang, H. Zhang, Y. Zhang JLab, Newport News, Virginia, USA J. Li, F. Ma, X.M. Ma, L.J. Mao, X.P. Sha, J.C. Yang, X.D. Yang, H.W. Zhao IMP/CAS, Lanzhou, People’s Republic of China H. Zhao BNL, Upton, New York, USA
	Funding: DOE NP, contract DE-AC05-06OR23177. International Partnership Program of Chinese Academy of Sciences, Grant No. 113462KYSB20170051, and the National Natural Science Foundation of China, No. 11575264. Electron cooling continues to be an invaluable technique to reduce and maintain the emittance in hadron storage rings such as the EIC and EICC where stochastic cooling is inefficient and radiative cooling is negligible. Extending the energy range of electron coolers beyond what is feasible with the conventional, electrostatic approach necessitates the use of RF fields for acceleration and, thus, a bunched electron beam. To experimentally investigate how the relative time structure of the two beams affects the cooling properties, we have set up a pulsed-beam cooling device by adding a synchronized pulsing circuit to the conventional electron source of the CSRm cooler at Institute of Modern Physics. Using both constant and modulated synchronization between electron pulses and ion bunches, we have measured the effects of the electron bunch length and longitudinal ion focusing strength on the temporal evolution of the longitudinal and transverse ion beam profile and demonstrated the detrimental effect of timing jitter as predicted by space-charge theory and simulations. Our experiment suggests a need for further investigations of specific aspects of bunched cooling such as synchro-betatron coupling and phase dithering effects when using short electron bunches to cool longer ion bunches. However, given the comparatively long IBS lifetime of higher-energy proton storage rings like the EIC, slow dithering could potentially provide an option to save cost on the electron cooler linac.
	Poster P1008 [4.213 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2021-P1008
About •	paper received ※ 05 November 2021 paper accepted ※ 13 December 2021 issue date ※ 14 November 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Simulation of High Energy Proton Beam Cooling in EicC

66

F. Ma, J. Li, X.M. Ma, L.J. Mao, X.P. Sha, M.T. Tang, J.C. Yang, X.D. Yang, H. Zhao, H.W. Zhao
IMP/CAS, Lanzhou, People’s Republic of China

The hadron beam cooling plays an important role in the future e-i collider machines to achieve various physical goals. In EicC, two-stage beam cooling scheme is proposed to maintain the luminosity during the long time collision. First, a traditional electron cooler will be used to pre-cool the low energy proton beam in the BRing. Then, an ERL-based electron cooler will be applied at the pRing to cool the proton beam at high energy. The main purpose of cooling is to counteract the emittance growth due to the IBS. In this paper, we focus on the high energy beam cooling and present some simulation studies on how the cooling rate will be affected by the electron bunch size, magnetic field, and ring parameters in the cooling section, which would be helpful for the cooler design.

Poster P1001 [1.097 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2021-P1001

About •

paper received ※ 04 November 2021 paper accepted ※ 22 November 2021 issue date ※ 27 November 2021

Export •

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

P1006

Design of the SRing Electron Target

78

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

An electron target is proposed for high precision experimental measurement at the SRing (Spectrometry Ring) of HIAF (High Intensity heavy ion Accelerator Facility). It provides low temperature electron beam with a few meV for DR (Dielectronic Recombination) experiments at the energy of 1-§I{80}{keV}. For such a low temperature, the conventional method is adopted by magnetic adiabatic expansion with a factor of 30 after acceleration within 1.2T longitudinal magnetic field at gun section. In this paper, the design optimization of the electron target is introduced.

Poster P1006 [3.085 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2021-P1006

About •

paper received ※ 04 November 2021 paper accepted ※ 22 November 2021 issue date ※ 10 December 2021

Export •

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

P1008

Electron Cooling using a Pulsed and Dithering beam from an Electrostatic Electron Cooler

81

M.W. Bruker, S.V. Benson, A. Hutton, K. Jordan, T. Powers, R.A. Rimmer, T. Satogata, A.V. Sy, H. Wang, S. Wang, H. Zhang, Y. Zhang
JLab, Newport News, Virginia, USA
J. Li, F. Ma, X.M. Ma, L.J. Mao, X.P. Sha, J.C. Yang, X.D. Yang, H.W. Zhao
IMP/CAS, Lanzhou, People’s Republic of China
H. Zhao
BNL, Upton, New York, USA

Funding: DOE NP, contract DE-AC05-06OR23177. International Partnership Program of Chinese Academy of Sciences, Grant No. 113462KYSB20170051, and the National Natural Science Foundation of China, No. 11575264.
Electron cooling continues to be an invaluable technique to reduce and maintain the emittance in hadron storage rings such as the EIC and EICC where stochastic cooling is inefficient and radiative cooling is negligible. Extending the energy range of electron coolers beyond what is feasible with the conventional, electrostatic approach necessitates the use of RF fields for acceleration and, thus, a bunched electron beam. To experimentally investigate how the relative time structure of the two beams affects the cooling properties, we have set up a pulsed-beam cooling device by adding a synchronized pulsing circuit to the conventional electron source of the CSRm cooler at Institute of Modern Physics. Using both constant and modulated synchronization between electron pulses and ion bunches, we have measured the effects of the electron bunch length and longitudinal ion focusing strength on the temporal evolution of the longitudinal and transverse ion beam profile and demonstrated the detrimental effect of timing jitter as predicted by space-charge theory and simulations. Our experiment suggests a need for further investigations of specific aspects of bunched cooling such as synchro-betatron coupling and phase dithering effects when using short electron bunches to cool longer ion bunches. However, given the comparatively long IBS lifetime of higher-energy proton storage rings like the EIC, slow dithering could potentially provide an option to save cost on the electron cooler linac.

Poster P1008 [4.213 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2021-P1008

About •

paper received ※ 05 November 2021 paper accepted ※ 13 December 2021 issue date ※ 14 November 2021

Export •

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