COOL2023 - List of Authors (Yang, J.C.)

Paper	Title	Page
TUPPM2R1	Laser cooling of bunched O⁵⁺ ion beams at the CSRe: investigation of coherent effect and extraction of momentum distribution from Schottky spectrum
	H.B. Wang, D.Y. Chen, Z. Huang, X. Ma, L.J. Mao, W.Q. Wen, J.X. Wu, J.C. Yang, Y.J. Yuan, S.F. Zhang IMP/CAS, Lanzhou, People’s Republic of China M.H. Bussmann CASUS, Görlitz, Germany D. Kiefer, T. Walther TU Darmstadt, Darmstadt, Germany S. Klammes, D.F.A. Winters GSI, Darmstadt, Germany M. Löser, M. Siebold HZDR, Dresden, Germany U. Schramm Technische Universität Dresden, Dresden, Germany D. Zhang Xidian University, Xi’an, People’s Republic of China
	Laser cooling of O⁵⁺ ion beams with an energy of 275.7 MeV/u was achieved at the storage ring CSRe in Lanzhou, China [1]. In the experiment, the momentum distribution was measured by the Schottky resonator. Besides, a multi-particle tracking method has been developed to simulate the Schottky spectra of bunched ion beams. We systematically studied the dependence of the Schottky power on the number of stored ions at different bunching and observation harmonics. The central peak is coherently enlarged only when the observation harmonic is an integer multiple of the bunching harmonic. The reason is that the randomness of the phase for each ion disappears at this condition, thus all ions coherently contribute to the Schottky power (Pcenter-N²). Therefore, the greatly enhanced central peak, caused by the "coherent effect", has been fully interpreted for the first time. Besides, we propose a new method to extract the momentum distribution from the Schottky spectrum of the bunched ion beams. Unlike the previously used methods [2], this is a very simple and precise way to obtain momentum distribution in real-time for bunched ion beams during beam cooling experiments. [1] W.Q. Wen, Hyperfine Interact. 240, 45 (2019); [2] M. Bussmann, Proceedings of COOL 2007, 226-229; K. Lasocha, PRAB 23 (2020) 062803; V. Balbekov, Proceedings of EPAC 2004, Lucerne, Switzerland.
	Slides TUPPM2R1 [8.987 MB]
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THPAM1R1	Theoretical and Simulation Study of Dispersive Electron Cooling	32
	H. Zhao, F. Ma, L.J. Mao, M.T. Tang, J.C. Yang, X.D. Yang IMP/CAS, Lanzhou, People’s Republic of China
	Funding: National Natural Science Foundation of China No. 12275323 The dispersion coupling effect has been successfully applied in stochastic cooling and laser cooling to realize 3D cooling. In electron cooling, the transverse cooling rate is usually smaller than the longitudinal one. By introducing dispersive cooling, it is possible to redistribute the cooling rate between the longitudinal and transverse planes. Theoretically, dispersive electron cooling can be achieved by introducing ion dispersion in the cooling section, and a transverse gradient of the longitudinal cooling force. The latter depends on many factors such as energy offset, transverse displacement, e-beam distribution, space charge effect, also the dispersion of e-beam. This means that there are several ways to achieve dispersive electron cooling. In my talk, I will give theoretical and simulation studies on dispersive electron cooling, and explain how these factors affect cooling rates. Based on the simple linear cooling force, a formula for estimating the cooling rate redistribution is also presented.
	Slides THPAM1R1 [2.667 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-COOL2023-THPAM1R1
About •	Received ※ 13 October 2023 — Accepted ※ 03 November 2023 — Issued ※ 02 December 2023
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THPOSRP18	Simulation Study of a Multi-Stage Rectilinear Channel for Muon Cooling	91
	R.H. Zhu, J.C. Yang, H. Zhao IMP/CAS, Lanzhou, People’s Republic of China C.T. Rogers STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	The muon collider has the potential to be the most powerful tool for the exploration of frontiers in particle physics. In order to reach the high luminosity, the 6D emittance of the muon beam needs to be reduced by several orders of magnitude. Ionization cooling, which has recently been demonstrated in 4D by the Muon Ionization Cooling Experiment (MICE), is a promising cooling method for the muon beam. In the future, muon production and 6D ionization cooling experiments are planned at the High Intensity Accelerator Facility (HIAF) at the Institute of Modern Physics, Chinese Academy of Sciences (IMP, CAS). In this paper, a multi-stage rectilinear 6D ionization cooling channel is developed and the cooling simulation results using G4Beamline are presented, indicating good performance for muon beams with large emittance. This work serves as a good starting point for future research at HIAF.
	Poster THPOSRP18 [0.327 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-COOL2023-THPOSRP18
About •	Received ※ 18 September 2023 — Revised ※ 11 October 2023 — Accepted ※ 12 October 2023 — Issued ※ 02 December 2023
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THPOSRP19	Simulation of Broadband Laser Cooling of Relativistic Ion Beams at the Csre
	D.Y. Chen, Z. Huang, X. Ma, L.J. Mao, H.B. Wang, W.Q. Wen, J.X. Wu, J.C. Yang, Y.J. Yuan, S.F. Zhang IMP/CAS, Lanzhou, People’s Republic of China M.H. Bussmann CASUS, Görlitz, Germany D. Kiefer, T. Walther TU Darmstadt, Darmstadt, Germany S. Klammes, D.F.A. Winters GSI, Darmstadt, Germany M. Löser, M. Siebold HZDR, Dresden, Germany U. Schramm Technische Universität Dresden, Dresden, Germany D. Zhang Xidian University, Xi’an, People’s Republic of China
	Laser cooling of a bunched relativistic O⁵⁺ ion beam with a cw laser has been demonstrated at the CSRe [1]. The relative momentum spread of the cooled beams has reached 2×10^-6. But laser cooling does efficiently cool the ions only within a narrow velocity class due to the narrow linewidth of the cw laser, one thus needs to scan the laser frequency relative to the rf-frequency to cool all ions [2]. To extend the acceptance of the laser force, we are planning to utilize a pulsed laser that combines with the cw laser to achieve broadband laser cooling. The pulsed laser enables simultaneous interaction with a broad velocity classes ions and the cw laser can cool the ions to lower temperatures. It should be noted that laser cooling of relativistic C³⁺ ion beams using a pulsed laser was successfully investigated at the ESR recently [3]. To study the beam cooling procedures, simulations of the cooling dynamics under different conditions are being performed based on our newly developed simulation code [4]. Through simulations, the optimal conditions for achieving efficient beam cooling will be determined to guide the successful implementation of the broadband laser cooling experiments. [1] W.Q. Wen et al., to be submitted. [2] M. Bussmann et al., J. Phys: Conf. Ser. 88 (2007) 012043. [3] S. Klammes et al., COOL2023 conference. [4] D.Y. Chen et al., NIMA 1047 (2023) 167852.
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Paper

Title

Page

TUPPM2R1

Laser cooling of bunched O⁵⁺ ion beams at the CSRe: investigation of coherent effect and extraction of momentum distribution from Schottky spectrum

H.B. Wang, D.Y. Chen, Z. Huang, X. Ma, L.J. Mao, W.Q. Wen, J.X. Wu, J.C. Yang, Y.J. Yuan, S.F. Zhang
IMP/CAS, Lanzhou, People’s Republic of China
M.H. Bussmann
CASUS, Görlitz, Germany
D. Kiefer, T. Walther
TU Darmstadt, Darmstadt, Germany
S. Klammes, D.F.A. Winters
GSI, Darmstadt, Germany
M. Löser, M. Siebold
HZDR, Dresden, Germany
U. Schramm
Technische Universität Dresden, Dresden, Germany
D. Zhang
Xidian University, Xi’an, People’s Republic of China

Laser cooling of O⁵⁺ ion beams with an energy of 275.7 MeV/u was achieved at the storage ring CSRe in Lanzhou, China [1]. In the experiment, the momentum distribution was measured by the Schottky resonator. Besides, a multi-particle tracking method has been developed to simulate the Schottky spectra of bunched ion beams. We systematically studied the dependence of the Schottky power on the number of stored ions at different bunching and observation harmonics. The central peak is coherently enlarged only when the observation harmonic is an integer multiple of the bunching harmonic. The reason is that the randomness of the phase for each ion disappears at this condition, thus all ions coherently contribute to the Schottky power (Pcenter-N²). Therefore, the greatly enhanced central peak, caused by the "coherent effect", has been fully interpreted for the first time. Besides, we propose a new method to extract the momentum distribution from the Schottky spectrum of the bunched ion beams. Unlike the previously used methods [2], this is a very simple and precise way to obtain momentum distribution in real-time for bunched ion beams during beam cooling experiments.
[1] W.Q. Wen, Hyperfine Interact. 240, 45 (2019);
[2] M. Bussmann, Proceedings of COOL 2007, 226-229; K. Lasocha, PRAB 23 (2020) 062803; V. Balbekov, Proceedings of EPAC 2004, Lucerne, Switzerland.

Slides TUPPM2R1 [8.987 MB]

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

THPAM1R1

Theoretical and Simulation Study of Dispersive Electron Cooling

32

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

Funding: National Natural Science Foundation of China No. 12275323
The dispersion coupling effect has been successfully applied in stochastic cooling and laser cooling to realize 3D cooling. In electron cooling, the transverse cooling rate is usually smaller than the longitudinal one. By introducing dispersive cooling, it is possible to redistribute the cooling rate between the longitudinal and transverse planes. Theoretically, dispersive electron cooling can be achieved by introducing ion dispersion in the cooling section, and a transverse gradient of the longitudinal cooling force. The latter depends on many factors such as energy offset, transverse displacement, e-beam distribution, space charge effect, also the dispersion of e-beam. This means that there are several ways to achieve dispersive electron cooling. In my talk, I will give theoretical and simulation studies on dispersive electron cooling, and explain how these factors affect cooling rates. Based on the simple linear cooling force, a formula for estimating the cooling rate redistribution is also presented.

Slides THPAM1R1 [2.667 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-COOL2023-THPAM1R1

About •

Received ※ 13 October 2023 — Accepted ※ 03 November 2023 — Issued ※ 02 December 2023

Cite •

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

THPOSRP18

Simulation Study of a Multi-Stage Rectilinear Channel for Muon Cooling

91

R.H. Zhu, J.C. Yang, H. Zhao
IMP/CAS, Lanzhou, People’s Republic of China
C.T. Rogers
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

The muon collider has the potential to be the most powerful tool for the exploration of frontiers in particle physics. In order to reach the high luminosity, the 6D emittance of the muon beam needs to be reduced by several orders of magnitude. Ionization cooling, which has recently been demonstrated in 4D by the Muon Ionization Cooling Experiment (MICE), is a promising cooling method for the muon beam. In the future, muon production and 6D ionization cooling experiments are planned at the High Intensity Accelerator Facility (HIAF) at the Institute of Modern Physics, Chinese Academy of Sciences (IMP, CAS). In this paper, a multi-stage rectilinear 6D ionization cooling channel is developed and the cooling simulation results using G4Beamline are presented, indicating good performance for muon beams with large emittance. This work serves as a good starting point for future research at HIAF.

Poster THPOSRP18 [0.327 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-COOL2023-THPOSRP18

About •

Received ※ 18 September 2023 — Revised ※ 11 October 2023 — Accepted ※ 12 October 2023 — Issued ※ 02 December 2023

Cite •

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

THPOSRP19

Simulation of Broadband Laser Cooling of Relativistic Ion Beams at the Csre

D.Y. Chen, Z. Huang, X. Ma, L.J. Mao, H.B. Wang, W.Q. Wen, J.X. Wu, J.C. Yang, Y.J. Yuan, S.F. Zhang
IMP/CAS, Lanzhou, People’s Republic of China
M.H. Bussmann
CASUS, Görlitz, Germany
D. Kiefer, T. Walther
TU Darmstadt, Darmstadt, Germany
S. Klammes, D.F.A. Winters
GSI, Darmstadt, Germany
M. Löser, M. Siebold
HZDR, Dresden, Germany
U. Schramm
Technische Universität Dresden, Dresden, Germany
D. Zhang
Xidian University, Xi’an, People’s Republic of China

Laser cooling of a bunched relativistic O⁵⁺ ion beam with a cw laser has been demonstrated at the CSRe [1]. The relative momentum spread of the cooled beams has reached 2×10^-6. But laser cooling does efficiently cool the ions only within a narrow velocity class due to the narrow linewidth of the cw laser, one thus needs to scan the laser frequency relative to the rf-frequency to cool all ions [2]. To extend the acceptance of the laser force, we are planning to utilize a pulsed laser that combines with the cw laser to achieve broadband laser cooling. The pulsed laser enables simultaneous interaction with a broad velocity classes ions and the cw laser can cool the ions to lower temperatures. It should be noted that laser cooling of relativistic C³⁺ ion beams using a pulsed laser was successfully investigated at the ESR recently [3]. To study the beam cooling procedures, simulations of the cooling dynamics under different conditions are being performed based on our newly developed simulation code [4]. Through simulations, the optimal conditions for achieving efficient beam cooling will be determined to guide the successful implementation of the broadband laser cooling experiments.
[1] W.Q. Wen et al., to be submitted.
[2] M. Bussmann et al., J. Phys: Conf. Ser. 88 (2007) 012043.
[3] S. Klammes et al., COOL2023 conference.
[4] D.Y. Chen et al., NIMA 1047 (2023) 167852.

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