COOL2015 - List of Authors (Li, R.)

Paper

Title

Page

Development of the Electron Cooling Simulation Program for MEIC

101

H. Zhang, J. Chen, R. Li
JLab, Newport News, Virginia, USA
H. Huang, L. Luo
ODU, Norfolk, Virginia, USA

Funding: Work supported by the Department of Energy, Laboratory Directed Research and Development Funding, under Contract No. DE-AC05-06OR23177
In the medium energy electron ion collider (MEIC) project at Jefferson Lab, the traditional electron cooling technique is used to reduce the ion beam emittance at the booster ring, and to compensate the intrabeam scattering effect and maintain the ion beam emittance during collision at the collider ring. A DC cooler at the booster ring and a bunched beam cooler at the collider ring are proposed. To fulfil the requirements of the cooler design for MEIC, we are developing a new program, which allows us to simulate the following cooling scenarios: DC cooling to coasting ion beam, DC cooling to bunched ion beam, bunched cooling to bunched ion beam, and bunched cooling to coasting ion beam. The new program has been benchmarked with existing code in aspect of accuracy and efficiency. The new program will be adaptive to the modern multicore hardware. We will present our models and some simulation results.

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TUPF13

Microbunching Instability in Recirculation Arcs

C.-Y. Tsai
Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA
S.V. Benson, D. Douglas, R. Li, C. Tennant, C.-Y. Tsai
JLab, Newport News, Virginia, USA

Microbunching instability is one of the most challenging issues in the design of the transport lines for recirculating or energy recovery linac machines. We have developed a linear Vlasov solver to incorporate relevant collective effects, including coherent synchrotron radiation (CSR) and longitudinal space charge (LSC) impedances, for a general linear beamline analysis. With application of this code to two specially designed recirculation arcs * and a circulating cooler ring design of MEIC at Jefferson Lab **, the resultant microbunching gain functions are presented. Some underlying physics with inclusion of these collective effects are discussed. We expect that the analysis can help illustrate the microbunching gain evolution and its spectral response, and further improve the advanced beamline designs.
* D. Douglas et al., http://arxiv.org/abs/1403.2318
** MEIC Design Summary, http://arxiv.org/abs/1504.07961

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WEXAUD03

Space Charge and CSR Microwave Physics in a Circulated Electron Cooler

R. Li, S.V. Benson, Y.S. Derbenev, D. Douglas, C. Tennant, Y. Zhang
JLab, Newport News, Virginia, USA
E.W. Nissen
CERN, Geneva, Switzerland
C.-Y. Tsai
Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA

Funding: This work is supported by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
Circulator cooler ring (CCR) was proposed * as a scheme to alleviate the high demand for the average current of the cooling beam from the electron source. However, transporting the high-brightness cooling beam through CCR for multiple turns, while preserving the phase space quality of the beam, presents significant challenges for the CCR design **. In this presentation, we describe our studies on the microbunching instability (uBI) induced by the CSR and longitudinal space charge interactions, and present results of microwave physics for a non-magnetized beam circulating in an early design of CCR *** of MEIC. It is envisioned that CCR designed for a magnetized beam will have much reduced microbunching effects. A future plan for such study will be discussed.
* R. Brinkmann, et al., Proc. of EPAC98, p345 (1998)
** C. Tennant and D. Douglas, JLAB-TN-12-027 (2012)
*** C. Tsai et al., this workshop (2015)

Slides WEXAUD03 [2.848 MB]

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Paper	Title	Page
TUPF02	Development of the Electron Cooling Simulation Program for MEIC	101
	H. Zhang, J. Chen, R. Li JLab, Newport News, Virginia, USA H. Huang, L. Luo ODU, Norfolk, Virginia, USA
	Funding: Work supported by the Department of Energy, Laboratory Directed Research and Development Funding, under Contract No. DE-AC05-06OR23177 In the medium energy electron ion collider (MEIC) project at Jefferson Lab, the traditional electron cooling technique is used to reduce the ion beam emittance at the booster ring, and to compensate the intrabeam scattering effect and maintain the ion beam emittance during collision at the collider ring. A DC cooler at the booster ring and a bunched beam cooler at the collider ring are proposed. To fulfil the requirements of the cooler design for MEIC, we are developing a new program, which allows us to simulate the following cooling scenarios: DC cooling to coasting ion beam, DC cooling to bunched ion beam, bunched cooling to bunched ion beam, and bunched cooling to coasting ion beam. The new program has been benchmarked with existing code in aspect of accuracy and efficiency. The new program will be adaptive to the modern multicore hardware. We will present our models and some simulation results.
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TUPF13	Microbunching Instability in Recirculation Arcs
	C.-Y. Tsai Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA S.V. Benson, D. Douglas, R. Li, C. Tennant, C.-Y. Tsai JLab, Newport News, Virginia, USA
	Microbunching instability is one of the most challenging issues in the design of the transport lines for recirculating or energy recovery linac machines. We have developed a linear Vlasov solver to incorporate relevant collective effects, including coherent synchrotron radiation (CSR) and longitudinal space charge (LSC) impedances, for a general linear beamline analysis. With application of this code to two specially designed recirculation arcs * and a circulating cooler ring design of MEIC at Jefferson Lab *, the resultant microbunching gain functions are presented. Some underlying physics with inclusion of these collective effects are discussed. We expect that the analysis can help illustrate the microbunching gain evolution and its spectral response, and further improve the advanced beamline designs. D. Douglas et al., http://arxiv.org/abs/1403.2318 ** MEIC Design Summary, http://arxiv.org/abs/1504.07961
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WEXAUD03	Space Charge and CSR Microwave Physics in a Circulated Electron Cooler
	R. Li, S.V. Benson, Y.S. Derbenev, D. Douglas, C. Tennant, Y. Zhang JLab, Newport News, Virginia, USA E.W. Nissen CERN, Geneva, Switzerland C.-Y. Tsai Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA
	Funding: This work is supported by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. Circulator cooler ring (CCR) was proposed * as a scheme to alleviate the high demand for the average current of the cooling beam from the electron source. However, transporting the high-brightness cooling beam through CCR for multiple turns, while preserving the phase space quality of the beam, presents significant challenges for the CCR design . In this presentation, we describe our studies on the microbunching instability (uBI) induced by the CSR and longitudinal space charge interactions, and present results of microwave physics for a non-magnetized beam circulating in an early design of CCR * of MEIC. It is envisioned that CCR designed for a magnetized beam will have much reduced microbunching effects. A future plan for such study will be discussed. * R. Brinkmann, et al., Proc. of EPAC98, p345 (1998) C. Tennant and D. Douglas, JLAB-TN-12-027 (2012) * C. Tsai et al., this workshop (2015)
	Slides WEXAUD03 [2.848 MB]
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