COOL2021 - List of Authors (Kayran, D.)

Paper	Title	Page
S601	Electron Cooling of Colliding Ion Beams in RHIC: Status and Perspectives	42
	A.V. Fedotov, W. Fischer, X. Gu, D. Kayran, J. Kewisch, M.G. Minty, V. Schoefer, S. Seletskiy, H. Zhao BNL, Upton, New York, USA
	Funding: Work supported by the U.S. Department of Energy An electron cooling of ion beams employing a high-energy approach with rf-accelerated electron bunches was recently implemented at BNL using LEReC accelerator. Following successful cooling commissioning in 2019, it was used to cool ion beams in both collider rings with ion beams in collision. Electron cooler LEReC successfully operated for the RHIC physics program in 2020 and 2021 and was essential in achieving the required luminosity goals. Apart from its use in RHIC operations, LEReC is being used to study various aspects of electron cooling physics using short electron bunches. This presentation will summarize experience with electron cooling of colliding ion beams in RHIC, as well as ongoing studies.
	Slides S601 [7.414 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2021-S601
About •	paper received ※ 31 October 2021 paper accepted ※ 22 November 2021 issue date ※ 07 December 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

S602	Theory and Observation of Circular Attractors in Cooled Ion Bunches
	S. Seletskiy, A.V. Fedotov, D. Kayran BNL, Upton, New York, USA
	In electron coolers, under certain conditions, a mismatch in either gamma-factors or trajectory angles between an electron and an ion beam can cause formation of a circular attractor in the ion beam phase space. This leads to coherent excitations, rather than damping, of the ions with a small synchrotron or betatron amplitude and results in an unusual beam dynamics. In this paper we consider the effect of such coherent excitations, report the first observation of the circular attractor in a relativistic electron cooler and discuss the implications of this effect for high energy electron coolers proposed for the Electron Ion Collider (EIC).
	Slides S602 [4.306 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Electron Cooling of Colliding Ion Beams in RHIC: Status and Perspectives

42

A.V. Fedotov, W. Fischer, X. Gu, D. Kayran, J. Kewisch, M.G. Minty, V. Schoefer, S. Seletskiy, H. Zhao
BNL, Upton, New York, USA

Funding: Work supported by the U.S. Department of Energy
An electron cooling of ion beams employing a high-energy approach with rf-accelerated electron bunches was recently implemented at BNL using LEReC accelerator. Following successful cooling commissioning in 2019, it was used to cool ion beams in both collider rings with ion beams in collision. Electron cooler LEReC successfully operated for the RHIC physics program in 2020 and 2021 and was essential in achieving the required luminosity goals. Apart from its use in RHIC operations, LEReC is being used to study various aspects of electron cooling physics using short electron bunches. This presentation will summarize experience with electron cooling of colliding ion beams in RHIC, as well as ongoing studies.

Slides S601 [7.414 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-COOL2021-S601

About •

paper received ※ 31 October 2021 paper accepted ※ 22 November 2021 issue date ※ 07 December 2021

Export •

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

S602

Theory and Observation of Circular Attractors in Cooled Ion Bunches

S. Seletskiy, A.V. Fedotov, D. Kayran
BNL, Upton, New York, USA

In electron coolers, under certain conditions, a mismatch in either gamma-factors or trajectory angles between an electron and an ion beam can cause formation of a circular attractor in the ion beam phase space. This leads to coherent excitations, rather than damping, of the ions with a small synchrotron or betatron amplitude and results in an unusual beam dynamics. In this paper we consider the effect of such coherent excitations, report the first observation of the circular attractor in a relativistic electron cooler and discuss the implications of this effect for high energy electron coolers proposed for the Electron Ion Collider (EIC).

Slides S602 [4.306 MB]

Export •

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