ERL2019 - List of Authors (Marhauser, F.)

Paper	Title	Page
WEPNEC22	Beam Impedance Study on a Harmonic Kicker for the CCR of JLEIC	116
	G.-T. Park, J. Guo, F. Marhauser, R.A. Rimmer, H. Wang, S. Wang JLab, Newport News, Virginia, USA
	Funding: Work supported by Jefferson Science Associates, LLC under U.S DOE Contract No. DE-AC05-06OR23177 In this report, we present the development of a fast harmonic kicker, a normal conducting deflecting cavity that kicks electron bunches from ERL ring to circulator cooler ring (CCR) in Jefferson Lab Electron Ion Collider (JLEIC). This cavity utilizes 5 harmonic modes to generate a sharp kick to the electron bunch at high frequency of 86.6MHz, which is injection frequency into the CCR. The beam dynamics study and RF design of the hardware was reported in [1],[2]. In this report we present further progress including impedance by higher order mode (HOM) study and mechanical design for fabrication. [1] G. Park, et. al TUPAL068, Proc. of IPAC 2018, Apr 2018, Vancouver, BC Canada [2] G. Park, et. al, Proc. of IPAC2019, May 2019, Melbourne, Australia
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-WEPNEC22
About •	paper received ※ 30 September 2019 paper accepted ※ 04 November 2019 issue date ※ 24 June 2020
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WECOYBS05	Asymmetric SRF Dual Axis Cavity for ERLs: Studies and Design for Ultimate Performance and Applications
	I.V. Konoplev, M.E. Topp-Mugglestone JAI, Oxford, United Kingdom A.M. Bulygin, Ya.V. Shashkov MEPhI, Moscow, Russia F. Marhauser, A. Seryi JLab, Newport News, Virginia, USA
	A dual axis asymmetric SCRF ERL has been recently proposed as a possible way to drive a high average current electron beam while avoiding the BBU instability excitation. Such high current ERLs can be attractive for the next generation light sources, beam cooling in electron ion collider and isotope production. Here the results of the studies of band-pass modes and HOMs will be shown. The field distribution of the modes will be shown and asymmetric field distribution of HOMs will be demonstrated and HOMs excitations using dipole couplers will be discussed. The original design of the dual axis asymmetric cavity has been optimised to minimize the peaks of magnetic and electric fields on the cavity surface, to increase the distance between operating mode and neighbouring parasitic mode as well as to reduce the cavity manufacturing cost. To reach the goals several solutions have been suggested leading to simplification of the manufacturing as well as bringing the fields amplitudes on the cavity surface to the acceptable values. The new design of the cavity will be presented and possible applications of such a high-current ERL will be discussed.
	Slides WECOYBS05 [1.841 MB]
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Paper

Title

Page

Beam Impedance Study on a Harmonic Kicker for the CCR of JLEIC

116

G.-T. Park, J. Guo, F. Marhauser, R.A. Rimmer, H. Wang, S. Wang
JLab, Newport News, Virginia, USA

Funding: Work supported by Jefferson Science Associates, LLC under U.S DOE Contract No. DE-AC05-06OR23177
In this report, we present the development of a fast harmonic kicker, a normal conducting deflecting cavity that kicks electron bunches from ERL ring to circulator cooler ring (CCR) in Jefferson Lab Electron Ion Collider (JLEIC). This cavity utilizes 5 harmonic modes to generate a sharp kick to the electron bunch at high frequency of 86.6MHz, which is injection frequency into the CCR. The beam dynamics study and RF design of the hardware was reported in [1],[2]. In this report we present further progress including impedance by higher order mode (HOM) study and mechanical design for fabrication.
[1] G. Park, et. al TUPAL068, Proc. of IPAC 2018, Apr 2018, Vancouver, BC Canada
[2] G. Park, et. al, Proc. of IPAC2019, May 2019, Melbourne, Australia

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-WEPNEC22

About •

paper received ※ 30 September 2019 paper accepted ※ 04 November 2019 issue date ※ 24 June 2020

Export •

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

WECOYBS05

Asymmetric SRF Dual Axis Cavity for ERLs: Studies and Design for Ultimate Performance and Applications

I.V. Konoplev, M.E. Topp-Mugglestone
JAI, Oxford, United Kingdom
A.M. Bulygin, Ya.V. Shashkov
MEPhI, Moscow, Russia
F. Marhauser, A. Seryi
JLab, Newport News, Virginia, USA

A dual axis asymmetric SCRF ERL has been recently proposed as a possible way to drive a high average current electron beam while avoiding the BBU instability excitation. Such high current ERLs can be attractive for the next generation light sources, beam cooling in electron ion collider and isotope production. Here the results of the studies of band-pass modes and HOMs will be shown. The field distribution of the modes will be shown and asymmetric field distribution of HOMs will be demonstrated and HOMs excitations using dipole couplers will be discussed. The original design of the dual axis asymmetric cavity has been optimised to minimize the peaks of magnetic and electric fields on the cavity surface, to increase the distance between operating mode and neighbouring parasitic mode as well as to reduce the cavity manufacturing cost. To reach the goals several solutions have been suggested leading to simplification of the manufacturing as well as bringing the fields amplitudes on the cavity surface to the acceptable values. The new design of the cavity will be presented and possible applications of such a high-current ERL will be discussed.

Slides WECOYBS05 [1.841 MB]

Export •

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