IPAC2016 - List of Authors (Qiang, J.)

Paper	Title	Page
TUPOR016	A Multi-GeV Recirculating Proton Linac	1688
	J. Qiang LBNL, Berkeley, California, USA
	A high power GeV proton linac has many scientific applications. Recirculating RF linac as an efficient accelerator has been used and proposed to accelerate both electron and muon beams. In this paper, we propose using a multi-pass recirculating RF linac to attain a multi-GeV high power proton beam. This linac consists of three types of superconducting RF cavities that accelerate the proton beam multiple times from 150 MeV to final multiple GeV energy. Such a recirculating linac can significantly reduce the number of RF cavities in the accelerator and lower the cost of the facility.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR016
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TUPOR017	Beam-beam Simulation of Crab Cavity with Frequence Dependent Noise for LHC Upgrade	1691
	J. Qiang LBNL, Berkeley, California, USA G. Arduini, Y. Papaphilippou, T. Pieloni CERN, Geneva, Switzerland J. Barranco EPFL, Lausanne, Switzerland
	High luminosity LHC upgrade will improve the luminosity of the current LHC operation by an order of magnitude. Crab cavity as a critical component for compensating luminosity loss from large crossing angle collision and also providing luminosity leveling for the LHC upgrade is being actively pursued. In this paper, we will report on the study of potential effects of the frequence-dependent crab cavity noise on the beam luminosity lifetime using strong-strong beam-beam simulations.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR017
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TUPOR018	Design Optimization of Compensation Chicanes in the LCLS-II Transport Lines	1695
	J. Qiang, C.E. Mitchell, M. Venturini LBNL, Berkeley, California, USA Y. Ding, P. Emma, Z. Huang, G. Marcus, Y. Nosochkov, T.O. Raubenheimer, L. Wang, M. Woodley SLAC, Menlo Park, California, USA
	LCLS-II is a 4th-generation high-repetition rate Free Electron Laser (FEL) based x-ray light source to be built at the SLAC National Accelerator Laboratory. To mitigate the microbunching instability, the transport lines from the exit of the Linac to the undulators will include a number of weak compensation chicanes with the purpose of cancelling the momentum compaction generated by the main bend magnets of the transport lines. In this paper, we will report on our design optimization study of these compensation chicanes in the presence of both longitudinal and transverse space-charge effects.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR018
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TUPOR019	RF Injector Beam Dynamics Optimization and Injected Beam Energy Constraints for LCLS-II	1699
	C.E. Mitchell, H.J. Qian, J. Qiang, F. Sannibale, M. Venturini LBNL, Berkeley, California, USA P. Emma, T.O. Raubenheimer, J.F. Schmerge, F. Zhou SLAC, Menlo Park, California, USA
	Funding: Work supported by the Office of Science of the US Department of Energy under Contract no. DEAC02-05CH11231. LCLS-II is a proposed high-repetition rate (>1 MHz) Free Electron Laser (FEL) X-ray light source, based on a CW, superconducting linac, to be built at SLAC National Accelerator Laboratory. The injector technology is based on a high-repetition rate RF photoinjector gun developed as part of the Advanced Photoinjector Experiment (APEX) at Lawrence Berkeley National Laboratory. Exploration of the injector design settings is performed using a multiobjective genetic optimizer to optimize the beam quality at the injector exit (~100 MeV). In this paper, we describe the current status of LCLS-II injector design optimization, with a focus on the sensitivity of the optimized solutions to the beam energy at the injector exit, which is constrained by the requirements of the downstream laser heater system.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR019
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Paper

Title

Page

A Multi-GeV Recirculating Proton Linac

1688

J. Qiang
LBNL, Berkeley, California, USA

A high power GeV proton linac has many scientific applications. Recirculating RF linac as an efficient accelerator has been used and proposed to accelerate both electron and muon beams. In this paper, we propose using a multi-pass recirculating RF linac to attain a multi-GeV high power proton beam. This linac consists of three types of superconducting RF cavities that accelerate the proton beam multiple times from 150 MeV to final multiple GeV energy. Such a recirculating linac can significantly reduce the number of RF cavities in the accelerator and lower the cost of the facility.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR016

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TUPOR017

Beam-beam Simulation of Crab Cavity with Frequence Dependent Noise for LHC Upgrade

1691

J. Qiang
LBNL, Berkeley, California, USA
G. Arduini, Y. Papaphilippou, T. Pieloni
CERN, Geneva, Switzerland
J. Barranco
EPFL, Lausanne, Switzerland

High luminosity LHC upgrade will improve the luminosity of the current LHC operation by an order of magnitude. Crab cavity as a critical component for compensating luminosity loss from large crossing angle collision and also providing luminosity leveling for the LHC upgrade is being actively pursued. In this paper, we will report on the study of potential effects of the frequence-dependent crab cavity noise on the beam luminosity lifetime using strong-strong beam-beam simulations.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR017

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TUPOR018

Design Optimization of Compensation Chicanes in the LCLS-II Transport Lines

1695

J. Qiang, C.E. Mitchell, M. Venturini
LBNL, Berkeley, California, USA
Y. Ding, P. Emma, Z. Huang, G. Marcus, Y. Nosochkov, T.O. Raubenheimer, L. Wang, M. Woodley
SLAC, Menlo Park, California, USA

LCLS-II is a 4th-generation high-repetition rate Free Electron Laser (FEL) based x-ray light source to be built at the SLAC National Accelerator Laboratory. To mitigate the microbunching instability, the transport lines from the exit of the Linac to the undulators will include a number of weak compensation chicanes with the purpose of cancelling the momentum compaction generated by the main bend magnets of the transport lines. In this paper, we will report on our design optimization study of these compensation chicanes in the presence of both longitudinal and transverse space-charge effects.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR018

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TUPOR019

RF Injector Beam Dynamics Optimization and Injected Beam Energy Constraints for LCLS-II

1699

C.E. Mitchell, H.J. Qian, J. Qiang, F. Sannibale, M. Venturini
LBNL, Berkeley, California, USA
P. Emma, T.O. Raubenheimer, J.F. Schmerge, F. Zhou
SLAC, Menlo Park, California, USA

Funding: Work supported by the Office of Science of the US Department of Energy under Contract no. DEAC02-05CH11231.
LCLS-II is a proposed high-repetition rate (>1 MHz) Free Electron Laser (FEL) X-ray light source, based on a CW, superconducting linac, to be built at SLAC National Accelerator Laboratory. The injector technology is based on a high-repetition rate RF photoinjector gun developed as part of the Advanced Photoinjector Experiment (APEX) at Lawrence Berkeley National Laboratory. Exploration of the injector design settings is performed using a multiobjective genetic optimizer to optimize the beam quality at the injector exit (~100 MeV). In this paper, we describe the current status of LCLS-II injector design optimization, with a focus on the sensitivity of the optimized solutions to the beam energy at the injector exit, which is constrained by the requirements of the downstream laser heater system.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOR019

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