PAC2013 - List of Authors (Chao, Y.-C.)

Paper	Title	Page
THPAC01	Longitudinal Emittance Measurement System for the ARIEL Electron Linac	1139
	A.R. Vrielink, Y.-C. Chao, C. Gong, R.E. Laxdal, V. Zvyagintsev TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	As part of the ARIEL e-LINAC project at TRIUMF, a 1.3 GHz single-cell, room-temperature deflecting cavity has been developed to study the temporal distribution of an electron beam from a 300 kV thermionic gun. Beam bunches on the order of 100-200 ps long are produced from a biased grid with a 650MHz RF voltage superimposed to periodically allow release of electrons. The RF deflector operates in a TM110-like mode, deflecting the electrons vertically with a magnitude dependent on their arrival phase. The cavity RF performance has been characterized through signal level and beam testing. The deflector is installed as part of a longitudinal emittance measurement system with beam collimation, a 90 degree analyzing magnet, the deflecting cavity and a final view screen. Initial beam bunch length measurements using this RF cavity, conducted in conjunction with the initial commissioning using a 100kV electron-gun and a 1.3GHz buncher, are presented. The beam bunch length was extracted by comparing data collected at a screen downstream of the deflector to an analytical model based on linear time-invariant system theory and 3D simulation results using General Particle Tracer.

THPBA01	Beam Dynamics Driven Requirements on the ARIEL e-linac SRF Separator Cavity	1223
	D.W. Storey Victoria University, Victoria, B.C., Canada Y.-C. Chao, L. Merminga TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	Funding: Natural Sciences and Engineering Research Council of Canada A possible future extension to TRIUMF's ARIEL e-linac is the addition of a recirculation path for an Energy Recovery Linac (ERL), which will drive an Infrared Free Electron Laser (FEL). The ERL electron beam will be interleaved with the single-pass beam bound for Rare Isotope Beam (RIB) production in the ARIEL facilities, allowing for simultaneous beam delivery to both FEL and RIB users. A superconducting RF separator will separate the beams at the exit of the linac at a frequency of 650MHz in CW mode. After a second pass through the linac, the energy recovered ERL beam will pass through the separator cavity out of phase with the deflecting fields, and at a much lower energy, before continuing to a beam dump. Using the General Particle Tracer software, three-dimensional simulations of the beam dynamics of the passing beams have been performed to determine the requirements on the SRF separator's deflecting field uniformity. Operation of the FEL requires minimal emittance dilution of the ERL beam from the separator. This contribution describes the results of these studies and the requirements imposed on the SRF beam separator.

Paper

Title

Page

Longitudinal Emittance Measurement System for the ARIEL Electron Linac

1139

A.R. Vrielink, Y.-C. Chao, C. Gong, R.E. Laxdal, V. Zvyagintsev
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

As part of the ARIEL e-LINAC project at TRIUMF, a 1.3 GHz single-cell, room-temperature deflecting cavity has been developed to study the temporal distribution of an electron beam from a 300 kV thermionic gun. Beam bunches on the order of 100-200 ps long are produced from a biased grid with a 650MHz RF voltage superimposed to periodically allow release of electrons. The RF deflector operates in a TM110-like mode, deflecting the electrons vertically with a magnitude dependent on their arrival phase. The cavity RF performance has been characterized through signal level and beam testing. The deflector is installed as part of a longitudinal emittance measurement system with beam collimation, a 90 degree analyzing magnet, the deflecting cavity and a final view screen. Initial beam bunch length measurements using this RF cavity, conducted in conjunction with the initial commissioning using a 100kV electron-gun and a 1.3GHz buncher, are presented. The beam bunch length was extracted by comparing data collected at a screen downstream of the deflector to an analytical model based on linear time-invariant system theory and 3D simulation results using General Particle Tracer.

THPBA01

Beam Dynamics Driven Requirements on the ARIEL e-linac SRF Separator Cavity

1223

D.W. Storey
Victoria University, Victoria, B.C., Canada
Y.-C. Chao, L. Merminga
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

Funding: Natural Sciences and Engineering Research Council of Canada
A possible future extension to TRIUMF's ARIEL e-linac is the addition of a recirculation path for an Energy Recovery Linac (ERL), which will drive an Infrared Free Electron Laser (FEL). The ERL electron beam will be interleaved with the single-pass beam bound for Rare Isotope Beam (RIB) production in the ARIEL facilities, allowing for simultaneous beam delivery to both FEL and RIB users. A superconducting RF separator will separate the beams at the exit of the linac at a frequency of 650MHz in CW mode. After a second pass through the linac, the energy recovered ERL beam will pass through the separator cavity out of phase with the deflecting fields, and at a much lower energy, before continuing to a beam dump. Using the General Particle Tracer software, three-dimensional simulations of the beam dynamics of the passing beams have been performed to determine the requirements on the SRF separator's deflecting field uniformity. Operation of the FEL requires minimal emittance dilution of the ERL beam from the separator. This contribution describes the results of these studies and the requirements imposed on the SRF beam separator.