PAC2013 - List of Authors (Laxdal, R.E.)

Paper	Title	Page
WEPHO01	High Power RF System for e-linac for TRIUMF	934
	A.K. Mitra, Z.T. Ang, I.V. Bylinskii, S. Calic, D. Dale, S.R. Koscielniak, R.E. Laxdal, F. Mammarella TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	The TRIUMF e-linac high power system will be built in stages. For the first phase of installation to be completed by September 2014, the injector cryomodule (EINJ) will be fed by a 290 kW cw at a reduced power level and the accelerating cryomodule (EACA) will be powered by an identical 290 kW CW klystron. The second klystron and second high voltage power supply are also being procured from CPI and Ampegon respectively. The 290 kW cw 1.3 GHz klystron is a factory tuned multi-cavity, high efficiency, high gain, broadband, water cooled tube. The klystron has been tested at the factory. The maximum usable linear range of the rf output power of the klystron is 270 kW and is governed by the incremental gain of 0.5 dB/dB. The high voltage power supply system (KPS) for the klystron, based on a voltage controlled power module technology, consists of 65 kV beam power supply, focus supply, filament power supply and vacuum ion pump power supply. The klystron will be tested to full power on a dummy load by October 2013. At the same time, the KPS will be tested fully with all controls, interlocks, protections and integration of the klystron and a 300 kW high power circulator.

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.

THPBA02	Feasibility of an RF Dipole Cavity for the ARIEL e-linac SRF Separator	1226
	D.W. Storey Victoria University, Victoria, B.C., Canada R.E. Laxdal, L. Merminga, V. Zvyagintsev TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	Funding: Natural Sciences and Engineering Research Council of Canada A megawatt class CW e-linac is being designed and constructed at TRIUMF with the main goal of producing neutron rich isotopes for TRIUMF's Rare Isotope Beam (RIB) program. A possible extension of the beam-line will allow recirculation of the beam for an Energy Recovery Linac (ERL) to operate in tandem with the RIB user program. A superconducting cavity with RF dipole geometry is being considered for separation of the ERL and RIB beams at the end of the linac to provide simultaneous beams to both the ERL and RIB programs. This contribution describes optimization studies performed on the RF dipole design to determine if this geometry will meet the requirements of the ARIEL e-linac. The resulting 650 MHz structure has compact cavity dimensions, low peak fields, and high transverse shunt impedance. Due to the large aperture beam-line and stringent requirement on preserving beam quality, extensive focus has been placed on transverse uniformity of the deflecting fields.

FRYBA1	Progress towards the Facility for Rare Isotope Beams	1453
	J. Wei, N.K. Bultman, F. Casagrande, C. Compton, K.D. Davidson, J. DeKamp, B. Drewyor, K. Elliott, A. Facco, P.E. Gibson, T . Glasmacher, K. Holland, M.J. Johnson, S. Jones, D. Leitner, M. Leitner, G. Machicoane, F. Marti, D. Morris, J.A. Nolen, J.P. Ozelis, S. Peng, J. Popielarski, L. Popielarski, E. Pozdeyev, T. Russo, K. Saito, J.J. Savino, R.C. Webber, M. Williams, T. Xu, Y. Yamazaki, A. Zeller, Y. Zhang, Q. Zhao FRIB, East Lansing, USA D. Arenius, V. Ganni JLAB, Newport News, Virginia, USA A. Facco INFN/LNL, Legnaro (PD), Italy R.E. Laxdal TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada J.A. Nolen ANL, Argonne, USA
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 The Facility for Rare Isotope Beams (FRIB) is based on a continuous-wave superconducting heavy ion linac to accelerate all the stable isotopes to above 200 MeV/u with a beam power of up to 400 kW. At an average beam power approximately two-to-three orders-of-magnitude higher than those of operating heavy-ion facilities, FRIB stands at the power frontier of the accelerator family - the first time for heavy-ion accelerators. To realize this innovative performance, superconducting RF cavities are used starting at the very low energy of 500 keV/u, and beams with multiple charge states are accelerated simultaneously. Many technological challenges specific for this linac have been tackled by the FRIB team and collaborators. Furthermore, the distinct differences from the other types of linacs at the power front must be clearly understood to make the FRIB successful. This report summarizes the technical progress made in the past years to meet these challenges.

Paper

Title

Page

High Power RF System for e-linac for TRIUMF

934

A.K. Mitra, Z.T. Ang, I.V. Bylinskii, S. Calic, D. Dale, S.R. Koscielniak, R.E. Laxdal, F. Mammarella
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

The TRIUMF e-linac high power system will be built in stages. For the first phase of installation to be completed by September 2014, the injector cryomodule (EINJ) will be fed by a 290 kW cw at a reduced power level and the accelerating cryomodule (EACA) will be powered by an identical 290 kW CW klystron. The second klystron and second high voltage power supply are also being procured from CPI and Ampegon respectively. The 290 kW cw 1.3 GHz klystron is a factory tuned multi-cavity, high efficiency, high gain, broadband, water cooled tube. The klystron has been tested at the factory. The maximum usable linear range of the rf output power of the klystron is 270 kW and is governed by the incremental gain of 0.5 dB/dB. The high voltage power supply system (KPS) for the klystron, based on a voltage controlled power module technology, consists of 65 kV beam power supply, focus supply, filament power supply and vacuum ion pump power supply. The klystron will be tested to full power on a dummy load by October 2013. At the same time, the KPS will be tested fully with all controls, interlocks, protections and integration of the klystron and a 300 kW high power circulator.

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.

THPBA02

Feasibility of an RF Dipole Cavity for the ARIEL e-linac SRF Separator

1226

D.W. Storey
Victoria University, Victoria, B.C., Canada
R.E. Laxdal, L. Merminga, V. Zvyagintsev
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

Funding: Natural Sciences and Engineering Research Council of Canada
A megawatt class CW e-linac is being designed and constructed at TRIUMF with the main goal of producing neutron rich isotopes for TRIUMF's Rare Isotope Beam (RIB) program. A possible extension of the beam-line will allow recirculation of the beam for an Energy Recovery Linac (ERL) to operate in tandem with the RIB user program. A superconducting cavity with RF dipole geometry is being considered for separation of the ERL and RIB beams at the end of the linac to provide simultaneous beams to both the ERL and RIB programs. This contribution describes optimization studies performed on the RF dipole design to determine if this geometry will meet the requirements of the ARIEL e-linac. The resulting 650 MHz structure has compact cavity dimensions, low peak fields, and high transverse shunt impedance. Due to the large aperture beam-line and stringent requirement on preserving beam quality, extensive focus has been placed on transverse uniformity of the deflecting fields.

FRYBA1

Progress towards the Facility for Rare Isotope Beams

1453

J. Wei, N.K. Bultman, F. Casagrande, C. Compton, K.D. Davidson, J. DeKamp, B. Drewyor, K. Elliott, A. Facco, P.E. Gibson, T . Glasmacher, K. Holland, M.J. Johnson, S. Jones, D. Leitner, M. Leitner, G. Machicoane, F. Marti, D. Morris, J.A. Nolen, J.P. Ozelis, S. Peng, J. Popielarski, L. Popielarski, E. Pozdeyev, T. Russo, K. Saito, J.J. Savino, R.C. Webber, M. Williams, T. Xu, Y. Yamazaki, A. Zeller, Y. Zhang, Q. Zhao
FRIB, East Lansing, USA
D. Arenius, V. Ganni
JLAB, Newport News, Virginia, USA
A. Facco
INFN/LNL, Legnaro (PD), Italy
R.E. Laxdal
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
J.A. Nolen
ANL, Argonne, USA

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The Facility for Rare Isotope Beams (FRIB) is based on a continuous-wave superconducting heavy ion linac to accelerate all the stable isotopes to above 200 MeV/u with a beam power of up to 400 kW. At an average beam power approximately two-to-three orders-of-magnitude higher than those of operating heavy-ion facilities, FRIB stands at the power frontier of the accelerator family - the first time for heavy-ion accelerators. To realize this innovative performance, superconducting RF cavities are used starting at the very low energy of 500 keV/u, and beams with multiple charge states are accelerated simultaneously. Many technological challenges specific for this linac have been tackled by the FRIB team and collaborators. Furthermore, the distinct differences from the other types of linacs at the power front must be clearly understood to make the FRIB successful. This report summarizes the technical progress made in the past years to meet these challenges.