IPAC2012 - List of Keywords (TRIUMF)

Paper	Title	Other Keywords	Page
MOOBC01	Electron Linac Photo-fission Driver for the Rare Isotope Program at TRIUMF	cryomodule, gun, cavity, linac	64
	S.R. Koscielniak, F. Ames, R.A. Baartman, I.V. Bylinskii, Y.-C. Chao, D. Dale, R.J. Dawson, A. Koveshnikov, A. Laxdal, R.E. Laxdal, F. Mammarella, L. Merminga, A.K. Mitra, Y.-N. Rao, V.A. Verzilov, D. Yosifov, V. Zvyagintsev TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada D. Karlen Victoria University, Victoria, B.C., Canada
	The TRIUMF Advanced Rare Isotope Laboratory (ARIEL) is funded since 2010 June by federal and BC Provincial governments. In collaboration with the University of Victoria, TRIUMF is proceeding with construction of a new target building, connecting tunnel, rehabilitation of an existing vault to contain the electron linear accelerator, and a cryogenic compressor building. TRIUMF starts construction of a 300 keV thermionic gun, and 10 MeV Injector cryomodule (EINJ) in 2012; the designs being complete. The 25 MeV Accelerator Cryomodule will follow in 2013. TRIUMF is embarking on major equipment purchases and has signed contracts for 4K cryogenic plant and a 290kW CW klystron, and four 1.3 GHz Nb 9-cell cavities from a local Canadian supplier. Moreover, the low energy beam transport is under construction; and detailing of two intra-cryomodule beam transports has just begun. Procurements are anticipated in mid 2012 for (i) the entire facility quadrupole magnets, and (ii) the klystron's 600kW HV power supply.
	Slides MOOBC01 [4.852 MB]

MOPPC054	Multi-code Modelling of Momentum Collimation in the TRIUMF ARIEL Linac	electron, gun, linac, simulation	253
	F.W. Jones, Y.-C. Chao, C. Gong TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	The electron linac component of the TRIUMF-ARIEL facility will provide CW beams of 50-75 MeV and up to 0.5 MW of beam power, with consequent requirements for low-loss operation. One factor in controlling beam quality is the reduction of the low-momentum tail arising from the rf-modulated 300 KV electron gun and initial capture elements prior to acceleration in the 10 MeV Injector linac. To study momentum collimation in the 10 MeV transfer line to the main linac, and its implications for downstream beam characteristics, a simulation model has been constructed using several tracking and optics codes, linked together by scripts and data converters. The model follows the evolution of the beam from the e-gun through the injector cryo-module and the medium energy transfer line where the proposed collimator is located. The components, methods and results of this application are described in detail.

MOPPC055	A New Platform for Global Optimization	linac, simulation, solenoid, emittance	256
	C. Gong, Y.-C. Chao TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	Funding: Funding is received from Natural Sciences and Engineering Research Council of Canada and National Research Council of Canada for this research. This paper describes a new platform for the multi-objective global optimization of accelerator design. While local optimization is relatively simple, global optimization for accelerator design remains a challenging task. The user often must write many lines of code to combine the output of a large variety of simulation engines, then send the results to the optimization engine. The optimization code also requires significant revision when applied to different problems. This paper presents an alternative method. The TRIUMF optimization platform, based on the genetic algorithm, is an extension of the PISA framework. It uses a flexible XML input format, in which users can easily combine multiple physics engines, such as ASTRA and PARMELA, into the same optimization problem. The TRIUMF platform is also parallel capable, designed to take advantage of computation clusters such as WestGrid. Results of the optimization platform applied to TRIUMF's 50 MeV, 0.5 MW electron linac are shown.

MOPPD023	Correction of the nu_r=3/2 Resonance in TRIUMF Cyclotron	resonance, cyclotron, extraction, simulation	415
	T. Planche, R.A. Baartman, Y.-N. Rao TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	Imperfections in the TRIUMF cyclotron are a source of field errors which slightly violate the 6-fold symmetry of the ring. Among them, the third harmonic of the magnetic gradient errors drives the ν_r=3/2 resonance. This results in a modulation of the current density versus radius observed after the resonance crossing all the way to the extraction (480 MeV). The cyclotron has sets of harmonic correction coils at different radii, each set constituted of 6 pairs of coils placed in a 6-fold symmetrical manner. The 6-fold symmetry of this layout makes that a single set of harmonic coils cannot provide a full correction of third harmonic errors driving the ν_r=3/2 resonance. The last two sets of harmonic correction coils (number 12 and 13) are azimuthally displaced. In this study, we use this fact to achieve a full correction of the resonance. We also present experimental measurements that demonstrate the full correction.

MOPPR003	Beam Diagnostic Systems for the TRIUMF e-linac	linac, diagnostics, EPICS, electron	777
	J.M. Abernathy, D. Karlen, M.O. Pfleger, P.R. Poffenberger, D.W. Storey Victoria University, Victoria, B.C., Canada F. Ames, P.S. Birney, D.P. Cameron, J.V. Holek, S.Y. Kajioka, S. Kellogg, M. Lenckowski, M. Minato, W.R. Rawnsley, J.E. Richards, V.A. Verzilov TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	Funding: NSERC, CFI, BCKDF. The TRIUMF electron linac will include a suite of diagnostics systems, including current, beam position, and beam profile monitors. This talk will present an overview of the diagnostic systems and give details about the view screen system, having both scintillator and OTR foils. Results from tests with the prototype low energy beam transport system will be shown. Diagnostic systems are particularly challenging for the e-linac due to the 500 kW beam power envisaged, with beam currents up to 10 mA at 50 MeV.

TUPPC001	Quadrupole Shapes	quadrupole, optics, controls, multipole	1149
	R.A. Baartman TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	Traditionally, quadrupoles are shaped to have a constant vertical cross-section. In other words, the poles are cylindrical segments extended in the beam direction and circular or hyperbolic in cross section. At the ends, the poles are simply truncated or sometimes slightly smoothed with a chamfer. Even very short quadrupoles are often this shape. A new shape is derived analytically, and it is demonstrated that this shape yields dramatically smaller aberrations.

Paper

Title

Other Keywords

Page

MOOBC01

Electron Linac Photo-fission Driver for the Rare Isotope Program at TRIUMF

cryomodule, gun, cavity, linac

64

S.R. Koscielniak, F. Ames, R.A. Baartman, I.V. Bylinskii, Y.-C. Chao, D. Dale, R.J. Dawson, A. Koveshnikov, A. Laxdal, R.E. Laxdal, F. Mammarella, L. Merminga, A.K. Mitra, Y.-N. Rao, V.A. Verzilov, D. Yosifov, V. Zvyagintsev
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
D. Karlen
Victoria University, Victoria, B.C., Canada

The TRIUMF Advanced Rare Isotope Laboratory (ARIEL) is funded since 2010 June by federal and BC Provincial governments. In collaboration with the University of Victoria, TRIUMF is proceeding with construction of a new target building, connecting tunnel, rehabilitation of an existing vault to contain the electron linear accelerator, and a cryogenic compressor building. TRIUMF starts construction of a 300 keV thermionic gun, and 10 MeV Injector cryomodule (EINJ) in 2012; the designs being complete. The 25 MeV Accelerator Cryomodule will follow in 2013. TRIUMF is embarking on major equipment purchases and has signed contracts for 4K cryogenic plant and a 290kW CW klystron, and four 1.3 GHz Nb 9-cell cavities from a local Canadian supplier. Moreover, the low energy beam transport is under construction; and detailing of two intra-cryomodule beam transports has just begun. Procurements are anticipated in mid 2012 for (i) the entire facility quadrupole magnets, and (ii) the klystron's 600kW HV power supply.

Slides MOOBC01 [4.852 MB]

MOPPC054

Multi-code Modelling of Momentum Collimation in the TRIUMF ARIEL Linac

electron, gun, linac, simulation

253

F.W. Jones, Y.-C. Chao, C. Gong
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

The electron linac component of the TRIUMF-ARIEL facility will provide CW beams of 50-75 MeV and up to 0.5 MW of beam power, with consequent requirements for low-loss operation. One factor in controlling beam quality is the reduction of the low-momentum tail arising from the rf-modulated 300 KV electron gun and initial capture elements prior to acceleration in the 10 MeV Injector linac. To study momentum collimation in the 10 MeV transfer line to the main linac, and its implications for downstream beam characteristics, a simulation model has been constructed using several tracking and optics codes, linked together by scripts and data converters. The model follows the evolution of the beam from the e-gun through the injector cryo-module and the medium energy transfer line where the proposed collimator is located. The components, methods and results of this application are described in detail.

MOPPC055

A New Platform for Global Optimization

linac, simulation, solenoid, emittance

256

C. Gong, Y.-C. Chao
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

Funding: Funding is received from Natural Sciences and Engineering Research Council of Canada and National Research Council of Canada for this research.
This paper describes a new platform for the multi-objective global optimization of accelerator design. While local optimization is relatively simple, global optimization for accelerator design remains a challenging task. The user often must write many lines of code to combine the output of a large variety of simulation engines, then send the results to the optimization engine. The optimization code also requires significant revision when applied to different problems. This paper presents an alternative method. The TRIUMF optimization platform, based on the genetic algorithm, is an extension of the PISA framework. It uses a flexible XML input format, in which users can easily combine multiple physics engines, such as ASTRA and PARMELA, into the same optimization problem. The TRIUMF platform is also parallel capable, designed to take advantage of computation clusters such as WestGrid. Results of the optimization platform applied to TRIUMF's 50 MeV, 0.5 MW electron linac are shown.

MOPPD023

Correction of the nu_r=3/2 Resonance in TRIUMF Cyclotron

resonance, cyclotron, extraction, simulation

415

T. Planche, R.A. Baartman, Y.-N. Rao
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

Imperfections in the TRIUMF cyclotron are a source of field errors which slightly violate the 6-fold symmetry of the ring. Among them, the third harmonic of the magnetic gradient errors drives the ν_r=3/2 resonance. This results in a modulation of the current density versus radius observed after the resonance crossing all the way to the extraction (480 MeV). The cyclotron has sets of harmonic correction coils at different radii, each set constituted of 6 pairs of coils placed in a 6-fold symmetrical manner. The 6-fold symmetry of this layout makes that a single set of harmonic coils cannot provide a full correction of third harmonic errors driving the ν_r=3/2 resonance. The last two sets of harmonic correction coils (number 12 and 13) are azimuthally displaced. In this study, we use this fact to achieve a full correction of the resonance. We also present experimental measurements that demonstrate the full correction.

MOPPR003

Beam Diagnostic Systems for the TRIUMF e-linac

linac, diagnostics, EPICS, electron

777

J.M. Abernathy, D. Karlen, M.O. Pfleger, P.R. Poffenberger, D.W. Storey
Victoria University, Victoria, B.C., Canada
F. Ames, P.S. Birney, D.P. Cameron, J.V. Holek, S.Y. Kajioka, S. Kellogg, M. Lenckowski, M. Minato, W.R. Rawnsley, J.E. Richards, V.A. Verzilov
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

Funding: NSERC, CFI, BCKDF.
The TRIUMF electron linac will include a suite of diagnostics systems, including current, beam position, and beam profile monitors. This talk will present an overview of the diagnostic systems and give details about the view screen system, having both scintillator and OTR foils. Results from tests with the prototype low energy beam transport system will be shown. Diagnostic systems are particularly challenging for the e-linac due to the 500 kW beam power envisaged, with beam currents up to 10 mA at 50 MeV.

TUPPC001

Quadrupole Shapes

quadrupole, optics, controls, multipole

1149

R.A. Baartman
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

Traditionally, quadrupoles are shaped to have a constant vertical cross-section. In other words, the poles are cylindrical segments extended in the beam direction and circular or hyperbolic in cross section. At the ends, the poles are simply truncated or sometimes slightly smoothed with a chamfer. Even very short quadrupoles are often this shape. A new shape is derived analytically, and it is demonstrated that this shape yields dramatically smaller aberrations.