2011 Particle Accelerator Conference - List of Keywords (TRIUMF)

Paper	Title	Other Keywords	Page
MOP290	Self Excited Operation for a 1.3 GHz 5-cell Superconducting Cavity	cavity, controls, feedback, superconducting-cavity	660
	K. Fong, M.P. Laverty, Q. Zheng TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada E.P. Chojnacki, G.H. Hoffstaetter, D. Meidlinger, S.P. Wang CLASSE, Ithaca, New York, USA
	Self-Excited operation of a resonant system does not require any external frequency tracking as the frequency is determined by the phase lag of the self-excited loop, it is therefore particularly useful for testing high Q RF cavities that do not have an automatic tuning mechanism. Self-exited operation has long been shown to work with single-cell cavities. We have recently demonstrated that it is also possible for multi-cell cavities, where multiple resonant modes are present. The Cornell 1.3 GHz 5-cell superconducting cavities was operated using Self-Excited operation and we were able to lock to the accelerating (pi) mode, despite the presence of neighbouring modes that are less than 10 MHz away. By means of the loops phase advance, we were able to select which mode was excited.

WEOCS6	The Injector Cryomodule for e-Linac at TRIUMF	cryomodule, linac, ISAC, cavity	1469
	R.E. Laxdal, C.D. Beard, S.R. Koscielniak, A. Koveshnikov, A.K. Mitra, T.C. Ries, I. Sekachev, V. Zvyagintsev TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada M. Mondal, V. Naik DAE/VECC, Calcutta, India
	The e-Linac project at TRIUMF, now funded, is specified to accelerate 10mA of electrons to 50MeV using 1.3GHz multi-cell superconducting cavities. The linac consists of three cryomodules; an injector cryomodule with one cavity and two accelerating modules with two cavities each. The injector module is being designed and constructed in collaboration with VECC in Kolkata. The design utilizes a unique box cryomodule with a top-loading cold mass. A 4K phase separator, 2K-4K heat exchanger and Joule-Thompson valve are installed within each module to produce 2K liquid. The design and status of the development will be presented.
	Slides WEOCS6 [13.002 MB]

WEP231	TRIUMF Cyclotron Beam Quality Improvement	cyclotron, extraction, emittance, beam-losses	1921
	I.V. Bylinskii, R.A. Baartman, F.W. Bach, J.F. Cessford, G. Dutto, Y.-N. Rao, L.W. Root, R. Ruegg TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	TRIUMF cyclotron for decades operated at 500 MeV. Recently, the two primary beamlines 1A and 2A, have been reconfigured for running at 480 MeV. The objective was to reduce beam losses caused by the electromagnetic stripping by 30%. The radiation losses reduction was confirmed with both online measurements and residual activation field mapping after 8 month of beam production. In order to improve stability of both primary beams, one of the harmonic coils was configured in Bz-mode to compensate for the beam split ratio fluctuations. Br-mode of this coil and two outer radius trim coils was utilized to correct the beam vertical position at extraction. Moreover, to make the beam spot position on the target stable and insensitive to any uncontrolled movement of the stripper foil due to heat distortion, the beamline front end optics was tuned to compensate the cyclotron's inherent dispersion. Details of these developments and improvements are discussed in the paper.

FROBN4	Commissioning of the 20MV Superconducting Linac Upgrade at TRIUMF	ISAC, linac, target, ion	2570
	M. Marchetto TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	The Phase II upgrade of the ISAC-II Superconducting Heavy Ion Linac involves the addition of twenty quarter-wave bulk niobium resonators housed in three cryomodules. This addition brings the total installed accelerating voltage from 20MV to 40MV. The cavities are produced in Canadian industry with cavity testing and cryomodule assembly at TRIUMF. The speaker will discuss commissioning of, and operations with, this major upgrade, which commenced in April 2010.
	Slides FROBN4 [3.990 MB]

Paper

Title

Other Keywords

Page

MOP290

Self Excited Operation for a 1.3 GHz 5-cell Superconducting Cavity

cavity, controls, feedback, superconducting-cavity

660

K. Fong, M.P. Laverty, Q. Zheng
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
E.P. Chojnacki, G.H. Hoffstaetter, D. Meidlinger, S.P. Wang
CLASSE, Ithaca, New York, USA

Self-Excited operation of a resonant system does not require any external frequency tracking as the frequency is determined by the phase lag of the self-excited loop, it is therefore particularly useful for testing high Q RF cavities that do not have an automatic tuning mechanism. Self-exited operation has long been shown to work with single-cell cavities. We have recently demonstrated that it is also possible for multi-cell cavities, where multiple resonant modes are present. The Cornell 1.3 GHz 5-cell superconducting cavities was operated using Self-Excited operation and we were able to lock to the accelerating (pi) mode, despite the presence of neighbouring modes that are less than 10 MHz away. By means of the loops phase advance, we were able to select which mode was excited.

WEOCS6

The Injector Cryomodule for e-Linac at TRIUMF

cryomodule, linac, ISAC, cavity

1469

R.E. Laxdal, C.D. Beard, S.R. Koscielniak, A. Koveshnikov, A.K. Mitra, T.C. Ries, I. Sekachev, V. Zvyagintsev
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
M. Mondal, V. Naik
DAE/VECC, Calcutta, India

The e-Linac project at TRIUMF, now funded, is specified to accelerate 10mA of electrons to 50MeV using 1.3GHz multi-cell superconducting cavities. The linac consists of three cryomodules; an injector cryomodule with one cavity and two accelerating modules with two cavities each. The injector module is being designed and constructed in collaboration with VECC in Kolkata. The design utilizes a unique box cryomodule with a top-loading cold mass. A 4K phase separator, 2K-4K heat exchanger and Joule-Thompson valve are installed within each module to produce 2K liquid. The design and status of the development will be presented.

Slides WEOCS6 [13.002 MB]

WEP231

TRIUMF Cyclotron Beam Quality Improvement

cyclotron, extraction, emittance, beam-losses

1921

I.V. Bylinskii, R.A. Baartman, F.W. Bach, J.F. Cessford, G. Dutto, Y.-N. Rao, L.W. Root, R. Ruegg
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

TRIUMF cyclotron for decades operated at 500 MeV. Recently, the two primary beamlines 1A and 2A, have been reconfigured for running at 480 MeV. The objective was to reduce beam losses caused by the electromagnetic stripping by 30%. The radiation losses reduction was confirmed with both online measurements and residual activation field mapping after 8 month of beam production. In order to improve stability of both primary beams, one of the harmonic coils was configured in Bz-mode to compensate for the beam split ratio fluctuations. Br-mode of this coil and two outer radius trim coils was utilized to correct the beam vertical position at extraction. Moreover, to make the beam spot position on the target stable and insensitive to any uncontrolled movement of the stripper foil due to heat distortion, the beamline front end optics was tuned to compensate the cyclotron's inherent dispersion. Details of these developments and improvements are discussed in the paper.

FROBN4

Commissioning of the 20MV Superconducting Linac Upgrade at TRIUMF

ISAC, linac, target, ion

2570

M. Marchetto
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

The Phase II upgrade of the ISAC-II Superconducting Heavy Ion Linac involves the addition of twenty quarter-wave bulk niobium resonators housed in three cryomodules. This addition brings the total installed accelerating voltage from 20MV to 40MV. The cavities are produced in Canadian industry with cavity testing and cryomodule assembly at TRIUMF. The speaker will discuss commissioning of, and operations with, this major upgrade, which commenced in April 2010.

Slides FROBN4 [3.990 MB]