RF systems of the TRIUMF ISAC facility

Poirier, R.; Bricault, P.; Fong, K.; Mitra, A.K.; Uzat, H.W.; Bylinsky, Y.

doi:10.1109/pac.1999.795729

Cited by 5 publications

(5 citation statements)

References 6 publications

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“…It is of course not essential to choose the particular longitudinal coordinates in Eqs. (1), (2). Other choices are given in Table I.…”

Section: A Transoptr: Some Historical Notesmentioning

confidence: 99%

“…Such a requirement has emerged at ISAC (Isotope Separator and ACcelerator), TRIUMF's radioisotope beam (RIB) facility, whose heavy-ion postaccelerator consists of a 35.36 MHz CW RFQ, featuring external three-harmonic prebunching 5 m upstream [1], followed by a 106 MHz drift tube linac (DTL) [2]. Ongoing development of an integrated end-to-end simulation of the ISAC postaccelerator, enabling real-time beam simulations and the implementation of corrective feedback, has created the need for a computationally light, fast RFQ envelope simulation within the framework that has been developed at TRIUMF.…”

Section: Introductionmentioning

confidence: 99%

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Fast radio frequency quadrupole envelope computation for model based beam tuning

Shelbaya

Baartman

Kester

2019

Phys. Rev. Accel. Beams

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Efficient tuning of complex accelerator chains requires automated procedures, themselves reliant upon beam physical models. The Isotope Separator and ACcelerator (ISAC) facility at TRIUMF requires frequent changes of beam species (isotope), mass to charge ratio and beam energy tailored to experiment requirements, which demands rapid beam tuning. In addition, emergent effects such as long term changes of energy or energy spread require beam optimization that must be based on a complete model of the accelerator. Using an envelope code to build an end-to-end simulation of the accelerator facility for operational purposes reduces computing times by 3 or 4 orders of magnitude, when compared to particle tracking codes, so that the requisite simulations may be carried out in real time, by polling control system data. Herein described is the second order Hamiltonian for an radio frequency quadrupole (RFQ), presented within the framework of the envelope code TRANSOPTR. To benchmark the TRANSOPTR model, envelope simulations of the TRIUMF-ISAC RFQ have been performed and compared with the multiparticle code PARMTEQ.

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“…It is of course not essential to choose the particular longitudinal coordinates in Eqs. (1), (2). Other choices are given in Table I.…”

Section: A Transoptr: Some Historical Notesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fast radio frequency quadrupole envelope computation for model based beam tuning

Shelbaya

Baartman

Kester

2019

Phys. Rev. Accel. Beams

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“…The accelerating system consists of a pre-buncher, a cw RFQ, a medium energy beam transport (MEBT) section, an electron stripper, a re-buncher, and a cw drift tube linac with three split ring bunchers [3], [4], [6], [7]. The pre-buncher provides a pseudo saw tooth velocity profile at a fundamental frequency of 11.67 MHz, thereby providing approximately 86 nS between beam bursts.…”

Section: Acceleratorsmentioning

confidence: 99%

Initial commissioning of the ISAC RIB facility

Schmor

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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Construction began in 1995 on ISAC, a radioactive ion beam (RIB) and accelerator facility at TRIUMF that utilises the ISOL (on-line isotope separation) production method. ISAC includes: a new building, a beam line with adequate shielding to transport up to 100 uA of 500 MeV protons to two target/ion-source stations, remote handling facilities for the targets, a high-resolution mass-separator, linear accelerators and experimental facilities. The ISAC target/ion source station permits the production of nuclei far from stability over a large isotopic range with high luminosity. Ions from the target/ion-source can be transported at energies up to 60 keV through a low-resolution pre-separator magnet followed by a high-acceptance, high-resolution mass-separator magnet to a variety of low energy experimental stations. Alternatively, ions with q/A greater than or equal to 1/30 and an energy of 2 keV/amu can be bunched in the low energy beam transport line prior to a cw RFQ accelerator operating at 35 MHz. The 150 keV/amu beam from the RFQ is stripped and isotopes with a particular q/A greater than or equal to 1/6 are selected for acceleration in a DTL. The DTL is a separated function accelerator with five accelerating tanks and three split-ring bunchers operating cw at 105 MHz. The final energy will be variable from 0.15 to 1.5 MeV/amu. The accelerated beams will be used primarily for nuclear astrophysics studies. The beam commissioning of the proton beam line, target/ion source, mass separator and RFQ has started. The TRIUMF neutral atom trap (TRINAT) and a yield station began using the low energy ISAC beam in November 1998. The RFQ has accelerated stable ions up to 54 keV/amu. The first tank of the drift tube linac and the subsequent buncher have been commissioned at full rf power. Beam commissioning of the DTL is scheduled for the end of 1999. The full-energy RIB will become available for the DRAGON recoil spectrometer at the end of 2000. A new five-year plan that includes an upgrade of ISAC to permit acceleration of radioactive ions up to 6.5 MeV/amu for masses up to 150 amu has been presented for funding.

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“…The accelerator chain includes a 35 MHz split-ring RFQ, operating cw, to accelerate beams of A=q ऊ 30 from 2 keV/u to 150 keV/u [2]. The final RFQ electrodes will span 7.6 m with 19 modules each consisting of one ring and 40 cm of electrodes.…”

Section: Introductionmentioning

confidence: 99%

Beam test results with the ISAC 35 MHz RFQ

Laxdal¹,

Baartman²,

Root³

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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The ISAC 35 MHz split-ring RFQ is designed to accelerate ions of A=q ऊ 30 from 2 keV/u to 150 keV/u in cw mode at a constant synchronous phase of ,25 ae . Beam tests with 7 of the 19 split rings installed (E aen = 0 :55 keV/u) have recently been completed. The tests demonstrated that a constant synchronous phase RFQ with external buncher works splendidly for low beta, low intensity applications. One peculiar aspect of the RFQ is that the longitudinal acceptance is larger for beams injected off-center. The test set-up and results of both the measurements and the simulations are presented and discussed.

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RF systems of the TRIUMF ISAC facility

Cited by 5 publications

References 6 publications

Fast radio frequency quadrupole envelope computation for model based beam tuning

Fast radio frequency quadrupole envelope computation for model based beam tuning

Initial commissioning of the ISAC RIB facility

Beam test results with the ISAC 35 MHz RFQ

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