[en] A λ/4, 92 MHz cavity is now operating in the TRIUMF cyclotron. The device, when operating at 50 kW and at a peak voltage of 140 kV, increases the energy gain per turn from 0.32 MeV to a maximum of 0.60 MeV in the 370-520 MeV range. This reduces electro-magnetic stripping losses from 8% to 5% and lowers the beam induced tank activation by ∼ 1/3. The cavity allows other modes of operation. In particular the cavity has been phased to oppose the fundamental rf to produce a localized flattop in the energy gain, stabilizing the precession pattern during resonant extraction. When the power is increased in flattop mode the corresponding strong phase expansion has been observed to split the longitudinal phase band into two bunches. In principle, additional cavities could further sub-divide the extracted beam time structures. (author)

[en] A conceptual design for an ISOL post-accelerator, based on superconducting linac structures developed at Argonne National Laboratory was described in earlier papers. Periodic focusing provided by 7 T solenoids spaced at 8 cell intervals could maintain adequate transverse focusing only if the accelerating gradients were kept well below the demonstrated 6 MV/m capability of the SC structures. To permit higher accelerating gradients several variations of the solenoid focusing as well as RFQ focusing elements have been investigated. The RFQ elements are βλ long and act like a quadrupole doublet with time dependent fields that can be much higher than in an electrostatic quadrupole. Using RFQ focusing with 93 kV/cm peak fields in a 1 cm radius bore, spaced at eight cell intervals, it was found that adequate focusing to compensate for the rf defocusing associated with 6 MV/rm accelerating gradients could be achieved. The 5.6 m drift-tube linac length in stage 1 of the previous conceptual design could then be reduced to 3.1 m. (author)

[en] The direct extraction of high intensities of H^- ions from the TRIUMF cyclotron and their injection into an accumulator ring will impose demands on beam quality and thereby on the fields of the added extraction hardware and on the operation of the cyclotron. The fields of each of the extraction devices have been simulated in computer codes to estimate their influence on the final extracted emittance. Parameters controlling vertical emittance have been experimentally investigated to devise an optimum tuning procedure. Results of both computer simulations and experimental beam tests will be given. (author)

[en] Two versions of injection line matching sections between the external ion source and the spiral inflector are used for the compact cyclotrons developed at TRIUMF in cooperation with Ebco Technologies. The 30 MeV model adopts a solenoid- doublet (SQQ) version while the 19 MeV unit takes a four quadrupole/two quadrupole (4Q/2Q) option. Both cyclotrons use a same type of H^- cusp source and an identical inflector-central region combination. A comparison has been made between these two systems, in terms of DC transmission and RF acceptance as a function of source's H^- current intensity and emittance. The design and optics characteristics for both systems are described and the results obtained are reported. (author). 10 refs., 3 figs

No abstract available

[en] Preparation of a proposal for the installation of a radioactive beam ISOL facility (ISAC) with a post-accelerator is in progress at TRIUMF. The accelerator specifications call for acceleration of ions with charge to mass ratios greater than 1/60, to energies up to 1.5 MeV/u, in one beamline, and up to 10 MeV/u in a second beamline. The current accelerator concept is a three stage linac with strippers to increase the ion q/A, between stages. The first stage is a RFQ, while the second and third stages are a series of independently driven superconducting quarter-wave resonators, similar to those used for the ATLAS accelerator at ANL, and the post tandem booster at JAERI. Preliminary results of beam dynamics calculations for this accelerator configuration are given

No abstract available

[en] The design, testing and selection of a compact modular injection system for the TR13 cyclotron's externally injected 2 mA H^- ion beam is presented in this paper. Concurrent design techniques, and proto-type evaluation on a 1 MeV test cyclotron are discussed. Key results include comparisons of simulated and measured parameters, beam transmission as a function of injection system rotation angle, and full beam scintillator images in the vicinity of the inflector exit. (author)

[en] A 92 MHz auxiliary accelerating cavity has been installed in the TRIUMF cyclotron. It operates at the fourth harmonic of the dee frequency with a planned peak voltage of 150 kV. At full power it will almost double the present energy gain per turn in the 400-500 MeV range, reducing by 25% the stripping loss of the H^- beam. Low current beam tests have been conducted at voltages of up to 90 kV and a maximum voltage of 145 kV has been attained. The cavity has also been used to flattop the integrated energy gain per turn. A description of the cavity design and a summary of the operating experience is given. (Author) 6 refs., 6 figs

No abstract available