TUM1CIO02
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
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TUM1CIO02 |
Latest Performance of the 500 MeV H− Cyclotron and Recent Progress Towards Three Simultaneous RIBs at TRIUMF | |
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| The TRIUMF cyclotron has been operating over the last 35 years with total H¯ beam intensity increasing gradually from 100 to 300 μA cw. Simultaneous extraction of three proton beams at different energies up to 500 MeV has been provided routinely with ~90% reliability. One of the beams is sent to ISOL facility to drive the ISAC RIB program. This year the Laboratory has commenced a new development plan funded through a 5-year fiscal cycle. The plan calls for an additional source of RIB generated through photo-fission by a 50 MeV electron beam from a 500 kW cw superconducting linac. In the following phase a second high intensity proton beam will be extracted from the cyclotron and directed with the electron beam towards a new ISAC target complex geared to handle actinide targets. A versatile system of mass spectrometers and an expanded ion linac accelerator structure, to be completed during 2014-2018, would then deliver simultaneously three different RIB's to the existing experimental areas, enhancing scientific productivity of the Laboratory. At the same time the cyclotron will be upgraded to accelerate beams up to 400 μA, with more than 300 μA reaching 500 MeV. | ||
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Slides TUM1CIO02 [3.523 MB] | |
| TUM1CCO03 | Reliable Production of Multiple High Intensity Beams with the 500 MeV TRIUMF Cyclotron | 280 |
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| In 2001, after 25 years of smooth cyclotron operation with up to ~200 μA H¯ acceleration, developments towards higher intensities became compelling because of the ISAC expansion. Recently average current of 300 μA, within a nominal ~90% duty cycle, was routinely achieved. Beam availability was 90-94% over the last five years. Development highlights are discussed in the paper. These include: ion source and beam transport re-optimized for this cyclotron acceptance; the 12 m long vertical injection line section was redesigned to accommodate higher space charge. In the centre region, a water cooled beam scraper was installed to absorb unwanted phases; other electrodes were realigned. Other activities were aimed at beam stability enhancement for ISAC. This included: reducing νr = 3/2 resonance effects at 420 MeV, stabilizing the intensity of the primary beam through pulser feedback regulation and improving beam quality at the target through beam optics optimization and target position stability feedback, etc. Extraction was also improved, using special stripping foils. | ||
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Slides TUM1CCO03 [1.882 MB] | |