Improvements to the beam properties of the TRIUMF cyclotron

Conference · Wed Jun 01 04:00:00 EDT 1977 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:7087301

Craddock, M K ^[1]; Blackmore, E W; Dutto, G; Kost, C J; Mackenzie, G H; Schmor, P

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1. Univ. of British Columbia Vancouver

The behavior of the internal H/sup -/ and external proton beams was considerably improved during the past year. Better steering near the center has resulted in the internal vertical emittance being reduced to 1..pi.. mm-mrad, while the external beam emittances are now 3..pi.. mm-mrad vertically and 3..pi.. mm-mrad horizontally, for 90% of the beam. Digitization of probe data together with computer-aided trim coil tuning has enabled the beam to be centered vertically to within +-6 mm; this has been important in simplifying the simultaneous extraction of two beams at independently variable energies (183 to 520 MeV) and intensities (split-ratios from 1/1 to 1/5000). Beam losses in the cyclotron are <20%; direct evidence is presented for gas and electromagnetic stripping, and also for a loss of a few percent by resonant processes. New techniques were developed to measure the phase and enabled the phase excursions (..delta.. sin phi) to be reduced from +-0.7 to <+-0.2 below 400 MeV. At high energies the phase excursions reach +-0.4, as anticipated from the magnetic field survey. However, a method is proposed by which separated turns could still be achieved and the energy spread reduced to 0.1 MeV, just as in a perfectly isochronous field.

• OSTI ID: 7087301
• Conference Information: Journal Name: IEEE Trans. Nucl. Sci.; (United States) Journal Volume: NS-24:3
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430100* -- Particle Accelerators-- Design
Development
&amp; Operation
ACCELERATORS
ANIONS
BEAM EMITTANCE
BEAM MONITORS
BEAM PRODUCTION
BEAM STRIPPERS
CHARGED PARTICLES
CYCLIC ACCELERATORS
CYCLOTRONS
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
IONS
ISOCHRONOUS CYCLOTRONS
LOSSES
MEASURING INSTRUMENTS
PHASE SHIFT
TRIUMF CYCLOTRON