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TRIUMF brown reports TRI-70-3

TRIUMF

A conceptual design for a negative hydrogen ion injection system for the TRIUMF negative ion cyclotron is presented. This system provides ions at an energy of 300 keV in pulses of suitable duration and frequency for acceleration by the cyclotron. Average beam currents in excess of 1000 μA are expected when pulses of 7 nsec are injected. Peak intensities of up to 10 mA are expected for pulses of less than 1 nsec. The design incorporates an Ehlers type ion source held at a 300 keV potential by a very well-regulated Cockcroft-Walton rectifier. The accelerated ions are transported in a system utilizing electrostatic quadrupoles and achromatic bending systems to maintain the time structure of the beam pulses. Chopping and bunching are controlled at cyclotron frequency. The phase angle is adjusted for the correct beam arrival at the cyclotron accelerating gap. The beam is transported from a separate ion source room over the top of the cyclotron shielding and then down the axis of the cyclotron to the inflector near the cyclotron median plane. Stray fields of over 40 G are expected. Magnetic shielding will be required.

Report

eng

Vancouver : University of British Columbia Library

10.14288/1.0107852

TRIUMF

Researcher

http://creativecommons.org/licenses/by-nc-nd/2.5/ca/