First Beam Test with the ISAC RFQ

The ISAC RFQ is a 35 MHz, split-ring, four vane structure designed to accelerate ions of A=q 30 from 2 keV/u to 150 keV/u in cw mode. When completed the RFQ will comprise 19 split rings and modulated electrodes in quadrature for a total length of about 8 m. The first 7-ring portion of the RFQ is being tested with beam in an interim configuration. A copper wall internal to the RFQ tank isolates the rf power to the electrode region. Electrostatic quadrupoles are installed in the remainder of the tank to transport the beam to a downstream diagnostic station. An injector composed of an ion source and an electrostatic LEBT and matching section delivers stable light ions to the RFQ. The beam is pre-bunched with an 11.7 MHz pseudo saw-tooth waveform across a single gap. The diagnostic station consists of Faraday cups, a fast Faraday cup, an emittance rig, and an analyzing magnet. The complete test set-up will be described and the results of commissioning the injector and testing the RFQ will be presented.

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