Abstract

Vertical collective beam instability occurs during 8 GeV injection into the NAL main accelerator with an intensity threshold of approximately 10 12 protons and a tune spread of 0.01. Horizontal collective instability has been observed at 5 × 10 12 protons with a 0.01 tune spread. Sextupole, octupole, and active feedback damping have been used to control these instabilities. A brief description of these methods and the results obtained is given.

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