Jitter in H/sup -/ beam position at Neutral Particle Beam Test Stand

Measurements of the time variation of beam position (jitter) during a single pulse and from pulse to pulse were made at various locations in the Neutral Particle Beam Test Stand using five directional coupler (stripline) beam position monitors developed by Los Alamos National Laboratory. The average measured beam jitter at the linac exit during a 100- mu s long pulse was 130 mu m in X and 50 mu m in Y, and the pulse-to-pulse jitter was 30-50 mu m in X and 30-40 mu m in Y. At the entrance to the telescope, the beam jitter during a pulse was from 70 mu m in X and 160 mu m in Y for high current to less than 20 mu m for X and Y for low current. The jitter from pulse to pulse varied from 150 to 160 mu m in X and 70 to 80 mu m in Y for high current and 60 to 70 mu m in X and Y for low current.<
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