Jitter in H- 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-μs long pulse was 130 μm in X and 50 μm in Y, and the pulse-to-pulse jitter was 30-50 μm in X and 30-40 μm in Y. At the entrance to the telescope, the beam jitter during a pulse was from 70 μm in X and 160 μm in Y for high current to less than 20 μm for X and Y for low current. The jitter from pulse to pulse varied from 150 to 160 μm in X and 70 to 80 μm in Y for high current and 60 to 70 μm in X and Y for low current