Speaker
Description
Particle beams in accelerators exhibit temporal structures from picoseconds to milliseconds, reflecting processes of generation, capture, acceleration, and stabilization. At the SNS linac, the H⁻ beam displays a hierarchical time structure governed by RF phase stability, beam chopping, and pulsed operation. Bunch-resolved measurements enable detailed studies of transient beam dynamics and support model validation for beam loss mitigation.
We demonstrate bunch-selective diagnostics using a laser wire system driven by picosecond pulses. The laser pulse structure and timing are precisely tailored to probe individual H⁻ bunches at selected locations within a macropulse or mini-pulse using a single laser pulse. Combined with a laser comb technique, transverse and longitudinal profiles of multiple bunches are acquired simultaneously in a single scan. This approach enables high-precision characterization of intra–mini-pulse beam evolution, revealing fine temporal structures beyond conventional diagnostics. System implementation and measurement performance are presented.
Footnotes
Y. Liu et. al., “Nonintrusive measurement of time-resolved emittances of 1-GeV operational hydrogen ion beam using a laser comb,” DOI: https://doi.org/10.1103/PhysRevAccelBeams.23.102806.
Y. Liu et. al., “Longitudinal bunch profile measurement of operational H- beam using laser wire and virtual slit,” DOI: 10.1103/PhysRevAccelBeams.26.042801.
Funding Agency
ORNL is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy.
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