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Suppression of beam losses is essential for successful operation ofhigh-intensity linac. Historically, the values of the field amplitudes andphases of the side-coupled, 805-MHz LANSCE linac modules are maintained using awell-known delta-t tuning procedure. Transverse matching of the beam withaccelerator is performed through adjustments of beam ellipses in 4D phase spacewith accelerator lattice using matching quadrupoles. Control of the beam-energyramp along the length of a proton linear accelerator is required to improvetune of accelerator and decrease beam losses. Time-of-flight measurements ofthe H- beam energy are now being used to confirm and improve the overallcontrol of the energy ramp along the linac. The time-of-flight method utilizesabsolute measurements of beam energy using direct signals from beam at anoscilloscope, as well as the difference in RF phases measured as the beampasses installed delta-t pickup loops. A newly developed BPPM data acquisitionsystem is used. Beam energy measurement along accelerator together with phasescans, klystrons output power control, and delta-t method, allow tuning ofaccelerator much more close to original design and reduce losses generated bylinac. Details of the upgraded tuning procedure and results of tuning andoperation are presented.

Tuning of LANSCE 805-MHz High-Energy Linear Accelerator with Reduced Beam Losses