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Abstract
A new procedure has been developed for automatic longitudinal tuning of a multiple-charge-state heavy-ion beam. It uses a matrix-based code to track the beam centroids and Twiss parameters of the individual charge state beams and a minimization code to minimize a goal function by adjusting the synchronous phases and field levels in the accelerating cavities. The procedure has been successfully tested in the case of the Rare Isotope Accelerator driver linac and proven to improve an original manual tune by significantly reducing beam losses. The procedure was also applied for fast retuning of the linac after one or more cavity failure and restoring the beam with limited beam loss.
Highlights
Beam losses were observed in the highsection of the ECL design while no losses were observed for the TSL design even for the highest error amplitudes
After presenting the formalism for the transport of a multiple-charge-state beam we describe the automatic longitudinal tuning procedure in Sec
As a test and first application of the automatic tuning procedure we used it to see if we can improve the manually obtained tune used in our error simulations and beam loss analysis [1]
Summary
The two design options are the original ‘‘baseline’’ design (ECL) and the alternative ‘‘triple-spoke’’ design (TSL) They differ mainly by the type of cavities used in the highsection of the linac. In the TSL design, the recently developed and successfully tested triple-spoke cavities [2,3] replace the elliptical-cell cavities [4] used in the ECL design. The simulations for both designs were performed for a multiple-charge-state uranium beam using the recently developed beam dynamics code TRACK [5]. A thorough beam loss analysis has been performed showing that the ECL design is less tolerant to rf field errors and to fluctuations in the stripper thickness. We here focus on the ECL design and attempt to develop tunes that significantly reduce beam losses
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