Design report of the laser system for notching H- beam at booster injection RF frequency in the 750-keV Linac

With the requirement for more protons per hour from Booster, the radiation is a limiting factor. The most important periods in a Booster accelerating cycle are injection and transition crossing. The laser notching H{sup -} beam at the Booster injection RF frequency can make a bucket-to-bucket transfer from Linac to Booster possible, and this should remove most of the capture loss at injection and the early beam loss in the cycle. Besides that, the variation of the laser pulse length can change the notch length of the H{sup -} beam such that the bucket area filled by the beam can be controlled, and this can be applied to control the longitudinal emittance of the Booster beam.