Successful Beam-Beam Compensation with TEL1 Vsevolod Kamerdzhiev for Beam-Beam Compensation team

V. Kamerdzhiev for BBC teamAPD meeting, May 30, First BoS beam study with TEL1 #5352 TEL1 on P13

V. Kamerdzhiev for BBC teamAPD meeting, May 30, First BoS beam study with TEL1 #5352

V. Kamerdzhiev for BBC teamAPD meeting, May 30, TEL1 on/off, #5352 T1 T2 status P1 P13 P25 P

V. Kamerdzhiev for BBC teamAPD meeting, May 30, BoS #5353

V. Kamerdzhiev for BBC teamAPD meeting, May 30, TEL1 horizontal tune shift

V. Kamerdzhiev for BBC teamAPD meeting, May 30, TEL1 horizontal tune shift

V. Kamerdzhiev for BBC teamAPD meeting, May 30, TEL1 horizontal tune shift problem with the baseline

V. Kamerdzhiev for BBC teamAPD meeting, May 30, Bunch length, #5359

V. Kamerdzhiev for BBC teamAPD meeting, May 30, Bunch length, #5359

V. Kamerdzhiev for BBC teamAPD meeting, May 30, P1 tau, #5359

V. Kamerdzhiev for BBC teamAPD meeting, May 30, P13 tau, #5359

V. Kamerdzhiev for BBC teamAPD meeting, May 30, P25 tau, #5359

V. Kamerdzhiev for BBC teamAPD meeting, May 30, Tau improvements, #5359 P1 ~25%, ~40% P13~20%, ~40% P25~30%

V. Kamerdzhiev for BBC teamAPD meeting, May 30, Horizontal scan, #5467

V. Kamerdzhiev for BBC teamAPD meeting, May 30, Tunes, #5467

V. Kamerdzhiev for BBC teamAPD meeting, May 30, Study plan BBCompensation during scraping Both TELs simultaneously on one bunch TEL1 tune shift vs TEV tune change Increase e-beam size Study the effects on emittance growth Bunch length vs lifetime improvement Losses and Schottky power vs e-noise

V. Kamerdzhiev for BBC teamAPD meeting, May 30, Summary We used TEL1 for beam-beam compensation of a single proton bunch. Repeatable lifetime improvement in the range of 15-65% has been demonstrated Position scans suggest no harmful effects of horizontally displaced e-beam on protons (preliminary) Based on the latest data we decided NOT to upgrade TEL1 magnetic system