Linac 4 Week 41 Piotr Skowronski Bettina Mikulec

Linac 4 Week 41 Piotr Skowronski, Bettina Mikulec 1 Facilities Operations Meeting Thursday, February 25, 2021

Week 41 part 1 Ø Tuesday § RF MD to optimise the debuncher settings to allow PPM operation with different energy spreads for the foreseen PSB beam production schemes. § Unfortunately, yesterday debuncher got unstable again Ø Wednesday § Restart of laser emittance meter commissioning by the BI team § Comparative wire scanner and SEM grid measurements. Ø Thursday § Beam interruptions due to PSB MPS DSO tests and Switchyard EIS test mode. § BSM 2 measurements scanning the debuncher amplitude. 2 Facilities Operations Meeting Thursday, February 25, 2021

Week 41 part 2 Ø Friday § ABP/RF/OP tests to prepare energy painting MD • Time-of-flight measurements at debuncher with different PIMS 11/12 amplitudes. Ø Monday § Phasing verifications because Friday’s measurements were 10% off from expectation § Found an issue with phasing • Time-of-flight often publishes the data with 1 or 2 cycle delay • During scans the delay between setting cavity phase and TOF acquisition was not long enough § Phasing adjustment is scheduled for the Friday 3 Facilities Operations Meeting Thursday, February 25, 2021

Other points Throughout the week investigations on the SIS reaction time. Ø Final details implemented for machine critical parameters Ø § FGCs § BLMs § Watchdogs. Ø Another important topic this week were the ppm copy investigations § It is not straight forward to copy the settings due to • Several make-rules involving the beam momentum & POPS/POPS-B equipment • Parameters with different MCS roles § Finally arrived at a working procedure with the help of Michi (thanks!). 4 Facilities Operations Meeting Thursday, February 25, 2021

AFT Ø Availability 96% 5 Facilities Operations Meeting Thursday, February 25, 2021