ABP Injectors WG meeting 27032020 HSS ABP Injectors

ABP Injectors WG meeting 27/03/2020 - HSS ABP Injectors WG - HSS 1

Studies n PSB n n n n Beta-beating correction during injection bump decay: strategy, simulation and operational tool Several discussions carried out with key people. First steps at last IPP meeting. Beta functions at WS position, is there really no hope to measure in operational optics? Any additional effort needed here to explore alternatives? Alternatives are being considered. Post-LS 2 orbit correction tool/strategy Reference measurements Ring-by-ring tune control (knob) definition for OP implementation n n 03/10/2019 Provide optics look-up tables for the tune space of interest This could be part of the new models/knobs Giovanni Rumolo 2

Studies n PS n Improve beating of the optics functions: n n Continue close collaboration with TE-MSC to n n n n improve magnetic model and interface it with the MAD-X model define and follow-up magnetic measurements of the MUs establish and implement degaussing procedures for MTE and slow-extraction multipoles based on magnetic measurements by TE-MSC ABP follow up with TE-MSC. Measurement activities on hold, now. Beta function measurement for injection squeeze for non-LHC beams? Need for correction? Emittance measurements? Not considered for the time being. To be looked at. Tune spread tracker along cycle? (problems in the past from increasing space charge at beginning ramp) Multi-Turn Extraction: n n 03/10/2019 Redistribution of low-energy quadrupoles Study working point control along the cycle with PFW only Activities in progress in ABP Impact of the transverse damper on the horizontal splitting Continue to collaborate with BE-RF to work towards an operational implementation of the barrier bucket scheme Measurements of the optics functions inside the islands ABP collaboration with BE-RF. Fellow in BE-RF would be essential. Ideas for synchronization need experimental validation. Giovanni Rumolo 3

Studies n SPS n Need for beta-beat measurements? n 03/10/2019 Probably not, but the tools should be available. Giovanni Rumolo 4

Studies n Linac 3 + LEIR n n n Any advantages from deploying optics tools for beta-beat measurement/correction in LEIR beside beta function at BGI? We are trying to tackle this aspect with a generic approach, i. e. providing all tools for optics measurements. Across injectors and long term n n n 03/10/2019 Post-LS 2 repositories: optics and JMAD models, aperture models and transverse impedance models On-going effort for single-particle part of models. In some case collaboration with OP (aperture models). Validation of the layout DB entries and MAD-X sequences for the injectors Long-term activity, started with LHC and currently extended to SPS, PSB. AD and ELENA will come after. Establish procedure in collaboration with EN-SMM to base injectors’ alignment on MAD-X survey files In progress, starting from the PS. Coupling measurement and correction? Where should be deployed? Anything to gain? Successfully tested in the PS. Promising option together with ADT to avoid emittance sharing/exchange. Nonlinear modeling of the injectors In progress… Close follow-up of analysis algorithms for BI instruments (especially concerning wire scanners and BGIs) Giovanni Rumolo 5

Studies n General review of optics measurement requirements in terms of excitation means to provide input for decision-making process. 03/10/2019 Giovanni Rumolo 6