LIU-PS Beam Dynamics Working Group Introduction and objectives 23/08/2017 H. Damerau, A. Huschauer, A. Lasheen

Introduction Reliably double intensity of 25 ns spacing beam for LHC LIU/HL-LHC projects set demanding beam parameters for the PS after LS2 Reliably double intensity of 25 ns spacing beam for LHC Initial set of studies to define baseline upgrades, < 2014 1.4 GeV  2 GeV injection reducing space charge RF upgrades: Local 1-turn delay and global feedbacks 2014 – 2016: Refined MD studies Difficult to reach beam parameters with baseline upgrades From 2016: Ramping up studies again: MDs, simulations, impedance model Additional ideas beyond LIU baseline to be scrutinized

Introduction Objectives: LIU baseline parameters/HL-LHC request, standard Parameter Achieved Injection Intensity per bunch (total: 2 · 1013 ppp) 3.3 1012 ppb (12  2.7 1011) Injection energy, Ekin 2.0 GeV 1.4 GeV Transverse emittances 1.8 mm Longitudinal emittance 3.0 eVs PS Beam loss 5% Transverse emittance growth Controlled longitudinal blow-up ~50% Space charge tune shift, DQy -0.3 Ejection Intensity per bunch 2.6 1011 ppb 2.0 1011 ppb 1.9 mm > 2 mm 0.35 Bunch length 4 ns https://edms.cern.ch/project/LIU-000433

Introduction Objectives: LIU baseline parameters/HL-LHC request, standard Parameter Achieved Injection Intensity per bunch (total: 2 · 1013 ppp) 3.3 1012 ppb (12  2.7 1011) Injection energy, Ekin 2.0 GeV 1.4 GeV Transverse emittances 1.8 mm Longitudinal emittance 3.0 eVs PS Beam loss 5% Transverse emittance growth Controlled longitudinal blow-up ~50% Space charge tune shift, DQy -0.3 Ejection Intensity per bunch 2.6 1011 ppb 1.9 mm >> 2 mm 0.35 0.45…0.5 eVs Bunch length 4 ns 4.5…5 ns https://edms.cern.ch/project/LIU-000433

Introduction Objectives: LIU baseline parameters/HL-LHC request, BCMS Achieved Injection Intensity per bunch (total: 2 · 1013 ppp) 1.63 1012 ppb (6  2.7 1011) Injection energy, Ekin 2.0 GeV 1.4 GeV Transverse emittances 1.2 mm Longitudinal emittance 1.5 eVs PS Beam loss 5% Transverse emittance growth Controlled longitudinal blow-up ~50% Space charge tune shift, DQy -0.31 Ejection Intensity per bunch 2.6 1011 ppb 1.7 1011 ppb 1.9 mm ~2 mm 0.35 Bunch length 4 ns https://edms.cern.ch/project/LIU-000433

Objectives of the new working group Discuss measurements, calculations and simulations for all beam dynamics issues relevant to LHC-type beams in the PS Focus on work in progress, ongoing MD studies, e.g., Beam stability and bunch rotation Space charge, sources of uncontrolled emittance growth Large longitudinal emittance Impedance model (longitudinal/transverse) … Agree on priorities for further studies Interface between beam dynamics and hardware issues Define needs from equipment for further studies, e.g., special mode of operation for cavities or kickers Suggest improvements and recommend their implementation Report back to LIU-PS Coordination meeting (K. Hanke)

Practical issues Meeting to take place according to needs, about four-weekly Mixed subjects: longitudinal and transverse 3-4 short presentations per meeting Discussions should be the most important part Open to everybody, participation according to subjects Please forward invitation to interested colleagues Potential slot for regular meeting: Tuesday, 16h00 in parallel to LIU-PSB meeting Thursday, 10h15 Thursday, 16h00 alternating with LIU-SPS BD WG Friday, 14h00 alternating with MSWG