Stability thresholds of first RCS stage for resonator wakefield

• David Amorim (CERN)

How many RF stations do we need in the RCS chain?

• Fabian Batsch (CERN)

Discussion Few open points for follow-up: - Optimize losses in RCS chain for best overall performance, allowing different transmission in the two or three machines - Would two RCS be sufficient to accelerate from 60 GeV to 1.5 TeV? - Cost functions per machine part: could one make an assumption for a cost per unit length of RF (plus some infrastructure cost offset per RF section), idem for unit length of magnets? - Average gradient of RF sections: 30 MV/m - Resistive wall impedance? - Is transition gamma of ~20 a good number for the first RCS stage? - FFA alternative for RCS?

Round table

• Elias Metral (CERN)
• Fabian Batsch (CERN)
• Heiko Damerau (CERN)
• Ivan Karpov (CERN)
• Alexej Grudiev (CERN)
• Antoine Chance (CEA Irfu)
• David Amorim (CERN)