10th meeting on HEMAC discussions

Tuesday 20 Sept 2022, 16:45 → 17:30 Europe/Zurich

Zoom

https://cern.zoom.us/j/66586421590?pwd=TVZ4WEdtaDRQNFBkNitUTm4rTG83Zz09

RCS chain parameter table, 20/09/2022

1 RF for RCS: Update on adiabaticy and emittance growth

Speaker: Fabian Batsch (CERN)

MC_HEMAC_FB_220920.pdf

MC_HEMAC_FB_220920.pptx

2 Transverse shunt impedance of TESLA/ILC cavities

Speakers: Alexej Grudiev (CERN), Dr David Amorim (CERN), Elias Metral (CERN)

3 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
- Acceptable longitudinal emittance growth in the RCS chain and how to quantify it exactly?
- 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?

4 Round table

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

2022-09-19_MUC_design_materials_resistivity.pdf