FCC-ee Injector Design (CHART proposal) Coordination meeting 17

Thursday 25 Apr 2024, 10:00 → 11:30 Europe/Zurich

Paolo Craievich

10:00 → 10:10 General information, topics for review during FCC Week 2024

Speaker: Paolo Craievich

20240425_WP01_pub.pdf

20240425_WP01_pub.pptx

10:10 → 10:20 Booster ring: parameter table and lower vertical emittance

Speaker: Antoine Chance (CEA)

2024_04_25_booster_parameters.pdf

2024_04_25_booster_parameters.pptx

10:34:47 From Yann Dutheil to Everyone:
    Great idea to overshoot the energy instead of waiting on the flat-top
10:44:37 From Yann Dutheil to Everyone:
    I agree, we are keeping that option for the specs of extraction systems
10:52:47 From Yann Dutheil to Everyone:
    I think we have that opportunity to inject any bunch/train structure in the collider as far as both booster and collider RF can cope. I'm not sure RF confirmed this yet. Someone from ring-RF could confirm ?

10:20 → 10:30 Booster filling scheme

Speaker: Hannes Bartosik (CERN)

You can find the slides here: https://indico.cern.ch/event/1378927/ 

10:30 → 10:40 Transfer line from Injector to BR: energy spread and vacuum chamber aperture

Speakers: Wolfgang Bartmann (CERN), Yann Dutheil (CERN)

• Transfer line from the HE linac to the Booster is in the order of 10 km.
  • Bends in H & V planes, with >90 degrees of bending in horizontal.
  • Reasonable quadrupole strength imposes a FODO cell length of a few 10s of meters and dispersion 2-3 m.
  • Present designs use ~1000 dipoles and ~400 quadrupoles.
• Dispersion in the line is also used for R56 control.
• Geometrical emittance is small -> minor contribution to the required transfer line aperture.
• Strong constraint on energy spread to limit the required aperture around 40mm.
  • Request to limit relative energy spread provided by the HE linac dp/p <= 2.5E-3

10:40 → 10:50 WP1 - e+/e- Injector Linacs

Speaker: Alexej Grudiev (CERN)

20240425_WP1summary.pdf

20240425_WP1summary.pptx

10:50 → 11:00 WP3 - Positron source: FC vs SC solenoids

Speaker: Iryna Chaikovska (CNRS/IJCLab)

WP3_update25042024.pdf

WP3_update25042024.pptx

11:00 → 11:10 WP4 - Damping ring and transfer lines: working strategy and topic definition

Speaker: Ozgur Etisken (Ankara University (TR))

ELEGANT_VS_RF_TRACK.pdf

FCCeeDR_Options_April2024_InjectorMeeting17.pdf

11:10 → 11:20 WP6 - P-cubed project at PSI: status and outlook

Speaker: Nicolas Vallis (PSI/EPFL)

WP6_coordination_meeting_17.pdf

WP6_coordination_meeting_17.pptx

11:20 → 11:30 AOB

Speaker: Paolo Craievich