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FCCee beam transfer meeting #6

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Participants: 
A. Abramov, K. André, P. Arrutia, M. Boland, C. Bracco, C. Carli, Y. Dutheil, T. Kramer, A. Lechner, P. Martinek, G. Roy, A. Vanel, S. Yue

 

FCC top-up injection with thick septa (S. Yue)

  • A new injection lattice is found to use magnetic septa (thicker)
  • Possible optimization for injection
    • Reduce horizontal size of injected beam (emittance H/V exchange or just horizontal optics)
    • Decrease energy spread to fit in the DA longitudinal bucket controur
  • Stripline kicker is used to produce a one turn fast bump (304 us),
    • Rises and falls in the abort gap
  • New optics needs evaluating
    • optics repo features CI to compute DA, G. Roy can be contacted about this
    • Sen to create a new branch and update the lattice with injection optics
  • longitudinal parameters
    • Presently longitudinal parameters matched to the collider equilibirum are not optimal for on-axis injection
    • Booster beam need to fit the collider injection requirements
    • Needs to be discussed with the booster and RF teams
  • Machine protection concers
    • Will be oversaw by Chiara
    • Present concept is to split the maximum Booster load into 10 cunks, separated by 100ms
    • 1/10th of maximum Bosster current may be absorbed by a collimator
    • If the booster maximum current was reduced by 10, there could be benefice to the booster design
  • The circumference of collider and booster should be same
    • Kevin will check with Frank and Antoine to ensure this is agreed
  • Based on present lattice in booster ring, the SR is not considered
    • In tt operation mode, the beam will lose ~ 10% energy in each turn
    • For tapering, the magnet in arc will be ramped up/down at different levels for e+/e-
  • PB integration
    • will contain booster->collider transfer
    • Also contains collider dump and investigating beam dynamics and positionning to reuse it for the booster dump
    • Distance beamline-dump needs to be reviewed (S. Yue)

 

Full energy booster systems timeline (Y. Dutheil)

  • The deadline for FCCIS report on booster design is June 2024 
  • There are collider/booster dump, collider injection and booster extraction systems in straight section (PB)
    • Need more discussion about integrated systems and related transfer lines
    • The transfer line between booster extraction and collider injection is ~ 200m.
    • Upload the injection lattice to the repository to check the feasibility of system integration

Discussion

  • CLS linac upgrade
    • Present schedule aims at beam commisioing in the later part of the summer
    • CERN colleagues are invited to join the beam commissioing of the new linac
  • P. Hunchkak continuing PhD on MAD-NG modelling of RDTs for FCC with ABP team
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