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PS injection at 2 GeV

PS injection at 2 GeV. W. Bartmann, J. Borburgh, S. Gilardoni, B. Goddard, L. Sermeus, R. Steerenberg PS-LIU meeting, 27-Aug-2013. Aim of the PSB-PS transfer upgrade. All beams to be transferred at 1.4 and 2 GeV (until LS2 also 1.0 GeV in BT and BTM/BTY for ISOLDE)

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PS injection at 2 GeV

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  1. PS injection at 2 GeV W. Bartmann, J. Borburgh, S. Gilardoni, B. Goddard, L. Sermeus, R. Steerenberg PS-LIU meeting, 27-Aug-2013

  2. Aim of the PSB-PS transfer upgrade • All beams to be transferred at 1.4 and 2 GeV (until LS2 also 1.0 GeV in BT and BTM/BTY for ISOLDE) • Septum and kicker strength increased by 30% (Bρ2GeV /Bρ1.4GeV) • Can relax PS injection kicker fall time for LHC beam but not for HI beam • LHC beam can be injected with existing kicker in short-circuit mode with longer fall time • HI beam injection at 2 GeV requires additional kicker in SS53 • Match optics at PS injection to reduce emittance blow-up due to dispersion mismatch • Vertical dispersion remains mismatched due to the vertical displacement of the four PSB rings (Dy < 0.5 m) • Horizontal dispersion is presently not matched; install one additional quadrupole in BTP line to match the line to the PS injection optics • Optimise optics for different beams • Requires ppm capability of HW (i.e. upgrade of BTP) 2 GeV PSB ejection and transfer to the PS

  3. PS injection upgrade • KFA45 • Can be used in short circuit mode to increase kick strength but at the expense of the rise/fall time • Additional kicker in SS53 needed to inject also HI beams at 2 GeV PS injection at 2 GeV

  4. KFA53 • As fast as KFA45 • Delay line type magnets, short circuited • Already bumper in SS53, 730 mm between flanges • Coated ceramic shielding plates • RG220 PFL with 40 kV, higher attenuation than SF6 cables (KFA45)  transmission cable length < 50 m • SF6 would allow to run with one generator in case of failure, not with RG220, market survey to be launched PS injection at 2 GeV

  5. Kicker parameters PS injection at 2 GeV

  6. Septum upgrade • SMH42 • Longer septum taking full SS42 • Bumper to be integrated in vacuum tank • Bumper upgrade to collapse bump in ~half the time to reduce continuous losses and to improve field quality because of eddy current effects for “bumper septum” Eddy current septa: injection septum as well as bumper septum PS injection at 2 GeV

  7. Septum and bumper parameters PS injection at 2 GeV

  8. HW upgrade cost PS injection at 2 GeV

  9. Optics solutions • Match horizontal dispersion to PS injection optics to reduce emittance blow-up • Improve luminosity for LHC beams • Reduce losses in PS for HI beams • Vertical dispersion unavoidably mismatched • Keep it low for all 4 PSB rings • Avoid aperture bottlenecks in the line to be able to fully deploy L4 intensities and above • Mainly relevant for the large emittance beams • Squeeze beams at PS injection • Only for HI large emittance beams • Reduce radiation, equipment aging and beam loss • Have to change PS optics at injection (MD this year) PS injection at 2 GeV

  10. LHC beams – horizontal LHC beam matched to nominal PS injection optics to avoid emittance growth No aperture bottlenecks in the line PS injection at 2 GeV

  11. LHC beams – vertical No aperture bottlenecks in the line PS injection at 2 GeV

  12. HI beams –horizontal HI beam matched to dedicated injection optics to reduce beam losses Aperture for beams to PS in line OK due to smaller beam size at 2 GeV Aperture for ISOLDE beam remains the same PS injection at 2 GeV

  13. HI beams - vertical Aperture in the line looks OK – beam size in injection septum to be checked in MD PS injection at 2 GeV

  14. Injection loss MD 2013 Wrong BTP model, tried to inject a horizontally too big beam: • These settings fit only 1.4 σ beam • 70% measured transmission correspond to 1.55 σ Emittance measured in PS: PS injection at 2 GeV

  15. Conclusion • Solution for injection of all beams at 2 GeV identified • Main changes for HW: • PS injection septum – new design with bumper in vacuum • PS injection kicker KFA53 – new HW • Optics • With additional quadrupole and new arrangement line optics can be matched to PS • Line has flexibility to adapt optics for different needs of LHC and HI beams • MDs required to see if loss improvement justifies new quadrupoles • MD in 2013 used settings from wrong MADX model • The difference in transmission between wrong and correct model corresponds to the measured losses and emittances • Another MD needed after the startup 2 GeV PSB ejection and transfer to the PS

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