Matching PSBPS M'Benedikt, A'Jansson, M'Giovanozzi, M'Martini, PSB team

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Matching PSB-PSM.Benedikt, A.Jansson,
M.Giovanozzi, M.Martini, PSB team

• New better dispersion matched optics tested
• Theory and experiment agree to first order
  (emittance?)
• Conceptual design for betatron matching of the
  four PSB rings with a single quadrupole on ring 1
  and 2
• Draft note ready
• Design for quadrupole complete
• Very encouraging first results from prototype
  quadrupolar pick-up in the PS
• Design of final pick-up started
• Dedicated matching MD needed

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Qudrupolar pick-up
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PSB SynchronizationA.Blas, PSB team

• Longitudinal bunch jitter suppressed
• Synchronization faster

H1
H2
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High intensity in PSBM.Chanel, E.Jensen,
G.Cyvoct, PSB team
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1.4 GeV for ISOLDEG.Cyvoct, M.Lindroos, PSB team

• Test beam 1999
• Maximum intensity 2500 1010
• To reach the nominal 3000 1010 particles per
  pulse the transfer between the PSB and ISOLDE has
  to be re-optimized

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Instrumentation

• BeamScope available for emittance measurements!
• Needs more time after synchronization (before
  ejection) for good measurements
• Possible with new synchro modules

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Hollow bunchesA. Blas, S. Hancock, S.
Koscielniak, M. Lindroos, F. Pedersen, H.
Schonauer, M.Sjöström, PSB Team

• Why to improve space charge related problems.
• How Increase the Imean / Ipeak BF value by
  creating a hollow distribution in the
  longitudinal phase space
• Objective July 99 Reproducible and stable flat
  LHC type bunch

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Hollow bunches (history)

• F. Pedersen (PSB 1978) h 5 bucket deposit in a
  50 MeV coasting beam and acceleration with h 5
  and 7.1010 p (no fast FB!) .
• K. Schindl (PSB 1978) Use of dual harmonic
  debuncher in the Linac transfer line
• Results loss of hollowness when closing any
  loop. Abandoned because of the success of dual
  harmonic (h5 h10) operation.
• R. Garoby, S. Hancock (PS 1992) Phase shaking at
  0.94 fS and homogenization with 200 MHz cavity.
  Very successful from 1GeV to 26 GeV trough
  transition.
• S. Hancock (PSB 1997) same method as above, but
  h16 frequency control too poor at that time to
  get proper results.

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Bucket deposition
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Bucket deposition (rf set-up)

• An empty bucket is brought into the injected
  beam before capture
• C16 cavity for hole-generation
• C02 cavity for acceleration (h1)

injection
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Beam transfer functions
H(w)
G(w)
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Tomograms
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LHC type beam in PS

• No transverse blow-up due to bunch flattening
  process
• Reproducible
• 10-15 gain in bunching factor

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Status of flat bunches

• Flat LHC type beam produced
• reproducible
• transferable PSB-gtPSB
• Instability of hollow bunches understood
• Still to do
• High intensity flat single harmonic bunches
• Dual harmonic flat bunches?