Matching PSBPS M'Benedikt, A'Jansson, M'Giovanozzi, M'Martini, PSB team - PowerPoint PPT Presentation

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

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Very encouraging first results from prototype quadrupolar pick-up in the PS ... Increase the Imean / Ipeak= BF value by creating a hollow distribution in the ... – PowerPoint PPT presentation

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


1
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

2
Qudrupolar pick-up
3
PSB SynchronizationA.Blas, PSB team
  • Longitudinal bunch jitter suppressed
  • Synchronization faster

H1
H2
4
High intensity in PSBM.Chanel, E.Jensen,
G.Cyvoct, PSB team
5
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

6
Instrumentation
  • BeamScope available for emittance measurements!
  • Needs more time after synchronization (before
    ejection) for good measurements
  • Possible with new synchro modules

7
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

8
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.

9
Bucket deposition
10
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
11
Beam transfer functions
H(w)
G(w)
12
Tomograms
13
LHC type beam in PS
  • No transverse blow-up due to bunch flattening
    process
  • Reproducible
  • 10-15 gain in bunching factor

14
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?
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