Title: Matching PSBPS M'Benedikt, A'Jansson, M'Giovanozzi, M'Martini, PSB team
1Matching 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
2Qudrupolar pick-up
3PSB SynchronizationA.Blas, PSB team
- Longitudinal bunch jitter suppressed
- Synchronization faster
H1
H2
4High intensity in PSBM.Chanel, E.Jensen,
G.Cyvoct, PSB team
51.4 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
6Instrumentation
- BeamScope available for emittance measurements!
- Needs more time after synchronization (before
ejection) for good measurements - Possible with new synchro modules
7Hollow 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
8Hollow 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.
9Bucket deposition
10Bucket 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
11Beam transfer functions
H(w)
G(w)
12Tomograms
13LHC type beam in PS
- No transverse blow-up due to bunch flattening
process - Reproducible
- 10-15 gain in bunching factor
14Status 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?