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

Matching PSB-PS M.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

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

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  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 M.L.

  2. Qudrupolar pick-up M.L.

  3. PSB SynchronizationA.Blas, PSB team • Longitudinal bunch jitter suppressed • Synchronization faster H=1 H=2 M.L.

  4. High intensity in PSBM.Chanel, E.Jensen, G.Cyvoct, PSB team M.L.

  5. 1.4 GeV for ISOLDEG.Cyvoct, M.Lindroos, PSB team • Test beam 1999 • Maximum intensity 2500 10^10 • To reach the nominal 3000 10^10 particles per pulse the transfer between the PSB and ISOLDE has to be re-optimized M.L.

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

  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 M.L.

  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 h=16 frequency control too poor at that time to get proper results. M.L.

  9. Bucket deposition M.L.

  10. Voltage (kV) 8 C02 4 C16 Time (s) 310 315 320 325 330 335 Frequency (kHz) Sweep time C16 frequency 40 kHz Frequency of the “synchronous” particle Time (s) 310 315 320 325 330 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 (h=1) injection M.L.

  11. Beam transfer functions H(w) G(w) M.L.

  12. Tomograms M.L.

  13. LHC type beam in PS • No transverse blow-up due to bunch flattening process • Reproducible • 10-15% gain in bunching factor M.L.

  14. Status of flat bunches • “Flat” LHC type beam produced • reproducible • transferable PSB->PSB • Instability of “hollow bunches” understood • Still to do: • High intensity flat single harmonic bunches • Dual harmonic flat bunches? M.L.

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