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Prospects for Higher p Intensities at CERN R. CAPPI / CERN / 18.10.01

Prospects for Higher p Intensities at CERN R. CAPPI / CERN / 18.10.01. Introduction Main limitations (some of) acceptances vs emittances space-charge 5 t Continuos Transfer Example: double batch injection List of various schemes Conclusion. Introduction.

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Prospects for Higher p Intensities at CERN R. CAPPI / CERN / 18.10.01

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  1. Prospects for Higher p Intensities at CERNR. CAPPI / CERN / 18.10.01 • Introduction • Main limitations (some of) • acceptances vs emittances • space-charge • 5 t Continuos Transfer • Example: double batch injection • List of various schemes • Conclusion

  2. Introduction • a ‘simplified’ summary of the paper: CERN/PS 2001-041 (AE) • which is also a summary of few brainstorming meetings between PS and SPS specialists • trying to answer the question “ is it possible to increase the intensity of the CNGS beam by a factor 2 or 3 ?” • the talk will be mainly devoted to Linac-PSB-PS and CNGS beam oriented • speculations => studies => design • All figures are PRELIMINARY and OPTIMISTIC • I will not talk about collective effects ( xpt. sp. ch.), longit. beam dynamics issues , transition crossing, etc.

  3. Acceptance vs emittance PS acceptance: Ax=60mm, Ay=20mm ex2< 22mm, ey2< 9mm Ex2 Ax limit Ey2 Ay limit

  4. Space charge Self field tune shift To be safe , in the PS: NB:

  5. 5 turn Continuos Transfer It is the way the PS uses to fill the SPS CSPS = 11 x CPS PS PS SPS X’ Present system: + it works - it is lossy (~20%) 2 Q=6.25 3 1 5 X 4 ES blade

  6. Proposal for a new 5t CT The beam is adiabatically captured into 4 islands of a 4th order resonance excited with sextupoles and octupoles. Then it is extracted similarly to the present scheme. + should be less lossy (5%?) - has to be tested experimentally

  7. PSB PS SPS present scenario with associated problems L2 50 MeV Limit Nt = 3.3 ex< 22 ey< 9 1.4 GeV, h<0.9 DQ x,y~ 0.13 ; 0.23 ex= 25 ey= 12 Nt = 3 14 GeV/c; 5t CT ; h=0.8 NB: in these transparencies: 1) ex=4sx2/bx in mm 2) intensities Nt are in 10^13 p 3) h is the transfer efficiency 4) yp is the p flux on target in 10^13p/s Limit X ex= 4.2/3 = 1.4 ey= 2.5 ex< 3 ey< 2 Nt = 4.8 filling time = 1.2s yp = 4.8/6 = 0.8 G = 1

  8. PSB PS SPS Example: double batch injection into PS L2 50 MeV Limit Nt = 2 x 2.4 ex< 22 ey< 9 1.4 GeV; h=1 ex= 21 ey= 9.2 DQ x,y~ 0.21 ; 0.35 Nt = 4.8 => Intensity limit for a PS @ 1.4 GeV 14 GeV/c; old 5t CT;h=0.8 Limit ex= 3.4/3 = 1.13 ey= 1.4 ex< 3 ey< 2 ...2 days ago, in a PS MD, E. and G. Metral et al. have reached 4e13 ppp with moderate losses... Nt = 7.7 filling time = 2.4s yp = 7.7/7.2 = 1.07 G = 1.34 yp = 7.7/6.6 = 1.17 if PSB@.6s, G = 1.46

  9. Table (rev.) of various schemes

  10. Conclusion • a gain of ~1.5 seems feasible though difficult (cost ~0-3MCHF) • a gain of~2 is maybe possible but will be more expensive (~50MCHF) and very difficult • a gain of 3 will be VERY expensive ( ~400MCHF) and almost technically unrealistic • first studies (concerning #1.1, 1.1a and 1.2) are encouraging, but we need clear priorities to continueat efficient speed

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