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SPL-based Proton Driver for  Facilities at CERN: Updated Description

SPL-based Proton Driver for  Facilities at CERN: Updated Description. C.R. Prior for R. Garoby, F. Gerigk and the SPL study group ISS meeting, 23-25.1.06. Outline. Re-design of the SPL Applications Staged construction SPL beam characteristics Scenarios for accumulation and compression

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SPL-based Proton Driver for  Facilities at CERN: Updated Description

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  1. SPL-based Proton Driver for Facilities at CERN:Updated Description C.R. Prior for R. Garoby, F. Gerigk and the SPL study group ISS meeting, 23-25.1.06 SPL-based Proton Driver for  Facilities

  2. Outline • Re-design of the SPL • Applications • Staged construction • SPL beam characteristics • Scenarios for accumulation and compression • Conclusions & outlook SPL-based Proton Driver for  Facilities

  3. 1. Re-design of the SPL (2005/6) SC technology has progressed a lot 352.2 MHz LEP RF equipment SC cavities, 1MW CW klystrons SPL CDR1 2000 CERN neutrino factory design 2.2 GeV target Optimum energy is higher progress in bulk Nb SC technology 4x accel.grad., pulsed 4-5 MW klystrons SPL CDR2 2006 designed for multiple users -beam, superbeam, , EURISOL, PS II SPL-based Proton Driver for  Facilities

  4. 2. Applications SC linac replacing the 40 yearsold PS booster (1.4 GeV) 5 MW driver for EURISOL [0.2 – 5 MW beam @ 1-2 GeV] n facility based on: • beta-beam [200 kW beam @ 1-5 GeV] • + • super-beam LHC upgrade [proton beams with  2x brightness] or -  factory based on m decay [4 MW @ 4 - 10 GeV] Þ Major upgrade of the proton injector complex at CERN [ performance:  2x higher brightness + reliability] for the benefit of all users (LHC, fixed target etc.) Þ Cost-effective time sharing between nuclear [ISOL] and  applications Þ Potential for future increases in energy and/or power SPL-based Proton Driver for  Facilities

  5. 3. Staged construction (1/5) halo monitor 3 MeV test stand (beam in 2008) IPHI RFQ (CEA) chopper in quadrupole buncher cavity SPL-based Proton Driver for  Facilities

  6. 3. Staged construction (2/5) low duty cycle: 0.08% Linac4 (beam in 2010) IN2P3, BINP, CEA, VNIITEF ITEP Moscow & VNIIEF Sarov & IN2P3 BINP Novosibirsk & VNIITEF Snezinsk SPL-based Proton Driver for  Facilities

  7. 3. Staged construction (3/5) SPL (beam in 2015 ?) • relocation of Linac4, adding 366 m of SC RF, • PS booster becomes obsolete, • cavity power < 1 MW, • TESLA/ILC type cryostats (INFN Milano) with • 5-cell SC Nb cavities (CEA/INFN) and cold • quadrupoles, • layout and beam dynamics (CEA Saclay). SPL-based Proton Driver for  Facilities

  8. 3. Staged construction (4/5) SPL-based Proton Driver for  Facilities

  9. 3. Staged construction (5/5) Beam dynamics (CEA Saclay) beam envelopes output phase space phase advance per metre emittance evolution SPL-based Proton Driver for  Facilities

  10. 4. SPL beam characteristics * after chopping SPL-based Proton Driver for  Facilities

  11. 5. Scenarios for accumulation & compression (1/7) For n physics, the time structure of the linac beam has to be changed: Long beam burst (~ms) Þdirect use of linac beam - for a beta-beam basedfacility [200 kW beam @ 1-5 GeV] + super-beam [4 MW @ 3.5 GeV] Short beam burst (~ms) Þaccumulator Short beam burst (~ms) Þaccumulator + Short bunches (~ns) Þcompressor - for an factory [4 MW beam @ 4-10 GeV] The requirements of a n factory are the most demanding. SPL-based Proton Driver for  Facilities

  12. 5. Scenarios for accumulation & compression (2/7) Parameters required by a n factory* * As estimated today SPL-based Proton Driver for  Facilities

  13. 5. Scenarios for accumulation & compression (3/7) Consequences for a linac-based driver SPL-based Proton Driver for  Facilities

  14. 5. Scenarios for accumulation & compression (4/7) With SPL CDR1 (2000): severe constraint due to the low beam energy SPL-based Proton Driver for  Facilities

  15. 5. Scenarios for accumulation & compression (5/7) With SPL CDR2 (2006): higher beam energy => less constraints Aggressive approach… Study is going on to check feasibility… SPL-based Proton Driver for  Facilities

  16. 5. Scenarios for accumulation & compression (6/7) • With a linac-based driver there is the possibility to do multiple accumulations with a single linac beam pulse, and therefore generate multiple bursts of beam onto the target. • This is of interest if: • all parameters are constant in the m channel during the whole duration of the proton beam on the target (transverse focusing, gradient in the RF cavities…). It is not unreasonable to hope for ~ 1 ms. • the m storage ring is long enough to contain all the successive bursts. • The main disadvantage is that the kickers must provide multiple kicks within ~ 1 ms. • This makes it possible to tailor the intensity per burst / the distance between bunches / the main cycling rate of whole facility… SPL-based Proton Driver for  Facilities

  17. 5. Scenarios for accumulation & compression (7/7) With SPL CDR2 (2006): other approach using multi-pulsing If the first set of parameters is unfeasible: pulse twice the accumulator/compressor If the first set of parameters is feasible: pulse twice the accumulator/compressor and divide frep by 2 SPL-based Proton Driver for  Facilities

  18. 6. Conclusions & outlook The new SPL design (CDR2 – 2006) is largely improved: • energy (3.5 GeV) is a compromise that can potentially satisfy EURISOL, neutrino applications, and LHC upgrade scenarios, • design is more optimum (length reduced by 35% while the energy is increased by 60%, higher instantaneous current reducing the number of turns for accumulation in the ring…) • upgrades are possible in terms of energy and/or power. This typically illustrates the potential of a linac-based proton driver for a n factory, which has an unmatchable flexibility to adapt to the requirements of the following part of the facility. SPL-based Proton Driver for  Facilities

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