A Shared Superconducting Linac for Protons and Muons

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A Shared Superconducting Linac for Protons and Muons

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1. Rol 8/29/2006 NuFact06 1 A Shared Superconducting Linac for Protons and Muons Advances in muon cooling imply that a muon beam can be accelerated in high-frequency SC RF. A Greenfield neutrino factory can use this capability so the proton driver and muon RLA use the same Linacs. High intensity comes by increasing the rep rate. We comment on the status of related muon cooling research. Invitation to the 2nd annual LEMC workshop Feb. 12-16, 2007 Papers and presentations can be found at http://muonsinc.com

2. Rol 8/29/2006 NuFact06 2 Neutrinos from an 8 GeV SC Linac

3. Rol 8/29/2006 NuFact06 3 Muon Collider use of 8 GeV SC Linac

4. Rol 8/29/2006 NuFact06 4 Greenfield proton/muon accelerator

5. Rol 8/29/2006 NuFact06 5 Features of the Shared HF Linac Depends on effective 6D muon cooling Cooling and adiabatic damping make the muon beam emittance match the Linac acceptance Aligns MC and NF R&D Reduces costs of PD, muon RLA, storage ring Goal is to show savings more than pay for muon cooling Double duty design FODO Linac needed for 7 passes Radius of arcs set by H- stripping limit ~5.5 GeV Proton energy for best captured µ/p per Watt Increase rep rate for more neutrinos, easier targetry e.g. 60Hz SNS at 800MHz

6. Rol 8/29/2006 NuFact06 6

7. Rol 8/29/2006 NuFact06 7

8. Rol 8/29/2006 NuFact06 8 Greenfield muon Production and Cooling (showing approximate lengths of sections) 5.5 GeV Proton storage ring, loaded by Linac 2 T average implies radius=8000/30x20~14m Pi/mu Production Target, Capture, Precool sections 100 m (with HP RF, maybe phase rotation) 6D HCC cooling, ending with 50 T magnets 200 m (HP GH2 RF or LH2 HCC and SCRF) Parametric-resonance Ionization Cooling 100 m Reverse Emittance Exchange (1st stage) 100 m Acceleration to 2.5 GeV 100 m at 25 MeV/c accelerating gradient Reverse Emittance Exchange (2nd stage) 100 m Inject into Proton Driver Linac Total effect: Initial 40,000 mm-mr reduced to 2 mm-mr in each transverse plane Initial ±25% ?p/p reduced to 2% , then increased exchange for transverse reduction and coalescing about 1/3 of muons lost to decay during this 700 m cooling sequence Then recirculate to 30 GeV, inject into racetrack NF storage ring

9. Rol 8/29/2006 NuFact06 9 HPRF Test Cell Measurements in the MTA

10. Rol 8/29/2006 NuFact06 10 Technology Development in Technical Division HTS at LH2 shown, in LHe much better

11. Rol 8/29/2006 NuFact06 11 50 Tesla HTS Magnets for Beam Cooling S.A. Kahn et al., EPAC06 Edinburgh We plan to use high field solenoid magnets in the near final stages of cooling. The need for a high field can be seen by examining the formula for equilibrium emittance: The figure on the right shows a lattice for a 15 T alternating solenoid scheme previously studied.

12. Rol 8/29/2006 NuFact06 12 6-Dimensional Cooling in a Continuous Absorber see Derbenev, Yonehara, Johnson Helical cooling channel (HCC) Continuous absorber for emittance exchange Solenoidal, transverse helical dipole and quadrupole fields Helical dipoles known from Siberian Snakes z-independent Hamiltonian Derbenev & Johnson, Theory of HCC, April/05 PRST-AB

13. Rol 8/29/2006 NuFact06 13 Particle motion in HCC

14. Rol 8/29/2006 NuFact06 14

15. Rol 8/29/2006 NuFact06 15 Parametric-resonance Ionization Cooling Excite ˝ integer parametric resonance (in Linac or ring) Like vertical rigid pendulum or ˝-integer extraction Elliptical phase space motion becomes hyperbolic Use xx’=const to reduce x, increase x’ Use IC to reduce x’ Detuning issues being addressed (chromatic and spherical aberrations, space-charge tune spread). Simulations underway. New progress by Derbenev.

16. Rol 8/29/2006 NuFact06 16 Reverse Emittance Exchange, Coalescing Y.Derbenev & R. P. Johnson, EPAC06, Edinburgh p(cooling)=100MeV/c, p(colliding)=2.5 TeV/c => room in ?p/p space Shrink the transverse dimensions of a muon beam to increase the luminosity of a muon collider using wedge absorbers 20 GeV Bunch coalescing in a ring a new idea for ph II Neutrino factory and muon collider now have a common path

17. Rol 8/29/2006 NuFact06 17

18. Rol 8/29/2006 NuFact06 18 6DMANX demonstration experiment Muon Collider And Neutrino Factory eXperiment To Demonstrate Longitudinal cooling 6D cooling in cont. absorber Prototype precooler Helical Cooling Channel Alternate to continuous RF 5.5^8 ~ 10^6 6D emittance reduction with 8 HCC sections of absorber alternating with (SC?)RF sections. New technology

19. Rol 8/29/2006 NuFact06 19 6DMANX Design

20. Rol 8/29/2006 NuFact06 20 Using tilted or offset coils New methods to produce the HCC fields (Kashikhin & Yonehara) b (dipole component) and bz are reproduced, but additional quadrupole component must be added r=0.25 m, length=0.05 m, 18 coils/m in his simulation

21. Rol 8/29/2006 NuFact06 21 Possible MANX magnet designs V. Kashikhin et al., ASC2006, Seattle

22. Rol 8/29/2006 NuFact06 22 Emittance evolution in LHe HCC

23. Rol 8/29/2006 NuFact06 23 LHe MANX Summary Maximum field can be less than 5.5 T at coils with traditional HCC or with tilted or offset magnet designs Cooling factor is ~400%. Studying matching of emittance between MANX and spectrometers. Good solution found! Preparing MANX proposal. New grant. Really great opportunity for HEP people to get involved. Maybe use spectrometers stored in meson lab.

24. Rol 8/29/2006 NuFact06 24 PARTICIPANTS: 65

25. Rol 8/29/2006 NuFact06 25 Next Steps (please join in!) 6DMANX Experiment: Muon beam line possibilities at FNAL or RAL Magnet designs (good solution found), cost estimates Solve matching problem (solution found) Spectrometer design, experimental resolution, significance (G4MANX) High Pressure RF Experiment: MTA beam line for final proof of principle Breakdown theory, Max Gradient vs f for HPRF Muon Collider: IR Design and Beam-Beam Simulations Pursue LEMC designs, what can go on the Fermilab site? Technology Development HTS high-field magnets, low T RF cavities, high power RF sources More Innovations!

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