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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
Reverse Emittance Exchange (1st stage)
Acceleration to 2.5 GeV
100 m at 25 MeV/c accelerating gradient
Reverse Emittance Exchange (2nd stage)
Inject into Proton Driver Linac
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
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
6D cooling in cont. absorber
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.
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
IR Design and Beam-Beam Simulations
Pursue LEMC designs, what can go on the Fermilab site?
HTS high-field magnets, low T RF cavities, high power RF sources