Frictional Cooling. Columbia University & the Max-Planck-Institute. R. Galea, A. Caldwell, S.Schlenstedt, H. Abramowicz. What is Frictional Cooling (FC)? Simulation of the frontend of a Muon Collider based on FC Targetry & Capture Magnet Drift Region Phase Rotation Cooling section
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Columbia University & the Max-Planck-Institute
R. Galea, A. Caldwell, S.Schlenstedt, H. Abramowicz
2004 Workshop on Muon Collider Simulation
Nuclear scattering, atomic excitation, charge exchange…
muon too slow to ionize
1/2 from ionization
At high energy end change is only logarithmic whereas it is roughly proportional to speed at low energies
Bring muons into a kinetic energy range where the dT/ds increases with kinetic energy (T)
Same as freefall and reaching terminal velocity
Gravity opposing friction
s(Mm) dominates over e-strippingin all gases except He
s small above electron binding energy, but not known. Keep T as high as possible
Full MARS target simulation, optimized for low energy muon yield: 2 GeV protons on Cu with proton beam transverse to solenoids (capture low energy pion cloud).
p’s in red
m’s in green
View into beam
Simulate the effect of muonium formation in the tracking, an effective charge as given by sI/(sF+sI) was used
Although earlier studies showed promising results for m- this scheme has not been fully investigated for this flavor.
using calculations of Cohen (Phys. Rev. A. Vol 62 022512-1)
RMS 1ms to 3ns
RMS 1.2MeV/c to 5MeV/c
R.Galea, A.Caldwell, L.Newburgh, Nucl.Instrum.Meth.A524, 27-38 (2004)
RAdiological Research Accelerator Facility
Experiment showed that MC could reproduce data under various conditions. Simulations of Frictional Cooling is promising.
Exp. Confirmation still desired.
Low acceptance but thicker windows was the culprit
Cryostat housing 5T solenoid.
Frictional Cooling is an exciting potential alternative for the phase space reduction of muon beams intended for a Muon Collider