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Neutrino Factory/Muon Collider Document 125-v1

The Single Field Flip Cooling Channel for a Neutrino Factory

Document #:
Document type:
MuCool Note
Submitted by:
John Urish
Updated by:
John Urish
Document Created:
05 May 2000, 12:00
Contents Revised:
05 May 2000, 12:00
Metadata Revised:
05 May 2000, 12:00
Actually Revised:
14 Sep 2006, 13:35
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A cooling channel consisting of two solenoids 50 m in length with
opposite magnetic fields, +/- 5 T, is considered theoretically and
simulated in DPGeant. In the theoretical analysis a comparison with an
ideal Alternating Solenoid channel is presented as well.
A special matching section between the two solenoids provides a very quick change in
magnetic field polarity, which minimizes beam expansion at the flip.
We show that such a scheme cools in the presence of
X-Py and Y-Px correlations, and can remove these correlations by the end of the channel.
Slow acceleration of the bunch is used
to prevent significant particle loss due to the increase in beam
energy spread through the cooling channel.
The intent of the simulation described
here is to demonstrate the technical feasibility of the Single Flip cooling
channel, therefore we present the most conservative possible
design and results.
The DPGeant simulation demonstrates that the Single Flip channel with modest
magnetic fields at the coils cools the beam by a factor of 4, to a final transverse
emittance of approximately 3 mm. Using a 16 GeV proton beam, carbon target, and pre-cooling section
described in [2], the net transmission through the Single Flip Channel is ~ 0.08
muons per incident proton.
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Posted by Monroe
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Notes and Changes:
V. Balbekov, P. Lebrun, J. Monroe, P. Spentzouris
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