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Neutrino Factory/Muon Collider Document 193-v1

Simulation of a Helical Channel Using GEANT4

Document #:
Document type:
MuCool Note
Submitted by:
John Urish
Updated by:
John Urish
Document Created:
20 Feb 2001, 12:00
Contents Revised:
20 Feb 2001, 12:00
Metadata Revised:
20 Feb 2001, 12:00
Actually Revised:
14 Sep 2006, 13:35
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We present a simulation of a 72 m long cooling channel proposed by
V. Balbekov based on the helical cooling concept developed by Y. Derbenev.
LiH wedge absorbers provide the energy loss mechanism and 201 MHz cavities
are used for re-acceleration. They are placed inside a main solenoidal
field to focus the beam. A helical field with an amplitude of 0.3 T and a
period of 1.8 m provides momentum dispersion for emittance exchange.
The simulation is performed using GEANT4. The total
fractional transmission is 0.85,
and the transverse, longitudinal, and 3-D cooling factors 3.75, 2.27,
and 14.61, respectively.
Some version of this helical channel could eventually be used to replace the
first section of the double flip channel to keep the longitudinal emittance
under control and increase transmission.
Although this is an interesting option, the technical challenges are still

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Posted by Elvira

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Notes and Changes:
V.D.Elvira, P.Lebrun, P.Spentzouris
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