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Neutrino Factory/Muon Collider Document 79-v1

DFOFO Cooling Channels for a Neutrino Factory

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Document type:
MuCool Note
Submitted by:
John Urish
Updated by:
John Urish
Document Created:
18 Jan 2000, 12:00
Contents Revised:
18 Jan 2000, 12:00
Metadata Revised:
18 Jan 2000, 12:00
Actually Revised:
14 Sep 2006, 13:35
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Doubled-FOFO (DFOFO) cooling channels with engineering constraints
are proposed for a neutrino factory cooling.
The cooling channels are consisted of 3.2T DFOFO channel with 1.5m cell
length and 4.7T DFOFO channel with 1.6m cell length which provides
sufficiently strong focusing.
Transverse and longitudinal emittances that are
needed for the Neutrino Factory
can be achieved by the using of these cooling channels.
In the FOFO channels, particle losses in transverse direction
were mainly generated in the midpoint
of rf cavities in which beta-function was maximum.
In order to reduce these particle losses, the FOFO lattices are
reconfigurated so that period of FOFO magnetic fields are doubled.
The beta-function in the DFOFO channel is designed to have minimum
value in the midpoint of rf cavities.
In the DFOFO channels, x-dimensional rms emittance 14000 mm mrad
cools to rms 1400 mm mrad, that is, transverse cooling
by a factor of 0.1 in the x phase space.
Longitudinal emittance in the cooling channels
increases from 15mm to 30mm.
The DFOFO channels provide 6D cooing by a factor of 0.02 and
show 27\% particle losses at the 240m channel.

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Eun-San Kim
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