A Cost Effective Design for a Neutrino Factory Page: 4 of 23
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Proton Driver
Target
Phase Rotate #1
Mini Cooling
Drift
Phase Rotate #2
Cooling
Linacs
Recirc. Linac #1
Recirc. Linac #2
Storage RingNeutrino Beam
Figure 1: Main components of the neutrino factory
We define the normalized transverse emittance by e, = 073/,3, where 3 and
-y are the relativistic factor for the stored muons, while o- and 03, are RMS beam
radius and 1-function at the same place along the machine, respectively. Similarly,
we define the normalized transverse acceptance by A, = 1-ya /33, where a, is the
vacuum chamber radius. We assume essentially round beams with similar emittance
in the horizontal and vertical direction, and use the subscript x for any one of them.
In parallel we use the unnormalized emittance e, and acceptance A, that are a factor
,3-y smaller than the normalized quantities. We typically assume that the ratio between
vacuum chamber and RMS beam radius is sigN ~ 3.
3.1 Muon Storage Ring
Muons are injected into the pSR with a full-aperture kicker system. The injected muon
pulse must be shorter in time than a revolution period. There is no accumulation or
stacking of muons in any direction of phase space. Accumulation would only be useful
if the emittance and/or momentum band of the incoming muon beam were smaller than
the acceptance of the decay ring. This may happen either because there is a bottleneck
somewhere upstream that should be removed or the muon production, cooling and
acceleration results in a smaller transverse emittance and momentum band that the4
(42 m rf: 30 to 70 MHz)
(3.5 m Hydrogen)
(160 m)
(56 m Induction Linac)
(80 m)
(0.7 and 2 GeV)
(2-8 GeV)
(8-30 GeV)
(30 GeV 800m circ)
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Palmer, R. B. A Cost Effective Design for a Neutrino Factory, article, November 17, 1999; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc704733/m1/4/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.