Integrating the MANX 6-D Muon Cooling Experiment with the MICE Spectrometers Page: 1 of 3
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INTEGRATING THE MANX 6-D MUON COOLING EXPERIMENT WITH
THE MICE SPECTROMETERS*
S.A. Kahn#, R.J. Abrams, C. Ankenbrandt, M.A.C. Cummings, R.P. Johnson, T. Roberts, Muons
Inc., Batavia, IL, U.S.A.
K. Yonehara, Fermilab, Batavia, IL, U.S.A.
The MANX experiment is to demonstrate the reduction
of 6D muon phase space emittance using a continuous
liquid absorber to provide ionization cooling in a helical
solenoid magnetic channel. The experiment involves the
construction of a short two-period long helical cooling
channel (HCC) to reduce the muon invariant emittance by
a factor of two. The HCC would replace the current
cooling section of the MICE experiment now being setup
at the Rutherford Appleton Laboratory. The MANX
experiment would use the existing MICE spectrometers
and muon beam line. This paper shall consider the
various approaches to integrate MANX into the RAL hall
using the MICE spectrometers. This study shall discuss
the matching schemes used to minimize losses and
prevent emittance growth between the MICE
spectrometers and the MANX HCC. Also the placement
of additional detection planes in the matching region and
the HCC to improve the resolution will be examined.
The MANX experiment is being proposed to test the
theory of using a Helical Cooling Channel (HCC) to
reduce the 6D phase space of a muon beam. The HCC
cooling scheme uses a continuous absorber to provide
ionization cooling in a helical solenoid channel . The
HCC will have an application in providing the six orders
of magnitude in 6D muon phase space reduction that will
be necessary for a muon collider. The HCC combines a
solenoid field with helical dipole and helical quadrupole
fields to provide a large acceptance channel. The most
efficient approach to create the magnetic lattice for the
HCC is to construct it from short solenoid coils arranged
along the helical path as shown in figure 1. This has been
shown to produce the desired field without an undesirably
large magnetic field at the superconducting coils [2, 3].
The HCC proposed for a muon collider would use 400
atm. (room temperature equivalent) pressurized H2 gas as
the absorber. A muon traversing the channel would lose
energy with dE/dx=14.3 MeV/m along the path. RF
cavities would be inserted into the channel to replace the
energy lost in the absorber. The RF requirements are
substantial and would not allow much free space in the
lattice without RF cavities. In the MANX demonstration
experiment liquid helium is chosen as the absorber and
there will be no RF cavities to replace the lost energy.
These choices are made to both control costs and reduce
the timeline to mount the experiment. *
Work supported by U.S. DOE contract DE-AC02-07CH11359
The experiment has been proposed to be performed at
the Rutherford-Appleton laboratory in the MICE hall at
ISIS. The experiment would make use of the MICE muon
beam with the magnets configured for a muon momentum
of 350 MeV/c in the upstream MICE spectrometer. The
muon beam line is shown in figure la. The upstream part
of this beam line consists of two bending dipoles with a
focusing solenoid magnet for a decay channel in between.
Table 1 summarizes the beam parameters after the second
bend and after the beam diffuser just before entering the
upstream spectrometer. The pion contamination in the
muon beam after the second bend is estimated to be
0.65%. MANX will use the upstream and downstream
tracking spectrometers from MICE. The existing
Cherenkov detector should be able to tag the residual
pions in threshold mode. The downstream EM calor-
imeter or similar device will be used to tag decay
electrons and give a muon momentum measurement to a
certain precision. The MICE H2 absorbers and RF
cavities will not be used. They will be replaced with a
short HCC channel and matching sections.
Figure 1: MANX baseline matching design. (a) MANX
layout including beam line. (b) Enlarged MANX HCC
with baseline matching sections.
Table 1: Parameters describing the MICE beam adjusted
for 350 MeV/c muons.
Parameter After 2n Bend After Diffuser
P, MeV/c 375 341
Op MeV/c 44 36
6x, mm 102 55
6y, mm 56 41
opX, mm 11 32
Opy, mm 7 30
GT, ns 0.29 0.47
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Kahn, S.A.; Abrams, R.J.; Ankenbrandt, C.; Cummings, M.A.C.; Johnson, R.P.; Roberts, T. et al. Integrating the MANX 6-D Muon Cooling Experiment with the MICE Spectrometers, article, May 1, 2009; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc926486/m1/1/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.