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Superconducting Magnets for a Muon Collider
Michael A. Green
Ernest Orlando Lawrence Berkeley National Laboratory
University of California
Berkeley CA. 94720
The existence of a muon collider will be dependent on the use of superconducting magnets. Superconducting
magnets for the p p+ collider will be found in the following locations: the a -n + capture system, the muon
phase rotation system, the muon cooling system, the recirculating acceleration system, the collider ring, and the
collider detector system. This report describes superconducting magnets for each of these sections except the
detector. In addition to superconducting magnets, superconducting RF cavities will be found in the recirculating
accelerator sections and the collider ring. The use of superconducting magnets is dictated by the need for high
magnetic fields in order to reduce the length of various machine components. The performance of all of the
superconducting magnets will be affected the energy deposited from muon decay products.1. INTRODUCTION
The proposed muon collider[1-5] consists of the
following components: 1) a 10 GeV proton source
that generates about 1.5 x 1015 protons per second,
2) a target section that produces and captures pions,
3) a section where the pions decay to muons that ant
phase rotated to compact bunch, 4) a muon cooling
section where the muon emitance is reduced three
orders of magnitude, 5) several rings to accelerate
muons to 2 TeV, 6) the collider ring, and 7) the
detector. Superconducting magnets will be found in
all of these sections except for the proton source.
This report describes the superconducting
solenoids in the pion capture system around the
target. A brief description of the solenoids needed in
the phase rotation and the muon cooling sections is
presented. Dipole and quadrupoles for the
recirculating accelerator rings and the collider ring ant
also described. This report does not include any
discussion about superconducting magnets that ant
part of the detector system around the collider
collision point.
A muon decays to two neutrinos and electron or
positron (depending on the charge state of theoriginal muon). Roughly forty percent of the muon
energy ends up in the decay electron or positron.
The energy in the electron or positron can be
deposited in various parts of the muon collider and
its subsystems. The problem of muon decay is at
its worst in the collider ring, but it is a problem for
superconducting magnets and RF cavities throughout
the muon collider subsystems.
Muons have a life time that is dictated by its
energy. The mean life of a muon at rest is about
2.197 ps. At the collider full energy the of 2 TeV,
the muons will have a mean life of 41.6 ms. This
means that the repetition rate for the muon collider
must be of the order of the muon life time in the
collider ring if high colliding ring luminocities ant
to be maintained. In order to maintain a luminocity
of 1035 cm2 s-1 in a collider ring with a J* of 3 mm
at the collision point, over 1.2 x 1014 muons per
second must be created and stored in a ring with 7 T
bending magnets. The collider ring must have two
bunches (one of each charge state) of 2x1012 muons
per bunch at a repetition rate of 30 Hz in order to
have the desired luminocity at the collision point.* This work was performed with the support of the Office of High Energy and Nuclear Physics, United States
Department of Energy under contract number DE-AC03-76SF00098._1_
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Green, Michael A. Superconducting Magnets for a Muon Collider, article, February 15, 1996; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc900649/m1/1/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.