Neutrino factory and muon collider collaboration R and D activities Page: 3 of 5
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tests, is located at the end of the linac and will later give
access to the beam for component tests. It has convenient
access as well for 201.25-MHz RF power.
Absorber tests are now being readied by the Illinois
Consortium for Accelerator Research (ICAR) to occupy
the area. Pressure tests of the windows will be first,
followed eventually by thermal tests of a full system. Very
sophisticated thermal modeling is required for the
absorber design. Both internal and external heat
exchanger concepts are being investigated, the former as a
joint R&D activity funded by U.S.-Japan funds.
3.3 Theory and Simulations
The goal for the beam simulation group is to complete
end-to-end simulations for a complete facility (target,
capture, bunching, cooling, acceleration, storage ring),
including the effects of errors. Developing analytical tools
for understanding front-end performance is another key
activity, as is developing tools and techniques to study full
6D cooling ("emittance exchange"). Such techniques are
required for the design of an eventual muon collider and
would be helpful as well for improving the performance
of a Neutrino Factory. The simulation group also provides
support for the design of a demonstration experiment of
cooling. As described in Ref. 4, considerable progress has
been made at developing an integrated front-end design.
Analytical tools for the transverse cooling have been
developed [11] and work on a more generalized approach
is in progress. Simulations and tracking for the accel-
eration and storage ring have also been undertaken. Due
to the large beam size and energy spread, these efforts
require a very detailed description of the magnetic fields.
3.4 Component Development
An important R&D area is the development of 201.25-
MHz SCRF cavities capable of high gradients and with
adequate mechanical stiffness to avoid microphonics.
Though SCRF is by now a well-developed art, cavities at
the frequency required for muon acceleration have not
been produced. In addition to a technical demonstration of
such devices, cost-effective fabrication methods must be
developed and tested. A test facility for this R&D
program (Fig. 3) is being built at Cornell. It will include
an enlarged clean room and high-pressure water rinsing
facility suitable for the 201.25-MHz cavity work.
Fabrication of the first 201.25-MHz SCRF test cavity, a
Nb-coated-copper design, has begun at CERN. In
addition, tests have begun at INFN-Legnaro to produce a
spun cavity, thus eliminating the welding step. The first
trial will be at 500 MHz; if successful a 201.25-MHz
version will be built. Improving the quality of sputtered
Nb films is being studied at Beijing University using DC~d --
Figure 3: Test facility for 201.25-MHz SCRF
cavities under construction at Cornell.
bias sputtering as opposed to the magnetron technique
used at CERN.
Study of induction linac technology for the phase
rotation section is another MC R&D activity. In Study-I,
the challenge was to provide multiple pulses for the cores
on a microsecond time scale. For Study-II, the time
separation between pulses, 20 ms, is more standard for
this technology. However, the ability to combine multiple
pulse waveforms in a common core, and the identification
of the most cost-effective core material require R&D.
Plans for this are being developed. It is worth noting here
that, though large, induction linac cores of this general
size have already been successfully produced (Fig. 4) for
the DARHT project [12].
4 R&D PLANS
For the targetry program, the next steps will include
measurements of neutron and pion yields as part of the
E951 experiment. Completing the design and then the
fabrication of a pulsed 20-T solenoid is also a priority.
As mentioned, the MUCOOL program will shift
emphasis to the larger 201.25-MHz component
development. Developing Be windows or grid tubes for
the large aperture cavity is an R&D task in its own right.
A new solenoid for testing the RF cavities will be required
and must be designed and fabricated. Finally, developing
plans for a cooling demonstration experiment is part of
the mandate of this program.
There are several component development activities to
be pursued. For the SCRF cavities, the near-term plan is
to fabricate a cavity with adequate mechanical stiffness
and then demonstrate high-power pulsed operation at
design gradients of 15-20 MV/m. Design of a power
source for the RF systems is another important R&D item.
The favored approach is a multibeam klystron, possiblya
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Zisman, Michael S. & Collaborat, Neutrino Factory and Muon Collider. Neutrino factory and muon collider collaboration R and D activities, article, March 22, 2001; California. (https://digital.library.unt.edu/ark:/67531/metadc723644/m1/3/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.