The Users' Committee of the NHMFL met in Tallahassee on May 29 and 30,
NHMFL Users' Committee
29-30 May 1996
Members in attendance were: J. Brooks, P. Chaikin, W.G. Clark, N. Dalal, R.
Goodrich, M.J. Naughton, S. Tozer, C. Perry and R. Vold.
Members absent were: D. Awshalom, H. Stormer and E. Zuiderweg.
Many items and situations were discussed at the meeting, not all of which
will find lengthy reference in this report. Topics considered by the
Committee to be of greatest importance to the user community are elaborated
Condensed matter physics NMR in resistive magnets
Through the efforts of W. Moulton, P. Kuhns, and A. Kleinhammes, this
activity has had a significant impact on several areas of research. It
has advanced the technology of very high field NMR for those
applications where high resolution is not needed and it has the
potential to go much further in this respect. In comparison to the
resources it has received, it has attracted a large level of
participation from the user community. This group's activity warrants
a regular budget that includes support for developing additional high
field NMR instrumentation (spectrometers, probes) for use up to the
highest fields available now and in the future. The addition of a
superconducting staging magnet to complement the higher field resistive
and hybrid magnets is reasonable. A high priority should be placed on
obtaining the dedicated, pulsed NMR instrumentation needed for its
projects. The NHMFL activity in this area is unique and it has the
promise to remain so for the foreseeable future. Since this group has
evolved and operated successfully as a part of User Services, the NHMFL
Administration should consider attaching it administratively as a
recognized part of User Services.
The CIMAR Group is recognized for its effort to secure funding from
Federal agencies. It is encouraged to focus its long term activities
on unique, state-of-the-art facilities that will make it singularly
attractive for external users, such as a 1.1 GHz high resolution NMR
system. It is also encouraged to attract a greater overall
participation by external users of the NMR facilities. Within the NMR
facility, more special probes should be made available or help with
their construction should be given. Better probes for 2H, 13C, 15N,
and 31P should be available for users. The EMR facility should
increase the fraction of its operating time that is available to
outside users. The Committee is distressed that the completion date
for the 900 MHz system has been pushed further back. There is a risk
that by that time this system would no longer be unique. It is
therefore recommended this project be accelerated or abandoned, in
favor of a 1.1 Ghz or higher system.
The Committee is concerned that the budget for staff and equipment to
support the users is very small. We ask that the lab examine the
budget allocations for these two categories and its commitment to the
magnet development/manufacturing area, which has, out of necessity,
been substantial over the last five years. While aware of the
requirements for specific magnets which we would like to see built over
the next five years, support staff and equipment are nonetheless
essential if NHMFL is to be a truly outstanding user facility. To this
end, the in-house research and the research of the external users
should dictate which magnets are built and how the permanent equipment
funds for users are spent.
Recommendations for Magnets
The number one priority for the laboratory should be the completion of
the 45 T hybrid project. Second should be the 100 T pulsed field
facility at LANL. The User Committee strongly recommends that the
management of the 100 T project be carried out by a committee composed
of an equal number of members of both the Tallahassee and LANL magnet
development programs, but that the design and construction of the
system be handled exclusively by either Tallahassee or LANL. In this
manner, the difficulties, delays, and unnecessary cost increases
experienced by the hybrid project, due to separate management and
construction of the outsert and insert, will not be repeated here. A
magnet at Tallahassee that incorporates a large field gradient, high
modulation field amplitudes and homogeneity improvement coils should be
the next construction priority following the 45 T hybrid and the 100 T
systems. This "specialty" magnet will find numerous users and
applications unique to this laboratory. As an ongoing project the
magnet development group should consider a horizontal split coil
resistive magnet at Tallahassee and 70 to 80 T pulsed coils at LANL.
As usage of the 50 and 60T magnets at Los Alamos will inevitably
increase, an aggressive pursuit of higher fields in capacitor driven
magnets should be pursued. The near term technology will certainly
allow for 70 to 80T in such magnets, allowing for the inevitable
tradeoff between bore size and maximum field. It is the
responsibility, indeed, the mission of the laboratory to push such
limits. We appreciate the need for ongoing materials research and
development in this drive for the highest fields. The laboratory is
thus encouraged to take the lead in such endeavors.
- It appears that user support at the Los Alamos facility is
increasing to an acceptable level in the near future. This will
make a marked difference in the user-friendliness of pulsed field
experiments, and significantly increase the scientific output.
- A plan for extending operating hours at Tallahassee should be
developed and implemented during the next year.
- The PECO list for equipment should be scrutinized for
appropriateness and feasibility.
- A solid plan to make the NHMFL High B/T facility into a bona
fide user facility needs to be quickly defined and put in place.
- Are real safety issues being dealt with adequately ?
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