A meeting of the NHMFL Users' Committee was held on Sunday, December 12 and Monday, December 13, 1993 at the NHMFL Florida State University site. Those in attendance were the elected members of the committee (save for one), Dr. Bruce Brandt, Director of Instrumentation and Operations, Dr. Larry Campbell, Director of the Pulsed Magnet Facility, and at times, several members of the NHMFL User Services corps.
The committee members are :
David Awschalom, UCSB
Greg Boebinger, AT&T
James Brooks, BU (absent)
Eric Jones, Sandia
Martin Maley, LANL
Bruce McCombe, Buffalo
Michael Naughton, Buffalo
Horst Stormer, AT&T
Stan Tozer, NHMFL
The Committee members were provided with overview material relating to the Operations and instrumentation facilities, lists of users of the 20-T superconducting magnets, past and near future, details of magnets on hand and planned, and drawings of the 45-T hybrid installation. Following is a summary report and minutes of this meeting.
There was general consensus concerning the following points which, the Users' Committee wishes to stress, are the most consequential to the future success of the NHMFL as a user facility:
(1) Election of Officers
After discussing organization and tenure options for the Users' Committee, it was agreed that :
Certain one-time exceptions to the above adoptions are required for the inaugural Committee. Elections for the first set of officers were undertaken at this December 1993 meeting. Eric Jones was elected Chair, Horst Stormer, Chair-elect, and Michael Naughton, Recording Secretary. It was agreed that the best way to arrange the timing of future elections, etc., would be to have these three officers serve until just before the May, 1995 Users' Committee Meeting. This decision precluded the three one-year term members of the present Committee from being eligible for officers roles.
(2) Statement of Purpose
A short document defining the purpose and goals of the Users' Committee was drafted:
Users' Committee National High Magnetic Field Laboratory
The Users' Committee for the National High Magnetic Field Laboratory is an elected council whose purpose is twofold: to represent the interests of the high magnetic field user community as a whole, and to advise the Directorate of the NHMFL on matters and policies affecting the operation of the Laboratory. These general functions will be performed through the following specific actions:
There is now scheduled a meeting open to all past, present, and future users of high magnetic fields. It will coincide with the annual APS March Meeting. The first such meeting will be held on Sunday, March 20, 1994 in Pittsburgh. The format was not finalized at this Users Committee meeting, but a few scenarios were discussed: have a small number of short talks (~4) given by invited users in the field, have J. Crow and/or B. Brandt, and L. Campbell provide overviews of the state of the Laboratory, or have NHMFL post-docs present a experimental facilities reports. An announcement relating to this meeting should appear in the February, 1994 APS News.
(4) NHMFL @ LANL
A report on activities at the pulsed field facility at Los Alamos was
presented by Associate Director Larry Campbell. More than a dozen
institutions have utilized the LANL facilities so far. A timeline for
various equipment acquisitions was given, such as dilution refrigerators
for the 20T superconductor (1/94) and the pulsed magnets (4/94). Pulsed
field facility upgrade options for NSF renewal were discussed, with advice
and opinions given by Committee members on the most prudent path(s). In
order of importance for future emphasis, the Committee recommended the
(1) a 100-T generator-capacitor hybrid,
(2) a 65-T quasi-continuous field upgrade (motor generator), and, tentatively,
(3) a 75-T quasi- continuous magnet of a new design.
Cost estimates for the three projects were given.
The possibility of hosting a "100 Tesla Workshop" around the March Meeting was proposed, with input solicited by Larry. Tentative dates were discussed. Initial dates were just after the March Meeting, which received little enthusiasm. Alternate dates suggested were the weekend before the March Meeting, which may conflict with the tutorials. Another possibility is to postpone the workshop until May, 1994, close to the May Users' Committee meeting.
(5) Laboratory Space / Cells at NHMFL@FSU
The experimental floor space design around the magnets remains unsatisfactory. During the construction phase, the users had already requested a stable second floor at the height of the top of the magnets as an alternate experimental platform. This second floor was expected to connect between all cells, (except hybrid cells) for easy access for instrumentation, helium dewars, etc. via a centralized elevator. We have been informed that these plans were abandoned due to lack of funds. The Users' Committee continues to regard an upper platform as essential for many experiments. It proposes now the construction of a U-shaped elevated platform in each cell, with a shared elevator which can be moved to each of the cells when required. One or several overhead cranes which can access all cells is very desirable. Certain details should be coordinated with the local construction managers on site, to avoid conflicts or redundancy.
(6) Scheduling of Magnet Time
The issue of scheduling the DC magnets at FSU will prove to be critical to
users of the Laboratory. It was suggested by Bruce Brandt that the proposed
hours of operation would be something like 7 am to 10:30 pm, or 15 hours
per day. The Committee posed several questions to Bruce. Will it be
possible to run overnight, even only occasionally as determined by the
urgency and importance of the experiment? While recognizing the potential
difficulties with this mode of operation, we beseech the Laboratory to keep
this option open and viable. We must keep the Laboratory flexible, and find
the best way to do so. In this regard, the Committee would like to know if
(and how well) an automatic control system would work.
The Committee did not directly address the scheduling of the 20T superconductor staging magnet or the pulsed magnets at LANL. It is expected that this can be dealt with, if required, at future meetings.
The issue of housing for short and intermediate term users was discussed. This has historically been a nagging problem at the Francis Bitter lab, partly because of proximity and partly cost. There appears to be a finite possibility of a "lab habitat" on the grounds of the facility, although we won't count on this for at least a few years. Presently, B.B. tells us that the Lab has an arrangement with a local motel. As I recall, this still requires the use of a car. Perhaps a room or two within the laboratory could be designated as quiet chambers, with a cot and linen service, for cat naps during (typical) experimental runs.
It was suggested that the space for the Lab library looks rather small, and not secluded enough. Will the users, through their Committee, have any say as to what journals will be purchased? There should also be terminals, etc. included.
(9) Split-Coil Magnet
A growing number of users are requesting high angular resolution in high magnetic fields. The most accurate method is in a horizontal Helmholtz magnet. This does not appear to rank very highly in the future plans of the Laboratory, to the dismay of several Committee members. It was proffered that, in addition to the in situ rotation capabilities being pursued for traditional vertical-field solenoids, a sufficiently large field split coil be developed (e.g., 20T). We suggest that further discussion of this issue be undertaken to assess the utility of such a facility.
(10) NHMFL Newsletter
We suggest that the NHMFL Newsletter be published biannually, and include such items as an interview with a user, truncated minutes of the Users' Committee meetings, who has been running experiments and who is upcoming, a photograph of the Users' Committee so that other users and potential users might recognize them at scientific gatherings and approach them about the Lab.
(11) Other Items Discussed, Observations Made, and Questions Raised