We also thank the NHMFL for its flexible response in developing a floor plan for the new building in close collaboration with the user community. This final floor plan serves the needs of the user programs quite well and logically divides the laboratory into separate areas for user facilities and magnet development/support. We particularly support the plan for independent magnet cells, featuring automatic switching of the capacitor bank. Because it will have such an immediate positive impact on the scientific output of the pulsed field facility, this automatic switching should be a very high priority which, in principle, could be implemented in the present building before the move to the new building. The switch should be modular and thus easily transportable into the new building.
The following actions would improve the effectiveness of this facility
DATA PLOTTING DURING RUNS - External users should have access to a computer (both a PC and MAC) to plot and analyze the data independent of the data collection computer. A variety of commercial plotting software packages, such as Origin, should be installed for use by users. The existing situation makes it difficult for the user to make decisions in real-time as to the quality of existing data and the strategy for future magnet pulses. It also places unnecessary burden on the NHMFL staff who now must actively participate in data plotting and analysis.
MAXIMUM RELIABLE FIELDS - There is concern that the pulsed magnets are not being pushed to their maximum reliable fields. Because the current practices are very conservative and focus on minimizing the chance of a magnet failure during a user's experiment, there is a lack of magnet lifetime data. In order to overcome this problem, we recommend that a series of identical magnets be built and tested for reliability. One scenario is to test one to destruction, and subsequently to test the others for lifetime with a series of pulses: one magnet at 95% rating, another at 90% rating, a third at 85% rating, etc., until each magnet fails at the corresponding de-rated field. This may take hundreds of pulses, but it should provide the basis for a rational decision to replace the current "gut-feeling" decision regarding the tradeoff between de-rating a magnet and the anticipated increase in magnet lifetime.
SMALLER BORE MAGNETS - There is considerable interest in the user community to use smaller bore magnets to obtain higher magnetic fields. Techniques are now being developed to perform a variety of measurements in a 15 mm bore. For some, and perhaps many users, the resulting increase in the achievable magnetic field is worth the effort required to work in a smaller bore. The 100T magnet appears to REQUIRE a smaller (perhaps 15 mm) bore if it is to be built from currently available materials. This potentially negative impact on the flexibility of the magnet is more than offset by the higher achievable field that it will afford.
60-T LONG-PULSE MAGNET - We await with great anticipation the successful completion of the 60-T long-pulse magnet this summer. This magnet will put Los Alamos on the map in many users' minds, because it will have a very important set of capabilities which are unique in all the world.