Matthew A. McCready1, William B. Handler1, and Blaine A. Chronik1
1Physics and Astronomy, Western University, London, ON, Canada
1Physics and Astronomy, Western University, London, ON, Canada
The
dreMR method requires high strength magnetic field shifts which can induce
currents within the main magnet. We have found that dreMR pulses do not
significantly heat our small superconducting magnet. The dreMR method will not
cause a quench of such magnets.
Figure
1. The dreMR insert coil (white) placed within our 0.5T cryogen-free
superconducting magnet, so that their isocenters coincide. A gradient coil
(green) is present but was not used during this experiment.
Figure
2. (TOP) Temperature profiles for multiple coils within the superconducting
magnet. (BOTTOM) Temperature profile for our shield thermocouple within the dreMR
insert. Each pulse corresponds to a set of parameters in Table 1. Noise in
superconducting temperatures increases during dreMR pulse sequences. A black
vertical line denotes where a prolonged break was taken before returning to the
experiment. No pulses were applied during the time that was removed.
