Thermal Characterization of an All Hollow Copper Insertable Head Gradient Coil
Trevor Paul Wade 1,2 , Andrew Alejski 1 , Janos Bartha 1 , Dina Tsarapkina 2 , Brian K. Rutt 3 , and Charles A. McKenzie 2
Robarts Research Institute, Western
University, London, Ontario, Canada,
Biophysics, Western University, London, Ontario, Canada,
Stanford University, Stanford, CA, United States
An insertable head gradient coil, with a target strength
of 120 mT/m, was designed and built using hollow copper
tubing for all axes to maximize its thermal capability.
To establish a safe threshold with respect to
temperature, internal and surface temperatures were
monitored using thermocouples and a thermal camera while
the coil was powered with up to 150amps DC and
simultaneously cooled with 15C water at 8.6 L/min. The
maximum observed surface temperature rise was 10C, the
response roughly similar for each axis. Assuming a safe
limit of 30C rise, the coil should be able to operate
at 49mT/m RMS.
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