High Field Solenoid Magnet with Liquid Nitrogen Cooling

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Abstract
The high field solenoid described in this paper operates at liquid nitrogen temperature (78°K), and uses a relatively small dc power source (100 kw). It has operated continuously and steadily at 36 kgauss and 62 kw under steady state conditions. This is done by forcing the liquid nitrogen coolant through the annuli between the electrical conductors with a circulation pump. The first magnet designed has a 4.6‐cm diam core and the length is such that the central portion of the solenoid gives an experimental ``working space'' 10 cm in length where the field is quite uniform. The cost is modest compared to comparable water‐cooled solenoids both as to initial investment and operation.