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. Author manuscript; available in PMC: 2019 Mar 11.
Published in final edited form as: J Magn Reson. 2017 Sep 1;283:71–78. doi: 10.1016/j.jmr.2017.08.014

Figure 6. Liquid nitrogen consumption of the heat exchanger.

Figure 6

Plot of the volume of liquid nitrogen bath in the heat exchanger dewar over three days. Positive slopes correspond to fill periods, while negative slopes correspond to heat exchanger boil-off periods. Individual boil-off periods were linearly fit and averaged over the 10 cycles shown above to find an average boil-off rate of 3.8 L/h or 91 L/day. Sample temperatures were maintained below 85 K while the MAS rotor frequency held constant at 5.2 kHz.