Cryostat stability regions. NMR-200 @ IJS. Spring 2020.

All measurements were performed with constant power (PID controller disabled).

• Stable means less than ±0.1 K in ~30min.
• Full flow means the knob on the flow meter was fully opened (~3.5L/h).
• Marginal stability means that stable conditions were not met in ~30min, but the oscillations were slowly dying out or were constant. 
• Unstable means that oscillations were big (a few K) or getting bigger. Average temperature was estimated and plotted, but it has a large error.