Experimental load map of two stage 1.5 W at 4.2 K (SRDK-415D) GM cryocooler

Thermal and electrical design of superconducting demonstrator for magnetic density separation

“…To calculate the temperature at which the heat loads on the first and second stages of the cryocooler balance the cooling power, the cooling power as a function of temperature is required as an input. Measured data presented in [25] are used, as they are more detailed than the official load-map [26]. The low-temperature measurement points are shown in figure 6.…”

“…The low-temperature measurement points are shown in figure 6. This paper also includes data on the second stage cooling power up to 16 K [25].…”

Superconducting magnets for magnetic density separation : a NbTi based demonstrator

“…To calculate the temperature at which the heat loads on the first and second stages of the cryocooler balance the cooling power, the cooling power as a function of temperature is required as an input. Measured data presented in [90] are used. The low-temperature measurement points are shown in Figure 5.7.…”

“…The low-temperature measurement points are shown in Figure 5.7. The paper also includes data on the second stage cooling power up to 16 K [90].…”

“…Figure 5.7: Cooling power of RDK-415D cryocooler as a function of temperature and load at neighbouring stage. Data are taken from[90]. Also indicated are the expected operating points of the MDS demonstrator magnet system as calculated using the lumped thermal model.…”