276 Ë 8 New progress of HTS Maglev vehicle
Fig. 8.17:Ring-shaped YBCO bulk sample fixed on the second-stage cooling head of the cryocooler.
bulk was 30 mm in outside diameter, 18 mm in inside diameter, and 15 mm in thick-
ness. It was fixed on the second-stage cooling head of the cryocooler (Fig. 8.17).
Figure 8.18 shows the photograph of the deep cryogenic measurement system
assembled in the HTS Maglev measurement system, SCML-01 [26] (see Section 5.3),
a model K535 Stirling cryocooler, a model 331 temperature controller, and some
low temperature sensors. The experiment temperature was controlled by the deep
cryogenic measurement system, ranging from 77 to 60 K. For the force measurements,
the YBCO bulk was cooled in different FCHs above the Halbach PMG. The quasi-static
Fig. 8.18:Deep cryogenic measurement system.