Speaker
Dr
Shaoliang Wang
(Huazhong University of Science & Technology)
Description
Traditional cryostat for scientific experiment in the pulsed high magnetic field uses liquid helium as the cooling source. To reduce the running cost and to increase the operational efficiency, a cryogen-free cryostat based on a GM cryocooler has been developed for a 60 T pulsed field measurement cell at Wuhan National High Magnetic Field Center. The lowest temperature of the cryostat is 1.4 K. A double layer temperature-control insert was designed to obtain a stable temperature in the sample chamber of the cryostat. In order to eliminate the sample temperature fluctuation caused by the eddy current heating during the pulse, the inner layer of the insert is made from fiberglass tubing with epoxy coating. Different from the traditional cryostat, the sample and the temperature controller are not immerged in the 4He bath. Instead, they are separated by helium gas with negative pressure, which makes the heat transfer smoother. At the sample position, a resistance heater wound with antiparallel wires is mounted on the inner layer of the insert to heat the sample. Using the temperature-control insert, the temperature can be controlled with the accuracy of ±0.01K in the range of 1.4 K-5 K, and ±0.05K from 5 K to 300 K.
Authors
Prof.
Liang Li
(Huazhong University of Science & Technology)
Dr
Shaoliang Wang
(Huazhong University of Science & Technology)
Co-authors
Dr
Huakun Zuo
(Huazhong University of Science & Technology)
Dr
Mengyu Liu
(Huazhong University of Science & Technology)
Prof.
Tao Peng
(Huazhong University of Science & Technology)
