Analysis of the factors affecting the realization of lambda transition temperature of 4He

• Autorzy: Yin L. , Lin P. , Zhao J. J. , Qi X.
• Języki publikacji: EN

Abstrakty

EN

Owing to the dramatic change in the thermal conductivity of 4He when its temperature crosses the transition of superfluid (HeI) and normalfluid (HeII), a sealed-cell with a capillary is used to realize the lambda transition temperature, Tλ. A small heat flow is controlled through the capillary of the sealed-cell so as to realize the coexistence of HeI and HeII and maintain the stay of HeI/HeII interface in the capillary. A stable and flat lambda transition temperature "plateau" is obtained. Because there is a depression effect of Tλ caused by the heat flow through the capillary, a series of heat flows and several temperature plateaus are made and an extrapolation is applied to determine Tλ with zero heat flow. A rhodium-iron resistance thermometer with series number A34 (RIRT A34) has been used in 24 Tλ -realization experiments to derive Tλ with a standard deviation of 0.022mK, which proves the stability and reproducibility of Tλ.

Słowa kluczowe

EN

4He; lambda transition temperature; sealed-cell; realization

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2011
• Tom: Vol. 18, nr 1
• Strony: 13--23
• Opis fizyczny: Bibliogr. 13 poz., rys., tab., wykr.

Twórcy

autor

Yin L.

autor

Lin P.

autor

Zhao J. J.

autor

Qi X.

• School of Science, Beijing University of Chemical Technology, Beijing 100029, China,

Bibliografia

• [1] Thomas, H.P. (1990). The International Temperature Scale of 1990, (ITS-90). Metrologia, 27, 3-10.
• [2] Hwang, K.F., Khorana, B.M. (1976). Lambda transition of liquid helium as a thermometric fixed point. Metrologia, 12, 61-63.
• [3] Duncan, R.V., Ahlers, G. (1992). A sealed 4He superfluid-transition fixed-point device. In Temperature, its Measurement and Control in Science and Industry. American Institute of Physics. New York, 243-245.
• [4] Lin, P., Mao, Y.Z., Hong, C.S., Yue, Y., Zhang, Q.G. (1990). Study of the realization of 4He lambda transition point temperature by means of a small sealed cell. Cryogenics, 30, 432-436.
• [5] Lin, P., Mao, Y.Z. , Yu, L.H., Zhang, Q.G., Hong, C.S. (2002). Studies on a sealed-cell lambda-point device for use in low temperature thermometry. Cryogenics, 42, 443-450.
• [6] Peroni, I., Pavese, F., Ferri, D., Lin, P., Zhang, Q.G., Yu, L. H. (2002). A sealed cell for the accurate realization of the λ-point of 4He, In: Proceedings of TEMPMEKO 2001, 8th International Symposium on Temperature and Thermal Measurements in Industry and Science. VDE Verlag GMBH. Berlin, 391-396.
• [7] Lin, P., Mao, Y.Z., Hong, C.S., Pavese, F., Peroni, I., Head, D., Rusby, R. (2003). Realization of the lambda transition temperature of 4He using sealed cells. In: Temperature, its Measurement and Control in Science and Industry. American Institute of Physics. New York, 191-195.
• [8] Duncan, R.V., Ahlers, G., Steinberg, V. (1988). Depression of the superfluid transition temperature in 4He by a heat current. Physical Review Letters, 60, 1522-1525.
• [9] Kerrisk, J., Keller, W. (1969). Thermal Conductivity of Fluid 3He and 4He at Temperatures between 1.5 and 4.0° K and for Pressures up to 34 atm. Physical Review, 177, 341-351.
• [10] Ahlers, G. (1968). Thermal conductivity of HeI near the superfluid transition. Physical Review Letters, 21, 1159-1162.
• [11] Pollack, G.L. (1969). Kapitza Resistance. Rev. Mod. Phys., 41, 48-81.
• [12] Kierstead, H.A. (1967). Lambda Transformation of Liquid 4He at High Pressures. Physical Review, 153, 258-262.
• [13] Ahlers, G. (1968). Effect of the gravitational field on the superfluid transition in 4He. Physical Review, 171, 275-282.