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--- wiki:1k_pot [2022/01/25 16:52]
henri.godfrin@neel.cnrs.fr
+++ wiki:1k_pot [2022/01/29 18:30] (current)
henri.godfrin@neel.cnrs.fr
@@ Line 1: / Line 1: @@
-====== The 1K pot ======
+====== Precooling issues: 1K pot, or no 1K pot? ======
+===== The continuous "1K pot" =====
   * Continuously operating 4He evaporation refrigerator. Rev Sci Instrum (1971);42:147–50.  https://doi.org/10.1063/1.1684846
   * Low dead time 1 K cryostat, J.Talpe and V.Bekeris, Cryogenics 29, 854-856 (1989). https://doi.org/10.1016/0011-2275(89)90161-6
   * Design and performance of a 4He-evaporator at <1.0 K, N.K. Das ⇑, J. Pradhan, Md.Z.A. Naser, A. Roy, B.Ch. Mandal, C. Mallik, R.K. Bhandari, Cryogenics 52 (2012) 679–684, https://doi.org/10.1016/j.cryogenics.2012.04.013
+===== The "1K loop" in pulse-tube based dilution refrigerators =====
+  * Dry dilution refrigerator with 4He-1K-loop, K. Uhlig, Cryogenics 66, 2015, 6-12. https://doi.org/10.1016/j.cryogenics.2014.10.004
+===== Condensing the 3He at high pressure  =====
+{{ condensing3he.jpg?400 |Condensing 3He}}
+At 4.2 K the minimum enthalpy (vs. Pressure) is Hm ≈ 42 J/mol near 3 bars, just above the enthalpy of the vapor at 0.7 K (35 J/mol). Steady state is possible using a heat exchanger to precool the incoming 3He:
+  * J. Kraus, Cryogenics 17, 173 (1977) [[https://doi.org/10.1016/0011-2275(77)90279-X]]
+  * A.T.A.M. de Waele, A.B. Reekers, H.M. Gijsman, Cryogenics 17, 175 (1977) [[https://doi.org/10.1016/0011-2275(77)90280-6]]

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