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By R. F. Blanks, K. D. Timmerhaus (auth.), K. D. Timmerhaus (eds.)

The 1959 Cryogenic Engineering convention Committee is happy to pre­ despatched the papers of the 1959 Cryogenic Engineering convention. we're lucky to have had the collage of California at Berkeley, Ca!., as our host for the 5th nationwide assembly of this type. The circulation to the West Coast for this prior Cryogenic Engineering convention was once caused partially by way of the big focus of missile actions that are to be came upon there. attractiveness of cryogenic operations and methods within the mis­ sile box is given in lots of of the incorporated papers. The collage of California used to be definitely wen suited to the sort of assembly as this since it was once right here that a lot early paintings was once performed in cryogenics. This pioneering in cryogenics remains to be obtrusive this day within the operation of the 72-in. bub­ ble chamber on the Lawrence Radiation Laboratory. The Cryogenic Engineering convention salutes the missile and the cryogenic pioneers of the day gone by and this present day on the collage of California. unique thank you needs to visit Dr. D. N. Lyon from the Low-Temperature Laboratory of the college of California, who as chairman of the 1959 Cryogenic Engineering convention Committee has labored tirelessly to extend the stature of this convention. vii ACKNOWLEDGMENT The Cryogenic Engineering convention Committee is deeply thankful for the ongoing aid and curiosity of the subsequent corporations who made the 1959 Cryogenic Engineering convention attainable. Aerojet-General company A. D. Little, Inc.

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Additional resources for Advances in Cryogenic Engineering: Proceedings of the 1959 Cryogenic Engineering Conference University of California, Berkeley, California September 2–4, 1959

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Danials, Proc. Phys. Soc. B63, p. 1028 (1950). A-3 CRYOGENIC EXPERIENCE WITH THE 72-INCH BUBBLE CHAMBER H. P. Hernandez Lawrence Radiation Laboratory University of California Berkeley, California Introduction The 72-in. bubble chamber was successfully operated for the first time in March, 1959 {I]. The bubble chamber is a detector for nuclear particles, and it is presently operating in a beam of antiprotons and n- mesons from the 6-Bev bevatron. -thickoblongglasswindow, 23 in. wide by 75 in. long.

R. F. Post, UCRL-4231 (1954). 6. R. F. Post, Phys. , Vol. 126 (1946). 7. D. K. C. 14. 8. D. K. C. MacDonald, Proc. Roy. Soc. A202, p. 103 (1950). 9. F. Bitter, Rev. Sei. , Vol. 379 (1936); Vol. 318 (1937); and Vol. 373 (1939). 10. D. K. C. MacDonald, Proc. Roy. Soc. 221, p. 534 (1954). 11. A. N. Gennetsen, Handbuch der Physik, Vol. 210. 12. D. K. C. MacDonald and K. Mendelssohn, "The resistivity of Na at low temperatures," Proc. Roy. Soc. 103 (1950). 13. G. W. Horsley, "The purifleation of sodium by vacuum distillation," AERE, Report MIR.

Ouring the first cool-down the temperature gradient was measured on the glass surface with 20 thermocouples, 7 each on the top and bottom and 6 around the edge. Now only 8 thermocouples are used, 2 on the top surface and 6 around the edge. The gradients are controlled by the refrigerator and held at about 12°K on the surface. hr. The 65 hr becomes limited by the refrigerator at lower temperatures, which is a buHt-in safety feature. The refrigerator and cool-down rate are weIl matched. The glass is warmed to room temperature in about 50 hr by circulating hydrogen gas through the refrigerator.

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