A throttling-type hydrogen-helium liquefier (VGO1) with a capacity of 40-42 liter/h of liquid helium (in the collector) has been developed at the Joint Institute for Nuclear Studies. The hydrogen unit of the device is installed in a separate Dewar vessel and can operate as an independent hydrogen liquefier. It has been described in [1, 2]. In the helium unit, the preliminary cooling is by liquid nitrogen boiling at atmospheric pressure and by liquid hydrogen boiling in vacuum.Experience showed that about 35-4070 less helium flows into the Dewar vessels than is formed in the liquefier collector. This efficiency loss may be caused by the evaporation due to throttling during the flow of helium from the collector into the Dewar vessels, by the absorption of heat in discharge valves, by the evaporation during the cooling of Dewar vessels and by the entrainment of liquid droplets, etc.
(i)where H is the quantity of helium left in the Dewar vessel, G is the quantity of cooled helium fed into the liquefier; and r is the percentage of liquid left during throttling from the collector pressure to the Dewar vessel pressure.The degree of liquefaction at the collector pressure equal to the Dewar vessel pressure (it is assumed to be 1.0 atm) can be expressed as H,-h r ,,--.
To obtain a beam of polarized deuterons, a cryogenic source "Polaris" has been developed according to the program of research at the Dubna synchrophasotron/1/. The source is installed on a high-voltage terminal of the linac preaccelerator. A beam of deuterons from the source is accelerated in the synchrophasotron/2/. At present the source is being improved. A polarimeter with 3He and 4He targets has been developed to measure the polarization of the beam of deuterons after the linac. Results of this work are presented in the report
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