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Experimental investigations of a two-stage pulse tube cryocooler operating down to 3.5 K.

Author(s) : SHAFI K. A., MOHAMMED SAJID N. K., ABDUL RASHEED K. K., et al.

Summary

A two-stage pulse tube cryocooler is developed with a no-load temperatures of 3.5 K in the second stage and about 64 K in the first stage at an operating frequency of 1.6 Hz. The system gives a cooling power of about 250 mW at 6.5 K in the second stage. It uses stainless steel meshes (size 200) and lead for the first stage regenerator. Combinations of lead and Er3Ni are used for the second stage regenerator. A helium compressor (6 kW) and an indigenously developed rotary valve generate the pressure oscillations. Studies conducted with several configurations indicate that the pulse tube dimensions are more critical compared to those of regenerator to achieve low temperatures. Also the system performance improved with the proper design of cold end heat exchangers with minimum flow impedance. These results along with cooling power characteristics of the cryocooler are discussed in this paper.

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Pages: 2006-3/ICEC III-C3

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Details

  • Original title: Experimental investigations of a two-stage pulse tube cryocooler operating down to 3.5 K.
  • Record ID : 2008-1041
  • Languages: English
  • Source: Multiconference CryoPrague 2006 (9th Cryogenics 2006, ICEC 21, ICMC'06)
  • Publication date: 2006/07/17

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