Details

Autor(en) / Beteiligte

• Qiu, L.M.
• Cao, Q.
• Zhi, X.Q.
• Gan, Z.H.
• Yu, Y.B.
• Liu, Y.

Titel

A three-stage Stirling pulse tube cryocooler operating below the critical point of helium-4

Ist Teil von

• Cryogenics (Guildford), 2011-10, Vol.51 (10), p.609-612

Ort / Verlag

Kidlington: Elsevier Ltd

Erscheinungsjahr

2011

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• ► A separate three-stage Stirling type pulse tube cooler (SPTC) was investigated. ► A cold inertance tube was introduced into the third stage as a good phase shifter. ► The cooler reached a bottom temperature of 4.97 K using only helium-4 not helium-3. ► It is the first time a temperature below 5 K in a 3-stage SPTC with frequency at 30 Hz. Precooled phase shifters can significantly enhance the phase shift effect and further improve the performance of pulse tube cryocoolers. A separate three-stage Stirling pulse tube cryocooler (SPTC) with a cold inertance tube was designed and fabricated. Helium-4 instead of the rare helium-3 was used as the working fluid. The cryocooler reached a bottom temperature of 4.97 K with a net cooling power of 25 mW at 6.0 K. The operating frequency was 29.9 Hz and the charging pressure was 0.91 MPa. It is the first time a refrigeration temperature below the critical point of helium-4 was obtained in a three-stage Stirling pulse tube cryocooler.