Generation of liquid helium temperatures using a lead regenerator in a GM precooled pulse tube stage

✍ Scribed by A von Schneidemesser; G Thummes; C Heiden

• Book ID: 104112563
• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 185 KB
• Volume: 40
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(99)00131-9

✦ Synopsis

This paper describes the cooling performance of a pulse tube stage extending to room temperature which is precooled by a singlestage GM refrigerator. With this system it was possible to reach liquid helium temperatures without using rare earth compounds as regenerator material. Instead the regenerator was ®lled with conventional lead spheres. With the regenerator warm end being at a precooling temperature of about 31 K a minimum no-load temperature near 4.2 K at the cold end of the pulse tube was achieved. This no-load temperature is considerably lower than what has been achieved before by two-stage regenerative refrigerators which operate without rare earth material and attain typically no-load temperatures above 6 K when operated with lead in the coldest regenerator section. In the presented hybrid system a cooling power of 10 mW at 4.6 K, 100 mW at 6 K and 1 W at 9.2 K was achieved using a 6 kW helium compressor.