Thin film superconducting quantum interferometers

✍ Scribed by W. Richter; G. Albrecht

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 185 KB
• Volume: 15
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(75)90186-1

✦ Synopsis

Fig.1

The experimental arrangement room temperature He 4 gas was 1.5 x 10 -7 std cm 3 s q torr -1

The superfluid He 4 flow rate as determined from the level drop was 5.5 x 10 -2 cm 3 of liquid per second equivalent to 45 std cm 3 s -1 at 1.1 K.

Helium obtained in this way was analysed by mass spectrometry 6 and contained 0.4 -+ 0.2 parts per billion of He 3 (0.4 + 0.2 x 10-9). In reference 3 the purity was estimated to be better than 50 x 10 "9.

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