Suppression of magnetic field fluctuations in cryogenic experiments

✍ Scribed by J. Votruba; M. Sott

• Publisher: Elsevier Science
• Year: 1966
• Tongue: English
• Weight: 224 KB
• Volume: 6
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(66)90122-6

✦ Synopsis

E v ER V O N E who employs low temperatures must encounter sonic vibrations in vessels containing liquid helium, which leads to its violent evaporation. This unpleasant phenomenon arises when tubes (for example, filling siphons) are introduced into the liquid helium and are closed at one end. In studying the sonic vibrations in siphons (with the help of a microphone) we found a simple means of preventing it-introducing into the lower end of the siphon a small t Received by PTI~ Editor, 11 June 1964: Pribory i Tekhnika l~ksperimenta No. 4, p. 251 (1965).

(3-5 cm) length of woollen thread. This simple arrangement makes it even possible to leave the siphon permanently in the container without introducing a noticeable increase in evaporation. Apparently the thread acts as a damper, preventing self-oscillation of the column of liquid inside the tube.