A gas flow cryostat for radio frequency measurements

✍ Scribed by R.H. Mitchell; P.C. Riedi; M. Robertson

• Publisher: Elsevier Science
• Year: 1973
• Tongue: English
• Weight: 267 KB
• Volume: 13
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(73)90007-6

✦ Synopsis

Whereas the observed pressure oscillations at the warm end were normally sinusoidal, in these very vigorous oscillations in the U-tube we observed deviations from the sinusoidal shape. The rise of the pressure was steeper than the following fall. The effect apparently became stronger with decreasing average pressure P0. If we denote the time distances between two extrema of the pressure-time curve as a and b (Fig. ), we measured ratios ofb/a up to 1.5. This value was measured at a total pressure of p0 = 27 torr (1 torr = 133 N m "2) with pressure amplitudes ofp A = 9 torr.

We are not yet sure whether this effect has its origin in our pressure measuring system or whether it is a real property of the oscillations.