We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK


97% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Experiments on a high quality grid oscillating ...
View graph of relations

« Back

Experiments on a high quality grid oscillating in superfluid 4He at very low temperatures.

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>02/2010
<mark>Journal</mark>Journal of Low Temperature Physics
Number of pages6
<mark>Original language</mark>English


We have investigated a copper-mesh grid oscillating at its fundamental (0, 1) Bessel mode in superfluid 4He for temperatures 10< T <1500 mK at a pressure of P = 5 bar. The high quality factor (Q ∼ 10 to power 5) of the oscillator allowed us to observe new features of its response to a periodic drive which, at the lowest T, was found to depend on the prehistory of the helium. The experiments have confirmed the existence of two critical velocities, and we discuss whether these critical velocities are associated with quantized vortices.