As is known, a cold finger of a pulse tube cryogenic refrigerator does not contain moving mechanical components and,
therefore, is traditionally thought of as producing low vibration and having extended lifespan. Because of these
outstanding features, such cryogenic engines are especially attractive for use in a variety of vibration-sensitive
instrumentation, such as infra-red imagers, scanning electron microscopes (SEM), superconductive quantum interference
devices (SQUID), etc. However, even relatively low-level vibration produced by a cold tip of a pulse tube, resulting
from oscillation of a gas pressure along with a vibration transmitted from a compressor through a metallic gas transfer
tube, may sometimes appear to be excessive for the above vibration-sensitive applications.
By making an extensive use of the finite element analysis supported by the full-scale experimentation, the authors are
attempting to identify the sources of vibration occurring in a cold tip of a pulse tube.