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JOB DESCRIPTION
Vacancy Ref: N593
Job Title: Laboratory Technician (part-time, 20%; for 1 year
renewable) Present Grade:5
Department/College: Department of Physics
Directly responsible to: Prof P V E McClintock
Supervisory responsibility for: None
Other contacts
Internal:
Prof S N Fisher, Dr M Poole, other academic staff, postdocs and
PhD students in the ULT group; Safety Officer;
technicians in physics mechanical and electronics workshops;
liquefier technician.
External:
Purchasers and potential purchasers of isotopically pure4He
(world-wide); Prof Ken Farley (Caltech, Pasadena);
other isotopic analysis facilities as/when needed; suppliers and
maintenance companies for cryogenic and highpressure equipment;
international shippers for export of isotopically pure
4He.
Major Duties:
The main duty is to maintain, run, and enhance the operation of
the4He isotopic purification plant, including
1.
Establishing a set of procedures and running conditions that
will enable helium gas of3He/
4He isotopic
ratio near or below 10-12
to be prepared reliably. Currently, the system sometimes
operates to this
specification, but not always. It will be necessary to
understand the superfluid heat flush process in detail,
as well as to examine and analyse possible sources of isotopic
contamination.
2.
Considering possibility of a cleaner to remove contaminants such
as oil vapour and air, between thecompressor and the cylinder bank;
if feasible, designing, and implementing it.
3. Running the system on a regular basis, using the procedures
established under item 1, often enough to
build up a stock number of at least 6 cylinders of
