Abstract
We describe a simple inexpensive laboratory for undergraduate students wherein the students construct and test Clarke slugs. Displaying the I-V relationship for the slug on an oscilloscope, the student observes the dc and ac Josephson effects, self-induced steps, measures the Bessel function dependence of the ac effect with power, determines the flux quanta by magnetically modulating a double-junction Clarke slug, and ascertains e/h to ±O.4%. The experiment requires only a helium storage dewar and a Gunn oscillator as a microwave source in addition to readily available laboratory equipment. Detailed sections on slug preparation and trouble-shooting are included.
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