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Experimental Setup

We converted a 19 inch bell jar evaporator into a plasma discharge system (see Figure 2). A Nd-B-Fe cylindrical magnet, 1cm radius and 1cm thick with surface field approaching 5 kG, was mounted on a stainless rod through a rotating feedthrough to a computer controlled motor. Two high voltage electrodes were mounted on either side of the magnet, each with its own high voltage power supply. Fragments of a Sylvania Cool-White fluorescent tube were used, glass side up as an X-ray detector, phosphor side up as an electron detector. A roughing pump was used to bring the pressure of the system down to a value of $\sim$ 20 mTorr. A needle leak valve was used to establish higher pressures by bleeding in either Nitrogen or Helium gas. Several digital cameras were used to take pictures, beginning with two 8-bit color cameras followed by two 16-bit astronomy cameras.


Rob Sheldon 2001-03-09