The 14UD pelletron accelerator

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Abstract
The 14UD has evolved over the past two years from acceptance tests to an extremely reliable and convenient research tool well suited to heavy-ion physics research. The development of the open corona point distribution system with the reintroduction of tie wires eliminated problems with gradient control and point lifetime. Easy inspection of the open points is a valuable diagnostic aid when beam transport problems occur. Electromechanical remote actuators for functions in the terminal have been replaced with pneumatic ones driven by SF 6 at 50 psi above tank pressure. Foils are changed, sublimer pellet heaters switched and a high energy tube entrance aperture selected by these devices. Long experience running from 6 to 13 MV has convinced us that enclosed corona points would not make our operation any more convenient. The machine is quite stable with negligible tube and column corona currents. Because of this, the machine typically runs with only one chain at a time. Since installation of SF6 powered oilers for the chains, there have been no further problems of instability or breakage. An integral valve for the NEC stripper foil assembly has been installed to maintain the conditioned status of the tube during stripper foil changes. All main power wiring has been replaced with mineral insulated cable sheathed in copper. No degradation in insulation has been found

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