[Sneap] GVM needed for General IonX Tandetron

[Howard Evans]

SNEAPers:

The motor in the Generating Volt Meter (GVM), used to monitor and provide negative feed-back control of the terminal voltage in our 1.7 MV Tandetron, has stopped working after only twenty-seven years. Does anyone reading this message have a complete GVM assembly (including the weldment that attaches to the side of the accelerator tank) they don't need? It doesn't have to be in working order, although that would be nice. If we have to replace these things every twenty-five or thirty years, I would like to have a spare on hand.

Actually, what I really need right now is the motor. All I know about it at the moment (before I open the tank later this week) is it is a split-phase induction motor, with a 4 microfarad oil-paper phase-shifting capacitor, operating on single phase 208 VAC. It is General Ionex Corporation part number A-08723, which is probably meaningless in 2008, but may have made sense to someone in 1981 when it was penciled into a drawing.

As someone posted earlier in this forum, regarding ordinary versus premium bearings, we would like to invest in a motor with "premium" bearings in the hope that the motor will operate for a longer period of time.

I tried using the terminal voltage monitoring tap on the voltage-grading resistive divider to control the terminal potential... it seems to have been designed for this purpose originally... but the results are not satisfactory. The ion energy wanders at will and seemingly randomly. We want to do an implant that will take several days to complete, but we cannot spare someone to continuously monitor and re-adjust the beam energy and/or position. So I need to get this GVM repaired or replaced as soon as possible, if not sooner.

Howard B. Evans, Jr.
Engineer, Materials Laboratory
UES, Inc.
4401 Dayton-Xenia Road
Dayton OH  45432-1894

937-426-6900 ext. 116 (office and voice mail) or ext. 121 (lab)
937-426-5718 fax

hevans at ues.com e-mail
http://www.ues.com web site

"Things should be explained as simple as
possible, but not simpler." -- A. Einstein

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