[Sneap] GVM needed for General IonX Tandetron

[Van Deusen, Stuart B]

I'm not sure if this helps, but the Rotron part number for the GVM motor
in our HVEC AN is 020852.  Best of luck.
 
Stuart Van Deusen
 
----------------------------------------------------------- 
Stuart B. Van Deusen 
Radiation Solid Interactions and Processing 
Dept. 1111, M/S 1056 
Sandia National Laboratories 
P.O. Box 5800 
Albuquerque, NM  87185-1056 
PH (505)844-7782 
FAX (505)844-7775 
e-mail:  sbvande at sandia.gov 


________________________________

From: sneap-bounces at tunl.duke.edu [mailto:sneap-bounces at tunl.duke.edu]
On Behalf Of Howard Evans
Sent: Wednesday, January 16, 2008 2:26 PM
To: Symposium of Northeastern Accelerator Personnel
Subject: [Sneap] GVM needed for General IonX Tandetron



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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