[Sneap] GVM needed for General IonX Tandetron

[jhendrix]

Howard

  I purchased a new GVM motor from for our 1.7MV Tandetron HVEE in 1991
which had to be machined to fit.

  The motor is a EG&G Rotron, P/N 021284, PH 1, Series 329CF, U230, Hz
50/60.

  Hope this helps you.

 

Jack Hendriks

University of Western Ontario

Department of Physics and Astronomy

Physics and Astronomy Building

London, ON

Canada

N6A 3K7

 

Tel: 519 661-3803

Fax: 519 661-2033

Email: jhendrix at uwo.ca 

  _____  

From: sneap-bounces at tunl.duke.edu [mailto:sneap-bounces at tunl.duke.edu] On
Behalf Of Howard Evans
Sent: Wednesday, January 16, 2008 4:26 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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