[Sneap] Resistor strings needed

Thu Sep 6 09:27:55 EDT 2007

Ovidiu,
    I am not familiar with the types of resistors you are using but it
sounds like they are similar to the very old HVEC stick resistors that used
2 Watt carbon composition resistor inside a long phenolic tube.  These were
very poor resistors and we replaced those in our KN with the HVEC ³Blue²
stick resistors which were very stable.  In our FN, we did away with the
original HVEC resistor assemblies and built new ones based on a design at
LLNL and Penn.  We purchased and installed Caddock type MG resistors and
these performed  well although we did find that they were prone to spark
damage and had to replace a lot of them.  We changed to EBG type SSX
resistors and these have been essentially failure free.  I would look into
designing new resistor assemblies based on these modern high voltage
resistors.  It takes some effort and expense but the payoff is huge.
Regards,
- Chris
-- 

Chris R. Westerfeldt
Research Scientist / T.U.N.L. Radiation Safety Manager
Duke University Physics Department &
Triangle Universities Nuclear Laboratory
Science Drive, Box 90308
Durham, NC  27708-0308
Tel: (919) 660-2600
Fax: (919) 660-2634
Email: Cwest at Tunl.Duke.Edu

From: "Toader, Ovidiu" <ovidiu at umich.edu>
Reply-To: Symposium of Northeastern Accelerator Personnel
<sneap at tunl.duke.edu>
Date: Tue, 4 Sep 2007 09:21:14 -0400
To: <sneap at tunl.duke.edu>
Conversation: Resistor strings needed
Subject: [Sneap] Resistor strings needed

The ATF-SNEAP 2006 meeting was held in Australia and information is
available at:
http://www.ansto.gov.au/nugeo/conference/private/ATF_SNEAP.htm

++++++++++++++++++++++++++++++++++++

The SNEAP 2007 meeting will be hosted by Brigham Young University in Salt
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http://webpub.byu.net/wsd/.
The 41st SNEAP Conference
Brigham Young University
October 7 - 11, 2007

Please note:
DUE TO THE ORIGINAL ANNOUNCEMENT BEING LOST IN CYBER-SP[ACE, THE
SUBMISSION DATE HAS BEEN EXTENDED TO September 15th

Call for Papers: 

Brigham Young University in sponsoring the 41st Conference of the
Symposium of North Eastern Accelerator Personnel (SNEAP) on October 7-
11, 2007. The conference will be held at the Embassy Suites Hotel in
Salt Lake City, Utah.

The SNEAP Conference is directed toward scientists and technical staff
who are involved in developing, upgrading, and operating electrostatic
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Greetings!

We have serviced our General Ionex accelerator and we have many resistors
that are failing (mainly because of age)
Does anyone have any resistor strings that were pulled out from a HVEE
machine and could give/sell some to us?
We mainly need 140 MOhm strings (23 resistors each 6.2) and 506 MOhm (23
resistors each 22 MOhm).  O¹Brien Scientific can give us some but not enough
(The resistors are rated 2 W).
A source of such new resistors could also be valuable information for us.

Thank you,

Ovidiu
MIBL, UM

*******************************************
Ovidiu Toader,
Manager, Michigan Ion Beam Laboratory
University of Michigan, Ann Arbor MI 48109
http://www-ners.engin.umich.edu/research/Mibl
ovidiu at umich.edu
(734) 936-0166
*******************************************
Ex nihilo nihil ...      (Parmenides)
*******************************************

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