Date: Wed, 2 Feb 2005 16:31:28 -0600

Author: "Papp, James J "

Subject: RE: Ring launcher / Thompson coil

Post:

Sam

All you need to do is put in a set of rectifiers, so the current always feeds through the coil in the same direction. Grab the schematic of an AC/DC converter off the web or a design pattern textbook. Then the current (and thus the B-Field) will vary in magnitude (depending on what caps you use), but not in direction, and the polarity of the final product will always be the same.

Jim Papp
College of Lake County


-----Original Message-----
From: sampere [mailto:sampere@physics.syr.edu]
Sent: Wednesday, February 02, 2005 9:56 AM
To: tap-l@listproc.appstate.edu
Subject: Re: Ring launcher / Thompson coil


If that's so, how can I degauss something with a similar setup?

Sam

Gerald Zani wrote:

> Sam asked:
>
>> How do you re-magnetize magnets with AC?
>
>
> I believe that the AC is used to make a B field pulse which is focused
> onto the material to be magnetized.
>
> A momentary pulse of high current AC is used to create a very big B
> field pulse for a short period of time. I think it is simply an
> electromagnet with a momentary contact switch that is used. A pole
> concentrator in the electromagnet is to guide and focus this B field
> pulse into a small area where the iron or alnico is placed.
>
> You could probably magnetize iron with your Thompson Coil?
>
>
> Am I right? JZ
>
>
>
>
>
> Gerald Zani e-mail: Gerald_Zani@brown.edu
> Manager of Demonstrations phone: (401) 863-3964
> Department of Physics FAX: (401) 863-2024
> Brown University Providence, RI 02912-1843 USA
>
> http://128.148.60.98/physics/demopages/demo/
> http://128.148.60.98/physics/userpages/staff/Gerald_Zani/index.html
>
> Do a little more of that work which you have confessed to be good,
> Which you feel that society and your most Just Judge rightly demand of
> you.
> Cultivate the tree which you have found to bear fruit in your soil.
> If you have any experiments you would like to try, try them.
> Now's your chance.
>
> Henry David Thoreau, Journal entry, 1850.

From dimarco@physics.montana.edu Wed Feb 2 17:44:07 2005

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