Re: best dielectric?

• To: tesla-at-pupman-dot-com
• Subject: Re: best dielectric?
• From: "Reinhard Walter Buchner" <rw.buchner-at-verbund-dot-net> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Mon, 22 Feb 1999 17:57:16 -0700
• Approved: twf-at-verinet-dot-com

Hello Bryan,


Sorry for this late reply.


I wrote:
">> Here are a few interesting specs about the dielectric losses for
each
>> material.
>> I am guessing you want to use it for (TESLA) cap construction.
>>
>> Frequency = 10^6Hz
>> --------------------------
>> PP:            <5*10^-4
>> HDPE:        2*10^-4
>> UHMWPE: Sorry, no info
>> PC:               1*10^-2
>> PS:                0.5-4*10^-4"

You asked:

"What are the units or fractions here? Is this Power loss? or energy
loss?"

These numbers are called dielectric loss factor (the higher
the number, the greater the loss). This number (a greek letter,
canīt draw this in ascii) is a definition for the loss of energy in
a piece of dielectric material being subjected to an AC E-field.

This loss of energy results in the heating of the material. The
loss value (important to know) depends on the material and
the frequency it is being subjected to. This number is not only
important for us coilers, but also for the plastic industry.

Materials with high RF losses are not usable as cap dielectric,
but they can be welded in an RF field (which is actually what
some plastic manufacturers do).

Coiler greets from germany,
Reinhard

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