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Re: Dead xray transformer (fwd)
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To: tesla@pupman.com
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Subject: Re: Dead xray transformer (fwd)
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From: Tesla List <mod1@pupman.com>
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Date: Sun, 29 Mar 1998 21:46:50 -0700 (MST)
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Approved: mod1@pupman.com
---------- Forwarded message ----------
Date: Sun, 29 Mar 1998 19:43:37 PST
From: Bill the arcstarter <arcstarter@hotmail.com>
To: jimlux@earthlink.net, tesla@pupman.com
Subject: Re: Dead xray transformer
Jim, fellow coilers,
Some comments:
>Perhaps it was a Flash X-ray pulsed unit? These use a small Marx bank
>charged to 100 kV stage voltage to produce very short, intense pulses
>of 300 kV - 1 MV xrays.
I have some info on this process - gleaned from a Westinghouse
Industrial electronics book circa 1944. I could post it if there is any
great interest...
This process is used these days to examine high speed events such as
munitions detonation, shaped-charges, etc. I don't know if they still
use a Marx setup, or something with a bit less "jitter" in the firing
delay.
>This is how my Xray unit works. It senses the current in the HV
>secondary (between the two HV windings, near ground potential) and
>then modulates the power going to the filament to adjust the current
>to the nominal 100 mA. Of course, there is all sorts of other stuff
>to start the exposure with a good guess as to the filament current,
>and so on.
Hmm - I don't believe our system does that - its mostly open loop most
of the time. I'll inquire and let you know. Initial calibration is
performed using step-wedge exposures, etc, to prove actual KV and MA
measurements of the exposure.
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