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4hv.org :: Forums :: High Voltage
<< Previous thread | Next thread >>   

Spiral impulse generator = rolled cap Blumlein induction coil!

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Author Post
Proud Mary
Thu Sep 02 2010, 09:24PM
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4808
The type I was interested in were the true transmission line VIGs, which can have rise times <10ns, according to the literature. With no means of investigation in the time domain, I looked at some of the more accessible properties of these interesting devices.
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Patrick
Thu Sep 02 2010, 09:36PM
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 4409
Proud Mary wrote ...

....which can have rise times <10ns....

wholly crap!
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Tesladownunder
Fri Sep 03 2010, 12:41AM
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1436
Patrick wrote ...

Proud Mary wrote ...

....which can have rise times <10ns....

wholly crap!

Holy crap or wholly crap convey rather different meanings.

I have an analog storage CRO to 100Mhz so can do something to 10ns period theoretically. I wouldnt like to put 30kV anything with a 10ns risetime anywhere near my CRO without some very clever protection circuitry that can respond to this speed and beyond. Not sure that a simple spark gap will cut it.
This generator has now been put away in one of over 100 boxes continaing various projects stacked in my shed, shipping container and lounge....

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Patrick
Fri Sep 03 2010, 01:45AM
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 4409
Tesladownunder wrote ...

Holy crap or wholly crap convey rather different meanings.



Tesladownunder wrote ...

I have an analog storage CRO to 100Mhz so can do something to 10ns period theoretically. I wouldnt like to put 30kV anything with a 10ns risetime anywhere near my CRO without some very clever protection circuitry that can respond to this speed and beyond. Not sure that a simple spark gap will cut it.
This generator has now been put away in one of over 100 boxes continaing various projects stacked in my shed, shipping container and lounge....


I could almost be certain your scope would survive if we did this in person, however if you live in australia and I in california, then maybe a DSO is cheaper then the plane ticket.

Anyway risk is part of scientific advancement.
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Proud Mary
Fri Sep 03 2010, 10:04AM
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4808
5.2 ns was the fastest rise time I could find in the literature, in this harmful-sounding device. I see Larry "Doomsday" Altgilbers is one of the authors, whom many here will remember as a co-inventor of the "Gatling Marx Generator" contraption:

Rev. Sci. Instrum. 77, 043904 (2006); doi:10.1063/1.2168674 (5 pages)
Completely explosive ultracompact high-voltage nanosecond pulse-generating system
Sergey I. Shkuratov1, Evgueni F. Talantsev1, Jason Baird1, Millard F. Rose2, Zachary Shotts2, Larry L. Altgilbers3, and Allen H. Stults4

1Loki Inc., Rolla, Missouri 65409
2Radiance Technologies, Inc., Huntsville, Alabama 35807
3U.S. Army Space and Missile Defense Command, Huntsville, Alabama 35807
4U.S. Army Aviation and Missile Research, Development, and Engineering Center, Alabama 35898


(Received 30 October 2005; accepted 2 January 2006; published online 10 April 2006)

A conventional pulsed power technology has been combined with an explosive pulsed power technology to produce an autonomous high-voltage power supply. The power supply contained an explosive-driven high-voltage primary power source and a power-conditioning stage. The ultracompact explosive-driven primary power source was based on the physical effect of shock-wave depolarization of high-energy Pb(Zr52Ti48)O3 ferroelectric material. The volume of the energy-carrying ferroelectric elements in the shock-wave ferroelectric generators (SWFEGs) varied from 1.2 to 2.6 cm3. The power-conditioning stage was based on the spiral vector inversion generator (VIG). The SWFEG-VIG system demonstrated successful operation and good performance. The amplitude of the output voltage pulse of the SWFEG-VIG system exceeded 90 kV, with a rise time of 5.2 ns.

© 2006 American Institute of Physics
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Superkuh
Fri Oct 28 2011, 11:53PM
Registered Member #59
Joined: Thu Feb 09 2006, 05:45AM
Location: Wisconsin, USA
Posts: 12
[Oops. Nope]

Sorry to dig up such a long dead thread, but while reading about the development of the steamer chambers at the Standford Linear Accelerator I found a very interesting appendix about a type of spiral impulse generator using 0.002-to-0.005 ~inch copper foil cut to a double tabpe and attached to a sheet of polyethylene or mylar insulation with ~15-20 turns with max widths (b_max) of the copper foils from 10 to 60cm. Normal.

But...It is abnormal in that the detail construction diagrams and instructions call for the addition of a copper sulfate soaked toilet paper layer around the tapered edges left open by the copper. These are soaked in the CuSO4 and then the water removed under vacuum leaving the copper sulfate precipitate. This is over tens of minutes. Claims of less edge breakdown and edge voltage gradient are suggested. Performance is very good.


vector-inversion_autotransformers_design__jc_martin__i_smith.pdf

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jpsmith123
Sat Oct 29 2011, 01:46PM
Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 693
The device shown is actually a transformer - a spiral strip transformer (in this case an autotransformer), which looks similar to a spiral vector inversion generator but isn't.
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