If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Ive seen the typical fractals on peoples skin and ply wood, but is it with in our reach to do so in a solid block of acrylic? ive seen people strike with a nail the block and its created, but i dont know much else? is it capacitive?
ive googled abit, but they're largely random articles without details.
Registered Member #118
Joined: Fri Feb 10 2006, 05:35AM
Location: Woodridge, Illinois, USA
Posts: 72
Patrick wrote ...
Ive seen the typical fractals on peoples skin and ply wood, but is it with in our reach to do so in a solid block of acrylic? ive seen people strike with a nail the block and its created, but i dont know much else? is it capacitive?
ive googled abit, but they're largely random articles without details.
Patrick, making these requires a source of high-energy electrons. We use a 150 kW 5 MeV industrial electron beam (from a Dynamitron, a type of high-power DC accelerator) to inject electrons deep inside Plexiglas (PMMA). As the electrons crash into the PMMA, they lose their kinetic energy, ideally stopping about halfway through. With continued injection, a highly-charged negative space charge layer develops inside the specimen, while the outside accumulates a nearly matching amount of positive surface charge. The internal charge injection process is sometimes called "charge trapping". The result is a "plateless capacitor", where the potential difference between the inner and outer layers of the PMMA can easily exceed 2.5 MV. Even a small specimen can hold a large amount of electrostatic energy. When we hit the specimen with a sharp point, we create a small surface fracture, initiating dielectric breakdown between the inner and outer charge layers. If you look carefully, you can see fainter negative surface discharges spreading across the surface from the discharge point. Most of the stored energy is released (called "charge detrapping") in a high-current discharge lasting only hundreds of nS. The 12" x 12" x 1" specimen in the attached image held almost 1 kJ, and the discharge was estimated to be several kA.
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
High Voltage Fractal Patterns in Acrylic.
