[FoRK] [Fwd: [>Htech] /. sonofusion results confirmed in four other
Joseph S. Barrera III
joe at barrera.org
Mon Apr 19 09:00:16 PDT 2004
-------- Original Message --------
Subject: [>Htech] /. sonofusion results confirmed in four other
Date: Tue, 20 Apr 2004 01:08:42 +1000
From: Alejandro Dubrovsky <alito at organicrobot.com>
Reply-To: transhumantech at yahoogroups.com
To: transhumantech <transhumantech at yahoogroups.com>
Researchers Report Bubble Fusion Results Replicated
Source: Physical Review E
[Apr 16, 2004]
Four other institutions confirm and extend sonofusion findings
TROY, N.Y. - Physical Review E has announced the publication of an
article by a team of researchers from Rensselaer Polytechnic Institute
(RPI), Purdue University, Oak Ridge National Laboratory (ORNL), and the
Russian Academy of Science (RAS) stating that they have replicated and
extended previous experimental results that indicated the occurrence of
nuclear fusion using a novel approach for plasma confinement.
This approach, called bubble fusion, and the new experimental results
are being published in an extensively peer-reviewed article titled
"Additional Evidence of Nuclear Emissions During Acoustic Cavitation,"
which is scheduled to be posted on Physical Review E's Web site and
published in its journal this month.
The research team used a standing ultrasonic wave to help form and then
implode the cavitation bubbles of deuterated acetone vapor. The
oscillating sound waves caused the bubbles to expand and then violently
collapse, creating strong compression shock waves around and inside the
bubbles. Moving at about the speed of sound, the internal shock waves
impacted at the center of the bubbles causing very high compression and
accompanying temperatures of about 100 million Kelvin.
These new data were taken with an upgraded instrumentation system that
allowed data acquisition over a much longer time than was possible in
the team's previous bubble fusion experiments. According to the new
data, the observed neutron emission was several orders of magnitude
greater than background and had extremely high statistical accuracy.
Tritium, which also is produced during the fusion reactions, was
measured and the amount produced was found to be consistent with the
observed neutron production rate.
Earlier test data, which were reported in Science (Vol. 295, March
2002), indicated that nuclear fusion had occurred, but these data were
because they were taken with less precise instrumentation.
"These extensive new experiments have replicated and extended our
earlier results and hopefully answer all of the previous questions
surrounding our discovery," said Richard T. Lahey Jr., the Edward E.
Hood Professor of Engineering at Rensselaer and the director of the
analytical part of the joint research project.
Other fusion techniques, such as those that use strong magnetic fields
or lasers to contain the plasma, cannot easily achieve the necessary
compression, Lahey said. In the approach to be published in Physical
Review E, spherical compression of the plasma was achieved due to the
inertia of the liquid surrounding the imploding bubbles.
Professor Lahey also explained that, unlike fission reactors, fusion
does not produce a significant amount of radioactive waste products or
decay heat. Tritium gas, a radioactive by-product of deuterium-deuterium
bubble fusion, is actually a part of the fuel, which can be consumed in
deuterium-tritium fusion reactions.
Researchers Rusi Taleyarkhan, Colin West, and Jae-Seon Cho conducted the
bubble fusion experiments at ORNL. At Rensselaer and in Russia,
Professors Lahey and Robert I. Nigmatulin performed the theoretical
analysis of the bubble dynamicsand predicted the shock-induced
pressures, temperatures, and densities in the imploding vapor bubbles.
Robert Block, professor emeritus of nuclear engineering at Rensselaer,
helped to design, set up, and calibrate a state-of-the-art neutron and
gamma ray detection system for the new experiments.
Special hydrodynamic shock codes have been developed in both Russia and
at Rensselaer to support and interpret the ORNL experiments. These
computer codes indicated that the peak gas temperatures and densities in
the ORNL experiments were sufficiently high to create fusion reactions.
Indeed, the theoretical shock code predictions of deuterium-deuterium
(D-D) fusion were consistent with the ORNL data.
The research team leaders are all well known authorities in the fields
of multiphase flow and heat transfer technology and nuclear engineering.
Taleyarkhan, a fellow of the American Nuclear Society (ANS) and the
program's director, held the position of Distinguished Scientist at
ORNL, and is currently the Ardent Bement Jr. Professor of Nuclear
Engineering at Purdue University. Lahey is a fellow of both the ANS and
the American Society of Mechanical Engineers (ASME), and is a member of
the National Academy of Engineering (NAE). Nigmatulin is a visiting
scholar at Rensselaer, a member of the Russian Duma, and the president
of the Bashkortonstan branch of the Russian Academy of Sciences (RAS).
Block is a fellow of the ANS and is the longtime director of the
Gaerttner Linear Accelerator (LINAC) Laboratory at Rensselaer. The
bubble fusion research program was supported by a grant from the Defense
Advanced Research Projects Agency (DARPA).
CONTACT: Theresa Bourgeois, Rensselaer Polytechnic Institute (RPI) (518)
276-2840 email: bourgt at rpi.edu also see:
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