[tt] Next Big Future - 2 new articles
Eugen Leitl
<eugen at leitl.org> on
Tue Jun 3 20:55:00 UTC 2008
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Subject: Next Big Future - 2 new articles
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"[2]Next Big Future" - 2 new articles
1. [3]New Iron based superconductors might resist magnetic fields
over 100 Tesla
2. [4]Focus Fusion Follow Up
3. [5]More Recent Articles
4. [6]Search Next Big Future
[7]New Iron based superconductors might resist magnetic fields over 100
Tesla
[8]Researchers at the National High Magnetic Field Laboratory at
Florida State University have discovered that the new [9]iron based
family of superconducting material kept superconducting all the way up
to 45 tesla. [10]45 Tesla is the most powerful magnet sustained field
in the world. The researchers did not find the upper limit for
magnetic field resistant superconductivity for the new material.
Scientists are calling the material "doped rare earth iron
oxyarsenides".
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The new superconductors seem like they will be able to make improved
MRI machines and research magnets, a new generation of superconducting
electric motors, generators and power transmission lines.
Tesla is a unit of magnetic field strength; the Earth's magnetic field
is one twenty thousandth of a tesla.
A high tolerance for magnetic field is one of three key properties
researchers hope for in superconductors. Also desirable are the
abilities to operate at relatively high temperatures and in the
presence of high electrical currents. Superconductors are used to
make MRI and research magnets, and now they are being tested in a
new generation of superconducting electric motors, generators,
transformers and power transmission lines. Today, the most powerful
superconducting magnet generates a field of about 26 tesla. If a
superconductor could be found that tolerates a higher current and
field, it may make possible more powerful magnets, opening up vast
new research areas to scientists and power applications.
Based on both theoretical calculations and what we're seeing from
the experiments, it seems likely that this is a completely
different mechanism for superconductivity. If it's found that these
materials can support high current densities, then they could be
tremendously useful.
[17]The hybrid 45 tesla magnet site
[18]The Magnet Lab's 100-tesla multi-shot, currently the most-powerful
reusable magnet in the world. Designed to operate at 100 teslas, the
multi-shot has so far been kept to 89.9 teslas, still a world record.
100-tesla multi-shot magnet, with its central insert coil being
loaded.
All of the highest-field magnets are pulsed: a single swift current
pulse sent through the assembly creates a field that rises, peaks,
and decays (typically) within a few thousandths of a second. The
short duration limits the heat and stress on the materials, so the
highest fields can be contained without destroying the magnet.
The Los Alamos team is currently investigating how the Fermi
surface evolves as the cuprate's composition changes. In comparing
all the data (including the controversial results from an
experiment conducted at Los Alamos in 1991), one sees dramatic
changes in the Fermi surface as the materials get closer to the
number of dopants that is optimum for the highest superconducting
temperature. The Magnet Lab is continuing its quest to produce
higher fields. Indeed, Mielke is spearheading a new electromagnet
design, the "single-turn," named for its single loop of copper. The
single-turn has already produced pulsed fields as high as 240
teslas. The field lasts but a few millionths of a second, and
then--the magnet explodes! Remarkably, the magnet's design allows a
sample to survive the explosion intact.
Mielke is planning to use the single-turn to measure the Fermi
surface of plutonium and to investigate superconductivity in the
heavy-electron metals, but he needs to refine his measurement
techniques. "A changing magnetic field can generate an unwanted
voltage--electromagnetic interference (EMI)--in the measurement
probe," he explains. "It's hard enough to measure small signals in
the 100-tesla magnet, where the field goes from nothing to
everything in a few thousandths of a second. When the field ramps
up in the single-turn's millionth of a second, the EMI is much
higher, and the measurement becomes that much harder."
[19]Pulsed fields of microseconds up to 300 Tesla are possible and the
100 tesla multi-shot can get 90 tesla for 25 milliseconds.
FURTHER READING
[20]From Nature the research paper, Two-band superconductivity in
LaFeAsO0.89F0.11 at very high magnetic fields
Researchers report resistance measurements of LaFeAsO0.89F0.11 at high
magnetic fields, up to 45 T, that show a remarkable enhancement of the
upper critical field B c2 compared to values expected from the slopes
dB c2/dT 2 T K-1 near T c, particularly at low temperatures where the
deduced B c2(0) 63-65 T exceeds the paramagnetic limit. They argue
that oxypnictides represent a new class of high-field superconductors
with B c2 values surpassing those of Nb3Sn, MgB2 and the Chevrel
phases, and perhaps exceeding the 100 T magnetic field benchmark of
the high-T c copper oxides.
[21]The new iron based superconductors could open up a new path to
room temperature superconductors
[22][advancednano?i=F6o2BP]
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[39]Focus Fusion Follow Up
[From a reader who is a close follower of Focus Fusion]
Re: [40]CMEF [Just reported funding of $600,000 part of $10 million],
Eric [Founder and CEO of LPP] responded, "This is based on
years-out-of-date info. The $600,000 never actually materialized, but
LPP is again at the point where we think we will have money in hand
very soon. But this time we will not say we have it until the bank
tells us we do."
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The most recent LPP news postings are:
[47]LPP has performed some computer simulations of their process.
[48]Highly repeatable experiments have been performed
In a presentation to the Seventh Symposium on Current Trends in
International Fusion research, held a year ago, but recently
released on the Web, Dr. Jan Brzosko reported that in 500 shots a
DPF functioning at a peak current of 0.95 MA had neutron yields
that had a standard deviation of only about 15%.
[49]Focus fusion in Discover Magazine June 2008 (item #2).
It may sound too good to be true, but the technology, called focus
fusion, is based on real physics experiments. Focus fusion is
initiated when a pulse of electricity is discharged through a
hydrogen-boron gas across two nesting cylindrical electrodes,
transforming the gas into a thin sheath of hot, electrically
conducting plasma. This sheath travels to the end of the inner
electrode, where the magnetic fields produced by the currents pinch
and twist the plasma into a tiny, dense ball. As the magnetic
fields start to decay, they cause a beam of electrons to flow in
one direction and a beam of positive ions (atoms that have lost
electrons) to flow in the opposite direction. The electron beam
heats the plasma ball, igniting fusion reactions between the
hydrogen and boron; these reactions pump more heat and charged
particles into the plasma. The energy in the ion beam can be
directly converted to electricity--no need for conventional
turbines and generators. Part of this electricity powers the next
pulse, and the rest is net output.
A focus fusion reactor could be built for just $300,000, says
Lerner, president of Lawrenceville Plasma Physics in New Jersey.
But huge technical hurdles remain. These include increasing the
density of the plasma so the fusion reaction will be more intense.
(Conventional fusion experiments do not come close to the
temperatures and densities needed for efficient hydrogen-boron
fusion.) Still, the payoff could be huge: While mainstream fusion
research programs are still decades from fruition, Lerner claims he
requires just $750,000 in funding and two years of work to prove
his process generates more energy than it consumes. "The next
experiment is aimed at achieving higher density, higher magnetic
field, and higher efficiency," he says. "We believe it will
succeed."
[emails from a reader who has been following Focus fusion closely]
the power would be at about 0.2¢/kwh, not 1/20¢ (0.05¢). The
generators would be from 5-20MW, depending on pulse rate (330 -
1320/sec.) The energy "profit" is actually from harvesting as current
(via thousands of foil layers in the containment shell) the ~40% of
output which occurs as X-rays. The alpha-beam pulse goes back into the
capacitor bank to fire the next "shot", and the electron beam reheats
the plasma.
[50]A place for downloading animations and images.
[51][advancednano?i=2eR5X1]
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[301266262]
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More Recent Articles
* [68]Carnival of Space Week 56
* [69]Blacklight Power claims 50KW prototype Hydrinos generator
* [70]Focus fusion has agreement with CMEF of Sweden
* [71]Reproducible Cold Fusion Excess Heat experiment ?
* [72]Enhanced geothermal energy
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79. http://www.feedblitz.com/
80. http://www.feedblitz.com/
Hidden links:
81. http://www.feedblitz.com/t.asp?/64651/2987253/http://bp0.blogger.com/_VyTCyizqrHs/SECE3bU9CmI/AAAAAAAAAmc/q2oMKQHby2E/s1600-h/rareearthironcompound.gif
82. http://www.feedblitz.com/t.asp?/64651/2987253/http://bp1.blogger.com/_VyTCyizqrHs/SECJbRImRoI/AAAAAAAAAmk/dLYWCKuZSCo/s1600-h/cms-hybrid2.jpg
83. http://www.feedblitz.com/t.asp?/64651/2987253/http://bp1.blogger.com/_VyTCyizqrHs/SECLiinFdMI/AAAAAAAAAms/YflM6MbcliU/s1600-h/multishotmagnet.jpg
84. http://www.feedblitz.com/t.asp?/64651/2987253/http://bp0.blogger.com/_VyTCyizqrHs/SECMyPY-1PI/AAAAAAAAAm0/eu3u21W6hTw/s1600-h/240tesla.jpg
----- End forwarded message -----
--
Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
______________________________________________________________
ICBM: 48.07100, 11.36820 http://www.ativel.com http://postbiota.org
8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE
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