Development is continuing and we are cutting exotic metal. This is a very slow and tedious process that takes plenty of time and failure through haste would be inexcusable. Yet it will be here soon enough.
What i would like to experiment with once they have this configuration working is to apply what we are calling the modulator. This may produce a coherent electron flow that will run cool and avoid a lot of wastage. That may be enough to take the system smoothly over the top and sustain the process.
Right now we can produce a clean one quarter inch ribbon that is ten inches long in a vacuum and we have no idea what our limits really are. What we do know is that it produces coherence we can feel out to a ten foot radius..
Tungsten Cathode Nears Completion after Long Delays
The long-awaited tungsten cathode is finally nearing completion in a
Chinese factory. According to the latest reports by California-based
Tungsten Heavy Powder(THP), which is performing the work in China,
machining will be complete within a few weeks and delivery to LPPFusion
should occur by mid-February. The 99.95% pure tungsten piece has been in
the machining process for nearly two months. Because pure tungsten is
as brittle as ceramic and liable to cracking, the part must be removed
from machining frequently and heat-treated to relieve internal stress.
“We know that it seems the vital electrode is always two months in
the future, sort of like fusion but with a shorter time line,” comments
LPPFusion President and Chief Scientist Eric J. Lerner, “but this time
we know the final stages of machining are actually underway.” (see
Figure 1)
Fig
1- Tungsten cathode undergoing machining in China on Nov 19, two weeks
into the two-month long process. Note the 16 vanes emerging from the
tungsten blank. The inward-facing surfaces of the vanes will carry the
current once the finished piece in in FF-1.
The long wait for the tungsten cathode comes from the inherent
technical difficulty of the part, which is pressing close to the limits
of present day tungsten technology. Since tungsten melts at a higher
temperature than any other material, it can’t be poured and cast.
Instead tungsten powder is pressed or sintered together at high pressure
and temperatures to form a solid piece. This process makes it difficult
to form thick pieces and the monolith tungsten cathode is over 15 cm
tall. No factory outside of China is now equipped to make such a thick
pure-tungsten piece.
This technical difficulty has led to long delays. While LPPFusion
decided to make the monolithic tungsten cathode in May 2013, the initial
supplier, also in China, fell through when it increased the estimated
cost abruptly ten-fold to over $140,000. When no other supplier was
willing to complete the part, LPPFusion contracted with THP to produce a
cone-shaped blank and with a NJ-based company to machine the final
shape, a process that was supposed to be completed by June, 2014.
Unfortunately the NJ company first decided that a third firm was needed
for initial machining of the part (see Cathode Gets More Machining) and then backed out of the deal entirely, citing too much technical risk.
Finally THP agreed to make the part start-to-finish and, after getting corrections on an aluminum model (see Tungsten Anode Goes Into FF-1; Aluminum Cathode Model Is Checked), began machining a new blank at the beginning of November. The entire machining process will take about two months.
Given the extreme difficult of making the tungsten cathode, why does
LPPFusion not go directly to the final beryllium electrodes? The answer
is that tungsten, with its extreme resistance to heat, is the lowest
risk material for the next step of our experiment. We need to eliminate
evaporation of the electrode and the resulting impurities to get a jump
in the density of our plasmoid, and in the resulting fusion energy
output or yield. We have firm experimental evidence that tungsten does
not erode under the condition FF-1 is currently running. While we have
developed and published well-founded theories of how pre-ionization can stop erosion
of much less heat-resistant materials like beryllium, we still need to
test those theories experimentally. That we can do safely with tungsten,
with risking damage to the electrodes or disappointing fusion results.
In this way we will confirm or refine the theories and technique, paving
the way for the beryllium electrodes.
Those beryllium electrodes will be ready when we need them. We expect
to order them in January, with delivery in the first half of 2015.
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