ARC REACTOR

     Most of us like Iron Man, right?  I don't know about you all, but I like him a lot.  It's not just because he was a genius, philantrophist etc...  It's because he is really cool.  Okay, now coming to the topic.  We all know about the Iron Man's Arc Reactor.  The thing which has saved his life till Iron Man-3, and powered his suit.  This post is about that Arc Reactor.  Interesting, right?



     Arc Reactor is basically an Electromagnet.  That's it.  We all know that an electromagnet can produce electric field and hence the current is produced to power his suit.  It can be a electromagnet, but to be precise it is  a nuclear fusion reactor.  The Stark Arc Reactor is most likely a Multi-Isotope-Radio-Decay-Cell.

     Let's break the sentence mentioned above to understand it clearly.  We all know that what is an Isotope is.  Isotope are the elements which have same atomic number but different mass number, clear.  The word Radio-Decay-Cell means Radioactive element which reacts to give electricity, by reducing itself to other element.  And, at last the word Multi means, there are multiple radioactive elements needed in order to complete this reaction.

     But, Arc Reactor is really fictitious one.  It is not real yet.  It is one of the point of interest which Marvel had provided us to research.  So, let us analyze the concept of Arc Rector, its process and how it is possible to make one in the real world in depth.



     So, let us have our first question here.
What is a nuclear fusion reaction?
     In Nuclear Chemistry, nuclear fusion is a reaction in which two or more atomic nuclei is combined to form one or more different atomic nuclei and sub-atomic particles such as protons and neutrons.  The difference in mass between the reactants and the products is manifested as either the release of energy or absorption of energy.



The full sized arc reactor looks like a toroidal "Tokomak" plasma containment system for standard "hot fusion".



Real world equivalent: ITER fusion reactor



     This type of fusion reactor exists today at research pilot scale.  The reactor pictured ITER is under construction, and it is planned to be the first nuclear fusion reactor large enough to produce a net gain of energy.  Basically, is smashes two isotopes of hydrogen, deuterium and tritium together at such high energies that they combine into one atom.  When they fuse, the reaction produces helium and a free neutron.  Critically, Helium+neutron has less mass when compared to Deuterium+tritium, and the missing mass is converted into energy.  That energy can be captured as heat to run the traditional steam-driven turbine (like the ordinary power plant).

     So, what does the arc reactor's torus (donut) shape tell us?  It means there are charged particle moving in a circle, contained by a magnetic field.  High-energy particles usually has high energy because they are moving very fast, and the magnetic fields can curve the motion of the charged particles.  Curving the particles motion into a circle keeps them in one place long enough to make them collide.

     You may notice that current fusion reactors designs have a lot of magnetic coils on the outside of the torus, whereas the Stark Industries Arc Reactor has a viewing window.  Plasma containment is the single biggest challenge for hot fusion, but the arc reactor makes it look effortless.  From this we can conclude that the key technology to the full scale arc reactor is a way to contain the reaction in a self-sustaining ring.  This line of reasoning is definitely backed up by the toroidal view lines drawn in the Stark Industries Arc Reactor blueprints:



     There is also a remarkable lack of cooling loops, turbines, or anything that a traditional thermal reactor would require.  This means that the arc reactor produces electricity directly, rather than by first generating heat.  This observations goes with the fact that the mega-watt scale reactor in Tony's chest does not roast him alive.  So, it cannot be a hot-fusion reactor, or a traditional thermal fission reactor.

     What else we know about the miniature arc reactor?

  1. Contains a palladium core.
  2. The palladium is damaged by neutrons, so the specific isotope is important.
  3. Has electromagnetic coils in a torus.
  4. Emits blue-white light.
  5. Can be built in a cave with tools of moderate complexity.
  6. Requires no exotic materials outside what you could scavenge from dismantled conventional weapons systems.
  7. Runs low on power at inconvenient times, meaning it must have some sort of fuel or consumed charge.
     Palladium has been proposed as a substrate for "cold" fusion that does not requires hot plasmas and containment toroids, but this concept is widely discredited in the real world.  Palladium does, however, have some interesting capture and decay properties.

     Palladium isotope Pd-103 produces Rh-103 (Rhodium) via electron capture.  This means an inner electron is absorbed by the nucleus, merging with a proton to produce a neutron and an energetic photon -- gamma ray.
     Another isotope, Pd-107 produces, Ag-107 (silver) via beta decay, releasing an electron when a neutron turns into a proton, (This is the kind of a opposite reaction mentioned above).  Now, in real world physics, the electron balances the resulting atomic nuclei -- silver and rhodium have different number of protons from palladium, and the produced or consumed electrons just balance out the proton count, so there is no net flow of electricity.


     I propose that Howard Stark found a way to utilize the beta-decay of Pd-107 ions as an electron source for the electron capture of Pd-103, thereby producing an electric circuit between the two radioactive isotopes.  Pd-103 is very radioactive isotope ( half-life time is 17 days) when compared  to Pd-107 (6.7 million years half-life time) so there would need to be dramatically more of the heavier isotope to compensate for the disparity in decay rates.

     The palladium core of the device would most likely be Pd-107, which emits high-energy electrons as it decays into silver.  This is a pretty stable isotope that we would expect to be present in the normal (non-separated) palladium that Tony might salvage from a conventional weapon.

     Since we know the device uses charged particles travelling within a ring of electromagnets, we can summarize that a tiny amount of Pd-103 is ionized by an electric arc (thus the reactor's name, and start-up power requirement), which then allows Pd-103+ to be circulated at high velocity within the outer ring of the device.  The ionization acts to delay the electron capture step until the atom encounters a free electron, and the high kinetic energy due to velocity increases the chances of electron capture occuring once an electron is encountered.  In effect, the radioactive decay of Pd-103 can be started , stopped, and throttled by the device simply by controlling the ionization and circulation of the Pd-103.

     The device's geometry and electromagnetic fields routes the high-energy electrons from the Pd-107 core to the outer ring.  There the electrons are captured by high energy Pd-103 ions.  This electron capture process emits gamma rays, which are deflected inwards to catalyze the beta decay of the Pd-107 core.  We have some good evidence for this gamma ray emission, because the suit's chestpiece unibeam weapon is clearly an emission of a large number of high-energy photons directly from the arc reactor. Normally, the gamma rays are directed inward to catalyze the device's operation, but they can be directed outward in a concentrated energy beam weapon:    



     So to summarize: electrons project outward from the inner core, and gamma rays project inward from the outer ring. Because this electron/photon counterflow creates a deficit of electrons (relative to protons) in the core, a massive electrostatic potential is developed and the palladium core attracts lower-energy electrons from the suit's wiring. The ejection of electrons from the core towards the rim of the device produces an electrical cell capable of generating enormous voltage and current.

Here's the full proposed reactor start-up process:

  • Using external power, Pd-103 is ionized by an electric arc, and accelerated to high velocity in the outer ring. There may also be some externally-powered gamma ray production to jump-start the inner core.
  • Pd-107 in the inner core starts to emit high-energy electrons as it decays to Ag-107. The electrons escape the core and are directed by magnetic fields into the outer ring. Lack of electrons creates a net positive charge in the core, which slows further emission (preventing run-away decay) until the electrons can be externally replenished.
  • In the outer ring, the high-energy free electrons collide with high-energy Pd-103+ ions. This causes instantaneous electron capture and gamma ray emission. The gamma rays are deflected inward towards the core, thus catalyzing further electron emission and producing a self-sustaining reaction. Note that the reaction is self-sustaining, but very slow while the reactor is idle.
  • The electron flow from the inner core to the outer core creates an electric potential difference. When a circuit is created through the suit's electrical loads, the outer ring has an excess of electrons and the inner core has a shortage of electrons. This creates current.
  • The electrical current through an external load relieves the electrostatic charge accumulations that initially slowed the reactions. So the less power the suit draws, the slower the reactor produces radioactive decay, and the more power the suit draws, the faster the reactions are catalyzed. That way, the power output automatically throttles according to demand.
  • The palladium slowly converts to Rh-103 and Ag-107, and the reactor runs out of power when the palladium is fully consumed.
Miniature Arc Reactor Concept:




     We can't speak for the next-gen "new element" arc reactor, but presumably it replaces the palladium isotopes with a hypothetical element that also undergoes gamma-ray-mediated beta decay, but in a less-toxic and higher-output fashion.

Several other lines of evidence also support this type of nuclear decay / electron flux reaction being the mechanism for the arc reactor. First, the reactor's glow:

Iron Man Arc Reactor

     It could be caused by the ionization arc, but one can think Cherenkov radiation is a much better explanation. This is a special type of light emission that occurs when an energetic particle (such as electron) enters a medium (like water or air) at a speed faster than the speed of light in that medium. The high-energy electron flux within the arc reactor would be a natural fit to generate this effect. This is a picture of an actual nuclear reactor producing Cherenkov radiation:


      Notice the similarities? Unlike electrical arcs, the light from Cherenkov radiation is quiet, cool-blue, and fricken' awesome. This is a no-brainer -- the arc reactor's glow is definitely being produced by high-energy electron flux.

Another aspect of the original model palladium arc reactor was poisoning due to "palladium toxicity". It's very possible that palladium is simply being ejected from the device into Tony's blood by all the high-energy collisions going on, but this doesn't explain the freaky circuit-looking lines on his chest, and it doesn't explain why doctors can't help him.


      A theory that fits the symptoms better. Remember, the proposed palladium decay reactions produce rhodium and silver. Excess internal silver is known to stain skin blue:

     Rhodium compounds also stain skin, and are highly toxic. (Chemical properties, Health and Environmental effects) In fact, because most people have essentially zero exposure to rhodium, the toxicity of rhodium is very poorly-understood. This perfectly explains why Tony didn't seek help from the medical establishment for his accumulated heavy metal toxicity -- because he knew the doctors wouldn't know how to deal with rhodium poisoning. Tony Stark didn't have simple palladium poisoning, he had "palladium decay-product" poisoning!

So you see, everything fits together perfectly. The evidence all points towards the arc reactor relying on a Pd-103/Pd-107 radio-isotopic decay cell to produce electrical current.













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