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If we could extend the radius of the design from a central point, a bit like an inflating sphere, at some point I am sure the plasma could not affect and ''buckle'' the design, because the ''energy'' at a greater radius would be weak if the energy was contained centrally by a magnetic field.
Quote from: TheBoxIf we could extend the radius of the design from a central point, a bit like an inflating sphere, at some point I am sure the plasma could not affect and ''buckle'' the design, because the ''energy'' at a greater radius would be weak if the energy was contained centrally by a magnetic field.As you say, confinement of a fusion plasma is an insidious problem - every time one problem is overcome, the sneaky plasma finds another way to break out. Nevertheless, the experts assure us that they have made considerable progress (even though it may not seem so to outsiders).Increasing the volume of the plasma is certainly a good approach - you increase the mass of plasma by the cube of the size, but only increase the area through which the heat can escape by the square of the size. Maintaining a carefully structured, powerful magnetic field through an increased volume is also a challenge. Part of the solution is to measure the stability of the plasma at frequent intervals, and increase the strength of the magnetic field where the plasma is starting to break through to reinforce it at that point. Unfortunately, I fear that the cost will increase by more than the cube of the size; they already have enough problems transporting the magnet pieces to the construction site for ITER.You can find out a lot about Nuclear fusion from this podcast:http://omegataupodcast.net/22-nuclear-fusion-at-mpi-fur-plasmaphysik/http://omegataupodcast.net/157-fusion-at-iter/
Quote from: evan_au on 14/08/2016 08:53:50Quote from: TheBoxIf we could extend the radius of the design from a central point, a bit like an inflating sphere, at some point I am sure the plasma could not affect and ''buckle'' the design, because the ''energy'' at a greater radius would be weak if the energy was contained centrally by a magnetic field.As you say, confinement of a fusion plasma is an insidious problem - every time one problem is overcome, the sneaky plasma finds another way to break out. Nevertheless, the experts assure us that they have made considerable progress (even though it may not seem so to outsiders).Increasing the volume of the plasma is certainly a good approach - you increase the mass of plasma by the cube of the size, but only increase the area through which the heat can escape by the square of the size. Maintaining a carefully structured, powerful magnetic field through an increased volume is also a challenge. Part of the solution is to measure the stability of the plasma at frequent intervals, and increase the strength of the magnetic field where the plasma is starting to break through to reinforce it at that point. Unfortunately, I fear that the cost will increase by more than the cube of the size; they already have enough problems transporting the magnet pieces to the construction site for ITER.You can find out a lot about Nuclear fusion from this podcast:http://omegataupodcast.net/22-nuclear-fusion-at-mpi-fur-plasmaphysik/http://omegataupodcast.net/157-fusion-at-iter/Thank you , I am not sure I understood that fully and I will view the links provided. My understanding is that the Plasma gains mass and ''grows'', so as it ''grows'' the magnetic field strength needs to be continually increased?What part do likewise charges play in the plasma if any?And is it kE that is the ''food'' for growth or other?
An electrical ARC is stated as being 35,000 degrees, this is certainly hot enough to create fusion with a radio active catalyst present.
I would think a spherical containment would be preferred.
Quote from: William McCAn electrical ARC is stated as being 35,000 degrees, this is certainly hot enough to create fusion with a radio active catalyst present. Heavy metal ions (eg Thorium or Tungsten) attract electrons strongly, and have many energy levels, which result in radiating energy much more efficiently than a fully-ionized Hydrogen plasma. These heavy ions "poison" the plasma. Fusion designers go to great lengths to avoid any contamination of the plasma by partially-ionized atoms, and to promptly remove any heavy ions from the plasma (eg atoms evaporated from the walls).On what basis do you claim that fusion occurs with a radioactive catalyst?- The temperature needs to be hot enough for momentum to overcome the considerable electrical repulsion of Hydrogen nuclei (usually a mixture of Tritium and Deuterium). This temperature is in the millions of degrees, not thousands.- Thorium decays by emitting an alpha particle (Helium nucleus), but this is an example of Fission, not Fusion. The half-life is billions of years, so effectively none of it will decay in the lifetime of an electrical arc.- Tritium is also radioactive; with a lifetime of a dozen years, a much greater fraction will decay in the lifetime of a fusion experiment. But this isn't enough to catalyze controlled fusion (at least, not yet).QuoteI would think a spherical containment would be preferred.A sphere is certainly the shape that has proved most effective at generating fusion energy so far; the Sun is a sphere, using gravitational confinement.But seriously, it is a promising shape, because it has the minimal surface area (losing heat) for the volume (generating heat). A spherical fusion reactor has certainly been tried.However, it is very hard to generate a spherical magnetic field, since magnetic fields always need a North and a South - and these are points where the plasma can escape (and potentially melt the magnet poles).The most common approach to defeat plasma leakage at the magnetic poles is to use a toroidal reactor, with plasma shaped like a donut. In this case, it is possible to connect the magnetic field in a closed circle, so there is no North or South pole for the plasma to escape (but it always seems to find some other way to escape [] ). See: https://en.wikipedia.org/wiki/Fusion_power#Magnetic_confinement
You can make a spherical field with no poles to produce a mono-field by ''aiming'' either + or - of a bar magnet inwards to make a sphere of magnets with one polarity pointing inwards and one polarity pointing outwards.
Quote from: evan_au on 15/08/2016 11:22:37Quote from: William McCAn electrical ARC is stated as being 35,000 degrees, this is certainly hot enough to create fusion with a radio active catalyst present. Heavy metal ions (eg Thorium or Tungsten) attract electrons strongly, and have many energy levels, which result in radiating energy much more efficiently than a fully-ionized Hydrogen plasma. These heavy ions "poison" the plasma. Fusion designers go to great lengths to avoid any contamination of the plasma by partially-ionized atoms, and to promptly remove any heavy ions from the plasma (eg atoms evaporated from the walls).On what basis do you claim that fusion occurs with a radioactive catalyst?- The temperature needs to be hot enough for momentum to overcome the considerable electrical repulsion of Hydrogen nuclei (usually a mixture of Tritium and Deuterium). This temperature is in the millions of degrees, not thousands.- Thorium decays by emitting an alpha particle (Helium nucleus), but this is an example of Fission, not Fusion. The half-life is billions of years, so effectively none of it will decay in the lifetime of an electrical arc.- Tritium is also radioactive; with a lifetime of a dozen years, a much greater fraction will decay in the lifetime of a fusion experiment. But this isn't enough to catalyze controlled fusion (at least, not yet).QuoteI would think a spherical containment would be preferred.A sphere is certainly the shape that has proved most effective at generating fusion energy so far; the Sun is a sphere, using gravitational confinement.But seriously, it is a promising shape, because it has the minimal surface area (losing heat) for the volume (generating heat). A spherical fusion reactor has certainly been tried.However, it is very hard to generate a spherical magnetic field, since magnetic fields always need a North and a South - and these are points where the plasma can escape (and potentially melt the magnet poles).The most common approach to defeat plasma leakage at the magnetic poles is to use a toroidal reactor, with plasma shaped like a donut. In this case, it is possible to connect the magnetic field in a closed circle, so there is no North or South pole for the plasma to escape (but it always seems to find some other way to escape [] ). See: https://en.wikipedia.org/wiki/Fusion_power#Magnetic_confinementWhy don't we rotate the magnetic field so the magnetic poles are constantly moving about ?Plasma is clearly dynamic so surely a ''stationary'' magnetic field will always fail and a field to hold a dynamic must be surely a dynamic field?''Stationary'' fields surely have a threshold? added- You can make a spherical field with no poles to produce a mono-field by ''aiming'' either + or - of a bar magnet inwards to make a sphere of magnets with one polarity pointing inwards and one polarity pointing outwards.
the most damning evidence that ammonia is not NH3 is that the gas companies do not use those 3 luscious hydrogen atoms to make hydrocarbons, but rather go after the two hydrogen atoms contained in water.
My experiments with ammonia show it to be an oxidizer. From accidents, fuel air explosions involving ammonia I would concur with others that now feel it contains oxygen.
Fussion fission takes place everyday in industry.
Quote from: William McC the most damning evidence that ammonia is not NH3 is that the gas companies do not use those 3 luscious hydrogen atoms to make hydrocarbons, but rather go after the two hydrogen atoms contained in water. It is true that many attempts to produce hydrogen gas (eg to fuel hydrogen cars) starts with water as the hydrogen source.- That is because the Earth is 70% covered with the stuff - it even falls from the sky.- If you were on Jupiter, you might decide to start with Ammonia (except Jupiter already has plenty of Hydrogen...)- On Earth, Ammonia is far more valuable as a feedstock for agricultural fertilizer and chemical processes than it is to fuel a small number of hydrogen vehicles.- And we tend to pump or dig hydrocarbons out of the ground. You can't produce them from water or Ammonia (which have no carbon)- The very inert nature of Nitrogen (N2) is due to the triple bonds between the two Nitrogen atoms which must be broken to attach other atoms. If you can break the triple bond, you can attach a Hydrogen to each of them, producing NH3 (Ammonia). - Worldwide, humans spend a largish percentage of our energy costs/carbon dioxide emissions on capturing nitrogen from the air (while legumes like beans do it for free).For a picture of Ammonia (NH3), see: https://en.wikipedia.org/wiki/AmmoniaFor a picture of Nitrous Oxide (NO2), see: https://en.wikipedia.org/wiki/Nitrous_oxide- NO2 has been used as an oxidiser in rocket motors, and laughing gas in dentistry...- I can see why they might not want tanks of the stuff hanging around in schools!QuoteMy experiments with ammonia show it to be an oxidizer. From accidents, fuel air explosions involving ammonia I would concur with others that now feel it contains oxygen.If I remember my chemistry classes, the definition of an oxidiser is a chemical that likes to steal electrons from other chemicals. Oxygen is the most familiar example of it (we breathe it every few seconds), and oxygen lends its name to this group of chemicals.But other chemicals can also act as oxidisers without actually containing any oxygen. Some chemicals like fluorine are even more active oxidisers than oxygen.See: https://en.wikipedia.org/wiki/Oxidizing_agentQuoteFussion fission takes place everyday in industry. Electrical fuses use fusion every day. One meaning of "Fusion" is melting, which does not change the nature of atomic nuclei (and may not even result in chemical changes beyond much faster oxidation).But this thread is about Nuclear Fusion, where Hydrogen nuclei are fused into Helium to yield the most energy (sometimes more circuitous routes via intermediates like Lithium & Beryllium are proposed, which have their own problems).Please provide some examples of everyday industrial processes which use Nuclear Fusion.
They can and do strip the hydrogen off of the oxygen in water using carbon heated to incandescence, in a chamber void of most oxygen. To create free hydrogen that they then combine to create most of the hydrocarbon products we use. If ammonia were NH3 they would use every drop of it to create the hydrocarbons we use regularly.
Nitrogen does not bond with hydrogen for one, that was basic chemistry where I come from. As I mentioned nitrogen snuffs out fires, it is an anti oxidant. It is not an oxidizer. That means if there is any oxidizing going on from the presence of ammonia we are claiming that hydrogen is the oxidizer. There is serious basic error in the chemical formula NH3. There is no such chemical.
But there are many books that state there is such a chemical as NH3. There are many books that claim a lot of things today. In many older chemical books they refused to put a chemical formula for ammonia in the chemical books, while every other chemical in the books had a formula. It was because, it was not NH3 like a few pre World War Two German chemists claimed it was. Whether they did that for a joke or a facetious prank to belittle poor American chemistry, it eventually stuck.
Propane and ammonia gas can create a silent explosion that can hurl humans at the speed of a bullet. Positively accelerating them in a few feet to the velocity of a bullet. Hazmat personnel have been seriously injured by this type of fuel air explosive. Farm animals as well have been hurled great distances by this type of silent explosion. This was part of my training as a HAZMAT professional. It came complete with a video of a man being hurled through a cinder block wall during the making of a training video to train people how to safely handle an anhydrous ammonia spill. That may seem comical until you see the video. I was already aware of this danger because it was standard training when you were young in my area. Many refrigeration systems still used ammonia as the refrigerant and this was a potential accident. It also occurred on farms when urine from animals on hot stagnant days accumulated and mixed with methane from the animals rotting feces.
Explosive decompression of liquified ammonia or liquefied propane is not proof of any type of chemical reaction. Frankly I am terrified that someone as ill-informed as you can be a "trained HAZMAT professional"
Nitrogen gas (N2) is fairly unreactive, and can be used to put out some fires, but do not confuse this with being non-oxidizing. Reactive metals like lithium, sodium, potassium, and magnesium will all burn violently in pure N2 atmosphere, producing the metal nitride (e.g. Mg3N2). Hydrogen also reacts with nitrogen to produce ammonia (exothermically), but the process requires a catalyst and high temperatures and pressures to work effectively (Haber-Bosch process)
Quote from: chiralSPO on 29/08/2016 05:45:31Explosive decompression of liquified ammonia or liquefied propane is not proof of any type of chemical reaction. Frankly I am terrified that someone as ill-informed as you can be a "trained HAZMAT professional"You are injecting conjecture. Who stated explosive decompression of a liquified ammonia or liquefied propane? Certainly not me. I stated that anhydrous ammonia and propane in air can create a silent explosion. A fuel air explosive. Now I can understand you have no data or experience with such a thing. But you can do the experiment if you like. Just create a chamber with anhydrous ammonia at the bottom of the chamber like a spill, reagent grade anhydrous ammonia still has water in it, then add just a tiny bit of propane into the chamber, and ignite it. Do not be anywhere near this experiment. The chamber can be almost at atmospheric pressure it can have a large vent to the atmosphere. Things like kiln dust, ash, and uncoated cement can turn anhydrous reagent grade ammonia, and even store bought ammonia hydroxide into powerful asphyxiating ammonia gas. If you find your ammonia is not strong enough. Sincerely, William McCormick
Quote from: William McC on 29/08/2016 06:15:35Quote from: chiralSPO on 29/08/2016 05:45:31Explosive decompression of liquified ammonia or liquefied propane is not proof of any type of chemical reaction. Frankly I am terrified that someone as ill-informed as you can be a "trained HAZMAT professional"You are injecting conjecture. Who stated explosive decompression of a liquified ammonia or liquefied propane? Certainly not me. I stated that anhydrous ammonia and propane in air can create a silent explosion. A fuel air explosive. Now I can understand you have no data or experience with such a thing. But you can do the experiment if you like. Just create a chamber with anhydrous ammonia at the bottom of the chamber like a spill, reagent grade anhydrous ammonia still has water in it, then add just a tiny bit of propane into the chamber, and ignite it. Do not be anywhere near this experiment. The chamber can be almost at atmospheric pressure it can have a large vent to the atmosphere. Things like kiln dust, ash, and uncoated cement can turn anhydrous reagent grade ammonia, and even store bought ammonia hydroxide into powerful asphyxiating ammonia gas. If you find your ammonia is not strong enough. Sincerely, William McCormickSorry, I guess I misread your initial statement. Of course ammonia or propane can form an explosive fuel air mixture in air. Isn't this is an argument in favor of ammonia being more similar to hydrocarbon? (they both burn in air)Regarding the reaction of sodium and nitrogen: Lithium and magnesium burn violently in nitrogen. Sodium will react, but not quite as completely--this is a reversible reaction, and an equilibrium mixture is attained depending on the temperature.Perhaps you can offer some evidence as to why ammonia couldn't be NH3?