About Nuclear Fusion
Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles. The difference in mass between the reactants and products is manifested as either the release or absorption of energy.
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What is nuclear fusion and how does it work?
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What is nuclear fusion and how does it work?
By Esme StallardBBC News Climate and Science
US scientists have reached a major milestone in their attempts to perfect a process which could potentially deliver almost limitless supplies of energy.
Nuclear Fusion does not rely on fossil fuels or produce harmful greenhouse gases, so could also help tackle Climate Change .
What is Nuclear Fusion ?Nuclear Fusion is The Process which gives The Sun its energy.
Scientists from More Than 50 countries have been trying to recreate it on Earth since the 1960s.
They hope it could eventually provide huge quantities of Clean Energy for The World .
In Nuclear Fusion , pairs of tiny particles called atoms are heated and forced together to make one heavier one.
It is The Opposite of Nuclear Fission , in which heavy atoms are split apart. Nuclear Power stations currently use Nuclear Fission to generate electricity.
Why is Nuclear Fusion so important?Nuclear Fission produces a lot of radioactive waste, which can be dangerous and must be stored safely - potentially for hundreds of years.
The waste produced by Nuclear Fusion is less radioactive and decays much More quickly.
Nuclear Fusion doesn't need fossil fuels Like oil or gas. It also doesn't generate greenhouse gases,
Most fusion experiments use hydrogen, which can be extracted cheaply from seawater and lithium, meaning.
It has been described as the " holy grail" of energy production.
How does Nuclear Fusion work?When two atoms of a light element such as hydrogen are heated and combine to form a single heavier element such as helium, the Chemical Reaction produces massive amounts of energy which can be captured.
But getting two identical elements to combine is actually very hard.
Because They have the same charge - Like the positive ends of two batteries - They naturally repel each other.
A lot of energy is needed to overcome this resistance.
In The Sun , this happen thanks to extremely high temperatures of around ten million degrees Celsius, and significant pressure - More Than 100 billion times That of The Earth 's atmosphere.
On Earth, scientists have used various different techniques to attempt to recreate these conditions.
But it has proved very difficult to maintain The High temperature and pressure needed for long enough.
The US's National Ignition Facility (NIF) has announced.
This means That - for the First Time - scientists were able to generate More power than the lasers put in to The Experiment .
When will large-scale Nuclear Fusion be possible?Despite a series of promising breakthroughs in The Last few years, large-scale Nuclear Fusion is still several years away.
In February, European scientists at the UK-based JET laboratory.
But even the successful NIF experiment in the US did not produce More energy than was needed to needed to make the lasers work in the First Place - and the research programme to get to this point has cost billions of dollars.
Although physicists have welcomed the US Results - and described them as a true breakthrough moment - They point out That much More work is needed before Nuclear Fusion could be used to power homes or businesses.
Scientists will now Focus On reproducing fusion More quickly and cheaply.
How safe is Nuclear Fusion ?The International Atomic Energy Agency (IAEA) " intrinsically safe. "
The conditions required to start and maintain a fusion reaction are so extreme That it is impossible for it to run out of control.
" Fusion is a self-limiting process: if you cannot control the reaction, the machine switches itself off, " explained the IAEA's Sehila González de Vicente.
The Lower Level of radiative waste produced by The Process compared to Nuclear Fission is also much easier to handle and store.
Could Nuclear Fusion help tackle Global Warming ?Nuclear Fusion does not rely on fossil fuels Like oil or gas, and produces none of The Greenhouse gases which drive Global Warming .
Unlike solar or wind energy it is not dependent on beneficial weather conditions.
It uses two relatively abundant materials found on Earth: lithium and hydrogen.
Widescale use of Nuclear Fusion could help countries.
However, it will be many years before recent experimental successes can be meaningfully scaled up.
Source of news: bbc.com
