Yes, stars are fusion reactors.
No. Our reactors are fission reactors. We haven't yet mastered fusion reactors for power.
Fusion reactors produce less radioactive waste compared to fission reactors. Fusion reactors use abundant sources such as deuterium and lithium for fuel, while fission reactors use limited sources like uranium. Fusion reactions release more energy per unit mass of fuel compared to fission reactions.
Well, fusion bombs are, but fusion reactors should not be (if we can build them).
Currently, fusion reactors are still in the experimental stage and do not produce electricity for the grid. The output power of experimental fusion reactors ranges from a few megawatts to tens of megawatts, depending on the design and scale of the reactor. Commercial fusion reactors, when developed, are expected to generate hundreds of megawatts to gigawatts of power.
Fusion reactors have not been built yet because it is challenging to create and sustain the extreme conditions required for nuclear fusion to occur, such as high temperatures and pressures. Scientists are still working on developing the technology to make fusion reactors a viable and practical energy source.
There are fission and fusion reactors. However, at present (2016) there is no commercial fusion reactor which can produce more energy than is required to operate it.
There are fuel pellets and laser beams inside fusion reactors. But note that we have not build a successful one. The technical problems are overwhelming at this point.
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The development of nuclear fusion reactors is desirable because they offer a potentially limitless and clean energy source with minimal greenhouse gas emissions. Fusion reactors use isotopes of hydrogen as fuel and produce no long-lived radioactive waste, offering a safer alternative to current nuclear fission reactors. Additionally, fusion fuel sources are abundant and widely available, making fusion a promising solution for meeting global energy demands sustainably.
All current nuclear reactors are fission reactors, tritium has no function in a fission reactor, in standard water moderated reactors deuterium also has no function, in heavy water moderated reactors deuterium is the moderator. If we are ever able to make a fusion reactor, deuterium/tritium mix will be used as fuel.
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Terry Kammash has written: 'Fusion reactor physics' -- subject(s): Fusion reactors