John Arthorne

@jarthorne

Profoundly unable to summarize my existence in the space afforded to a twitter bio

Vrijeme pridruživanja: srpanj 2012.

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  1. 4. velj

    I gave a guest lecture to a University Computer Eng class today, which I've been doing for years. As usual there were about 2 women in a room of >100. It's sad to realize how much talent we are missing out on, and it's not improving. We all need to do more to help solve this!

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  2. 4. sij

    This was an experiment to share my study notes here, and a surprising amount of work to distill this topic down into a few threads. I hope at least some people found this useful. Now it's time to get back to the only slightly less complex world of software development 😉

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  3. 4. sij

    Advanced book: Nuclear Fusion by Edward Morse. If you really want to get into detail on the math and physics. Frankly over my head with only undergrad physics background, but there are useful high level summaries too.

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  4. 4. sij

    Wikipedia has a lot of pages on Fusion. It is useful to lookup specific details, but not a good main source because fringe ideas are lumped together with mainstream ideas and it is hard to form useful conclusions.

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  5. 4. sij

    Most useful book: The Future of Fusion Energy by Jason Parisi and . Detailed argument on why fusion is worth pursuing, approachable physics explanation, historical survey, and some advanced topics.

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  6. 4. sij

    If you only have a few hours to learn about fusion energy, I highly recommend the excellent which has several episodes on fusion. I suggest catching episodes in the following order: 304, 22, 157, 312, 285.

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  7. 4. sij

    Fusion energy is a field worth following, and I'm excited to see where it goes. I have no expertise here so please study it yourself and come to your own conclusions. Here are a few resources I found valuable:

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  8. 4. sij

    At the same time it restores faith in humanity to see so many brilliant people pursuing a critical long term goal. At the height of the cold war Soviets and US military were sharing knowledge on fusion, and modern projects like ITER are a success story in int'l cooperation.

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  9. 4. sij

    Fusion energy is full of both promise and frustration. The long term potential is so large it is worth pursuing, but it won't help in the short term. It is more urgent to pursue energy storage, renewables, and fission power to lower carbon now.

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  10. 4. sij

    Thread 7/7 from a week studying : Conclusion and Resources.⬇️

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  11. 4. sij

    Fissile fuels are easy to detect, and since there is no reason for them in a fusion plant it would be easy to monitor for. A long term future that uses a mix of fusion and renewables would allow for phase out of the tech and infrastructure needed to create nuclear weapons.

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  12. 4. sij

    The fuels used in a fusion reactor are not sufficient to produce nuclear weapons. Fusion reactors do produce free neutrons, which could be used to enrich uranium for use in nuclear weapons. However there are much simpler enrichment methods.

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  13. 4. sij

    Replacing traditional power with fission reactors would put this infra in more countries and forever come with the risk of nuclear weapon proliferation. Now let's look at fusion. Some nuclear weapons use fusion to magnify their power, but still require fission to trigger fusion.

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  14. 4. sij

    The infrastructure required to support fission power (uranium processing and enrichment) can easily be re-purposed to produce nuclear weapons. Weapon-grade plutonium is mainly produced in nuclear fission reactors.

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  15. 4. sij

    When looking at long term energy sources, it should be compatible with a world free of nuclear weapons. This is a major drawback of fission power, which requires similar fuels (but less refined) to those used by nuclear weapons.

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  16. 4. sij

    Thread 6/7 of my week studying fusion energy: Nuclear energy and nuclear proliferation 👇

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  17. 3. sij

    The result of a fusion reactor failure would be expensive to repair but have very low risk to human life. For more details see . Another important safety topic is nuclear proliferation, which I will cover in another thread tomorrow.

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  18. 3. sij

    While confined, an ignited plasma is safe. Fusion can only continue while the plasma remains confined. A plasma that breaks confinement will rapidly cool and stop reacting. This would damage the reactor containment vessel, and result in nearby metals becoming mildly radioactive.

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  19. 3. sij

    Fission reactions are hard to stop while fuel remains available, which means removal of negative feedback or lost cooling can result in a runaway reaction. Fusion does not have this risk. An ignited plasma (Q=∞) sounds like a runaway chain reaction, but it is not.

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  20. 3. sij

    If you lookup deaths per terawatt-hour by energy source, you will see fission is far safer than most conventional power sources, including hydro (compare Chernobyl to Banqiao Dam disaster, for example). The three major fission failures are well understood.

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