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Tokyo researchers created the strongest controllable magnetic field in history
- camtarn 8y agoAnti-clickbait: they didn't blow up their lab, just blew the doors off an iron enclosure intended to contain the massive shockwave, which turned out to be even more massive than intended. Still impressive though!
- SketchySeaBeast 8y ago> just blew the doors off an iron enclosure intended to contain the massive magnetic field Now, I'm by no means a physicists, but aren't iron enclosures particularly bad at containing magnetic fields?
- bitexploder 8y agoIt had a lot of holes, maybe that has something to do with it. Looked like a giant microwave door screen.
- cuboidGoat 8y agoThe magnetic field will tend to concentrate in the iron, meaning it shouldn't propagate as far. Same as using Mu metal for magnetic shielding - https://en.wikipedia.org/wiki/Mu-metal https://en.wikipedia.org/wiki/Mu-metal
- SketchySeaBeast 8y agoIt shouldn't propagate, but the whole thing should be magnetized at that point, right? While you've got that electro magnet on you could probably stick fridge to the big iron magnet you've created with the container?
- cuboidGoat 8y agoDepends on how the field moves relative to the iron. If it expands then contracts, which seems highly likely, the overall effect on magnetizing the iron could be surprisingly low, as far as I am aware. Though I could be wrong on this. edit - ahh, reading through you mean during the experiment, rather than it being left magnetized afterward. During the test it should focus field lines within it. The overall strength of the field will remain the same, but field lines will be concentrated on the cage, meaning it does not propagate as far. Though there should be people on here that will be able to explain this better than I can. And correct me if I am talking rubbish. I am solidly an amateur on this, and there are definitely some professionals floating about.
- empath75 8y agothe iron enclosure was meant to contain the explosion not the field.
- camtarn 8y agoGood point - edited!
- CompelTechnic 8y agoFrom a tiny bit of experience, I know that industrial electromagnets (think of the ones they use to pick up steel at a scrap yard) often have an iron/steel housing that is used as a "return path" for the field. The front face of the magnet has a field that projects out into the air, but the field on the back face gets channeled into the housing.
- kazinator 8y agoAlnico horseshoe magnets are often sold with a keeper bar: https://en.wikipedia.org/wiki/Magnet_keeper https://en.wikipedia.org/wiki/Magnet_keeper
- contravariant 8y agoWell you're going to need something that reacts to magnetic fields in some way. In that sense iron isn't an odd choice. Anything that isn't susceptible to magnetic fields is not going to do much, even if its conductive that can only help against brief bursts.
- bennyelv 8y agoI was waiting for Gordon Freeman to emerge from behind the machine with his crowbar...
- bhousel 8y agoI'm kind of amazed they were even able to record a video in a 1200 Tesla magnetic field.
- d-sc 8y agoMagnetic fields tend to decay with distance from the source which helps.
- etiam 8y agoAnd broadly speaking by the cube of the distance from the source apparently. But in this case it decays from a mind-boggling starting level by everyday life standards. If that camera is 5 meters away from the source the field there is still about 10 Tesla. I think that's about an order of magnitude more than most MRI machines for clinical purposes, and those already warrant a good deal of care with effects on metals.
- lostlogin 8y agoMRI vendors require some parts be photographed at service. Standard tool for this is a phone camera. I don’t know if this applies above 3T but at that level it’s all fine. And as for clinical field strengths - there are 7T scanners being marketed, but they are rare.
- etiam 8y agoI personally don't work with machines like that, and never have, but I imagine most service would be out of the question without bringing down the magnetic field? If the magnet is not active, certainly consumer electronics could be used even near it. If the magnet is active at anything close to it's operation level, I'm seriously skeptical that a cell phone would fare okay close to it. Have you tried for yourself? Are you sure that the photos you've been in touch with were not rather taken at about 0T ?
- lostlogin 8y ago
- cuboidGoat 8y agoVice really needs to hire some proofreaders.
- justtopost 8y agoI hate when I see a sciency article from them. They are great with human interest stuff (if you like their spin) but the technical stuff is always lacking. You can tell where the writer hits their wall of undertanding and tries to fill it with quotes instead of working with someone knowlegable on the subject.
- nerdnumerouno 8y agoThey are a trash rag, not a surprise.
- jandrese 8y agoIt blows my mind that we can compress a magnetic field with chemical explosives. I wouldn't have expected them to interact much at all.
- phkahler 8y ago>> I wouldn't have expected them to interact much at all. They don't interact directly: https://en.wikipedia.org/wiki/Explosively_pumped_flux_compression_generator https://en.wikipedia.org/wiki/Explosively_pumped_flux_compre...
- piyh 8y agoThis is the link I was looking for in the comments, thanks.
- mrhackerpoland 8y agoNow my question is, can it damage SSD? Or interfere with my wifi? Is it strong enough to alter my brain?
- forgot-my-pw 8y agoSome examples of Tesla unit: https://en.wikipedia.org/wiki/Tesla_(unit)#Examples https://en.wikipedia.org/wiki/Tesla_(unit)#Examples & https://en.wikipedia.org/wiki/Orders_of_magnitude_(magnetic_field) https://en.wikipedia.org/wiki/Orders_of_magnitude_(magnetic_... 8 T – the strength of LHC magnets 11.75 T – the strength of INUMAC magnets, largest MRI scanner 16 T – magnetic field strength required to levitate a frog 17.6 T – strongest field trapped in a superconductor in a lab as of July 2014 35.4 T – the current (2009) world record for a superconducting electromagnet in a background magnetic field 45 T – the current (2015) world record for continuous field magnets 100 T - Strongest pulsed non-destructive magnetic field produced in a laboratory 1200 T - Record for indoor pulsed magnetic field, (University of Tokyo, 2018) 2800 T - Record for human produced, pulsed magnetic field, (VNIIEF, 2001) 1 MT - 100 MT - Strength of a neutron star
- ChuckMcM 8y agoWow, 2800T is .28% of a neutron star? That is pretty impressive.
- tomkat0789 8y agoCould you put a machine (that wasn't powered by TNT or something equally crazy) into a space ship for protection from cosmic rays? Is that something people are looking into?
- scrumbledober 8y agoI don't have a source on hand but I have read some study that theorized a very powerful electromagnet in a mars-sun lagrange point could be used to create a magnetic field to shield mars from cosmic radiation in a similar way to earth's magnetosphere. I seem to remember the power needed being (obviously) very large but surprisingly not many orders of magnitude out of plausibility. For a much smaller entity than a planet (spaceship) it may be possible with a low enough power consumption to make it possible. I would imagine there would be many many engineering concerns with having such a high powered magnet in your spaceship though.
- rhcom2 8y agoReminds me of the scene at the end of Real Genius when they get their laser chemical laser to finally work and it puts a hole through the building.
- calebm 8y agoI think the most likely doomsday scenario involves this type of weapon.