An Electromagnet "Literally Blew the Doors Off" a Japanese Lab

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Hannes Power-User Join Date: Nov 2012 Posts: 431 Good Answers: 6	An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/27/2018 1:15 PM
	https://www.livescience.com/63664-magnet-physics-doors-tokyo.html Kudos to whoever snapped the image of the magnet actually exploding. __________________ Nobody realizes that some people expend tremendous energy merely to be normal. -Camus
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#11 "Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab" by Rixter on 09/27/2018 8:56 PM (score 4)
#16 "Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab" by redfred on 09/28/2018 10:45 AM (score 2)

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#7 "Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab" by Rixter on 09/27/2018 3:47 PM (score 1)

Doorman Guru Join Date: Apr 2009 Location: Yellowstone Valley, in Big Sky Country Posts: 7425 Good Answers: 295	#1 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/27/2018 1:18 PM
	Oh, my! __________________ Semper Ubi Sub Ubi
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#2 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/27/2018 1:44 PM
	..." A magnetar's 10¹⁰ tesla field, by contrast, has an energy density of 4.0×10²⁵ J/m³,"... Sounds like they're trying to make a Black Hole.... ..."To achieve that intensity, Takeyama and his team pump megajoules of energy into a small, precisely engineered electromagnetic coil, the inner lining of which then collapses on itself at Mach 15 — that's more than 3 miles per second (5 kilometers per second). As it collapses, the magnetic field inside gets squeezed into a tighter and tighter space, until its force peaks at a tesla reading unimaginable in conventional magnets. Fragments of a second later, the coil collapses entirely, destroying itself. "... Ah POOF.... __________________ All living things seek to control their own destiny....this is the purpose of life
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JPool Guru Join Date: Apr 2012 Location: Detroit MI, USA Posts: 2496 Good Answers: 271	#5 In reply to #2 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/27/2018 3:21 PM
	Black hole was exactly what I was thinking but you beat me to it. Maybe we could sell it to the Mars fella..... __________________ How we deal with death is at least as important as how we deal with life. --CAPTAIN KIRK, Star Trek II: The Wrath of Khan
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Brave Sir Robin Guru Join Date: May 2007 Location: Annapolis, Maryland Posts: 7940 Good Answers: 458	#8 In reply to #5 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/27/2018 5:04 PM
	I think he wanted some Illudium.
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Bayes The Engineer Join Date: Feb 2005 Location: Albany, New York Posts: 5060 Good Answers: 129	#6 In reply to #2 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/27/2018 3:44 PM
	A magnetar has got to be something to behold, right before it erases your hard drive (brain).
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70AARCuda Guru Join Date: Jan 2008 Location: Tucson, AZ Posts: 1331 Good Answers: 30	#3 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/27/2018 2:50 PM
	Now THAT's an MRI for "seeing" inside the densest of lead-heads (wink,wink)! __________________ ...and the Devil said: "...yes, but it's a DRY heat..!"
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Jpfalt Guru Join Date: May 2016 Posts: 1746 Good Answers: 87	#18 In reply to #3 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/28/2018 11:30 AM
	Well, someday, somewhere, someone was going to figure out a way to diagnose Democrats.
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MikeMack747 Power-User Join Date: Jan 2010 Location: Dayton Ohio Posts: 266 Good Answers: 10	#4 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/27/2018 3:00 PM
	No wonder my compass pointed due west for a minute __________________ MikeMack747
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Rixter

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Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab

09/27/2018 3:47 PM

This is the record for "Indoor Magnetic Fields", although if it blew the doors off???

Factor (tesla)	SI prefix	Value (SI units)	Value (CGS units)	Item
10 ⁻¹⁸	attotesla	5 aT	50 fG	SQUID magnetometers on Gravity Probe B gyroscopesmeasure fields at this level over several days of averaged measurements[2]
10 ⁻¹⁵	femtotesla	2 fT	20 pG	SQUID magnetometers on Gravity Probe B gyros measure fields at this level in about one second
10 ⁻¹²	picotesla	100 fT to 1 pT	1 nG to 10 nG	Human brain magnetic field
10 ⁻¹¹		10 pT	100 nG	In September 2006, NASA found "potholes" in the magnetic field in the heliosheath around our solar system that are 10 picoteslas as reported by Voyager 1 [3]
10 ⁻⁹	nanotesla	100 pT to 10 nT	1 μG to 100 μG	Magnetic field strength in the heliosphere
10 ⁻⁷		60 nT to 700 nT	600 μG to 7 mG	Magnetic field produced by a toaster, in use, at a distance of 30 cm (1 ft)[4]
10 ⁻⁷		100 nT to 500 nT	1 mG to 5 mG	Magnetic field produced by residential electric distribution lines (34.5 kV) at a distance of 30 cm (1 ft)[4][5]
10 ⁻⁶	microtesla	1.3 μT to 2.7 μT	13 mG to 27 mG	Magnetic field produced by high power (500 kV) transmission lines at a distance of 30 m (100 ft)[5]
10 ⁻⁶	microtesla	4 μT to 8 μT	40 mG to 80 mG	Magnetic field produced by a microwave oven, in use, at a distance of 30 cm (1 ft)[4]
10 ⁻⁵		24 μT	240 mG	Strength of magnetic tape near tape head
		31 μT	310 mG	Strength of Earth's magnetic field at 0° latitude (on the equator)
		58 μT	580 mG	Strength of Earth's magnetic field at 50° latitude
10 ⁻⁴		500 μT	5 G	The suggested exposure limit for cardiac pacemakersby American Conference of Governmental Industrial Hygienists (ACGIH)
10 ⁻³	millitesla	5 mT	50 G	The strength of a typical refrigerator magnet [6]
10 ⁻²	centitesla
10 ⁻¹	decitesla	150 mT	1.5 kG	The magnetic field strength of a sunspot
10 ⁰	tesla	1 T to 2.4 T	10 kG to 24 kG	Coil gap of a typical loudspeaker magnet.[7]
		1 T to 2 T	10 kG to 20 kG	Inside the core of a modern 50/60 Hz power transformer [8][9]
		1.25 T	12.5 kG	Strength of a modern neodymium–iron–boron (Nd2Fe14B) rare earth magnet. A coin-sized neodymium magnet can lift more than 9 kg, erase credit cards.[10]
		1.5 T to 7 T	15 kG to 30 kG	Strength of medical magnetic resonance imagingsystems in practice, experimentally up to 11.7 T[11][12][13]
		9.4 T	94 kG	Modern high resolution research magnetic resonance imaging system; field strength of a 400 MHz NMR spectrometer
10 ¹	decatesla	11.7 T	117 kG	Field strength of a 500 MHz NMR spectrometer
		16 T	160 kG	Strength used to levitate a frog[14]
		23.5 T	235 kG	Field strength of a 1 GHz NMR spectrometer [15]
		38 T	380 kG	Strongest continuous magnetic field produced by non-superconductive resistive magnet. [16]
		45 T	450 kG	Strongest continuous magnetic field yet produced in a laboratory ( Florida State University's National High Magnetic Field Laboratory in Tallahassee, USA).[17]
10 ²	hectotesla	100 T	1 MG	Strongest pulsed non-destructive magnetic field produced in a laboratory, Pulsed Field Facility at National High Magnetic Field Laboratory's, Los Alamos National Laboratory, Los Alamos, NM, USA).[18]
10 ³	kilotesla	1200 T	12 MG	Record for indoor pulsed magnetic field, ( University of Tokyo, 2018) [19]
10 ³	kilotesla	2800 T	28 MG	Record for human produced, pulsed magnetic field, ( VNIIEF, 2001)[20]
10 ⁶	megatesla	1 MT to 100 MT	10 GG to 1 TG	Strength of a neutron star
108 - 10 ¹¹	gigatesla	100 MT to 100 GT	1 TG to 1 PG	Strength of a magnetar
10 ⁵³	N/A	2×10 ²⁹ YT	2×10 ³³ YG	Planck magnetic field strength

https://en.wikipedia.org/wiki/Orders_of_magnitude_(magnetic_field)

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JE in Chicago Guru Join Date: Apr 2008 Location: Chicago Posts: 3990 Good Answers: 144	#9 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/27/2018 6:43 PM
	Why didn't it suck the doors in? __________________ High Tolerance is Beautiful
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jack of all trades Guru Join Date: Sep 2006 Location: Auckland, New Zealand Posts: 8777 Good Answers: 376	#10 In reply to #9 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/27/2018 7:41 PM
	The doors likely failed due to overpressure caused by the explosion. We have noted the same thing happen in a large test room where HV arc flash testing was conducted and someone did not securely latch the marine ship-style steel bulkhead door. The pressure generated by the arc flash test was enough to overcome the weight of the door and it flew open breaking an un-named engineer's arm who was standing on the other side. Quite scary just how much pressure an arc event can generate in an enclosed room. __________________ jack of all trades
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Rixter Guru Join Date: Apr 2010 Location: About 4000 miles from the center of the earth (+/-100 mi) Posts: 9912 Good Answers: 1141	#11 In reply to #9 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/27/2018 8:56 PM
	*Why didn't it suck the doors in?* The seed flux is compressed by the copper liner to obtain the high magnetic field intensity. My guess is that after the compressive force abates, the rebounding field exerts a lot of force on any conductors in the vicinity, causing the explosion. For anyone interested in more details, the technique used here is called Electromagnetic Flux Compression (EMFC). Basically, a large very strong magnetic field is generated (the Seed Field), and then a portion of this field is compressed into a much smaller volume, in this case with a very large current from a large capacitor bank discharged into a single loop coil. This forces a conductive copper liner to collapse, compressing the field. An alternate form of compression using explosives can generate even stronger fields, but this generally destroys the apparatus and must be done outside. The results are less controllable than EMFC. "The principal mechanism is simple; a thin metal cylinder, called the “liner,” undergoes high-speed implosion accelerated by the magnetic force induced by a huge electric current about its circumference, and a magnetic flux (a seed magnetic field) initially generated in a large volume (∼500 cm3) is eventually compressed into a megagauss magnetic field. Therefore, the magnet employed in the EMFC method is, in principle, composed of a single-turn primary outer coil, the liner (which is coaxially set inside the primary coil), and a pair of seed field coils set on either side of the primary coil.17–19 " FIG. 1.(a) Schematic view of the EMFC megagauss generator. (b) Cross section of (a). (c) Copper-lined primary coil and a pair of seed field coils. [Reproduced with permission from Nakamura et al., Rev. Sci. Instrum. 84, 044702 (2013). Copyright 2013 AIP Publishing LLC.] In (a), one of the initial seed field coils is presented in the displaced position, for more visible view of the primary coil. The primary coil is covered by an anti-explosive block made of bulk iron-steel, which is omitted in the drawing (a). https://aip.scitation.org/doi/full/10.1063/1.5044557
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redfred Guru Join Date: Dec 2008 Location: Long Island NY Posts: 15602 Good Answers: 982	#14 In reply to #9 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/28/2018 9:11 AM
	Compression time is brief. After that time interval, all of the vaporized solid conductors that were part of the arc flash now create an acoustic shock wave that opened the door. __________________ "Don't disturb my circles." translation of Archimedes last words
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JE in Chicago Guru Join Date: Apr 2008 Location: Chicago Posts: 3990 Good Answers: 144	#19 In reply to #14 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/28/2018 7:35 PM
	It almost seems like high explosives.... But without the high explosives.. Thanks for the explanation. __________________ High Tolerance is Beautiful
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JE in Chicago Guru Join Date: Apr 2008 Location: Chicago Posts: 3990 Good Answers: 144	#12 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/27/2018 9:49 PM
	I'm interested.. I just have trouble wrapping my head around the primary goal of an experiment that may last a few microseconds and destroys itself with so much energy that measuring anything becomes difficult due to the destruction of the tools of measurement?! "Outside researchers interested in elusive fusion-power generators have expressed interest in Takeyama's research as possibly useful for their large, magnetic plasma containment systems, he said. However, he said he's not certain how useful his fields might be in that context, nor is that his primary goal." I'd feel better investing in Mars gold. __________________ High Tolerance is Beautiful
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Epat07 Active Contributor Join Date: Sep 2018 Posts: 17 Good Answers: 1	#13 In reply to #12 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/27/2018 10:45 PM
	At 1200 Teslas maybe even Mars gold would be magnetic.. LOL.
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Rixter Guru Join Date: Apr 2010 Location: About 4000 miles from the center of the earth (+/-100 mi) Posts: 9912 Good Answers: 1141	#20 In reply to #12 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/29/2018 4:03 PM
	"...the primary goal of an experiment that may last a few microseconds..." My understanding is that in a magnetic field, a charged particle such as an electron is deflected at right angles to its motion, and so it travels in circles. The more energetic the electron, the larger the circles and the stronger the magnetic field, the smaller the circles. At the lowest possible energy for the electron, a field of 1000 teslas results in an orbit comparable to the distance between atoms. So it provides a means of learning more about material science. (And you get your name in the record book...) "A magnetic field of 1000 T corresponds to 0.8 nm cyclotron-orbit radius (magnetic length) of an electron; this is of the same order as a typical lattice constant. Therefore, in these extreme conditions the Broch electron model, which is based on the atomic periodic potential, does not hold anymore. Such ultra-high magnetic fields provide new opportunities for insights into material science and may allow us to develop a deeper understanding of novel physical concepts." https://aip.scitation.org/doi/full/10.1063/1.5044557
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Jose1 Commentator Join Date: May 2017 Posts: 70 Good Answers: 1	#15 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/28/2018 9:41 AM
	Does this fact can support a potential health concern if a technician stands inside of a stator core during a stator core test? Regards
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redfred Guru Join Date: Dec 2008 Location: Long Island NY Posts: 15602 Good Answers: 982	#16 In reply to #15 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/28/2018 10:45 AM
	The power released in this pulsed power experiment is orders of magnitude greater than what can be contained in any form of iron core stator. So the safety concerns of this experiment should not persuade anyone of the safe or hazardous conditions of a stator core test. __________________ "Don't disturb my circles." translation of Archimedes last words
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Jose1 Commentator Join Date: May 2017 Posts: 70 Good Answers: 1	#17 In reply to #16 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/28/2018 10:51 AM
	I have stand inside of HV stator during core test to mark hot spots; therefore my question. Note: There are medical equipment operating about 7T.
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SWB123 Power-User Join Date: Jun 2011 Posts: 336 Good Answers: 18	#21 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 09/30/2018 10:58 PM
	From what do you manufacture a coil which will take that much power and doesn't just burn out before it collapses? __________________ If at first you don't succeed, skydiving is not for you!
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redfred Guru Join Date: Dec 2008 Location: Long Island NY Posts: 15602 Good Answers: 982	#22 In reply to #21 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 10/01/2018 9:01 AM
	I have no idea and neither do these experimenters. Not only do these coils get vaporized but they control the vaporization process to increase the field produced. __________________ "Don't disturb my circles." translation of Archimedes last words
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phoenix911 Guru Join Date: Aug 2007 Posts: 23647 Good Answers: 420	#23 Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab 05/21/2025 10:21 PM
	An MRI can be quite life threatening also…. __________________ “ When people get what they want, they are often surprised when they get what they deserve " - James Wood
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#11 "Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab" by Rixter on 09/27/2018 8:56 PM (score 4)
#16 "Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab" by redfred on 09/28/2018 10:45 AM (score 2)

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#7 "Re: An Electromagnet "Literally Blew the Doors Off" a Japanese Lab" by Rixter on 09/27/2018 3:47 PM (score 1)

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An Electromagnet "Literally Blew the Doors Off" a Japanese Lab

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