FSU Sets 7 World Records In High Magnetics Research 178
spence calder writes "FSU's High Magnetic Field Lab, more specifically my Kenpo teacher, just broke 7 world records, and brought the record for a superconducting magnet to 25 Tesla. Check it out at FSView and a more detailed article here. Now if only our football team was that cool." And if you'd like your magnetic toys to shoot metal bits,
Jason Rollette points to his
railgun project, which looks like good, clean, high-voltage fun.
/. = Server Railgun (Score:3, Funny)
Re:/. = Server Railgun (Score:2)
HTTP error 504
504 No response from server
Error connecting to '68.185.174.190'.
bummer.
Re:/. = Server Railgun (Score:2)
Re:/. = Server Railgun (Score:1)
Re:/. = Server Railgun (Score:1)
25 Tesla? (Score:5, Funny)
FP
Re:25 Tesla? (Score:2)
Re:25 Tesla? (Score:1)
Could you explain it for us poor ingorant saps?
- Peter
Re:25 Tesla? (Score:1)
The americans had normal weapons, the russians had cool stuff like tesla coils and mind control weapons. tesla coils were the best defensive weapon in the game
Re:25 Tesla? (Score:2)
Canadian and Coke?
"...good, clean, high-voltage fun." (Score:5, Funny)
Re:"...good, clean, high-voltage fun." (Score:1)
Re:Show me. (Score:1)
Please just buy a license to protect your ability to further discuss Dr. Nobel. and his "weapon to end all war".
All mention of diatomaceous earth and nitroglycerine compounds are clearly a derivative work of my post and are therefore subject to my license.
cool ! (Score:1)
Congratulations (Score:2)
Re:Congratulations (Score:5, Informative)
No one knows the effects of an 25 Tesla magnet on biological tissues. In addition, in order to get useable information out of an MRI system, one must hit it with radiofrequency (RF) waves. The higher the static field is, the higher these frequencies are going to be. A 7-tesla magnet uses frequences around 300 MHz. Therefore, by extrapolation (which I believe is right, since I know that a 9T system uses about 383 MHz), a 25 Hz system would need about 1.1 GHz. This might very well be extremely detrimental to biological tissue. In other words, to do MRI, you'd have to cook your sample.
Finally, to truly achieve a resolution advantage, you will need very powerful gradients. The gradients one would need to take advantage of such a system would be gigantic, at least tens if not hundreds of Tesla per meter. This would be very difficult to design for samples as large as a human body, if not impossible with today's technology, and at the very least extremely expensive.
Personally, I can see a 25 Tesla magnet being useful, just not for MRI. Perhaps for NMR being using not for imaging purposes, but in the study of non-soft condensed matter systems (i.e. not biological or organic, but solid state). It would be useful for examining superconductivity also.
Re: Floating Frogs (Score:2)
They ought to give up on MRI's and just concentrate on implementing the EXTREME SPORT of magnetic field weightless floating. If a frog can do it, so can I! It would be such a *gnarly* diamagnetic buzz!
DUDE!
Re:Congratulations (Score:5, Informative)
BTW, at smaller scales, things work a bit differently- it is much easier to make powerful gradients over a small distance (say a few millimeters, or hundreds of microns) than it is over larger ones (say a human torso, or even a forearm). I wish I could be more specific about this, but my theory background on MRI is still a work in progress- I hope I didn't screw anything up in my post above. Any MRI geeks out there, feel free to correct or add anything I missed.
Re:Congratulations (Score:2)
Re:Congratulations (Score:1)
Re:Congratulations (Score:2)
Plus - in many cases researchers cheat a little by cooking the samples at temperatures like 60C anyway. Higher temperature means more diffiusion which means narrower peaks in high molecular weight sampl
Re:Congratulations (Score:2, Funny)
Re:Congratulations (Score:2)
Still, you're right of course, any advances in magnet technology will be welcome
As for MRI people. They generally work at much lo
Re:Congratulations (Score:2)
And at fields of 25T, you have to take the relative permeability of the sample tube, RF coil and whatnot into account.
OTOH, this magnet could be nice for doing NMR of quadrupolar nuclei - the linewidth due to qudrupolar interactions stay the same, but the chemical shift will increase.
Football? (Score:5, Funny)
Re:Football? (Score:1)
That's the dumbest fucking question in geekdom (Score:2)
"Are you sure you're a geek?"
I know that was (partially) a joke, but I'm sick and tired of the idea that geeks can't like sports, or they're not real geeks. Where is it written that we can't like football or baseball or basketball or auto racing? Are we THAT FUCKING PATHETIC? Are we REALLY going to limit ourselves to basement D&D sessions with other geeks, or writing software for our only means of fun?(You porn mavens shut up now.......)
Good God, who said
Football is a VERY rigorous sport mentally (Score:2)
Just think about all of the things that have to be considered...
If you're a defensive coordinator, all manner of things are running through yo
Re:Football? (Score:2)
OHHHHH, OOOOH OAAH, OAH, OH O-OH...
(mindlessly raises hand and makes chopping gesture)
Nevermind.
Yeah, they rock allright... (Score:2)
But what matters most is that you've successfully misidentified the school in question, and their mascot. Un
Another railgun link (Score:3, Informative)
They have a detailed overview of the physics involved, too.
Is there any breakthrough here? (Score:3, Interesting)
Re:Is there any breakthrough here? (Score:5, Interesting)
It is a bit more tricky than just 'add more coils' or 'use more current'.
Back at university we had a 14T He cooled magnet. Reaching 12T was standard. No issues. But having 2 more Teslas out of that thing took many tricks: pumping off the Helium to make it even colder, increasing current near the limit. The thick copper cables got pretty warm. And heat and superconducting coils and Helium don't mix well, so for us, 15T was unreachable.
It's not unsimilar to the 10s/100m in athletics: Everyone get's close, but it took some time until someone finally was faster than 10s.
20T was the limit for 'usual' magnets. Getting more needed a new trick. But I admit that for people not using this stuff, it looks very much like no particular breakthrough. Like I never cared if I can run 100m in 10.1 or 9.9s. It's just 2% difference after all, isn't it?
Explosions? (Score:3, Interesting)
Yes there is a breakthrough here (Score:2, Informative)
The wire used for helium-cooled supercon magnets (Nb-Sn or Nb-Bi alloys) has performance envelope that limits the conditions under which it will superconduct. The factors describing this envelope are
Getting to 20T was accomplished by
The problem with railguns (Score:4, Interesting)
Re:The problem with railguns (Score:5, Informative)
Thats the main problem. Else you could just throw a bagload of teflon on the slug and fire away.
The main problem is not physical abrasion, but the fact that even if the projectile fits perfectly, the current density creates arc discharges between rail and slug, vaporizing the top layers
25 Tesla (Score:1)
question: Is that charge spoken of a static charge? If it is, how big is that charge compar
Re:25 Tesla (Score:5, Informative)
One electron has a charge of 1.6E-19 Coloumbs, so you are talking about the equivalent of 6.7E18 electrons moving at 1m/s. One coulomb is the amount of charge that passes through a point in a wire in one second which is carrying one Amp of current.
The instantaneous force being described would be perpendicular to both the motion of the particle and that of the magnetic field. Make a gun with your right hand, let your index finger point in the direction of the charge, let the field point in the direction of your thumb. Stick out your middle finger so it makes a right angle with both digits, and that is the direction of the force.
Re:25 Tesla (Score:1)
If you are referring:
F = k (|q1|*|q2|)/r^2
Then it doesn't really have to do with motion.
Who knows, I'm just getting started with E&M physics.
Re:25 Tesla (Score:5, Informative)
In that case, the equivalent of Coulomb's Law becomes
F=q(E+v x B)
Here, F is force, q is the charge that is moving, E is the electric field (if present, you may remember something like E=kq/|r|, which is basically the force law you listed divided by a charge, giving units of Newtons/Coulomb), v is the velocity of the moving particle. All quantities in bold refer to vectors, so they not only have magnitude, but direction. In the case of the weber definition above, there is no electric field, so that part has no contribution. We are then left with:
F=q(v x B)
Here, the x does not just mean normal scalar multiplication but vector multiplication. All this means is to take into account the angles between the directions of the velocity and the magnetic field. Either way, the force will be perpendicular to both, so if you can imagine drawing lines indicating the velocity and magnetic field lying in a plane, the force the particle experiences points straight out of that plane. The more in line the velocity and field are (i.e. the smaller the angle they make relative to one another in that plane) than the smaller the force will be. If the particle is moving in the direction that the magnetic field points in, then it will experience no force- again, this is a result of the vector multiplication (better known as the cross product, where A x B=|A||B|Cos[theta], where theta is the angle between A and B.
Make sense? If you have questions, post them here.
Re:25 Tesla (Score:1, Funny)
Re:25 Tesla (Score:2, Insightful)
| A x B | = |A| |B| sin[theta]
i.e. you forgot the magnitde on the left hand side and it's sin instead of cos
Re:25 Tesla (Score:2)
How do you know it's sin? Because when theta is 0 degrees, you will reach a minimimum (i.e. the velocity and field vectors line up, so no force), and when it's 90, you get a max (i.e. they are perpendicular). Of course, we are also considering only constant fields and velocity that are not position-dependent.
Re:25 Tesla (Score:2)
Re:25 Tesla (Score:2)
You get a carrier density of 10^23 cm^3 with a charge of e =1.602*10^-19 each.
so you have around 10000 coulomb per cm^3.
Compared to capacitors, a coulomb is a lot, but in metallic conductors a lot of charge is moving, which results in very low carrier speeds (typically around 1cm/s under normal circumstances).
But with those magnets, you have much higher current densitys and those forces become one of the main problems designing them. They are heavily reenforced with aluminium structures bec
Re:25 Tesla (Score:2)
A coulomb is just a certain number of electrons [gsu.edu]. Magnetic forces act on any charged particle in motion, so the units for the strength of a magnetic field are the amount of force on a certain number of charged particles moving at a certain speed.
How much is a coulomb? Besides saying that it's 16 billion billion (1.6e19) electrons, it's easier to think about what that amount of electrons
Re:25 Tesla (My that's a lot) (Score:1)
My that's a lot of BBQs.
Reminds me of Australia in the Summer.
Railgun: Repeatable Access Denial System (Score:3, Funny)
Since they are working on a system called "Repeatable Access Denial System" they just have to be mentioned on slashdot!
Huh? (Score:1, Funny)
> rated a superconducting magnet at 20 Tesla, which is 400,000 times
> the magnetic field of the earth. The new record is now 25 Tesla,
> which has a generated magnetic field of 500,000 times that of the earth.
I only hope they deactivated the first before turning on the second!
Re:Huh? (Score:4, Informative)
So it is kind of a matter of concentration. Your keys aren't going to flying out of your pocket b/c these magnets get turned on, nor will they affect your compass because you are too far away from the space that they affect. The earth on the other hand will affect your compass, because you are in its (fields) area of affect.
There are also potential medical benefits (Score:1)
It is great that such breakthroughs in magentic technology are being made, and I hope that these gains can be put to use in the medical field, especially now with so much of the poplulation entering old age.
Re:There are also potential medical benefits (Score:3, Interesting)
That is entirely true - those that sell the things to the credulous can afford a high standard of health care.
If you are old enough to read this and comprehend words such as "carpal" you are most likely older than the whole magnetic scam - unless you include the last time this was done by discredited folks such as Mesmer well over a century back (yes - it was a joke then to
Re:There are also potential medical benefits (Score:2)
*click*
*HMMMMMMMMMMMMMMMMMMMMMMMMM*
No more arthritis Grandpa?
Advanced Technology (Score:5, Funny)
http://www.fsunews.com/vnews/display.v?TARGET=sho
Thats one hell of a soldering iron.
Silly question from the ignorant (Score:5, Interesting)
Re:Silly question from the ignorant (Score:4, Informative)
Re:Silly question from the ignorant (Score:1)
Re:Silly question from the ignorant (Score:1)
Not ignorant about magnetic fields, mind you, in that respect your answere was quite correct, although it would have benefited from the use of the term 'Inverse square law'.
Ignorant, only because there aren't any wolves at the poles. You would just freeze to death, and probably go a few thousand years frozen on the ground without getting eaten
Re:Silly question from the ignorant (Score:2)
Due the dipolar moment of the magnet, you dont have inverse square, but inverse cubed.
If it is a more complicated device (sextupol, ect), there can be even higher falloff exponents.
Re:Silly question from the ignorant (Score:1)
Mirror (Score:2)
http://www.darkfire.net/mirror/68.185.174.190/rai
Re:Silly question from the ignorant (Score:1)
Somewhere in the deep space, a red light starts blinking...
Re:Silly question from the ignorant (Score:2)
World record? Where? (Score:4, Interesting)
High Field Magnet Laboratory [sci.kun.nl] in Nijmegen have a much stronger claim
to world records... (33T continuous, 60T pulsed).
Where is the world record?
Re:World record? Where? (Score:3, Informative)
So yes... relatively speaking, I'm not so sure the FSU's world record is so impressive. Guess this advance could lead to advances in hydrid magnets though...?
Frogs (Score:1)
frog movies [sci.kun.nl]
Re:World record? Where? (Score:2)
NHMFL also holds the records in other areas: (45 T continuous, 70 T pulsed) [nhmfl.gov] Before NHMFL, I believe the records were held by the Bitter Lab in Massachusetts.
I used to work with some of the NHMFL guys. Go 'Noles!
In Other News... (Score:5, Funny)
Re:In Other News... (Score:3, Interesting)
On the bright side of things, this is a great way to circumvent those drivers license scanners bouncers use at bars to record who has stepped in to drink- a sign of Big Brothe
Re:In Other News... (Score:2)
31 T (or greater) Hybrid Magnets (Score:3, Interesting)
I saw a hybrid magnet in the Insitutue of Materials Research (KINKEN) in Tohoku University (Sendai, Japan) with a maximum field of 31 T.
http://www.imr.tohoku.ac.jp
I got the impression that there are other devices (worldwide) with even higher continuous fields.
FSU Football Team (Score:2, Funny)
College Sports (Score:1, Offtopic)
(Ok - we also develop our beerguts and identities in college, but the College itself does not sponsor that)
Re:College Sports (Score:3, Insightful)
At FSU, Seminole Football pays the bills. This is the Magnet that Bobby Bowden built. Even if none of the revenue paid for this research directly, it paid for a lot of other programs that would have been competing for those dollars at budget time.
Re:College Sports (Score:2)
Glad he's not an english major (Score:2)
He sounds like one of the Cosby kids: "You said for to not for to drink your dreeeenk!"
But did they check properly? (Score:3, Funny)
Re:But did they check properly? (Score:1)
new MRI application? (Score:1)
Re:new MRI application? (Score:2, Informative)
Re:new MRI application? (Score:3, Interesting)
First of all, you would have the slight problem of buildinga magnet with a bore large enough to fit a car through... Because the magnetic field strength is proportional to the inverse of the square of the distance, that would have to be a freakin powerfull magnet to fit a truck through.
Assuming that you could build a magnet that large, one would then have a slight problem that any and all ferrous-metallic parts in the car or truck would be attracted to the magnet. Essentially, the ma
Microwave gun would be cooler (Score:1)
er.. (Score:1)
(sound of gun shot off stage)
Energy storage/regulation applications.. (Score:4, Interesting)
Perhaps, after the recent power outages in the US, the most important application of supercoducting magnets could be power storage. There seem to be 2 ways they are used - either to make friction-free magnetic bearings for traditional flywheel systems, or (more interesting) direct short-term storage of power. For situations where you need to temporarily store a *lot* of power this is an interesting technology alternative to batteries/hydro/etc.. Current devices seem to cover mainly very short term variations, but what about covering longer term regulation (hours/days) of variable power from a wind-farm, or solar, for example?
Anyone got more gen on this?
Try Superconducting Magnetic Energy Storage (SMES) Systems [azom.com]
This link [e-cavern.com] describes a commercial device that stores 3 megawatt-seconds..
Re:Energy storage/regulation applications.. (Score:2)
At 80T, the energy density of the magnetic field is about the same as gasolene. 25T would have about 1/10th of that energy density, which is nothing to sneeze at. What I see as the big problem with using this for SMES is getting the energy in and out of the magnet fast enough to be useful (magnets can get really unstable when slewed too fast).
If we had a dozen or so SMES facilities (1 GW, 60 seconds storage time) scattered around the northeast, it is likely that the great blackou
clarification (Score:2, Informative)
WoooHoo (Score:1)
Tallahassee (Score:2, Funny)
Gay Goaters!!
Woah, back off with the big words! (Score:4, Funny)
What makes you think people here know something about 'football'?
Only for superconducting magnets? (Score:1)
Does this mean that there are 100 Tesla NON-superconducting magnets in someone's basement? One would think that superconducting magnets would be stronger than regular ones, but maybe not. Maybe someone's got an ultramagnet hooked directly to a nuclear power plant with 3 foot diameter copper cable windings that puts out even stronger fields...
Magneto would be very proud. (Score:3)
And another thing - where's the radiant electricity that they promised to beam from towers in 1900? Transmission lines and power cords - blech.
Re:Magneto would be very proud. (Score:2)
There was a company that came out with lightbulbs that worked of radio waves. nedles to say, the radio industry went nuts.
Some tidbits of info... (Score:4, Informative)
Out of curiosity, I just looked up their electric bill online [talgov.com], but it lumps the Mag Lab's usage with multiple other FSU buildings... The total bill was $500k this month, so it must be an amount less than that.
Florida develops it's own answer to it's spammers (Score:2)
Re:FSU? (Score:1, Offtopic)
Re:Weapon (Score:2)
Re:Weapon (Score:2)
Re:Weapon (Score:2)
Now if you were to inject a bunch of fine iron fillings, you might have a case, but you would also be very dead before the blood ever got sucked out.
Re:Schtarker! (Score:2)