Magnetic disturbance

Kaff...kaff..kaaaaffff...

RL

Perhaps someone is entering an EM railgun into the annual pumpkin chucking contest.

-- Paul Hovnanian mailto: snipped-for-privacy@Hovnanian.com

------------------------------------------------------------------ What if no one ever asked a hypothetical question?

Try downloading data from the USGS National Geomagnetism Program at: Skimming the various strip chart graphs shows some rather radical short term variations. Where are you and what was the date and time of the event so I can play with the numbers? Looks like the real time graphs only go back 4 days.

--
Jeff Liebermann     jeffl@cruzio.com 
150 Felker St #D    http://www.LearnByDestroying.com 
Santa Cruz CA 95060 http://802.11junk.com 
Skype: JeffLiebermann     AE6KS    831-336-2558

** Jaime is a fake name, the guy is " Maynard A. Philbrook" - a radio ham - his call sign is KA1LPA .

He is an utter idiot and an egomaniac.

He haunts usenet purely to BIG NOTE himself.

** So he can keep control over the discussion, same as any troll does.

You sound like smart guy, stop wasting your time with the idiot.

.... Phil

Ha, quit.

It does not take much to whack out the system from the top side of the vault, it's not protected that well and is cordoned off when in operation.

I suppose some atmospheric abnormally could disrupt it. I know near by strikes from T showers does nothing to it, at least not enough for it to get spassed out.

Talking about pumpkins, I stopped at a place today and got talking to the clerk and he mention how he has this young labrador mix, he let him out side for a bit and the lab chewed up half of the pumpkin he put the the steps.. So any one that has dogs, beware, I guess some of them like pumpkins.

Jamie

That would be Weds Oct 24th.

If true, that probably answers your question.

Plan your disasters carefully.

I thought you were doing wafer fab, not electron beam welding.

Looks like you're on the east coast. Virginia would be the closest observatorium: Argh. The GIF files are generated on demand. If you get garbage instead of a graph, just get a cup of coffee, hit refresh, and it should be there. For Oct 24th. Ugh, I can't tell which is the correct day, but they both have the same dip: Looks like some kind of event at 1PM UTC, which would be 8AM EST. However, the intensity variations (H field) of 50-75 Newtons doesn't seem to much different from any other days variations.

Checking if it's the moon: Nope. On Oct 24, the moon was below the horizon for most of the day.

Ok, so were there any crop circles on the lawn, missing secretaries (alien abduction), or mysterious obelisks appearing out of nowhere?

--
Jeff Liebermann     jeffl@cruzio.com 
150 Felker St #D    http://www.LearnByDestroying.com 
Santa Cruz CA 95060 http://802.11junk.com 
Skype: JeffLiebermann     AE6KS    831-336-2558

This happen in the middle of last week.. and I did check one of those sites. As best as I understood it, it does look like some red hot spot was over our area just about at that time. That is, if I read the image and data correctly.

It's really weird and not the first time this has happen.

But, can't let that get in our way, even though it force a lot of work on the machine operators to pull back the product they were running though it to make sure it got a proper dose. Some of the products run through it takes 2 people just to pick up one end.

Jamie

Phil, you're embarrassing yourself, again..

The offer is still open to come to the states for some good drugs to get you docile and subservient. You'll work out well for a door stop.

Phil I got to say, you are way off base about what you think you know about me and it's so funny it makes me laugh and the guys at work get a kick out of it when they see the posts you make. Just another poor sap from down under that has lost their way.

Jamie

Egads, a major power user. It's going to take a rather large magnetic field to move such a high power electron beam. I was thinking in terms of electron beam lithography in a wafer fab, which is probably more sensitive to magnetic fields than your monster.

Well, maybe a CME (coronal mass ejection) landed some charged particles on your wiring adding a DC component to whatever you're using to feed the ray guns. It wouldn't take much DC on the power lines to create a magnetic field inside the building: Well, there was a solar flare on the 23rd, but no CME. Ok, I give up.

--
Jeff Liebermann     jeffl@cruzio.com 
150 Felker St #D    http://www.LearnByDestroying.com 
Santa Cruz CA 95060 http://802.11junk.com 
Skype: JeffLiebermann     AE6KS    831-336-2558

hell no, we do cross linking of insulating materials. Other people use the same type of equipment to irradiate food, tires etc...

I don't know how much energy is involved with wafer fabrication but we can go up in the range of 2.5 Mev on a couple of the machines with a large scanning area. One of those machines are fed with paired 750MCM feeds from the buss, that is each phase has a pair of 750MCM, the other machines use paired 500MCM

We met up with some one about 5 years ago now, that has a unit that requires a dedicated feed from the electric company, lots of power there. They irradiate anything for any one accept petroleum, that is done with a proton accelerator.

We do custom electronics for other operations in the business too, everything we do stays in the circle of the company. We do not design anything for commercial applications out side of what we do there or what ever one of our other locations may need.

Out side of that, I do get into designing electronics that is not related to my job. The last big adventure I got into was redoing an eddy current heat treating process inverter system, that was fun. snack toy money.

Jamie

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E-beam wafer fab work doesn't involve a lot of energy. It's just exposing an electron-sensitive resist, typically for less than a microsecond. The standard Cambridge Instruments set-up was built around their S-250 electron microscope, which only went up to 40kV - there was some interest in getting it up to 100kV, but I don't know if it got anywhere.

While you gained from the finer focus, you lost from the spread of the high-energy secondaries in the silicon under the resist.

--
Bill Sloman, Sydney

It's not power that matters, but voltage. The faster the electron is travelling, the harder it is to bend it's path.

And you bend the path of each electron by the same amount. A moving electron does constitute a current, but not a large one.

--
Bill Sloman, Sydney

On a sunny day (Mon, 29 Oct 2012 09:09:49 -0500) it happened Jamie wrote in :

I was thinking last night that teh little flux gate compass I build did detect me with a celphone walking around in the room. The magnet is in the speaker and also the little vibration buzzer of thw phone. I have an other 3D fluxgate compass module from ebay, wrote C code for that, works OK, but you have to calibrate that stuff. there are also magnetometers that need no calibration. To detect peoplw with cellphones or othwr magnetic stuff you could put one next to the doors, and connect it to a level detector and trapdoor lock to prevent them from entering. Alligator are optional. I know I do not like to turn in my cellphone, and I can imagine many people not reporting magnetic items like that. Not sure if the idea works, or that is the cause of course.

We didn't have any issues with the electrons impacting on a non intended target. It was a problem with the aperture heating up due to some disturbance that forced the steering out of alignment enough to abend the system. On top of that, it saturated the sensor array we have attached on the out side of the protected vault walls.

btw, we have a storm coming in on us and they called me this morning to notify me of them canceling operations at our facility. So i'll be here to aggravate every one, including you.

Jamie

True but, the units we have do not all come off the same transformers and they are located far from the location.

Even though we are generating lots of energy, still does not actually take that much to move the beam, when the train passes by behind the building we can notice a slight shift in the machine that is closes to the tracks, steering is critical. On the original machine, which is still in operation, focus coils have been added but not for focusing and a couple of small permanent magnets are position just above the scan horn to correct for an obstruction in the structure so the beam will scan in a straight line.

We are thinking of using a DDS type system to generate a AB pattern so we can create custom steering for problems like these. The manufacture of the machines told us they once tried to engineer a multpoint ramp signal generator ref for the scan amps but didn't have much success with it at the time. I guess they had an array of 10 turn pots to set each point into a summing circuit from a digital IO mux chip.

Playing with present DDS technology at the board level would be a first for me ;)

Have a good day. Jamie

[...]

Or this:

--
Regards, Joerg 

http://www.analogconsultants.com/

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I've used a variac and coil to deguass things. (tweezers and small tools.)

George H.

I had the problem while trying to trim hybrid resistors with a sand blaster and later a laser. Besides the earthquake simulating vibration from the passing trains, there was the slight tilt in the concrete slab foundation when the train was parked near the building. The weight of the train would cause the foundation to tilt, ruining the laser alignment. I found the problem by setting up an optical (non-laser) tilt measuring contraption using a distant mountain top reference point. Actually, that was a marginal idea because I found myself measuring tides and freeway traffic. When the number of cars on a nearby freeway increased during rush hour, the ground would sink sufficiently to deflect the inclinometer. However, it did demonstrate that train induced foundation tilt was the primary culprit. Speculation was that the building was floating on the water table, but that was never proven. Until the system was rebuilt to be less sensitive to building movement, we posted the train schedule on the wall, and production arranged to have breaks when the trains were scheduled to pass.

My sense of smell tells me that the problem has something to do with the utility power, but exactly what and how, I can't deduce. Are you doing any monitoring of the DC component of the utility power? Perhaps even order harmonic distortion, which would show up as a change in waveform symmetry?

--
Jeff Liebermann     jeffl@cruzio.com 
150 Felker St #D    http://www.LearnByDestroying.com 
Santa Cruz CA 95060 http://802.11junk.com 
Skype: JeffLiebermann     AE6KS    831-336-2558

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Uh, Jeff, that's nanoTeslas, not newtons