Stupid Thunderstorm

[Jon Miller]

We had a thunderstorm a couple days ago. Apparently it destabilized our hydrogen cryo units, which means our superconductors can't work. So our accelerator is down for a couple of days...

Jon Miller

[Az]

oooookay....

[Jon Miller]

Well, I wanted to post it here as a Oh No...

And maybe have some conversation today. Normally I would post it in CG.

Jon Miller

[Kuciwalker]

Re: Stupid Thunderstorm

Originally posted by Jon Miller
We had a thunderstorm a couple days ago. Apparently it destabilized our hydrogen cryo units, which means our superconductors can't work. So our accelerator is down for a couple of days...

Jon Miller

What kind of accelerator?

[Jon Miller]

https://www.jlab.org

Jon Miller

[Terra Nullius]

Ooooh! Supercondidlyuctors.

What's a CG?

[TCO]

Why are the cryo units affected by a thunderstorm? Did you lose power? And do you really need hydrogen? Can't get by with helium?

[TCO]

Oh...and if you want free drinks/dinner/place to crash while coming thru Richmond some time, let me know.

[Jon Miller]

We don't actually use the hydrogen much...

In fact, we started back up, it is just all the other Halls which can't run. It is the end station that got messed up, but we aren't using the standard equipment, so we aren't using the hydrogen it provides.

Not sure about the details of hydrogen versus helium. But the equipment is set up to use hydrogen and that is what we can provide.

At first I thought it was some other point, which would effect the parts of the accelerator. But the end station isnt' nearly as crucial for us.

Jon Miller

[Jon Miller]

Originally posted by TCO
Why are the cryo units affected by a thunderstorm? Did you lose power? And do you really need hydrogen? Can't get by with helium?

apparently a small power blip can start them oscillating and cause failure a day or so later

Jon Miller

[TCO]

Originally posted by Jon Miller
We don't actually use the hydrogen much...

In fact, we started back up, it is just all the other Halls which can't run. It is the end station that got messed up, but we aren't using the standard equipment, so we aren't using the hydrogen it provides.

Not sure about the details of hydrogen versus helium. But the equipment is set up to use hydrogen and that is what we can provide.

At first I thought it was some other point, which would effect the parts of the accelerator. But the end station isnt' nearly as crucial for us.

Jon Miller

He goes to 4K. Pumped He a bit lower. H can get down to ~1K. Would think with niobium alloy that He would suit you fine. The Tc is 20K I think.

[TCO]

Originally posted by Jon Miller


apparently a small power blip can start them oscillating and cause failure a day or so later

Jon Miller

Could you be a little bit more descriptive? Little more scientific? WHat is them? Describe the oscillation and the method of induction. Oh...and failure. Describe that too.

[Jon Miller]

Originally posted by TCO


Could you be a little bit more descriptive? Little more scientific? WHat is them? Describe the oscillation and the method of induction. Oh...and failure. Describe that too.

I talked to somebody who talked to somebody, who got a message from people who looked into it. So it isn't something I know too much about it.

I think failure means that it can't keep the H2 chilled anymore. I am not anywhere close to writing my thesis so all the other bits of the experiment are a bit unkown to me (in particular the accelerator which is a different department). To give an idea of the scale, the detector I am responsible for (and am an expert on) weighs 80 tons. To run for a day (this doesn't include salaries and the like) costs 1/4 a million dollars for the experiment and there are going to be on the order of 200 people on the publication.

Jon Miller

[TCO]

Are you the first author?

[Kuciwalker]

Ah. That's just a little bit smaller than the accelerator I worked with...

http://www.dt.navy.mil/sur-str-mat/fun-mat/pow-sys-bra/tan-pel-pos/index.html