Development for LHC@home

https://op-webtools.web.cern.ch/op-webtools/vistar/vistars.php?usr=LHC

Ok we went long enough without a *Science thread

If you go to "Coordination" in the drop-down menu at the top of that web-page you will get an overview of what the plans are for the next few days. Currently injection-gap cleaning and scrubbing. (Not sure exactly what the first is, but I think the second is running beams around so that the losses spray the beamline with energy and help outgas the surfaces to get a better vacuum.)

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Looks like we're going for science this weekend! The LHC site (above) is looking good. If you want to see a snapshot of the CMS status look here. There may be better monitors now, I haven't taken the time to look for them lately.
I think I can mention this now; if you saw the initial pictures of 13 TeV events from the experiments you might have wondered, "Why are ATLAS's tracks curved but CMS's are straight?" Well, we had a problem with our magnet. I'm pretty sure I can't go into the details yet (if you've seen them publicly, then I'm wrong there...) but since the beginning of this week we're back up to 3.8 T on the central magnet so we have curved tracks and are hunting exotic Higgs, supersymmetry, extra dimensions and mini black-holes again!
...and if that info costs me my job, I'm only 14 months away from the National Retirement Age anyhow... :-/

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Oops, sorry, that CMS link hasn't been updated lately! If I find a more-updated one I'll post it. :-(

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Ivan I'm sure you will still be able to climb these stairs when you retire




It sure takes my slow dsl a while to load your nice picture Ivan



....well that was a bit faster

Magnet problem again?

Fermilab again?

A quick troll through the daily reports shows no significant CMS problems. Guess I'd better start reading them more carefully again, now we're up and running -- I'd gotten out of the habit during the shutdown.

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A quick troll through the daily reports shows no significant CMS problems. Guess I'd better start reading them more carefully again, now we're up and running -- I'd gotten out of the habit during the shutdown.

Okay, so how many mb is one cup of coffee, and what beam current at 14TEv is required to brew it in 60s?

A quick troll through the daily reports shows no significant CMS problems. Guess I'd better start reading them more carefully again, now we're up and running -- I'd gotten out of the habit during the shutdown.

Okay, so how many mb is one cup of coffee, and what beam current at 14TEv is required to brew it in 60s?

Not sure what your "mb" abbreviation is... But assuming a cup of coffee is 200 ml, raising it to 100 C from 20 C is 16,000 joules; in 60 secs that's 266.67 j/s or watts. At 14e12 V, that'd require 1.9e-11 amps or 0.12e-9 particles/sec; last night we were running at ~3e13 pps -- what's that, 80,000 cups of coffee/minute?
I probably lost a zero or two here and there... :-)
[Edit] No, that was 3e13 protons per beam, not per second, at something like 11,000 orbits/sec, so factor in four more orders of magnitude, I guess. 800M cups...[/Edit]

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A quick troll through the daily reports shows no significant CMS problems. Guess I'd better start reading them more carefully again, now we're up and running -- I'd gotten out of the habit during the shutdown.

Okay, so how many mb is one cup of coffee, and what beam current at 14TEv is required to brew it in 60s?

Not sure what your "mb" abbreviation is... But assuming a cup of coffee is 200 ml, raising it to 100 C from 20 C is 16,000 joules; in 60 secs that's 266.67 j/s or watts. At 14e12 V, that'd require 1.9e-11 amps or 0.12e-9 particles/sec; last night we were running at ~3e13 pps -- what's that, 80,000 cups of coffee/minute?
I probably lost a zero or two here and there... :-)

Starbucks eat your heart out, here comes the LHC ;)

Especially since I revised my figure substantially upwards!
The figures are amazing (IIR them all C, CBA to gwgl for veracity):
o The energy in the beams at full tilt (we're not there yet this time of course) is something like that of an aircraft carrier doing 30 knots
o There's anough energy stored in the CMS magnet at 4 T to melt 80 tonnes of gold
o The energy in one p-p collision is equivalent to a mosquito flying into your face
o The energy stored in the beamline magnets, fed back into the grid on rampdown, would power the whole of Switzerland for several minutes

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I'll have two sugars in mine please :)

A quick troll through the daily reports shows no significant CMS problems. Guess I'd better start reading them more carefully again, now we're up and running -- I'd gotten out of the habit during the shutdown.

Okay, so how many mb is one cup of coffee, and what beam current at 14TEv is required to brew it in 60s?

Not sure what your "mb" abbreviation is...

Ah, nor am I now. It was either millibarns, or millibeans.

But assuming a cup of coffee is 200 ml, raising it to 100 C from 20 C is 16,000 joules; in 60 secs that's 266.67 j/s or watts. At 14e12 V, that'd require 1.9e-11 amps or 0.12e-9 particles/sec; last night we were running at ~3e13 pps -- what's that, 80,000 cups of coffee/minute?
I probably lost a zero or two here and there... :-)
[Edit] No, that was 3e13 protons per beam, not per second, at something like 11,000 orbits/sec, so factor in four more orders of magnitude, I guess. 800M cups...[/Edit]

Yea that sounds quite tasty, IF we can get that many cups/sec through the vacuum chamber... or would it be an external coffee-beam? I recall doing a lot of stupid calculations in REMs when I was much younger, but I suppose we might have to make a coffee-equivalence of the banana?

It sounds like a giant can of Rock Star to me.