Beta

×

Welcome to the Slashdot Beta site -- learn more here. Use the link in the footer or click here to return to the Classic version of Slashdot.

Thank you!

Before you choose to head back to the Classic look of the site, we'd appreciate it if you share your thoughts on the Beta; your feedback is what drives our ongoing development.

Beta is different and we value you taking the time to try it out. Please take a look at the changes we've made in Beta and  learn more about it. Thanks for reading, and for making the site better!

CERN LHC Reaches Its Goals For 2010

CmdrTaco posted more than 3 years ago | from the christmas-break-woohoo dept.

Science 90

Anonymous Dupaeur writes "The goals for the first run of the most powerful particle collider (and the most energetic storage ring since ISR) were recently surpassing the 10^32 level of luminosity, with a destructive 15 MJ energy per-beam. This is a significant milestone, opening the way to collect more and more data. The current plan is to stop the proton collisions soon, and provide an ion (Pb) beam and conclude this year with a X-mass break. The next year is expected to bring at least one inverse femtobarn of data, which is achievable with such beam power. After that, the entire accelerator complex will be shut down for a year, due to budget costs for science in Europe."

cancel ×

90 comments

Sorry! There are no comments related to the filter you selected.

X-mass? (4, Funny)

suso (153703) | more than 3 years ago | (#33896616)

conclude this year with a X-mass break.

Is that supposed to be some kind of punny joke?

Re:X-mass? (4, Funny)

WrongSizeGlass (838941) | more than 3 years ago | (#33896656)

conclude this year with a X-mass break.

Is that supposed to be some kind of punny joke?

It's just a subtle reminder to never cross the beams.

Re:X-mass? (0)

suso (153703) | more than 3 years ago | (#33896730)

conclude this year with a X-mass break.

Is that supposed to be some kind of punny joke?

It's just a subtle reminder to never cross the beams.

Its streams, not beams. Nice try though.

Re:X-mass? (0)

Anonymous Coward | more than 3 years ago | (#33897146)

Fucking puns, how do they work?

Re:X-mass? (0)

Anonymous Coward | more than 3 years ago | (#33897974)

whoooooooosh

Re:X-mass? (1)

geekoid (135745) | more than 3 years ago | (#33897116)

what about cross beams?

Re:X-mass? (1)

PingPongBoy (303994) | more than 3 years ago | (#33897422)

It's just a subtle reminder to never cross the beams

Yet another cross to bear

Re:X-mass? (1)

zAPPzAPP (1207370) | more than 3 years ago | (#33898106)

Does colliding beams head on count as crossing?

beams (0)

Anonymous Coward | more than 3 years ago | (#33899574)

Don't forget to remove the Beam from thine own eye before removing the Mote from thy neighbours eye.

I took out the Mote in Gods Eye once.

Borrrowed it from the library, a great read.

Re:X-mass? (1)

f3rret (1776822) | more than 3 years ago | (#33899706)

I thought crossing the streams was the whole point of the LHC.

Well crossing the streams and bringing about the apocalypse.

Re:X-mass? (1, Informative)

Anonymous Coward | more than 3 years ago | (#33897230)

conclude this year with a X-mass break.

Is that supposed to be some kind of punny joke?

Yes? :)

Later on they say The next year is expected to bring at least one inverse femtobarn of data. Barn is a unit of area. inverse femtobarn is collisions per that unit of area (10^-28 m. sq.) which is related to luminosity. The brighter the beam (ie, more crap in it that is focused properly) the brighter the luminosity, the more data you get.

From, http://en.wikipedia.org/wiki/Barn_%28unit%29

"It took Fermilab over a decade to achieve 1 /fb" (fb is femtobarn)

And yes, physics like to make these little puns everywhere. Physicists may not all like to play baseball, but you are sure to hear lots of jokes about how difficult it is to hit a round ball with a cylindrical bat such that it goes in the right direction...

Why do you think they called it a barn? To make jokes about it!!!

Why is Higg's Boson referred to as "god particle"? So it seems more important!

Puns are only thing physics have to relate to the "everyday world". Without that, you enter the strange world of a mathematician! :P

Re:X-mass? (1)

Monkeedude1212 (1560403) | more than 3 years ago | (#33897350)

If it was, I didn't even get it until you mentioned it.

I don't know if that's the best kind of pun, or the very very worst...

Shutting down (1)

us7892 (655683) | more than 3 years ago | (#33896760)

The cost is too high to run next year. That is disappointing.

Re:Shutting down (2, Informative)

Stenchwarrior (1335051) | more than 3 years ago | (#33896892)

It seems like they could solicit money from the rest of the world since their studies benefit everyone. I'm sure someone smarter than me has thought of that already.

Don't You Mean "Extort"? (1)

Greyfox (87712) | more than 3 years ago | (#33902190)

As in, "Give us money or we'll point our giant particle accelerator at your country and give you all cancer!" Evil laugh is optional...

Summary failure? (1)

Pteraspidomorphi (1651293) | more than 3 years ago | (#33897088)

The article says 2012. Is it 2011 already? Did my nap take THAT long???

Re:Summary failure? (1)

maxwell demon (590494) | more than 3 years ago | (#33897332)

Well, maybe the true reason is that they don't want to be blamed for the world ending in 2012 :-)

Re:Shutting down (0)

Anonymous Coward | more than 3 years ago | (#33897346)

They're just taking a break over the holidays...

Re:Shutting down (5, Informative)

the_other_chewey (1119125) | more than 3 years ago | (#33897626)

The cost is too high to run next year. That is disappointing.

Bad reporting. The LHC has scheduled maintenance in 2012.

However, CERN has more accelerators than just the LHC, and those will
be shut down due to financial constraints. They don't do much cutting edge
research anyway, so the science output is largely unaffected.

Shutting down the LHC for other than technical reasons isn't planned at all.

Re:Shutting down (2, Informative)

gbeagle2112 (1839198) | more than 3 years ago | (#33898248)

The reason for the shutdown in 2012 is to replace the faulty interconnects (too high resistance) in the quench protection system (QPS) which caused the accident in fall 2008. With the interconnects they have now they can only run the magnets at less than nominal current and still have the QPS protect the magnets from damage if there is a quench. Once these are replaced, the LHC should be able to operate closer to the design beam energy.

LHC may be shut down as well... (0)

Anonymous Coward | more than 3 years ago | (#33900442)

Right.

But the note correctly states that "entire accelerator complex", and not just LHC. If you could attend the meeting when the DG was announcing this, you could easily understand that the saving on the electricity due to the LHC's shutdown will help a lot to cut the budget. So now, only for 2012, but who knows what will happen next?

The upgrades (of LHC!!) were already postponed. For example LINAC4 and new SPS were postponed, the same will happen to PS. Perhaps PSB will be more lucky...

Re:Shutting down (1)

f3rret (1776822) | more than 3 years ago | (#33899840)

Well as I understand it, it is not just because of budget constraints that the LHC is being shut down, I seem to recall there being a story here on /. about a number of upgrades being planned for the LHC over the next few years.

Even so, the accelerator has produced a lot of data already, which needs to be processed by some theoreticians.

Re:Shutting down (0)

Anonymous Coward | more than 3 years ago | (#33903996)

I agree, though, last I heard they where only shutting down for winter(due to high 'on-peak' energy prices), and the requirements of scheduled maintenance.
I'm surprised they don't have their own power, a project like this should also have a sister-project, some high precision experimental reactor...

Anyway, it's not as if we've exhausted the data collected so far, we could use a chance to catch-up, especially before taking the next step... ...though I cant wait till they turn the LHC up to 11!

Soo.... (1)

BadAnalogyGuy (945258) | more than 3 years ago | (#33896772)

So you editors are going to go ahead and just post any old gibberish?

Re:Soo.... (0)

Anonymous Coward | more than 3 years ago | (#33896822)

Obvious troll is obvious

Re:Soo.... (1)

rakuen (1230808) | more than 3 years ago | (#33897032)

As said in a comment below, an inverse femtobarn is a measurement of collisions, not data, so he might actually be right on this one.

Inverse!!!! (1)

epiphani (254981) | more than 3 years ago | (#33896776)

The next year is expected to bring at least one inverse femtobarn of data, which is achievable with such beam power.

Provided the inverse femtobarn doesn't react at a quantum level with the inverse tacheons (they're BOTH inverse!) then we should be fine.

I hope someone has thought of the possible interactions here.

wtf is a inverse femtobarn? Great term though

Re:Inverse!!!! (4, Funny)

BadAnalogyGuy (945258) | more than 3 years ago | (#33896838)

Well, if a femtobarn is a really really small barn, then its inverse would be a really really small anti-barn.

When two such particles collide, you'd better get the flock out. At least that's the little I've herd.

Re:Inverse!!!! (4, Informative)

epiphani (254981) | more than 3 years ago | (#33896974)

This is my favorite bit:

10^-40 meters square = picobarn
10^-43 meters square = femtobarn
10^-46 meters square = attobarn
10^-52 meters square = shed

Re:Inverse!!!! (1)

BadAnalogyGuy (945258) | more than 3 years ago | (#33897302)

My favorite bit is 1<<12

Re:Inverse!!!! (0)

Anonymous Coward | more than 3 years ago | (#33897362)

That one is nice. Although it wouldn't be the same without the others.

Re:Inverse!!!! (1)

pahles (701275) | more than 3 years ago | (#33898668)

My favorite bit is 0. Where 1 is looking so inflexible, 0 shows the roundness I like.

Re:Inverse!!!! (1)

Jeremi (14640) | more than 3 years ago | (#33899990)

My favorite bit is 0. Where 1 is looking so inflexible, 0 shows the roundness I like.

... and my favorite light-switch is "off". Wait, what?

Re:Inverse!!!! (1)

md65536 (670240) | more than 3 years ago | (#33903618)

... and my favorite light-switch is "off".

My favorite number is potato.

Re:Inverse!!!! (1)

srussia (884021) | more than 3 years ago | (#33898922)

10^-52 meters square = shed

Hey, don't knock it until you've experienced a shedload of uhhh... collisions with Caltech girls.

Re:Inverse!!!! (3, Funny)

treeves (963993) | more than 3 years ago | (#33903824)

Reminds me of that guy in a Monty Python skit: Arthur "2x10^-52" Jackson.

Re:Inverse!!!! (1)

maxwell demon (590494) | more than 3 years ago | (#33897366)

Actually, the inverse of something very small is very large. For example a millionth is very small. The inverse of it is a million which is very large.

Re:Inverse!!!! (2, Informative)

epiphani (254981) | more than 3 years ago | (#33896878)

Ok, wow, its an actual term explaining the number collisions. From wikipedia:

The "inverse femtobarn" (fb1) is a measurement of particle collision events per femtobarn. Over a period of time, two streams of particles with a cross-sectional area, measured in femtobarns, are directed to collide.

However, an "inverse femtobarn of data" still makes no sense.

Re:Inverse!!!! (4, Insightful)

DirePickle (796986) | more than 3 years ago | (#33897042)

You take the number of inverse femtobarns ( units of 1/area ) times the cross-section of the interaction/particle/whatever that you're looking for (which varies with energy) to get the total number events that you should see. So, inverse femtobarn is a good unit for amount-of-data-collected.

Re:Inverse!!!! (2, Interesting)

Ihmhi (1206036) | more than 3 years ago | (#33899206)

Could you tell us the formula for converting femtobarns into Libraries of Congress so the rest of us can understand this?

Correction (1)

Roger W Moore (538166) | more than 3 years ago | (#33899420)

....to get the total number events that you should see.

Actually that gives you the number of event that should be produced. The number that you should see also depends on your detector's acceptance and efficiency.

Re:Correction (1)

DirePickle (796986) | more than 3 years ago | (#33900140)

You're right, of course. I was omitting the caveat "with perfect efficiency".

Re:Inverse!!!! (4, Informative)

Rising Ape (1620461) | more than 3 years ago | (#33897106)

It's not really a measurement of collision events, though it is proportional to it. Think about it classically, for a beam of billiard balls, say. The number of collisions you get will be proportional to to the area of beam, the number of particles per unit area for beam 1, the same for beam 2 and the cross-sectional area of the balls. All the factors apart from the last are shoved together in the luminosity figure - which has dimensions of inverse area and the barn is a unit of area.

So the integrated luminosity (in inv. barns) * the cross-section of the process you're interested in (in barns) gives you a number.

In reality, the cross-sections don't correspond directly to physical areas (it's all quantum after all) but the principle is the same.

Re:Inverse!!!! (4, Funny)

BadAnalogyGuy (945258) | more than 3 years ago | (#33897138)

Wow. Your analogy didn't make anything clearer. I'm just as confused now as I was prior to reading your comment. Perhaps more so!

*sniff*

I'm so proud

In the future... (1)

Un pobre guey (593801) | more than 3 years ago | (#33897200)

In the future you will be able to buy reproductions of tacky watercolor paintings depicting landscapes with inverse femtobarns. Will they have a weathered texture to their walls? Will they be colorful or drab? Will they be upside down? Will they sell them at Ikea?

Re:Inverse!!!! (1)

petschge (967576) | more than 3 years ago | (#33897434)

wtf is a inverse femtobarn? Great term though

Enough collisions that you expect to see a collision with a cross section of one femtobarn once.

Re:Inverse!!!! (1)

AJWM (19027) | more than 3 years ago | (#33897794)

Thank you. Clearest explanation of an inverse femtobarn yet.

Since I have an idea how small a femtobarn is*, enough collisions to see one with that cross section is one hell of a lot of data.

(*Take a half teaspoon (about 3ml) of stuff, stretch stuff out into a strand a megaparsec long. It'll have a cross section of about 1 barn. Now take a quadrillionth of that.)

Re:Inverse!!!! (1)

tibit (1762298) | more than 3 years ago | (#33902580)

Epic explanation -- thank you!

What is the particle energy? (1)

catchblue22 (1004569) | more than 3 years ago | (#33897798)

The summary didn't mention how many MeV's the particles had. Is it that they weren't colliding the beams?

NOT shutting down due to budget cuts (5, Informative)

Anonymous Coward | more than 3 years ago | (#33896800)

Summary is incorrect. The LHC is NOT shutting down due to budget cuts. It was planned to shut down to accommodate the upgrade to full 7TeV beams. The budget cuts are responsible for shutting down other accelerators (not LHC). If you can even name one of these other minor accelerators, you know more about CERN than I do (and IAAPP).

Re:NOT shutting down due to budget cuts (0)

Anonymous Coward | more than 3 years ago | (#33897142)

Excuse me, but there is "entire accelerator complex", which is shut down due to cuts. This was even announced to the whole CERN employees by the Director-General, also, protests by the Staff Association took place.

The LHC is a different story, but obviously, to some extent, is included in the cuts. I can name all of these "med" or "minor" accelerators and experiments and I've seen most of them ;P

Re:NOT shutting down due to budget cuts (1)

TooMuchToDo (882796) | more than 3 years ago | (#33897436)

You're correct (as I glance at my LHC run schedule PDF that I probably shouldn't provide a link to). It appears the LHC is doing ion beam setup in a week or so (for two weeks), and then begins ion physics runs starting Nov 1st for 4 weeks. Still, lots of science to do before the upgrade.

Quite frankly, these CERN guys suck (0)

Anonymous Coward | more than 3 years ago | (#33897594)

You mean creating an Earth swallowing black hole wasn't on their list of goals?

Re:Quite frankly, these CERN guys suck (0)

Anonymous Coward | more than 3 years ago | (#33897766)

That one's scheduled for 2012. A week and a half into December, if I recall.

Re:NOT shutting down due to budget cuts (3, Informative)

afidel (530433) | more than 3 years ago | (#33899056)

It's also shutting down because the peak demand for electricity in that part of Europe is during the winter. It was always planned to be shutdown for upgrades and repairs during the peak demand months.

Re:NOT shutting down due to budget cuts (0)

Anonymous Coward | more than 3 years ago | (#33899466)

. If you can even name one of these other minor accelerators, you know more about CERN than I do (and IAAPP).

I name three: LINAC, PS, SPS.
I know more than you do.

I haven't been following this. (0)

Anonymous Coward | more than 3 years ago | (#33896818)

Have they used the Large Hardon Collider to make a black hole yet?

Everything still seems to be here, so I was hoping they tried it and everything went well.

Re:I haven't been following this. (4, Funny)

schmidt349 (690948) | more than 3 years ago | (#33896908)

There you go again, always complaining about black holes. You can bet that if they produced a whole gang of planet-destroying white holes it wouldn't even make the back page of the crime section.

Re:I haven't been following this. (2, Funny)

Chris Burke (6130) | more than 3 years ago | (#33898902)

Look, call me prejudiced if you want, but to me Supermassive Black Hole just sounds more threatening than White Dwarf. Or any kind of dwarf for that matter.

Re:I haven't been following this. (1)

sharkey (16670) | more than 3 years ago | (#33901946)

Hey, there is a large genre of pr0n dedicated to colliding Large Hardons with Black Holes. Lots of money to be made.

Re:I haven't been following this. (5, Funny)

suso (153703) | more than 3 years ago | (#33897046)

Have they used the Large Hardon Collider to make a black hole yet?

There has never been more of a need for the -1 obvious flag.

Re:I haven't been following this. (1)

damien_kane (519267) | more than 3 years ago | (#33898084)

There has never been more of a need for the -1 obvious flag.

Why is that?
If they did happen to make a black hole at the LHC, it would surely not be large enough to sustain itself.
It would loose its own mass via Hawking radiation much faster than it could absorb the mass around it (which, with it being in a vacuum, is quite a large distance, relative to the size of the bh itself).
Any blackholes created within the LHC shouldn't exist for more than a few femtoseconds.

Re:I haven't been following this. (1)

Mechanik (104328) | more than 3 years ago | (#33898452)

Have they used the Large Hardon Collider to make a black hole yet?

There has never been more of a need for the -1 obvious flag.

Obligatory: http://hasthelargehadroncolliderdestroyedtheworldyet.com/ [hasthelarg...rldyet.com]

Re:I haven't been following this. (1)

marcosdumay (620877) | more than 3 years ago | (#33899844)

And, just notice that this site uses Javascript to calculate its result. The answer is by no means hard coded in it...

Re:I haven't been following this. (1)

sznupi (719324) | more than 3 years ago | (#33897294)

I'm somewhat disappointed by this, it seems some at CERN might be, too [mediaarchive.cern.ch] (text in lower left part of the image)

I wonder if.. (3, Funny)

mswhippingboy (754599) | more than 3 years ago | (#33896852)

they'll have to take the femto-hay out to make room for all that data.

Re:I wonder if.. (1, Funny)

Anonymous Coward | more than 3 years ago | (#33897328)

I think they're more worried about what to do when the femto-chickens come home to roost.

Re:I wonder if.. (1)

Xyrus (755017) | more than 3 years ago | (#33903526)

They won't have to. They'll just feed it to the atto-cows.

Thank You Recession! (2, Funny)

Tablizer (95088) | more than 3 years ago | (#33896882)

After that, the entire accelerator complex will be shut down for a year, due to budget costs for science in Europe.

The Great Recession that Saved the World! Don't worry, our politicians are dutifully working on more.

Re:Thank You Recession! (0)

Anonymous Coward | more than 3 years ago | (#33897098)

It's due to it's power requirements.

Re:Thank You Recession! (0)

Anonymous Coward | more than 3 years ago | (#33897768)

Maybe its about the particle collision generated black hole due to happen in 2012 that will (would) take us into oblivion.
You guys know don't you? that thing called god particle that all the particles have to cross with to attain mass theory mashed up with the Maya Tzolkin 2012 end of Era by means of galactic alignment.
Those recession ideas are mere coins
MAAAD

Re:Thank You Recession! (1)

md65536 (670240) | more than 3 years ago | (#33903662)

It's due to it's power requirements.

But shutting down the LHC will cost too many jobs. They need to keep drilling with the 15 MJ beams, even if it causes another black hole in the gulf of mexico.

15 MJ energy (2, Funny)

Tablizer (95088) | more than 3 years ago | (#33896932)

with a destructive 15 MJ energy per-beam.

Actually, it's only 14.9999999.... MJ, so we're safe. [slashdot.org] Thank goodness!

Perspective (0)

Anonymous Coward | more than 3 years ago | (#33901118)

That translates to two days' caloric intake for a sedentary worker.

Re:Perspective (1)

lxs (131946) | more than 3 years ago | (#33905714)

Or one Domino's pizza.

X-mass break (0)

Anonymous Coward | more than 3 years ago | (#33896940)

That is the holiday where they suppress the higgs field causing the destruction of the universe. Which is not so bad if it stops those fruitcakes from being delivered.

Edit the original. (0)

Anonymous Coward | more than 3 years ago | (#33896968)

Were recently ... "achieved/reached" ... surpassing. Someone please edit that.

Its goals? (1)

gmuslera (3436) | more than 3 years ago | (#33897104)

But Earth still exis

Technological Terror? (1)

digitaldc (879047) | more than 3 years ago | (#33897416)

"The goals for the first run of the most powerful particle collider (and the most energetic storage ring since ISR) were recently surpassing the 10^32 level of luminosity, with a destructive 15 MJ energy per-beam."

Wait, are they trying to study particle behavior or build a Death Star?

femtobarn? (1)

Laxori666 (748529) | more than 3 years ago | (#33897480)

One inverse femtobarn of data? Is that the euphemism they're using nowadays for "one shitload of data"?

Re:femtobarn? (1)

maxwell demon (590494) | more than 3 years ago | (#33897614)

It's a unit.
1 barn = 10^-28 square meters
1 femtobarn is 10^-15 barn, i.e. 10^-43 square meters.
1 inverse femtobarn therefore is 10^43 per square meter.

The universe is at it again.... (1, Funny)

Anonymous Coward | more than 3 years ago | (#33897856)

You do realize that "Budget cuts force CERN to shut accelerators for year" is yet another example of the God particle coming back in time and preventing its discovery. Indeed I'd wager that this entire "Great recession" is do to the God Particle's insistence on anonymity. That or the theory that in this universe the CERN collider cannot operate else a black hole would open and swallow us all.

http://www.reuters.com/article/idUSTRE68G3NL20100917

Re:The universe is at it again.... (1)

melikamp (631205) | more than 3 years ago | (#33898656)

I am sure they thought of it. They will probably just open a micro-wormhole into the future and send Gordon Freeman, PhD, to smash the God particle with a crowbar as it starts moving back in time.

And the goal for 2010 were... (1)

Cylix (55374) | more than 3 years ago | (#33898012)

  * LHC did not explode into bits.
  * finally find the other side of that wormhole (spills out into a closet in it).
  * 30 consecutive days of no spontaneous human combustion.
  * Do not destroy the galaxy with spurious black hole generation.

The plan is... (0)

Anonymous Coward | more than 3 years ago | (#33899654)

to restart it on December 12th, 2012. Yikes!

How can their goals be considered reached? (1)

Drakkenmensch (1255800) | more than 3 years ago | (#33899972)

The earth hasn't been swallowed by a man-made pinpoint black hole yet!

What happened to all the black holes? (1)

tp_xyzzy (1575867) | more than 3 years ago | (#33899982)

Isn't LHC supposed to destroy the universe by creating some black holes? It'll be very disappointing if the 2 billion investment for LHC will not even destroy the universe. If I were putting my money on it, I would immediately want them back.

interesting... (0)

Anonymous Coward | more than 3 years ago | (#33901544)

It is very interesting that over the years the bar for "success" has steadily lowered for LHC. Right now, with this press release, they are years behind their initial schedule and around 1 order of magnitude behind the "obsolete" Tevatron collider run by the Americans. At this rate, Tevatron will have the Higgs long before LHC. There is something to be said for a little pressure (just a little) to encourage hard work and efficiency in science. It has worked wonders for Tevatron. LHC, with a (giant) secure budget and no competition on the horizon lacks a certain urgency one generally finds in scientific research. When one experiment commands more funding than many entire scientific disciplines you end up with some strange things. One day, we'll hear publicly about the first class plane flights, the catered lunches and the unusually soft work schedules, but for now... bringing such things up is forbidden.

Yes, this is anonymous, I'd like to keep my job. Criticizing the LHC is about the worst career decision for a physicist outside of espousing geocentrism.

Just turn it up to max already... (1)

jonwil (467024) | more than 3 years ago | (#33903336)

They should just turn it up to whatever the full power is and answer the question about the "higgs boson" once and for all...

Re:Just turn it up to max already... (1)

funwithBSD (245349) | more than 3 years ago | (#33908124)

It goes to 11^32, man!

Check for New Comments
Slashdot Login

Need an Account?

Forgot your password?
or Connect with...

Don't worry, we never post anything without your permission.

Submission Text Formatting Tips

We support a small subset of HTML, namely these tags:

  • b
  • i
  • p
  • br
  • a
  • ol
  • ul
  • li
  • dl
  • dt
  • dd
  • em
  • strong
  • tt
  • blockquote
  • div
  • quote
  • ecode

"ecode" can be used for code snippets, for example:

<ecode>    while(1) { do_something(); } </ecode>