where physics and life collide
Archive for November, 2009
Room numbers: more is better
Nov 30th
In case you were distracted by some obscure technical ramblings about “beams” and “collisions”, you may have missed our hugely important announcement regarding CERN building numbers. If your mind has not been blown by CERN’s building numbering system, well, you better sit down, because the numbering going on inside buildings is about to get a lot more amazing.
Let’s take a look at buildings 593 and 572, home of the technical training classrooms. The classrooms are spread across these two adjacent buildings, attached by a short corridor.
Rooms at CERN are labeled with three numbers: building, floor, and room number. This actually makes sense. For example, the meeting room on the first floor of building 160 is labeled 160 1-009. Fair enough.
But CERN’s elite Technical Training team layers its own advanced numbering system on top of this, in an attempt to bring more choice to the customer. According to economists, more choice is always a good thing. For example, you can choose to refer to the auditorium as room 10 or room 11. Your choice. Room 10 means the auditorium. Room 11 means the auditorium. Room 10 also means a totally different room. And room 11 also means yet another different room. So many choices! I feel liberated, from my sanity, that is.
“F-you” plot
Nov 27th
My wife was peering over my shoulder while I made some plots yesterday,
Wife: What’s that?
Me: Some of these plots are screwed up, I need to remake them.
Wife: It looks like it’s flipping you off.
This is the life of a high energy physicist: making plots, then figuring out why they seem to hate you so much.
(I picked a simple example here. It didn’t take me long to figure out that I was plotting the track eta of photons. Problem: photons don’t leave tracks. Nearly all the photons get the default value of 0. Solution: don’t be a dumbass, plot the calorimeter eta of photons.)
Collision time
Nov 23rd
This is a very quick update on the LHC status. About two hours ago they had both beams circulating and crossing at the experiments (see for example the CMSexperiment tweet). The experiments haven’t officially announced any collision events, though it is possible they have been recorded. If I hear more I’ll update.
For links to many different sources of up-to-date information see the “Beam time” post.
This is a nice milestone, but it should be noted that for now the beams are only at injection energy. This means that protons are accelerated to 450 GeV by a smaller (though still very impressive) accelerator, the Super Proton Synchrotron (SPS), and then are allowed to just coast around the ring of the LHC. This is about half the energy of the Tevatron at Fermilab.
Update: event displays from the first collisions are now public. There was a press release and a press conference. I’ve attached some ATLAS event displays.
Building numbers revealed!
Nov 23rd
If you have ever been to CERN you know that the building numbers here don’t make a damn bit of sense. If they do follow any kind of scheme, it’s not a scheme that helps you find buildings.
Building 3 is adjacent to 4, but connecting them is building … 58! About one km away is building 57. And no, it’s not chronological, because the most recent one built was 41, whereas certain older buildings are labeled in the 800′s.
Well today is a big day in my life, for I’ve just discovered, after seven years of bafflement, that there is a method behind the madness! The method, it turns out, is stupid as hell. It is revealed by this single-slide PowerPoint presentation:
We are eternally grateful to M. Fabrice Chapuis for finally bringing this to light.
I’d like to highlight some features of this numbering scheme:
- Buildings 400-499 are reserved for “Roads, Car Parks, Storage Zones”. Wait, what? Buildings ≠ Roads.
- Buildings 1000-1099 are reserved for “Roads, Car Parks, Storage Zones”. Buildings ≠ Roads.
- Almost every building at CERN could be called an office building, because they almost all have mostly offices in them.
- There are three CERN Hostel buildings, a budget onsite hotel for visitors. Two of these, 38 and 41, are rare examples of buildings with no offices whatsoever. Yet they are classified under “Offices and Laboratories.”
- Why use such limited number ranges? For example, we’re already up to 188 out of 199 under “Workshops, Warehouses and Garages.” And by the way, 188 is mostly an office building.
- Why is there a gap between 549 and 860? This will slowly drive me insane, if I’m not already.
I guess I’m glad to finally know the secret, but I think my head is going to explode anyway.
Beam time
Nov 20th
Hey LHC lovers, does something feel freaky déjà vu-ish? Hardware commissioning of the LHC officially completed two days ago. We are on the eve of the first circulating beam. They might even spit some protons around the full ring tonight. If only this wasn’t so familiar.
I have some sad news: Tom Hanks will not be the master of ceremonies for this show. But, I will give you a few resources with which to bring the party home. You just need to provide your own big red button and Bosom Buddy. I’m sure it will be awesome. Note: we here at CERN Love take no responsibility for what you do with this information.
LHC information
- Commission schedule and updates
- News
- Monitoring – these are the high level monitoring screens that you might see around CERN. Be sure to try all the options in the top-left pull-down menu; if you like obscure acronyms, colored indicators, and mysterious plots then you will be in heaven.
- Cryogenics history (buttons on top select a sector with more details, buttons on bottom select time frame)
- CERN on Twitter
Experiment information
The reality is that the LHC experiments won’t be pushing to the frontier of knowledge, let alone creating wormhole portals to alternate dimensions, for at least another year. For now the goal is just to test what we can of the detectors and hopefully create some dramatic renderings usings beam splash or beam halo events (hopefully updated soon).
- LHCb public web page – detector status (try Page1 or LHC status)
- Alice public web page – detector status
- ATLAS public web page with detector status and live events — web cams
- CMS public web page — web cams — twitter
Updates: removed ATLAS live event link (it seems you need a login now), added twitter links, added cryogenics link, added CMS beam splash image.
Best of CERN: the CERN Market
Nov 18th
Well, since business here at CERN seems to be heating up (and, somehow, cooling down), I must admit that my time this week is limited. But, thankfully, a poster on the CERN web-based want ads was kind enough to come to my aid in providing our mid-week entertainment. It’s not hard to find particularly interesting posts here, but, sadly, one must have a CERN computing account to view the posts first-hand. For this reason, I’ve included a captured image of this featured CERN Market post for your viewing pleasure. In short, someone at CERN has a car that (s)he is trying to pawn off onto another poor soul who finds himself wary of CERN bikes or the utterly horrendous Y bus. However, there is a catch — rather, a few catches:
To be honest, I actually considered contacting the seller to have a look. I have no daughter to worry about, so I really have no excuses. I’m mostly incredibly interested in discovering what it means for a car to tilt in the middle.
Favorite Places: Building 553
Nov 16th
Much has been made of the lofty scientific forays undertaken at CERN, and the lives of the people who embark on these adventures of fundamental research and discovery. But do not the spaces these scientists inhabit deserve their equal measure of fame? After all, it is the roofs of CERN that protect us from the elements, the walls of CERN that hide our secret ambitions from the malicious eyes of our competitors, the soaring atria of CERN that inspire our creativity, and the very bricks and mortar of CERN that greet our eyes, day after day after motherfucking day.
In a word, it is the architecture of CERN that shall be unveiled and adored today. And what better candidate than building 553.
This timeless structure was specially commissioned by the Director General’s office and designed by the firm Merde Bâtiments. We are reminded that while in principle every type of material has its proper place and function, there is still room for an element of surprise and playfulness. Shingles need not only sit atop roofs; corrugated fiberglass is allowed to keep the rain off our heads; peeling paint is paint with character, and gray is, quite simply, beautiful. Take a deep breath and let us take you on a virtual tour of building 553.
More mysteries of the water tower
Nov 13th
Speaking of water tower mysteries. What the Fermilab is this picture about?
This comes from the CERN document server which is a whole world of mysteries unto itself. There is almost no context for this image, a visual non sequitur. It gets the handy keywords ‘generalities’, ‘landscape’, and ‘nature’. From the title, View of the CERN by the water tower (Calendar 2002), it seems to be for a calendar. Really? There aren’t any cute kittens or scientists willing to pose naked? When in doubt you at least can’t go wrong with 12 months of beautiful landscapes; couldn’t the photographer have held out for a view of Mt. Blanc in the background? (It’s behind that haze.) I guess not.
I found six images on the document server for this “Calendar 2002.” There are a couple photos from the dismantling of LEP and another couple of the fire brigade in action. Good hearty CERN fare. But, finally, there is also a very creepy image of a sheep. I say creepy because, though I think the sheep has just been sheared, at first glance it looks dead or prepared for slaughter. Brilliant:
CERN, it’s where scientists do mysterious things with particles and sheep go to die.
CERN Conversations: On units
Nov 11th
From time to time, we here at CERN Love are priveleged enough to overhear some truly amazing discussions. Whether we are wandering through one of CERN’s overcrowded restaurants at the peek of lunch hour, spending 8 grueling hours on a shift, or just casually drinking a coffee in the newly-furnished atrium of lovely Building 40, we are privy to some interesting shit coming out of people’s mouths.
Today, I want to bestow upon you a gem of a dialogue I overheard last week between two not-so-intelligent physicists (with a special appearance by an intelligent physicist!):
Dumbass A : So, if you look here, you can see the output rates…
Dumbass B : …yes, I can follow that. My only question is abou–
Dumbass A : –and don’t forget the units are in [read as 'megahertz'] mHz.
Intelligent Physicist : Actually, the units printed there are millihertz.
[...the two dumbasses stare at the laptop screen, and then confusingly at one another...]
Dumbass B : Well, the ‘k’ in ‘kilohertz’ is lowercase, so…
Dumbass A : …yeah, I think it’s ‘mega.’
[Intelligent Physicist walks away, dumbfounded.]
Now, I’ll be the first to admit that CERN is a wonderfully stimulating place, with many of the world’s greatest minds, but this left me awe-struck. If there’s any confusion:
Even Wikipedia says so! The only other question is: what the hell were they discussing that could be measured in millihertz?
Mysteries of the water tower
Nov 9th
Dearest CERN Lovers,
Today I would like to share a few mysteries surrounding the CERN water tower that have confounded me for years, as well as partial explanations I’ve heard that sound plausible but may or may not be true. I am a seeker, always striving to know and to comprehend, so if you have heard other explanations, I invite you to share them.
- Why did CERN originally build a water tower?
An Explanation: to cool one of the experiments (heard this from a well-known physicist). - What is it used for today?
An Explanation: drinking water - Why was it painted yellow?
An Explanation: Because a bright yellow eyesore is better than a concrete-colored eyesore. - Why was it only partially painted yellow?
An Explanation: an Italian firm was taking so long to paint it and increasing their price as they went that CERN management got fed up and called it off before it was finished (heard this from a crazy person). - Why does a water tower need a viewing room at the top surrounded by windows?
No known explanation
Any help you can offer to resolve these mysteries would be much appreciated!
Sincerely,
Biglove
Making friends, losing conciousness
Nov 6th
I’ve got a little story about these slippers. It’s a heartwarming tale of international friendship and vomit.
When I first moved to CERN, and before I acquired a proper apartment (recall that this process can be difficult), I lived at a CERN hostel for a few months. This wasn’t one of the relatively new and very conveniently located hostels right next to Restaurant 1 and Building 40 (two hubs of activity). Instead, I lived in what we commonly called the ”French hostel” (more specifically it is the ”Saint-Genis hostel,” part of Foyer Résidence Schumann, which also provides housing to people outside CERN). It is off-site and requires a bike or shuttle bus ride to work, but it has the advantage of cheap single rooms that can be booked for long periods of time.
Life at the French hostel is pretty basic. The showers and toilets are shared, though each room is equipped with a sink. During my stay a hot water heater was broken for almost a month during which only those who leapt out of bed before sunrise got a hot morning shower. The kitchen/common area at the end of each floor was primitive. (I hope there have since been some upgrades, though I doubt it.) We had an ancient electric range that sat on the counter as a free-standing component. The microwave was a hefty industrial model of similar vintage that showed off enough metal to make the modern American homeowner proud, except that it worked only part of the time. There was a fridge with small locking sections for each resident, two tables, and some chairs. That’s about it. The space was large, but largely empty.
It seemed like quite a disproportionate number of the residents were Russian, though their hearty dinner gatherings my have unduly enhanced their visibility. One especially gregarious fellow from my floor made frequent shirtless appearances in the common area. We spoke quite a lot. He was older and had been working at CERN and other high energy experiments in Russia for quite some time. He teased me about my salad dinners, which apparently where only fit for a rabbit. My kinship with rabbits was conveyed in pantomime, with a little hopping and sniffing, as was most everything else: neither of us spoke the other’s language.
One evening my friend insisted that I join them in of their large gatherings in the kitchen. The table was filled with bread and crackers, preserved fish, some meat, and plenty to drink. Vodka had marched out from the hostel cupboards, each new bottle introduced as “the finest Russian vodka.” There was one young person who could help with translation. Up until that point in my life my most extreme drunkenness involved slipping off for a nap under the table during one of our biannual grad-school house parties. This nerd was not prepared to keep up with liquor poured 8oz at a time, but I was determined to do my duty as a gracious guest. It wasn’t long before the plate of sardines was swimming back and forth in the sloppy surf that my view of the world had become. I stumbled back to my room in search of some snacks to add to the party, but instead spent a moment on the bed before leaping to the sink and filling it with the most vile cheese-fish-crackery vomit. In my next conscious moment the kitchen was empty and the sun was about to rise.
At least a week passed before I ran into the fellow who had been translating. He greeted me simply with, “it is good to see that you are alive.” Not long after that I met my shirtless friend in the kitchen. He dragged me back to his room and dug out of his suitcase a pair of handmade slippers, the “finest Russian slippers” I’m sure. One of the best of the very meaningful gifts my CERN friends have given me.
Postscript: One day I found my Russian friends clustered around the microwave, disassembling it with a pocket knife. They poked around inside the chassis, sometimes with the power on. Eventually the roomful of scientists and technicians prescribed one wadded up piece of aluminum foil for a gap that under much safer circumstances would be bridged by a fuse. I entered just late enough that I never learned if the fuse had been blowing or the aluminum, having been previously installed, had been shifting. In any case, our intermittent microwave problems were fixed.
“I can’t. I have shifts…”
Nov 4th
You thought that it was extravagant, the life of a particle physicist at CERN. You thought that daily life in Geneva was chock full of fancy watches, lavish cars, endless mounds of fondue, and the best croissants money can buy. You thought that the work being carried out here at the lab was nothing if not the most pertinent and revolutionary. You thought, “Man, I’d give anything to work at CERN.”
Think again.
Picture this: 50 sq. meters, 60 computer screens, and the guarantee that you’ll be spending the next eight hours of your life holed up here. Tonight, you are on shift. Tonight, from 11pm until 7am, you will be devoting your time to making sure that the detector is functioning properly. Don’t get too excited about this — you won’t actually have any control. Actually, if some component of your system enters a FAIL state, there are only a few options you have before you have to call a detector expert. None of those options will work, I guarantee you. So, you’ll call the Expert. And, no, she won’t be happy to help you, now that it’s 2.17am. But, you’ll survive.
Then, around 5.27am, you’ll grow tired of nodding off at your bank of PC screens. You’ve been keeping an eye on the detector (it’s fine), keeping an eye on the data coming from the detector (it’s fine), and keeping an eye on that cute girl working a few desks away (she’s fine). But, it’s all you can do to stay awake, so you have to pull a lifeline. Coffee sounds nice, so you head to the nearest coffee shop, two floors above you. Shortly after struggling your cup free from this machine’s deathgrip, you’re well on your way to an ecstasy-laden morning. Best. Coffee. Ever.
At the end of your grueling eight hour shift, you can hardly remember why you had such adverse opinions about the job. One night of pretty boring nothingness (plus a few calls to your favorite detector experts) is hardly worth quitting over. But, then, you remember: this happens again the next night. And the next. Night shifts always come in 3′s…just like the best things in life.
In actuality, being on shift at CERN is a rather important task, and it’s a great way to contribute to the various experiments conducted on the LHC. But, I mean, come on…
Okay, it’s not the worst job; it’s second only to the job of an Expert.
If you’re still interested, and want to live alongside some other shifters, have a look at these webcams:
Also, it’s important to keep in mind that even Tom Hanks has been on shift.
Pipe in a box
Nov 2nd
Once upon a time, near the vineyards, past a parking lot, where the grass and flowers grow, at the farthest southeast corner of CERN, lived a metal box. This box sat alone and wore a hat. It was also a naughty box and had such a massive erection that a custom-made frame was required to support it. The box did not live near any buildings at all.There was nothing around the box but a few parked cars and grassy fields.
All day long, the box sat and ejaculated warm air and wet drops of some unidentified liquid out into the sunny Swiss air.
































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