Page 1 of 2

Watching collisions

Posted: Thu Apr 01, 2010 6:12 am
by Xymox
How to see what the LHC is doing..

First check Page 1 and see if the LHC has beams running in the machine..
Look for -ALL- green boxes in the lower right of the page 1 display.
http://op-webtools.web.cern.ch/op-webto ... p?usr=LHC1

A typical day squeezed down into a few minutes for a example of what happens.. Stable Beams is when collisions happen.
http://home.halifax.rwth-aachen.de/~mrongen/movie.html

Then if there are beams and they have been set to collide then you can watch the event displays show a live random snapshot of some of the events. There are WAY more then this display shows. They occur continuously for hours at rates as high as 100 per second of interesting events worth saving and looking at.

live collisions:

LHCb http://libris.nornagon.net/jca/lhc.htm

ATLAS http://atlantis.cern.ch/live/

ALICE http://alice-logbook.cern.ch/aliceOnlin ... nline.html

We dont yet know if CMS will have a live events page

Re: Watching collisions

Posted: Thu Apr 01, 2010 7:34 am
by CharmQuark
It pleases me that we have ATLAS :dance:

Re: Watching collisions

Posted: Thu Apr 01, 2010 1:52 pm
by Disco Legend Zeke
Can someone please post a page with an explanation of the color codes used in the ATLAS collision images?

I am sure it's somewhare, but i haven't found it.

THANKS!

Re: Watching collisions

Posted: Fri Apr 02, 2010 10:50 pm
by Harbles
Disco Legend Zeke wrote:Can someone please post a page with an explanation of the color codes used in the ATLAS collision images?

I am sure it's somewhare, but i haven't found it.

THANKS!
Yo Zeke! Knock yourself out. http://www.symmetrymagazine.org/breakin ... y-decoded/
And http://www.symmetrymagazine.org/breakin ... y-decoded/
Also http://www.symmetrymagazine.org/breakin ... 94decoded/

Ur Welcome lol :geek:

Re: Watching collisions

Posted: Sun Apr 04, 2010 8:40 pm
by stevegray
http://cmsdoc.cern.ch/cmscc/cmstv/cmstv.jsp?channel=4
There is more stuff on higher channel numbers.
...Well I liked it.

Re: Watching collisions

Posted: Mon Apr 05, 2010 10:48 am
by Xymox
They have added channel 12 and 13 now too..

http://cmsdoc.cern.ch/cmscc/cmstv/cmstv.jsp?channel=12
http://cmsdoc.cern.ch/cmscc/cmstv/cmstv.jsp?channel=13

the ones above that seem blank tho like 14

Re: Watching collisions

Posted: Sat May 01, 2010 12:46 am
by CharmQuark
anna_lyn00 welcome to the happy place :thumbup:

Hope you enjoy ya stay with us :D

Re: Watching collisions

Posted: Wed Jul 14, 2010 7:30 pm
by Harbles
Another article from Symmetry Magazine on decoding event displays. May be a repeat but has a lot of info grouped together in one post.
LHC Decoded.
http://www.symmetrymagazine.org/cms/?pid=1000816

Re: Watching collisions (colored jets coding ?)

Posted: Sun Aug 08, 2010 9:42 am
by 7holography
Thanks for these useful links and explanation

but still no information about the color code used
in the Atlas live event display page
(except for dimuons red lines
and gray lines they say not useful for research)

what about the yellow ,orange, indigo,blue, green and so curved lines ?

thanks in advance if anyone know

Pierre

:happy-bouncymulticolor: :happy-bouncymagenta: :happy-bouncygreen: :happy-bouncycyan: :happy-bouncyblue: :happy-bouncyred:

Re: Watching collisions

Posted: Sat Aug 14, 2010 4:35 pm
by NThorpe
Hi Pierre,

I'm almost sorry to tell you this, but the colours of the tracks used in the Atlantis event displays don't mean anything. Colours don't correspond to different types of particles. Track 1 gets the first colour in the palette, track 2 gets the next one, and so on. They're only coloured so that you can distinguish tracks.

-Nigel

Re: Watching collisions

Posted: Sat Aug 14, 2010 8:11 pm
by Eric
In the automatically generated displays the color of the tracks has no meaning indeed. This type of coloring is usually used to show the relation between hits and tracks in the detector. The tracks are colored randomly and the hits are shown in the color of the corresponding track.

The hand-picked events often use different colors to emphasize certain features of the event. For example the two muon tracks that were drawn in red. For these events there is no standard color scheme. It is usually just the preference of the person making the picture.

Gray tracks are a different story. Just as a group of hits in the detector can form a track, a group of tracks can form a jet. To show the relation between jets and tracks, you can do the same thing as before: you color the jets randomly and assign tracks the same color as the corresponding jet. If in this situation a track does not have corresponding jet, it will turn gray.

Re: Watching collisions

Posted: Fri Oct 08, 2010 9:52 pm
by fwyzard
Hi,
I don't know if these are "officially" public, but you can access the CMS event display in ~ realtime at these links:

3D view: http://cmsonline.cern.ch/iSpy/iSpy.png
other views: http://cmsonline.cern.ch/evtdisp/fireworks_hlt_p5.png

.A

Re: Watching collisions

Posted: Tue Feb 15, 2011 10:16 pm
by OrangeAndBlue
Harbles wrote:Another article from Symmetry Magazine on decoding event displays. May be a repeat but has a lot of info grouped together in one post.
LHC Decoded.
http://www.symmetrymagazine.org/cms/?pid=4396508
Symmetry Mag is a perfect place for a beginner like me to start in trying to decipher some of the ways people are coding the events of the LHC. I do not have a total grasp on the codes at hand, but I feel like I am making progress which is a good thing :D

Re: Watching collisions

Posted: Fri Feb 18, 2011 10:06 pm
by CharmQuark
Stop spamming OrangeAndBlue :thumbup:

Atlas Live Event display

Posted: Wed Mar 23, 2011 9:02 am
by 7holography
Hye,

Any chance to see the Atlas Live Event display turned on ?