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Getting Started with Atlas

This page is organized into several sections. The primary goal is to get you logged into our computers and setup the software so you will be able to analyze data as quickly as possible. The first part will be steps that you'll all need to follow to log into your account as well as general setup and useful tips for working on our cluster. This will be followed by analysis-specific instructions and links to papers, talks etc. Finally, we've included some links to more general Atlas, CERN or particle physics webpages that are either useful or interesting both.

General Recipes:

=====> CERN/real atlas/ svn accounts.

You should all have an account on the nevis computing cluster already, and this same username and password will allow you to log into the Atlas cluster, called xenia. There are ~150 processors in this cluster, but most of them are reserved for batch processing. We work interactively on two nodes: xenia.nevis.columbia.edu and xenia1.nevis.columbia.edu. You can log into them from a terminal window using the ssh command:

ssh -Y summerstudent@xenia1.nevis.columbia.edu

(use your username, not "summerstudent"). You are now logged in and should see a prompt like:

[summerstudent@xenia1]~%

To setup our environment you will need to add the following lines to your .zshrc file. You only have to do this one time. Open the .zshrc file with an editor (my favorite is emacs):

emacs .zshrc

and add these lines at the end:

export ATLAS_LOCAL_ROOT_BASE=/a/data/xenia/share/atlas/ATLASLocalRootBase/
alias setupATLAS='source ${ATLAS_LOCAL_ROOT_BASE}/user/atlasLocalSetup.sh'

I've made a script that you should run every time you log into xenia. This sets up the environment for using the atlas software. From my home area copy the file:

cp /a/home/karthur/tandeen/forSummer2011.sh .

and then

source forSummer2011.sh

We use SVN as a way to save, backup and share our analysis code. Think of it as a online library where we checkout (and eventually check in) our work. To checkout packages of code you will need to do the following:

export SVNAP=svn+ssh://summerstudent@svn.cern.ch/reps/apenson
cd /a/home/karthur/summerstudent
kinit  
svn --username summerstudent co $SVNAP/ArCondNevis 
rm  -rf Analysis 
svn -username summerstudent co $SVNAP/Analysis 

This will give you a clean version of our analysis code to start with. You might want to add that first line to your .zshrc file so you don't have to type it in everytime you want to checkout or update the code from SVN.

Specific Analysis Recipes

Excited Electrons

D0 paper link: http://arxiv.org/abs/0801.0877

Randall-Sundrum Gravitons in Dielectron and Diphoton Final States

D0 Paper link: http://arxiv.org/abs/1004.1826

Boosted W's

Maybe?

-- TimothyAndeen - 24 May 2011

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Topic revision: r1 - 2011-05-24 - TimothyAndeen
 
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