02-cmsdetector.md

title	teaching	exercises	questions	objectives	keypoints
The CMS detector	20	0	What are the main components of the CMS detector?	Learn the very basic principles of CMS subdetectors and the technologies they use for sensing particles.	The CMS detector is a complex machine with multiple subsystems and technologies dedicated to identify/build physics objects.

Subdetectors and their technologies

Physics objects are built with the information collected from the sensors of the CMS detector. Take a look at the CMS experiment in the image below. In this video you will get a quick feeling of how it looked back in 2018, the last year of data taking in Run 2.

Please read this short description of the CMS experiment and answer the questions below in our assignment form. Do not be afraid of exploring the details of each subdetector in the dedicated links that appear therein. They are very short.

Question #1: What is the heaviest component of the CMS Experiment?

Question #2: Where can muon tracks be measured in the CMS detector?

Question #3: According to this CMS detector summary, around how many crystals can be found in the barrel section of the ECAL subdetector?

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