what happens at cern? roger barlow manchester university
Post on 18-Dec-2015
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What happens at CERN?
Roger Barlow
Manchester University
The smaller the detail
The bigger the apparatus
Letters
~1/5 mm
Details of print
~1/50 mmIndividual paper fibres ~1/500 mm
The World’s biggest Microscope
CERN
A co-operative European effort – sharing costs between many countries
Digging out a cavern
The final pillar
Tunnel – completed
LHC
A machine for colliding protons at very high energies
v=0.99999998 c
What happens?
• Protons collide with other protons
• Energies high enough to make new particles
• Particles stream out of the collision and analysed by detectors
• Results are recorded electronically and stored on disk for later analysis
The ATLAS detector
ATLAS in reality
Part of another detector (OPAL)
The DELPHI detector
What we see
Proton hits proton and makes lots of stuff
Towards the New Periodic Table(?)
So finally
• Particle Physics is still a live subject. New discoveries are made. Textbooks go out of date. We understand things better.
• CERN is where it’s happening. For Europe and the world
• CERN is important for physicists and for taxpayers
• Visiting CERN is a great experience.
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