most powerful solenoid magnet

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Most Powerful Solenoid Magnet 18kA, 3.8T solenoid 3m radius, 15m

length 2.5 GJ stored energy Can be discharged in

a controlled fast dump in several minutes

Tested successfully in 2006 and 2008

Effect of significant in-situ fringe fields necessitated additional securing of objects

B

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CMS Completed!August 25, 2008 – 16 years after its Letter of Intent

2

Ready for the LHC

Some issues here

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Huge Toroidal Magnet System

B

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Sept.10, 2008

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Large Hadron Collider, near Geneva, Switzerland

CERN

CMSGeneva

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A Proton Collider (“Atom smasher”)

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The Large Hadron Collider (LHC) 7 TeV on 7 TeV proton-proton collider, 27km ring

7 times higher energy than the Tevatron at Fermilab Aim for 5 TeV for 2008

100 times higher design luminosity than Tevatron (L=1034cm-2s-1)

1232 superconducting 8.4T dipole magnets @ T=1.9ºK Largest cryogenic structure, 40 ktons of mass to cool

4 experiments ATLAS, CMS ALICE, LHCb

Start Date:Sept. 10,2008

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Uniform Circular motion

7 TeV8 T

3 km

prqB

pBr

B

v

r

Actually about 4.5km with straight sections included

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LHC Tunnel and Dipole Magnets

15 m long magnets with unique single structure for 2 beams

Cooled with superfluid helium

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The Real Tunnel

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The Excitement of First LHC beams!

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Beam Splash Event

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UF Celebration in the CMS Control Room, 11pm

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Unfortunately… An major malfunction on Sept.19, 2008 means that

we’ll be restarting once again in Sept. 2009

Electrical arc vaporized beam pipe, released tons of helium, leading to chain reaction of forces…

Some Misconceptions about the LHC

Geneva tabloid

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The LHC will create mini-black holes that will destroy the Earth

If more dimensions exist to allow their production, Hawking radiation will cause them to decay immediately

Collisions at energies above the LHC have occurred in our atmosphere over eons, so any BHs that are stable have been benign

See also: J. Ellis et al., “Review of the safety of LHC collisions”,J. Phys. G: Nucl. Part. Phys. 35 (2008) 115004

Doomsday scenarios…

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This is a work of fiction

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http://cern.ch

But the CERN laboratory has been very supportive of the upcoming movie (and offering clarifications…)