LHC News

Mike Hewson
Mike Hewson
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RE: I reckon Mike will be

Message 95040 in response to message 95033

Quote:
I reckon Mike will be in Hog's Heaven .....


Snort, snuffle, grunt. :-)

As for the two way circulation, plus collisions, what a job! Similar to LIGO, it can be hard to appreciate the degree of precision, and the number of correct preconditions, required to achieve this.

Cheers, Mike.

I have made this letter longer than usual because I lack the time to make it shorter. Blaise Pascal

Ver Greeneyes
Ver Greeneyes
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More good stuff :)

Message 95041 in response to message 95040
Mike Hewson
Mike Hewson
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RE: More good stuff :)

Message 95042 in response to message 95041

Quote:
More good stuff :)


There's also a good article on quench protection, which includes highly radiation hardened sensors to pick up very, very tiny deviations from the superconducting state ( one nano ohm !! ). The magnet currents are then dumped into 'special' resistors. 'Special' is a definite understatement as the energy to quench, per sector, is equivalent to the kinetic energy of a cruising passenger jet! They have also put in UPS's ..... :-)

Cheers, Mike.

( edit ) In a given magnet circuit : up to ~ 8000 amps needs to quench in under one second. Several resistors are used to quench, at least three 50kg lumps of copper ( of 50cm diameter in cross-section ) in series, with each of these soaking up ~ 2 GigaJoules !! During which time a resistor heats up by ~ 100 degrees Kelvin !! Now that'll quickly boil the kettle. It's worthy to compare this with a typical lightning strike of over 20K amps that also lasts about the same time. Thus LHC has to quench lightning !!

I have made this letter longer than usual because I lack the time to make it shorter. Blaise Pascal

tullio
tullio
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The beast is alive:LHC Tullio

The beast is alive:
LHC
Tullio

MAGIC Quantum Mechanic
MAGIC Quantum M...
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tullio
tullio
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It seems LHC has suffered

It seems LHC has suffered another blackout, with no damages:
Blackout
Tullio

Rod
Rod
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Higgs Boson for Sale..

Higgs Boson for Sale..

There are some who can live without wild things and some who cannot. - Aldo Leopold

Rod
Rod
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The injunction against the

The injunction against the end of the world

An interesting read from a lawyers perspective

There are some who can live without wild things and some who cannot. - Aldo Leopold

Michael Karlinsky
Michael Karlinsky
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tullio
tullio
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It looks like the LHC is

It looks like the LHC is bound to problems related to connecting cables with a soldering iron. See this "Nature" article which points to a paper written by one of the builders of LHC:
Soldering the LHC
Maybe the nuclear and subnuclear physicists of CERN have underestimated a problem in soldering cables, which should have been done with a proper solder alloy.
Tullio

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