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Re: [Phys-l] Update on CERN (LHC)



In a message dated 12/1/2010 12:31:48 PM Eastern Standard Time,
lcrowell@SWCP.COM writes:

-----Original Message-----
From: Atoms and the Void [mailto:AVOID-L@lists.hawaii.edu] On Behalf Of
Bob Zannelli
Sent: Wednesday, December 01, 2010 9:46 AM
To: AVOID-L@lists.hawaii.edu
Subject: Re: [Phys-l] Update on CERN (LHC)
In a message dated 12/1/2010 11:19:36 AM Eastern Standard Time,
caviness@southern.edu writes:
Bob,

Where do your figures & dates come from? The magnetic quench accident is
pretty old news (<2 yrs ago), and it is my impression that the damage
repair and refurbishment has already occurred, and that the LHC has been up and
running for the past year, almost immediately breaking the previous record
for high energy collisions, and ramping up to 7 TeV (3.5 TeV per beam) last
March. The news bulletins on http://public.web.cern.ch/public/ sound
like they're having fun doing new physics, in never-before studied conditions.
Pretty upbeat, I'd say.

All the best,

Ken Caviness
Ken my source is Ian Sample's book "Massive, The Missing Particle That
Sparked the Greatest Hunt in Science" Page 212,213.
Begin Quote.
"The CERN management decided it was two risky to run the machine at full
power, so for two years it will operate at only half of its capability,
meaning that the each of the accelerator beams will be whipped up an energy of
3.5Tev before they are steered into collisions in the detectors. Near the
end of 2011, the collider will close for twelve to eight months to give
engineers time to do repairs and install a safety system. The safety measures
will protect the machine from damage should things go awry at higher
energies and only once this work has been done will the LHC run at full power."
"The decision to operate the LHC at half its design energy was not made
easily, but CERN could not afford another crippling accident like the one
that shut down the machine for a year in 2008. No collisions means no data,
which is frustrating for physics and devastating for up-and coming students
trying to earn their Ph.D.s. But the decision has consequences. Many
physicists concede that that the machine may not make a concrete Higgs discovery
before 2015."
End Quote.
Bob Zannelli
The LHC is running at half power or 7TeV/nucleon. It is currently doing
Pb-Pb collisions with the ALICE detector taking data. Tomorrow there will
be a webcast on the initial heavy ion collision data:
_http://webcast.cern.ch/live.py?channel=Channel+1_
(http://webcast.cern.ch/live.py?channel=Channel+1)
The LHC is slated to hit full steam within a year.
LC

Lawrence what's your source that CERN will be at full beam power within a
year? Have they decided to forgo installation of the new safety systems?

Bob Zannelli