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Starting up such a machine is not as simple as flipping a switch. Commissioning is a long process that starts with the cooling down of each of the machine’s eight sectors. This is followed by the electrical testing of the 1600
The synchronization of the LHC's clockwise beam transfer system and the rest of CERN's accelerator chain was successfully achieved last weekend. Tests began on Friday 8 August when a single bunch of a few particles was taken down the transfer line from the SPS accelerator to the LHC. After a period of optimization, one bunch was kicked up from the transfer line into the LHC beam pipe and steered about 3 kilometres around the LHC itself on the first attempt. On Saturday, the test was repeated several times to optimize the transfer before the operations group handed the machine back for hardware commissioning to resume on Sunday. The anti-clockwise synchronization systems will be tested over the weekend of 22 August.
Originally posted by Sandia-1985
THAT GIVES YOU SERIOUS RESPONSIBILITIES WOW
Magnet for European particle accelerator self-destructs with a 'bang and a cloud of dust'
The Associated Press
Tucson, Arizona | Published: 04.04.2007
GENEVA — A 43-foot-long magnet for the world's largest particle collider broke "with a loud bang and a cloud of dust" during a high-pressure test, and officials said Tuesday they are working to find a replacement part.
Injection test - approximate schedule
Time Phase Resp Approx elapsed time
Friday pm Access system - Beam ON
Friday pm Final prep of TI2 and EIS Rossano 1 hour
Friday 16:00 Final Interlock tests Bruno/Ben 1 hour
Friday 15:20 Beam on to TI2 TED
MSI etc pulsing
Cycle LHC Sector 23
OP 1 hour checks - trajectory etc. Beam down TI2 first shot
Friday 19:00 TI2 TED out, beam to TDI, kickers off
Give Alice 20 minute warning before taking TED out
INJ 2 hours Beam on TDI after correction end TI2
Friday 21:00 Kickers on, time in, position checks
Resolve timing issues
INJ 2 hours Interesting collaboration between timing and RF
Friday 21:40 TDI out - threading - momentum matching - beam to IR3 - beer Jorg & team 3 hours Beam to IR3 first shot. Tweak SPS.
Over night Fri-Sat Kick-response measurements Jorg & team 8 hours Beam induced quench of RB.A8.L3 at 02:19
Access required to replace quench heater power supply (not related to above quench)
Saturday am Access point 3 & Alice
15:00-17:00 Steering , RF, BI - beam to IR3 15:00 Beam back to IR3
17:00 - 20:00 Injection region aperture checks - TDI in Bren & team 4 hours TDI in 16:55 - Aperture checks half done
19:13 Injection kickers - fault off - system reset required - no beam for 2 hours+ 22:05 beam back
22:00 Kick-response measurements revisited
IR3 - open collimators - check down stream optics - close collimators afterwards.
Beam trhough IR3 nor problems. Instrumentation & optics look good.
Jorg, Massimo, Stefano 23:05 Beam through IR3
22:00 - 07:00 Gentle aperture measurements
Very nice set of measurements taken over night.
Stefano 8 hours
09:00 - 14:00 Dispersion plus RF
13:55 - dispersion measurement OK
OP Andy and Philippe Lots of fun with RF system, crashing counters
and stuff - sorting essential problems
14:00 ish Sunday Polarity checks etc
(Injection screen measurements in parasitic mode - OK)
Frank 3 hours Tested BPM response with lower intensity from PS
1 10^9 - not triggered
1.1 10^9 - triggered but noise
2 10^9 - looks good - Rhodri having a closed look
16:00 - finish aperture checks of injecton region
- injection kicker delay scan & trajectory
TDI in Brennan & co 3 hours Ok
Re-cycle - reset followed by problem with quench heater, injection kickers
Sun night Beam through IR3, BLM response IR3, re- check optics Bernd & co
Stefano & co
4 hours
06:00 End test
08:00 Start radiation survey, establish zones (areas which have seen beam) RP 4-6 hours
Originally posted by Tentickles
Timesonline Article
Failure of magnets
On March 27, 2007, a magnet designed and built by Fermilab for CERN's Large Hadron Collider suffered a catastrophic failure. The 14-meter long quadrupole magnet broke after supports that held the magnet in place inside a cylinder of liquid helium snapped.[10] The solution to this failure was developed within 3 months. Full current of 11.4 kilo-amps was achieved in one of these repaired magnets on April 24, 2008[11].
Originally posted by trusername
Is this thing in CERN a circle or a figure 8?
Even Dr. Lyn Evans, who heads the accelerator project at CERN, said the explosion had been potentially very dangerous. "There was a hell of a bang, the tunnel housing the machine filled with helium and dust and we had to call in the fire brigade to evacuate the place," he said. "The people working on the test were frightened to death but they were all in a safe place so no-one was hurt."
Originally posted by captiva
Interesting take on the LHC, but no more interesting than all the other prophecies that have been doing the circuit over the last 2 years. What Im more interested in are the dark daylight symptoms that are cropping up. Ive got a theory on that, but thats a diffirent thread.
As far as posters saying nothing will happen to the LHC or happen because of it, I dont think we are able to say that with any conviction. Fact is we are bordering on the totally new here. Throughout history great strides have been made due to experimenting in totally new fields or pushing ideas to their limits with the help of new equipment. Alas there have been many set-backs during the progress and Im sure the LHC wont be any diffirent. The unknown factor with the LHC is that an error could be the costliest ever known to man.
Lets here it for a brave new era thanks to the information gathered by the LHC, but lets not be too quick to say its harmless and nothing will go wrong.
[edit on 12-8-2008 by captiva]
Originally posted by BlasteR
One possibility for the dark sky phenomenon could be the black auroras
Originally posted by zorgon
Originally posted by BlasteR
One possibility for the dark sky phenomenon could be the black auroras
Links please
Originally posted by BlasteR
I talked about the black auroras in a little more detail in a previous post with lots of links and info.
The main premise behind putting all that money into a giant laser is, primarily, nuclear research.