Search found 67 matches

by pcatom
Sat Dec 12, 2009 5:00 pm
Forum: The Accelerator
Topic: What is a "Piquet"
Replies: 7
Views: 5165

Re: What is a "Piquet"

Piquet is a french term - it means a standby service. For many systems there is a piquet service in place where people take it in turns to be on-call in case of need - breakdowns etc. This is not usually staffed by the system experts since the piquet service may cover many pieces of equipment in sev...
by pcatom
Tue Dec 08, 2009 12:21 pm
Forum: The Accelerator
Topic: 30,000 AMPS, WOW!
Replies: 11
Views: 7343

Re: 30,000 AMPS, WOW!

The Alice soleniod works at room temperature. I can't remember the exact figure, but the voltage is around 130V. This means an electrical power of 4MW. It is indeed an impressive magnet. It was built for the previous detector L3 which was installed in the LEP machine. For your information the it wei...
by pcatom
Tue Dec 08, 2009 7:02 am
Forum: The Accelerator
Topic: Beam Xover questions
Replies: 11
Views: 5825

Re: Beam Xover questions

In the arcs of the LHC the beams run in separate vacuum pipes spaced by 194mm horizontally. Around each experiment there are long straight sections each around 500m long. In these regions there are special dipole magnets at either side of the experiment which steer the two beams into a single pipe (...
by pcatom
Fri Dec 04, 2009 9:07 pm
Forum: The Accelerator
Topic: What exactly is pre-cycling?
Replies: 6
Views: 5167

Re: What exactly is pre-cycling?

A pre-cycle is a standard magnetic cycle that the whole machine is put through without beam in order to (re-)establish the magnetic history. It is used to increase the reproducibility of the machine settings.
by pcatom
Wed Dec 02, 2009 7:16 am
Forum: The Accelerator
Topic: 12/2/09 power loss and many systems down
Replies: 25
Views: 16627

Re: *** MAJOR power loss and many systems down

There was a fault on an 18kV circuit breaker close to point 1 which caused a power cut on the Meyrin site. The power cut affected the main computer centre and switched off the pre-injector machines (linac, PSB,PS). LHC an SPS were not seriously affected. The electrical network has been reconfigured ...
by pcatom
Tue Dec 01, 2009 9:24 pm
Forum: The Accelerator
Topic: Old Breaking news 11/30-12/2/09
Replies: 20
Views: 13769

Re: *** Breaking news ***

The other machines in the injector chain (Linac2, PSB,PS and SPS) are pulsed machines - that is they execute a repetitive set of cycles of injection, acceleration and extraction of various beams to several different users. However, at the moment the complex is running principally for the LHC - most ...
by pcatom
Fri Nov 27, 2009 8:56 pm
Forum: Portal link and forum suggestions
Topic: Portal links changes 11/25/09
Replies: 13
Views: 6033

Re: Portal links changes

Page 1 is dynamically configured depending on the mode of the machine so the information available will vary. Here are a few definitions to be going along with: TI 2 - is the transfer line between the SPS and the LHC for the clockwise beam. It is 2943m long. TI 8 - is the anticlockwise transfer line...