Search found 160 matches
- Thu May 26, 2011 8:12 pm
- Forum: The Accelerator
- Topic: The cost of days without runs
- Replies: 5
- Views: 9364
Re: The cost of days without runs
Hard to guess... It is direct cost due to the repairs or indirect cost due to the inactivity? Inactivity mainly, but also having to spend money on people's time bringing the system back to where it was. During inactivity, people can manage their work to compensate, whereas the cost of people's time...
- Wed May 25, 2011 11:35 pm
- Forum: The Accelerator
- Topic: The cost of days without runs
- Replies: 5
- Views: 9364
The cost of days without runs
Today, there's a communication problem with the cryogenics whcih means there's no beam for 1 1/2 days. I don't think this would have happened if they had doubled up with a backup, but only if it was economically feasible to do this on the least reliable and least espensive parts. So does anyone know...
- Mon May 23, 2011 12:02 pm
- Forum: The Accelerator
- Topic: Questions on the LHC display dashboard
- Replies: 2
- Views: 7939
Questions on the LHC display dashboard
Where can I get an explanation of what the various displays on the LHC dashboard mean?
http://lhcdashboard.web.cern.ch/lhcdashboard
On fill 1803, the beam size becomes erratic every half an hour. What's going on?
http://lhcdashboard.web.cern.ch/lhcdashboard
On fill 1803, the beam size becomes erratic every half an hour. What's going on?
- Thu May 19, 2011 11:40 am
- Forum: The Accelerator
- Topic: 108b injection scheme
- Replies: 2
- Views: 5529
108b injection scheme
Will the 108b injection scheme be used for all further luminosity increases from now on, or are there other schemes which need to be used?
- Tue May 17, 2011 3:22 pm
- Forum: The Accelerator
- Topic: 2011 Events Discussion
- Replies: 184
- Views: 259739
Re: 2011 Events Discussion
Physics runs are back after the technical stop. They are now running with 228 bunches and will step up through 480 and 768 bunches to get back to previous luminosities. After two more good fills with 768 bunches they can move up to 912 bunches, but that will require a new injection setup for 108 bu...
- Sun May 15, 2011 7:54 pm
- Forum: The Accelerator
- Topic: The cryogenics at the LHC
- Replies: 2
- Views: 6819
Re: The cryogenics at the LHC
Over the past few weeks I've noticed that they might lose between 1/2-1 days on the cyrogenics failing. How good are the cryogenics at the LHC compared to the Tevatron? What are the problems with cryogenics upto now and how difficult have they been to fix? Which part of the tunnel is the least acce...
- Sat May 14, 2011 10:31 am
- Forum: The Accelerator
- Topic: The cryogenics at the LHC
- Replies: 2
- Views: 6819
The cryogenics at the LHC
Over the past few weeks I've noticed that they might lose between 1/2-1 days on the cyrogenics failing. How good are the cryogenics at the LHC compared to the Tevatron? What are the problems with cryogenics upto now and how difficult have they been to fix? Which part of the tunnel is the least acces...
- Thu May 12, 2011 11:50 pm
- Forum: The Accelerator
- Topic: Improved performance after MD and TS?
- Replies: 11
- Views: 15445
Re: Improved performance after MD and TS?
If the question is about performance perhaps it should have been about any premature end to a fill, not just quenches. Yes, I'm interested in the causes for a fill to be abandoned and the beam having to be dumped/quenched. Quenched and dumpled are the same thing, correct? If you look at slide 15 in...
- Wed May 11, 2011 12:27 am
- Forum: The Accelerator
- Topic: Improved performance after MD and TS?
- Replies: 11
- Views: 15445
Re: Improved performance after MD and TS?
Is that enough detail?? Hey, thanks for the useful info. At the Tevatron, they've managed to limit 1 quench to around 20 fills. Do you know what the figure is for the LHC and if they have a realistic chance of reducing it? They were also managing to get remarkable fill times of 70% so I'm curious t...
- Sun May 08, 2011 3:12 pm
- Forum: The Accelerator
- Topic: Improved performance after MD and TS?
- Replies: 11
- Views: 15445
Improved performance after MD and TS?
This coming Sat, the LHC will be back in fills for physics, so afer the technical stop and machine development phase should be expect any improvement in the performance of the machine? I've also noticed that the plan was to get to 900 bunches with 75ns, whereas they were using 50ns so will they stop...