2011 Events Discussion
Posted: Sat Feb 12, 2011 10:15 am
The cryogenics page now indicates green status for all sectors while the coordination page indicates hardware commissioning and machine checkout are in progress until 21st Feb when we expect first beams for 2011, oh it just changed to "Prepare LHC for beam" with more details for next week: http://op-webtools.web.cern.ch/op-webto ... r=LHCCOORD
There was a summary session on 9th Feb following the Chamonix workshop that descirbes how they intend to proceed see http://indico.cern.ch/getFile.py/access ... fId=126218
As we all now know they will stick with 3.5TeV this year but they also say "Thermal amplifier to be developped during 2011 to allow measurements during Christmas shutdown for a deterministic decision on a possible energy increase for 2012."
Bunch spacing for physics is expected to be 75ns compared to 150ns last year. They will use 50ns for scrubbing runs to try and remove the UFOs and e-clouds. If that works really well they may even use 50ns for physics later. Beta* for the squeeze could go down to 1.5m compared with last years 3.5m. That seems ambitious given that they are sticking at 3.5TeV which makes the squeeze harder. These changes imply an improvement in luminosity by a factor of 7 maximum. Realistically they want to get back to last years record of 0.2/nb/s as quickly as possible and then build up slowly to 1.0/nb/s. They hope for 124 days of high luminosity. If they can run at 30% efficiency for those days with 1.0/nb/s they will collect 3/fb during 2011. The official target remains at 1/fb but 3/fb is not unrealistic. Observation of new physics is quite possible but not guaranteed with this much data. A similar amount collected during 2012 should be enough to get some indication of where Higgs lives.
CERN has a new blog at quantum diaries: http://www.quantumdiaries.org/author/cern/
Other best blogs to follow for LHC news are:
viXra Log: http://blog.vixra.org/
the reference frame: http://motls.blogspot.com/
US LHC: http://www.uslhc.us/
Quantum Diaries Survivor: http://www.science20.com/quantum_diaries_survivor
Resonaaces: http://resonaances.blogspot.com/
Not to mention this forum and of course there are lots of useful links on The Portal.
There was a summary session on 9th Feb following the Chamonix workshop that descirbes how they intend to proceed see http://indico.cern.ch/getFile.py/access ... fId=126218
As we all now know they will stick with 3.5TeV this year but they also say "Thermal amplifier to be developped during 2011 to allow measurements during Christmas shutdown for a deterministic decision on a possible energy increase for 2012."
Bunch spacing for physics is expected to be 75ns compared to 150ns last year. They will use 50ns for scrubbing runs to try and remove the UFOs and e-clouds. If that works really well they may even use 50ns for physics later. Beta* for the squeeze could go down to 1.5m compared with last years 3.5m. That seems ambitious given that they are sticking at 3.5TeV which makes the squeeze harder. These changes imply an improvement in luminosity by a factor of 7 maximum. Realistically they want to get back to last years record of 0.2/nb/s as quickly as possible and then build up slowly to 1.0/nb/s. They hope for 124 days of high luminosity. If they can run at 30% efficiency for those days with 1.0/nb/s they will collect 3/fb during 2011. The official target remains at 1/fb but 3/fb is not unrealistic. Observation of new physics is quite possible but not guaranteed with this much data. A similar amount collected during 2012 should be enough to get some indication of where Higgs lives.
CERN has a new blog at quantum diaries: http://www.quantumdiaries.org/author/cern/
Other best blogs to follow for LHC news are:
viXra Log: http://blog.vixra.org/
the reference frame: http://motls.blogspot.com/
US LHC: http://www.uslhc.us/
Quantum Diaries Survivor: http://www.science20.com/quantum_diaries_survivor
Resonaaces: http://resonaances.blogspot.com/
Not to mention this forum and of course there are lots of useful links on The Portal.