current status of lhc and atlas and prospects for 2010 - 2011 andy
TRANSCRIPT
Andy Haas - 5/21/2010 Slide 1
LHC DATA!LHC DATA!Current status of LHC and ATLAS Current status of LHC and ATLAS
and prospects for 2010 - 2011and prospects for 2010 - 2011
Andy HaasAndy HaasSLACSLAC
West Coast LHC Theory MeetingWest Coast LHC Theory MeetingSCIPP, UC Santa CruzSCIPP, UC Santa Cruz
May 21, 2010May 21, 2010
Andy Haas - 5/21/2010 Slide 2
Overview
LHC commissioning progress at 7 TeV– I'm not an accelerator physicist!
Observing from ATLAS...
ATLAS commissioning at 7 TeV
LHC plans for the rest of 2010LHC plans for 2011– (or ask the Farmers Almanac !)
My comments and conclusions
* A lot stolen from LHCC meetings:http://indico.cern.ch/conferenceDisplay.py?confId=92525
Andy Haas - 5/21/2010 Slide 3
Andy Haas - 5/21/2010 Slide 4
Andy Haas - 5/21/2010 Slide 5
Andy Haas - 5/21/2010 Slide 6
Andy Haas - 5/21/2010 Slide 7
Collision xs ~ 80 mb
Collision rate ~ 100 Hz
Record every collision to tape!
Andy Haas - 5/21/2010 Slide 8
Andy Haas - 5/21/2010 Slide 9
Squeeze
Andy Haas - 5/21/2010 Slide 10
Andy Haas - 5/21/2010 Slide 11
Collision rate ~ 1 kHz
Prescale collision trigger!
Andy Haas - 5/21/2010 Slide 12
Overview
LHC commissioning progress at 7 TeV– I'm not an accelerator physicist!
Observing from ATLAS...
ATLAS commissioning at 7 TeV
LHC plans for the rest of 2010LHC plans for 2011– (or ask the Farmers Almanac !)
My comments and conclusions
* A lot stolen from LHCC meetings:http://indico.cern.ch/conferenceDisplay.py?confId=92525
Andy Haas - 5/21/2010 Slide 13
Andy Haas - 5/21/2010 Slide 14
~1 cm!
Andy Haas - 5/21/2010 Slide 15
Andy Haas - 5/21/2010 Slide 16
Andy Haas - 5/21/2010 Slide 17
Andy Haas - 5/21/2010 Slide 18
Andy Haas - 5/21/2010 Slide 19
Andy Haas - 5/21/2010 Slide 20
Andy Haas - 5/21/2010 Slide 21
Andy Haas - 5/21/2010 Slide 22
Andy Haas - 5/21/2010 Slide 23
Andy Haas - 5/21/2010 Slide 24
Overview
LHC commissioning progress at 7 TeV– I'm not an accelerator physicist!
Observing from ATLAS...
ATLAS commissioning at 7 TeV
LHC plans for the rest of 2010LHC plans for 2011– (or ask the Farmers Almanac !)
My comments and conclusions
* A lot stolen from LHCC meetings:http://indico.cern.ch/conferenceDisplay.py?confId=92525
Andy Haas - 5/21/2010 Slide 25
Beyond the First 1/nb
In the last 2 weeks:Up to 6 filled bunches/beam
→ 3 colliding bunches/turnUp to 2e10 protons/bunch
~10/nb delivered!
Andy Haas - 5/21/2010 Slide 26
Andy Haas - 5/21/2010 Slide 27
Rest of 2010 Plan● Increase number of bunches, and slowly the bunch charge● Constraints: total current (safety), beam stability
Andy Haas - 5/21/2010 Slide 28
Rest of 2010 Plan
Bunch charge of 1e11already very stable!
Reconsider plan...
● Increase number of bunches, and slowly the bunch charge● Constraints: total current (safety), beam stability
Andy Haas - 5/21/2010 Slide 29
Andy Haas - 5/21/2010 Slide 30
A somewhat pleasant surprise
● Go to “nominal” (that means high, 1e11) bunch charge now ?!
L ~ (bi1*bi2)*nbI ~ (bi1+bi2)*nb
● If you want low I and high L, increase bi, keep nb low!Of course, there's a limit to how high you can make bi, so eventually you have to increase nb
● Just 2 colliding bunches / turn : <0.1% of bunches filled!– But big bunches !
● Upside: more luminosity in the short term (this summer)● Downside: multiple interactions, ~2 per (filled) crossing!
Andy Haas - 5/21/2010 Slide 31
As I'm writing this talk...
Andy Haas - 5/21/2010 Slide 32
Andy Haas - 5/21/2010 Slide 33
And the Farmer's Almanac...
Andy Haas - 5/21/2010 Slide 34
ConclusionsLHC is performing great at 7 TeV !Now on track, steady improvementsGood machine availability / uptime
~50/nb by the end of May– That's a Z peak
~1/pb by end of June– Start to see top
~100/pb by end of October– Discover SUSY !
~1/fb in 2011– Measure SUSY masses !
Andy Haas - 5/21/2010 Slide 35
Conclusions● ATLAS (and CMS) working as designed
– Years of delays not wasted time...– ATLAS data is well understood
after just ~6 months of data !
● Incredible data/MC agreement– Testbeam, G4, detector description– Puts pressure on accurate calculations !
● Not just “Tevatron at 3.5x the energy”– Granularity, improved particle ID– Much lower fake rates– Much larger detector acceptance– Timing, timing, timing !
Andy Haas - 5/21/2010 Slide 36
Conclusions● ATLAS (and CMS) working as designed
– Years of delays not wasted time...– ATLAS data is well understood
after just ~6 months of data !
● Incredible data/MC agreement– Testbeam, G4, detector description– Puts pressure on accurate calculations !
● Not just “Tevatron at 3.5x the energy”– Granularity, improved particle ID– Much lower fake rates– Much larger detector acceptance– Timing, timing, timing !
Thank you!
Enjoy the data!!
Andy Haas - 5/21/2010 Slide 37
Backup...
Andy Haas - 5/21/2010 Slide 38
Trigger
Andy Haas - 5/21/2010 Slide 39