According to John Conway, the decision coming out of Chamonix is to go with the first of the two scenarios described here: stay at 3.5 TeV/beam, then a long shutdown to fix all the splices. The idea is to run at 3.5 TeV during 2010 and 2011, stopping for shutdown either when 1 fb-1 has been accumulated, or end of 2011, whichever comes first. The LHC will thus be off throughout 2012, coming back in 2013 for a run at or near the design energy of 7 TeV/beam.
With the Tevatron counting on having around 12 fb-1 of data at 1 TeV/beam by October 2011, it should remain competitive with the LHC for many sorts of searches, including the search for the Higgs, for much longer than expected. This should be true for more than 3 years from now, until after the LHC has accumulated a significant amount of data at full energy in 2013. The current planning is for Tevatron operation only through FY2011, I wonder whether this will change…
Update: Science has a story from Adrian Cho here. The D0 co-spokesperson says the decision on running the Tevatron in 2012 “won’t have to be made for several months.” CERN experimenters are quoted as saying that they will still be searching for supersymmetry and extra dimensions. I haven’t seen any studies of exactly what 1 fb-1 at 7 TeV will make possible in terms of doing better than Tevatron limits on such processes and on the Higgs.
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