According to an 8 February 2002 article by Charles Seife on pages 942 and 943 of Science:
... the Tevatron is scheduled to have 2 inverse femtobarns (fb^(-1)) of integrated luminosity by the end of 2004 and, after a change in configuration, 15 fb^(-1) by the end of its run in 2008.
Since March 2001, however, the accelerator has produced only 0.02 fb^(-1). ...
... the severity of the problems is worrisome ... under certain conditions some of the magnets that accelerate and guide the protons and antiprotons have tended to "quench": the superconductor in the magnet has been heating up and losing its superconducting ability. ...
... the machine loses 70% of its antiprotons as it moves them from the accumulator ... into the main injector ... It also loses 20% of the particles while transferring them from the main injector to the main ring of the Tevatron ... The losses seem to indicate that the particles take on a wider-than-expected range of speeds, which effectively makes the beam wider than the pipe it is supposed to travel through.
In addition, the protons and antiprotons ... affect each other more than is healthy, causing the beam to spread. ...
... says Daniel Froidevaux, a physicist at CERN ... "For the top quark, an integrated luminosity of a few hundred inverse femtobarns [sic - What he probably said was "a few hundred inverse picobarns", as an inverse femtobarn (fb^(-1)) is a thousand inverse picobarns. ] is not sufficient. They need to meet the 2 fb^(-1) target." ...".
According to an article by Geoff Brumfiel in Nature 424 (03 July 2003) 3:
"... Physicists at the Tevatron particle accelerator ... at the Fermi National Accelerator Laboratory (Fermilab) ... have now cut their estimate of the number of proton-antiproton collisions they expect to see by 2008 by 60-80% ... problems have arisen with the equipment used to accelerate the protons and antiprotons. The Tevatron is 20 years old and its accelerators have been plagued by trouble during 'Run II', an upgraded second phase of operation that began in 2001. The news is forcing Michael Witherell, Fermilab's director, to reconsider funding for Run II, which consumes nearly two-thirds of the lab's $300-million annual budget. ... Witherell says he may have to withhold $25 million needed to replace the detectors' silicon wafers, which create electrical signals when hit by particles. Researchers warn that this could severely impair the detectors' performance. ... Witherell puts the chance of spotting the Higgs at "something like 50%". Others disagree: "I don't think there's any chance they will find it," says CERN physicist Daniel Froidevaux. ...".
......