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<p><strong>The fault that has shut down the Large Hadron Collider (LHC) will be hugely disappointing for scientists and engineers following the successful "start-up" of the experiment.</strong> </p><p>It is now over a week since the first beams were fired around the accelerator's 27km (16.7 miles) underground ring. The crucial next step is to collide those beams head on. </p><p>But hopes that the first trial collisions would be carried out before the machine's official inauguration on 21 October now seem to have been dashed. It even looks uncertain whether this can be achieved before 2009. </p><p>-----------------------------------------------------------------------------------------------------------------</p><p>What was the problem and how long to it is up and running?</p><p> </p><p>http://news.bbc.co.uk/2/hi/science/nature/7627631.stm</p><p> </p><p> </p><p> </p><p> </p><p> </p> <div class="Discussion_UserSignature"> </div>