Knocking on the LHC’s door

Thanks to a huge collaborative effort the final commissioning of the transfer line TI8 has been successful. There was both excitement and relief as, after some unforeseen delays, the beam burst onto the monitors in the Control Room on Saturday 24th May. Although the beam is less intense (at around 5 thousand million protons per bunch) than will eventually be used in the LHC, this test represents an important milestone in the run-up to the switch-on of the accelerator.

http://www.lhcountdown.com/?p=13

不知道什麼原因，有人知道嗎？