The failure was caused by an electrical arc that punctured an enclosure holding the liquid helium used to keep the collider cold, said a CERN statement.

• 欧洲核子研究中心的一份陈述报告说，故障是由于一个电弧所引起的，它击穿了保持液态氦的围封设施，液态氦用来保持对撞机处于低温。