YouTube - Large Hadron Collider - The Search For The Higgs [2 of 3]

Alberto di Bene dibene at
Thu Jul 30 16:47:44 CDT 2009

The attached picture was taken by me last February at the CMS (Compact Muon Solenoid) experiment
(one of the main three for the LHC) at CERN in Geneva..

News on the reactivation of the beams are not so good... read here

The foreseen shutdown work on the LHC is proceeding well, including the powering tests with the new quench protection 
system. However, during the past week vacuum leaks have been found in two "cold" sectors of the LHC. The leaks were 
found in sectors 8-1 and 2-3 while they were being prepared for the electrical tests on the copper stabilizers at around 
80 K. In both cases the leak is at one end of the sector, where the electrical feedbox, DFBA, joins Q7, the final magnet 
in the sector.

Unfortunately, the repair necessitates a partial warm-up of both sectors. This involves the end sub-sector being warmed 
to room temperature, while the adjacent sub-sector "floats” in temperature and the remainder of the sector is kept at 80 
K. As the leak is from the helium circuit to the insulating vacuum, the repair work will have no impact on the vacuum in 
the beam pipe. However the intervention will have an impact on the schedule for the restart. It is now foreseen that the 
LHC will be closed up and ready for beam injection by mid-November.

73  Alberto  I2PHD

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