Fine Structure

More Faults at the LHC

I was wondering when this was going to happen: after checking the rest of the magnets at the LHC, more bad welds were found in another sector which now must be warmed, fixed and cooled down again. Luckily, since there's so much time between now and the expected restart date, this particular issue shouldn't delay that date at all. Presumably this is because the major project isn't fixing the welds, it's putting the safety valve system in place to make sure an unexpected quench doesn't cause another superfluid helium explosion (not the Bose-nova we've talked about before, just the dramatic increase in pressure when all that He expands into gas).

I'd be really interested in hearing the methods used to determine which sectors have bad welds if anyone has details.
http://www.universetoday.com/2009/02/02/more-faults-found-in-lhc-but-no-further-delay-to-start-up/