Jefferson Lab Weekly Briefs September 9, 2009
Jefferson Lab Weekly Briefs
September 9, 2009
12 GeV Upgrade
Major progress is being made on the various physics spectrometer systems. The second 12 GeV Upgrade superconducting magnet contract has been awarded for the Hall B torus magnet. Components for the Hall B CLAS12 preshower calorimeter detector have arrived, and a test set- up is being fabricated. The Hall C project manager convened a peer review of the Super High Momentum Spectrometer detector systems. The user-provided detector designs received uniformly positive remarks, with no recommendations. Assembly of a first article construction module of a major Hall D/GlueX detector, the Forward Drift Chamber, has begun here at JLab.
In Hall A, experiment E05-109, HAPPEx-III, a measurement of the nucleon strange form factors at high Q2, has completed its commissioning phase, both at one and at three pass. The experiment has started taking production data.
Overall, the accelerator was running well with low trip rates. High current (100 μA) was sent to Hall A whenever the hall requested it. On Thursday, more than 10 hours were spent to commission cryomodule 1L04. On Sunday, a failed UPS (uninterruptible power supply) dropped the North Linac to restricted access. In addition, iocse20 was not stable and the software group has been investigating it. Some magnets, radiofrequency cavities and a separator also caused downtime.
The FEL team resurrected the gun with gas processing and the machine is running again, although the voltage has been lowered to 325kV to reduce risk. In parallel, preparations are being made for replacement of the faulty ceramic with a new one that has bulk conductivity to eliminate the vacuum punch throughs. The FEL provided some beamtime for terahertz work, and staffers completed the draft proposal for the JLAMP amplifier. The proposal is now out to the technical committees for review.
JLab's Safety Numbers
56 Days since Last Recordable Accident (JLab record: 331)
JLab Calendar of Events
Sept. 11: United Way Day of Caring
Environment, Safety, Health & Quality
In virtually everyone's job, some lifting is required. Any activity that involves lifting carries potential for injury. Remember, when in doubt about your ability to safely lift an object, get help. Consider following these pointers:
For additional information, consult JLab ES&H Manual Chapter 6105, Office Safety, or contact JLab ESH&Q staff.
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