Jefferson Lab Weekly Briefs July 20, 2011
Jefferson Lab Weekly Briefs
July 20, 2011
12 GeV Upgrade
Excellent progress continues to be made on the 12 GeV accelerator work planned for this shutdown period. The first 12 GeV cryomodule is presently being tested in the Test Lab, and the start of powered in-tunnel testing has a target date of Aug. 15. The radiofrequency zone for that new cryomodule is complete and fully populated with klystrons; testing of that zone has started. The second zone of rf is nearing completion. The computer network is fully up in the South Linac service building. Analysis of the microphonics characteristics of that cryomodule continues. One outcome of the analysis is that the net voltage of the cryomodule would surpass that needed for 12 GeV beam, provided the microphonics conditions in final operating mode are unchanged from the in-tunnel measurements taken in June. Assembly of the second cryomodule continues; assembly of the third has started. There are now 16 of the new klystrons on site.
In the injector, testing of the PEPPo polarimeter continues; penetrations that were used during installation have been sealed and refilled with stone. In the west arc, various magnet checks are in progress, and final alignment checks are continuing for arcs 2, 4, 6 and 8. In the South Linac, 2L23, 2L24 and 2L26 warm girders are ready for installation downstairs, while upstairs, 2L24 wiring checks and flushing is almost complete, and the 2L25 klystrons are going in. In the tunnel, personnel in Facilities Management and Logistics are working to correct or catch and control tunnel water leaks.
The injector beamline is under vacuum with two new valves, a new buncher ion pump, a new and upgraded beam viewer, a new spool/bellows beam position monitor replacement, a functional residual gas analyzer, and a new non-evaporable getter pump heater - all installed in less than two meters of beamline. The bake of this beamline has started, while the gun bake is complete. FEL staffers are working with the Cryogenics group and and ESH&Q to find a better procedure for installation and removal of the U-tube of the injector cryomodule as part of its safety vigilance.
There is good progress with the refurbishment of the east arc 5 dipoles. To date, all east arc 5, 7 and 9 dipoles have been removed. Refurbishment tasks in the south side of the east arc have been completed. Magnetic measurement and re-installation is scheduled for completion by July 22. In the west arc, the final alignment has been completed, with the magnets re-surveyed to their pre-shutdown positions.
Hall A's G2P beamline installation continues on schedule, with the FZ2 stand installed and its initial alignment complete. The FZ2 magnet travels vertically on this stand in order to accommodate more than two dozen different beam trajectories. The FZ1 magnet upstream of FZ2 was installed and aligned this week.
Environment, Safety, Health and Quality
American Red Cross Blood Drive
JLab Property Passes Now Available Online
Department of Energy Sponsors Food Drive
JLab Community Invited to Summer Interns Poster Session
Engineering Announces Special Cryo Seminars
Tracking Thomas at JLab
Congratulations to John Kelly, who was the first person to correctly identify the July 13 location. An honorable mention goes to Doug Higinbotham. Check out the Tracking Thomas webpage for a better view of his last location and this week's new mystery photo.
JLab Calendar of Events
July 29: Summer Intern Programs Poster Session, CEBAF Center lobby