Jefferson Lab Weekly Briefs
September 11, 2013
12 GeV Upgrade
The Super High Momentum Spectrometer support carriage and shield house assembly is progressing in Hall C. The SHMS support carriage steel structure is complete, and forming for the concrete shield house has started. The site safety plan has been approved, and the Preliminary Hazard Analysis has been performed by the subcontractor. Due to the unique nature of the proprietary concrete mixture, some of the batching will be performed on site. The vendor responsible for mixing the concrete is setting up to verify the exposure control plan through off-site air monitoring prior to batching. Jefferson Lab’s Industrial Hygiene and 12 GeV Safety Manager will monitor the process.
APS/AIP Postdoc Science Policy Fellowship Announced
With the end of the Long Shutdown (LSD) nearing, EES groups have been busy finishing up installation of 12 GeV upgrades and starting system checks to prepare for the accelerator start up. The Safety Systems group (SSG) has been busy supporting integration of new components into the Personnel Safety System (PSS) and preparing for the semi-annual certification of the PSS. Certification involves testing every input and output of the safety systems. The tests culminate in actual turn on and shut down of interlocked equipment. In preparation for the upcoming run, beam loss monitors are restored throughout the accelerator. Over the coming weeks, the SSG will be testing the complete machine protection system.
The Radiofrequency group is completing power testing of the last new 12 GeV RF zone prior to connection to the final C100 cryomodule for commissioning. The group has also been engaged in completing the re-installation of 80 modified RF circulators in all 12 GeV RF zones. Assembly work is being completed on a final C50 RF zone and on the Injector R100 RF system. Finally, the RF group has continued supporting the superconducting radiofrequency recovery and re-commissioning of all the CEBAF cryomodules that were warmed up to room temperature during the shutdown.
The DC Power group is in the process of completing the hookup of all magnets that were installed, re-built or reconfigured during the LSD. Initial system checks on interlocks, wiring and polarity of all the magnets has now started. More than 2000 existing power supplies need to be made operational in the next few weeks. Two of the new main arc dipole power supplies, received this summer, are undergoing system testing prior to connection to the tunnel magnet strings. The rest of the new power supplies are scheduled for delivery by January.
As the beam lines in the tunnel are assembled, the Instrumentation and Controls group has been installing beam diagnostic equipment, hooking it up and starting preliminary check out. These items include beam current monitors, many beam position monitors, harps, viewers and synchrotron light monitors. Many thousands of signals for diagnostics, vacuum monitoring, valve control and other systems must be checked prior to beam operations.
The Fabrication Support group has been busy building and wiring sub-assemblies for all areas of electrical engineering, including BPMs, separator heater control chassis, vacuum system power supplies and cable fabrication. The electrical power installation folks are supporting installation in many areas with cable pulls, AC power installation and magnet hook up.
It looks to be a busy few months ahead as the shutdown comes to a close and the accelerator is prepared for operation after a 16 month pause in beam delivery.
Environment, Safety, Health and Quality
Ladders and Scaffolds
As we become busy completing important tasks, it's important to remember to keep lift, scaffold and ladder safety in mind at all times. Here's a quick list of checks to make as you approach the next lift, scaffold or ladder for work and at home:
Computing and Networking Infrastructure
CNI Maintenance Period Set for Tuesday, 5-8 p.m.
TIAA-CREF Onsite Individual Counseling Sessions
Get Fit with Fido!
TEDF Dedication Ceremony R.S.V.P. Due
Tracking Thomas at Jefferson Lab
Naomi Jarvis correctly guessed the location for Aug. 28. An honorable mention goes to Casey Heck. Check out Tracking Thomas on flickr for a better view of his last location and this week's new mystery photo.
JLab Calendar of Events
Sept. 11: Standard High & Ultra-High Vacuum Seminar
|JLab Weekly Briefs is an ongoing publication providing information on the status of safety, accelerator operations, experiments, free-electron laser, reviews, upcoming activities and special events. Deadline for submission is every Tuesday by 10 a.m. Submit new items to: Public Affairs or contact Kandice Carter at x7263.|