Jefferson Lab Weekly Briefs July 30, 2014
Jefferson Lab Weekly Briefs
July 30, 2014
12 GeV Upgrade
The Hall D Barrel Calorimeter, Forward Calorimeter, Forward Drift Chamber, Central Drift Chamber and Time of Flight wall, i.e. the five large subsystems of the main spectrometer in Hall D, are all being commissioned in their final positions. The fixed array tagger hodoscope and pair spectrometer detectors are being installed. The detector elements for the tagger microscope and the start counter are being assembled at the vendors’ sites, with their arrival expected in August for installation into the hall. Operation of the electronics, the trigger network, and the data transfer from the experiment’s digitizers all the way to the data storage silos has been demonstrated, with effort now focused on operating all electronics and data acquisition crates in parallel. Candidates for the thin diamond crystals needed to create the Hall D photon beam have been tested at the CHESS (Cornell High Energy Synchrotron Source) synchrotron light source and shown to have adequately narrow rocking curves. These will be subsequently thinned to 20 microns, as needed for the coherent bremsstrahlung radiator. The repairs to the Hall D helium refrigerator have been completed. The refrigerator plant was restarted and tested, and in parallel the cool-down of the Hall D solenoid magnet also was started. Earlier this week, the refrigerator was connected to the solenoid, and the coil return temperatures are between 8 Kelvin and 11 K.
The Alignment group reports that they have finished or are working on the following projects:
The Magnet Measurement group has been working on the design of a new portable test stand that will enable the measurement of the magnetic field of large magnets in situ. The final drawings are almost complete.
Facilities Management and Logistics
Jefferson Lab Annual Property Inventory Is Underway
To complete the inventory, each item must be physically seen by a member of the property office. Note that the property custodian is responsible for knowing the location of and searching for, if needed, their assigned property, not the property staff. Property staff will go to the location identified for each item during the property validation to inventory the property. The assigned custodian will be notified of any item not located at its specified location, and the item will be reported as "missing" until the item is physically located by the custodian and verified by property staff. If you have questions, contact Christian Whalen at x5899.
Computing and Networking Infrastructure
Central Computing Outages Set for Saturday, Aug. 16
Summer Science Student Poster Session Set for Aug. 1
Roy Whitney Retirement Celebration Scheduled for Aug. 1
JLab to Test Tornado Warning Siren at 10:30 a.m. on Friday, Aug. 1
Department of Energy Food Drive Ends Thursday
TIAA-CREF Financial Education and Retirement Planning Resources
Jefferson Lab Calendar of Events
July 28-31: Program Advisory Committee Meeting (PAC42)
|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.|