Jefferson Lab Weekly Briefs November 6, 2013
Jefferson Lab Weekly Briefs
November 6, 2013
12 GeV Upgrade
In-tunnel testing of cryomodule C100-10 has been completed; testing of C100-08 is on hold, awaiting restoration of the South Linac to 2 Kelvin. Installation, including vacuum, diagnostics hookup and final alignment, is complete for the beamlines in the main “racetrack” of the accelerator with only some details of the vacuum system for the extraction region left to complete. Final alignment of the Transport Channel recombiner is underway. Beam pipes for the Hall A beamline are going in, and the dipole magnets for the Hall B beamline are installed. All of the radiofrequency construction work has been completed. High-power testing of the new box supply for arc 1 is complete. Installation of the new box supply for arc 2 is complete, and high-power testing is underway. The new box supplies for arc 4, arc 5 and the beamline to Hall A have arrived. The vendor for the box supplies is resolving a component problem with the higher-power units. During high-potential testing of the dipole magnets, a problem was identified with one of the YB septa in the east spreader needed for beam to Hall D; mitigation options have been developed and are being evaluated. The vendor for the 20 Amp trim supplies resolved its problem and was cleared to resume shipments after implementation of the corrections. The control system software scope has been completed; the scope for the Harps is complete as well. All of the 12 GeV cryogenics system scope was completed in September.
APS/AIP Congressional Science Fellowships
Center for Theoretical and Computational Physics
Until now, most calculations of the quark mass function have been done in Euclidean space-time (where real time is replaced by imaginary time). Recently, this mass function was calculated in real-space time, with parameters adjusted to agree with lattice data. The interaction used to calculate the mass function is identical to the one used in the covariant spectator theory (CST) relativistic equation, also formulated in real space-time, that incorporates spontaneous chiral symmetry breaking (and hence is able to explain how a dressed quark mass can be spontaneously generated and why the pion mass is naturally small), and, when solved, will be able to predict the meson spectrum. A new calculation of the pion electromagnetic form factor, using the pion wave function derived from the CST equation and the new dressed quark mass function, agrees well with the data.
The Machine Shop is presently manufacturing or continuing to manufacture:
The shop has processed 77 job requests since Sept. 23.
JLab Calendar of Events
Nov. 8-9: SOLID Collaboration Meeting
Environment, Safety, Health and Quality
New Hazardous Communication Requirement
Watch for, Heed Radiological Postings in TEDF Buildings
All lobby, office and meeting spaces will remain open to anyone with a Jefferson Lab badge. However, the rest of the Test Lab, Test Lab Addition and Technology and Engineering Development Building will be posted as Controlled Areas, requiring GERT training or the accompaniment of a trained escort to enter. These include labs, areas of the high bays and technical work spaces. Please pay special attention to the new or existing Radiation Control postings on doors, around specific work activities, in storage areas and on safety bulletin boards.
Sentara Mobile Mammography
TIAA-CREF Individual Counseling Available by Appointment
New SOTRs Can Get Required Training on Nov. 13
Jefferson Lab Veterans Day Salute Set for Monday, Nov. 11
Tracking Thomas at Jefferson Lab
Ron Bartek correctly guessed the location for October 30. Honorable mentions go to Doug Higinbotham and Naomi Jarvis. Check out Tracking Thomas on flickr for a better view of his last location and this week's new mystery photo.
|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.|