Jefferson Lab Weekly Briefs February 1, 2017
Jefferson Lab Weekly Briefs
February 1, 2017
12 GeV Upgrade
The Central Time of Flight (CTOF) detector was installed on a temporary stand in Hall B for the upcoming first beam run for CLAS12. The stand reproduces the points on the Solenoid cryostat to which the CTOF must attach in its final configuration following magnet arrival and commissioning. The CTOF was subsequently cabled, brought to operating voltage and checked for light leaks. The High Threshold Cherenkov Counter (HTCC) was moved from its construction area in the TEDF Building to Hall B and placed on the beamline. The tungsten Moeller shield cone was then added, and the HTCC was rolled into place and hooked up to signal and high-voltage cables, after which circulation of the carbon dioxide operating gas was started. The Silicon Vertex Tracker was then brought to Hall B from the Experimental Equipment Lab cleanroom. After some adjustment, it was rolled into its space inside the CTOF, which in turn had been rolled downstream close to the HTCC. The CTOF was stopped just short of what will be its final operating position in the future in order to accommodate a temporary target for the first beam run. This target is a carbon fiber that is mounted onto a beam harp and placed just at the entrance to the HTCC gas volume. The upstream and downstream sections of beamline were added and pumped out. Finally, some lead bricks were placed at the spot on the existing tagger magnet where the beamline exits to act as extra shielding for the upcoming first beam-tuning exercises.
Publications Training Offered
These steps are required for Jefferson Lab's compliance to the Department of Energy's Public Access Plan. If you plan to attend, let Kim Edwards know by emailing email@example.com no later than Thursday, Feb. 23.
Nominations Are Being Accepted for the 2016 JSA Thesis Prize
JSA/JLab Graduate Fellowship Program Now Taking Applications
Apply Now for Sabbatical and Research Leave Support at Jefferson Lab
Center for Theoretical and Computational Physics
New work from the Theory Center presents a nonperturbative relation between the finite-volume spectrum of coupled two- and three-particle systems of identical scalar bosons and the infinite-volume S-matrix for such theories. This is a necessary formal development that will allow future lattice QCD studies of resonances that couple to two- and three-particle states. One prominent example of the latter is the Roper, which decays approximately 25-45 percent of the time to N + π + π.
Facilities Management and Logistics
Jefferson Lab Entrance at Rattley Road Closed for Construction on Saturday, Feb. 4
If you have questions about this road closure, contact Bob Sperlazza at x6241 or firstname.lastname@example.org.
Environment, Safety, Health and Quality
Fire Protection Is Everyone's Responsibility
The Fire Protection program applies to everyone at Jefferson Lab, and you can find out more about the program by clicking the link above.
Tornado Warning Siren Test Set for Friday, Feb. 3
Reminder: Annual Property Training & Validation Due March 31
People in the News
Jefferson Lab's Chief Technology Officer, Drew Weisenberger, was in the news last week at the University of Regina for work involving PhytoPET. Read all about it in the Regina Leader-Post.
Jefferson Lab Calendar of Events
Feb. 4: Va. Regional High School Science Bowl
|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: the Communications Office or contact Kandice Carter at x7263.|