Jefferson Lab Weekly Briefs February 5, 2014
Jefferson Lab Weekly Briefs
February 5, 2014
12 GeV Upgrade
Phase 2 of the Accelerator Readiness Review (ARR) is complete. It was held during the last week of January by reviewers from across the DOE community. The goal of Phase 2 of the ARR was twofold: to determine Jefferson Lab’s readiness for the safe and effective delivery of multi-pass continuous wave (CW) beam to Hall A and provide multi-pass tune beam to the Hall D Tagger Vault. Phase 2 followed the same format as Phases 1A and 1B, with both presentations and walk-through inspections of work locations. Despite the schedule changes due to inclement weather that week, the committee’s report stated that it as able to “visit all the areas of the accelerator facility and experimental halls critical to this review, and were able to meet and talk with key personnel.” The committee noted that there is some work that remains to deliver multi-pass CW beam to Hall A, but it is “well defined and the work is progressing.” The committee noted that preparations for beam to the Hall D Tagger Vault were not as advanced as Hall A. Jefferson Lab’s internal work control and tracking processes will be used for managing the remaining work. Local ARR Team members will report to the ARR Committee when the requirements have been met for both Hall A and the Hall D Tagger. This is consistent with the previous phases of the ARR.
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Center for Theoretical and Computational Physics
A new method has been developed that allows one to analytically calculate the evolution of distribution amplitudes, the basic functions that accumulate information about the quark momentum necessary to describe hard exclusive processes in Quantum Chromodynamics. In many important cases, the initial distributions are singular: they may have jumps and cusps at some points inside the support region or have non-zero values at the end-points. The usual method of expansion in oscillating Gegenbauer polynomials requires an infinite number of terms in order to handle such singularities, while the new method produces smooth curves from the start and needs only one or two iterations to obtain a reliable result.
The Alignment group has been working in all of the experimental halls recently. In Hall A, the group has been working on final alignment of beamline components and the beam pipe through the Compton area. In Hall B, a survey of the Forward Time-of-Flight panels on the forward carriage has been completed. In Hall C, a survey to characterize the features of the Super High Momentum Spectrometer carriage was carried out. In Hall D, the group continues to support the ongoing magnetic mapping of the Tagger magnet. In the magnetic measurement facility, refurbishment of the spare YB and the Hall C BE magnets is being carried out.
JLab Calendar of Events
Feb. 17: Safety Shoe vendor onsite
Environment, Safety, Health and Quality
Walking on Icy Surfaces
Computing and Networking Infrastructure
Computer User Audit Begins Soon
Monthly Tornado Siren Test Set for Friday
Kudos to Blood Drive Participants
Tracking Thomas at Jefferson Lab
|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.|