Jefferson Lab Weekly Briefs December 3, 2008
Jefferson Lab Weekly Briefs
December 3, 2008
12 GeV Upgrade
Preliminary evaluation of the vendor submittals for fabrication of the klystrons and superconducting accelerator cavities is complete. Evaluation continues on the vendor submittals for fabrication of the 4.5 Kelvin coldbox for the cryogenic system and for the 4-meter beam transport dipoles. Vendor submittals for fabrication of the beam transport quadrupoles have been received.
Repairs have been made on the superconducting magnet for the polarized target used in the Spin Asymmetries of the Nucleon Experiment (SANE) in Hall C. Several burned-out superconducting wires were found. These wires have been spliced using ultrasonic soldering, and the magnet is being closed up. It will be reinstalled in Hall C; if it functions properly, SANE will be able to run. The downtime due to the magnet is being used to do other work in Hall C. Improvements have been made to the SANE setup, and the high-resolution electron spectrometer (HES) and splitter magnet have been assembled. These magnets will be used in the upcoming hypernuclear experiment.
PAC 34 Call for Proposals Due Dec. 15
The accelerator performed at a high rate during this period with a total of 261 hours of beam delivered to Halls A and B. The only significant event was an End Station Refrigerator (ESR) trip due to a faulty Uninterruptable Power Supply (UPS). The UPS was replaced and the ESR brought back online.
Free-Electron Laser (FEL)
In the shortened holiday week, FEL staff high-voltage processed the FEL gun in preparation for operations.
In a recent paper (arXiv:0812.0187 [hep-ph]), a relativistic constituent quark model, previously calibrated by the nucleon and Δ(1232) physical data, is extended to the (unphysical) region of large quark masses simulated in lattice QCD. A single extra adjustable parameter - the constituent quark mass in the chiral limit - has been used in the comparison with the lattice data. A qualitative description of both the lattice electromagnetic nucleon and γN → Δ transition form factors was obtained for small pion masses, enabling a clear connection to be made between physical data and lattice QCD simulations.
JLab's Safety Numbers
84 Days since Last Recordable Accident (JLab record: 331)
JLab Calendar of Events
Dec. 3: Colloquium and Public Lecture
Environment, Safety, Health & Quality
Assessments and audits, when done properly, save the lab time and money. The feedback obtained from these events is crucial to improvement efforts, and in the long run, these improvements allow the lab to aggressively eliminate inefficiencies and time drains. This can have a significant impact on resource issues.
The lab's audit/assessment program is used to determine the effectiveness of its policies and procedures and to ensure that work is done safely and efficiently. Environmental concerns and quality controls are taken into account, as well as other high profile criteria.
The QA/CI Auditor/Assessor Qualification Procedure was written to provide individuals with a process and training program by which they can qualify to become an auditor/assessor. This procedure applies to any individual wishing to conduct an audit or assessment controlled by JLab or JSA. It does not apply to auditors or assessors from external organizations, such as the Thomas Jefferson Site Office, other DOE organizations, federal, state or local regulatory agencies, etc. Use of this procedure should result in high-quality feedback, thus strengthening the lab’s quality assurance program.
End-of-Year Radiation Badge Change Out
Last Chance to Schedule Mobile Mammography Unit Appointment for Monday
Survey to Assess Employee Concerns Programs
Children's Holiday Party
Toys for Tots Donation Drive
Calling All Amateur Interior Designers: Ready, Set, Decorate!
Children's Holiday Party Volunteers Needed