Jefferson Lab Weekly Briefs April 17, 2013
Jefferson Lab Weekly Briefs
April 17, 2013
12 GeV Upgrade
Assembly of the 10th and final C100 cryomodule has been completed. Acceptance testing of the 9th C100 is underway in the Test Lab. The linacs have been taken to 2 Kelvin, and testing of C100 cryomodules in the tunnel has resumed in the North Linac. The production run for the new trim supplies has started. Commissioning of the new 4.5 K coldbox for the Central Helium Liquefier #2 is underway in collaboration with the vendor. Installation is underway for the 10 large BCOM dipole magnets in the spreaders and recombiners. Procurement of the electronics for the stripline beam position monitors has started.
Pursuant to a recommendation in the Final Report concluding the DOE Independent Project Review (IPR) of the 12 GeV CEBAF Upgrade Project held in November 2012, a Director’s Re-Baseline Review of the 12 GeV Upgrade Project was convened at JLab April 8-10. A team of 11 experts and one observer, led by Edward Temple, Jr., reviewed the status of the multiple, superconducting magnet sub-projects and the completeness and defensibility of all components of the project’s Estimate to Complete. The review helped identify areas of the re-baseline proposal in need of improvement in preparation for the next DOE IPR of the 12 GeV CEBAF Upgrade Project scheduled for May 7-9 at JLab.
Registration Open for Annual Users Group Meeting
Annual Meeting Registration Is Free for Students
The FEL team received $3 million capital fabrication funds from Virginia, which will be used to refurbish the F100 cryomodule and construct and install a new buncher system in the injector. Charge codes were allocated and turned on. The schedules are still being worked out, but the hope is that both the buncher installation and cryomodule replacement can occur in the first quarter of 2014.
The team received more vacuum hardware for the versatile vessel that will allow FEL and surrogate laser testing of the guided mode resonance (GMR) outcoupler mirror. Antireflection-coated zinc selenide viewports were ordered to do thermographic profiling of the optic during laser irradiation, using the FLIR thermal imaging camera.
Center for Theoretical and Computational Physics
A new model for nucleon generalized parton distributions (GPDs) has been developed, which takes into account the subtle relationship between the two basic nucleon GPDs, denoted H and E. The most important difference compared with previous simplified models is the change of the value of the H GPD at the "border point," when the fraction x of the initial proton momentum carried by the struck quark is equal to the Bjorken scaling variable xBj. This value plays an important role, since it determines the magnitude of the single-spin asymmetry in deeply virtual Compton scattering that was measured in several experiments at JLab.
The Document Control group reports that the new E-Sign process for engineering drawings has been in place for ten months now. The results have been significant. The average cost of supplies for all of Document Control since initiating the new E-Sign method has dropped more than 50 percent. The number of documents submitted for approval have increased by greater than 50 percent, while the number of monthly plotted drawings has dropped by a factor of 20.
JLab Calendar of Events
April 17: Teacher Night at JLab
Environment, Safety, Health and Quality
Resolving ES&H Concerns
Once your concern has been addressed, communicate any lessons learned to your staff, co-workers, supervisors and your Division Lessons Learned Coordinator. ES&H Manual Chapter 2310 offers more information on concern resolution.
Take Our Daughters and Sons to Work Day Is April 25
Colloquium & Public Lecture: Exploring the Proton as It Travels at the Speed of Light
JLab Celebrates National Library Week: April 15-19
JLab Records and Information Management Fact of the Week
RIM Trivia Question of the Week
Congratulations to Chris Wicker for his quick response to last week's question: Paper is an example of a "medium" for recorded information, as are flash drives, CDs and tapes. The earliest known form of writing is cuneiform, dating back to the 30th century BC. Upon what medium was cuneiform written? The answer was clay tablets.
Education Seeks Projects for Summer Honors Interns
Use On-Hook Dialing to Stop 911 Misdials & Wrong Numbers
Multimeter Missing from TED High Bay Work Area
Tracking Thomas at JLab
Harry Fanning correctly guessed the location for April 10. Honorable mentions go to Kurt Macha, Jim Follkie and Dick Owen. Check out 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.|