Jefferson Lab Weekly Briefs June 3, 2009
Jefferson Lab Weekly Briefs
June 3, 2009
12 GeV Upgrade
The 12 GeV Upgrade Project has awarded a contract for the 4-meter dipole magnets to be used in the arc 10 beamline and the beamline to Hall D. In addition, the responses to the requests for the Best and Final Offers have been received for the beamline quadrupole magnet fabrication. Technical evaluation of the final submittals for the superconducting radiofrequency cavity fabrication contract has been completed. A design and safety review of the low-level RF controls was held on May 21; the review committee’s comments were positive.
In Hall A, production running for experiment E05-102, Measuring the Transverse Asymmetries in the 3He (e,e'd) Reaction, has been proceeding very smoothly.
The eg1-dvcs run is running smoothly, with the polarized target operating without problems in Hall B. The lost time, due to mechanical damage of the target during the first week, has been partially recovered. Hall B is at about 85 percent of its planned scenario at this time during the run. If things continue this way, the goal for this run should be achieved by the end of the run on June 13.
In Hall C, installation of the hypernuclear experiment continues with the High Resolution Kaon Spectrometer and the High Resolution Electron Spectrometer aligned into their final positions (including the tilt of the HES). The stand for the splitter magnet is in place and ready for splitter installation. The walls of the spectrometer shielding bunkers are mostly in place, and the personnel access platforms for both spectrometers are in place. Installation of detectors has started. The HKS wire chambers are installed and aligned.
The accelerator is running well, and Halls A & B received more than 170 hours of beam. There were two minor magnet problems, one with MARC1A, which was quickly fixed. The other problem was with the shunt magnet MYRAT03, which required a control module to be replaced. This period was marked overall by very smooth beam delivery to the two halls.
Free-Electron Laser (FEL)
Repairs to the low-conductivity water system were finished, and the system is being brought back into operation. FEL staffers provided first beam on Friday and will try to re-establish the robust and stable operation achieved before the lcw system failure. Staffers also held an external review of plans for a soft X-ray FEL. The ideas were well received, and a number of actions were identified to prepare a proposal for submission to DOE in September.
The leading-twist pion distribution amplitude (DA) describes the sharing (in fractions x and 1-x) of the total momentum of a fast-moving pion, when the pion is just a quark-antiquark pair. A possibility is investigated in <arXiv:0906.0323 [hep-ph]> that the pion DA is constant for all values of x. Such a model is shown to reproduce the recent large-Q2 BaBar data on the photon-pion transition form factor, considered the simplest observable to extract the pion DA, and can be used in the future to calculate other processes.
JLab's Safety Numbers
149 Days since Last Recordable Accident (JLab record: 331)
Environment, Safety, Health & Quality
With the weather starting to turn warmer, many of us are starting another year of yard work. The American Society of Hand Therapists suggests some basic gardening safety practices. It is important to remember that yard/gardening activities involve many repetitive tasks such as raking, weeding, digging and pruning. You can help avoid injuries by following these safety tips:
During April, JLab’s Quality Assurance Program was assessed by a team of four DOE representatives. The objective of this review was to evaluate how well JSA has implemented the Quality Assurance Program, in accordance with the Quality Assurance Order, DOE O 414.1C, which is part of the JSA management and operating contract. The review concluded that eight of the 10 criteria evaluated were met, and two criteria were partially met. The program was found to be programmatically compliant. The outcome represents a significant milestone and progress toward successful implementation of the JSA-JLab QA Program. A broad spectrum of JLab personnel were involved in this assessment and are commended for their participation and involvement.
JLab Emergency Backup Website Reminder
Specialty Gases Lab Truck Visit
Trailer #35 Has Moved
Timely Timesheets Aid Salary Adjustment Process
Watch for Construction Traffic Entering/Exiting JLab
JLab Calendar of Events
June 1-19: HUGS 2009
Summer Education Calendar