Jefferson Lab Weekly Briefs
March 25, 2009
Hall B completed about one-third of the data taking for the experiments that are part of the eg1-dvcs run group. The run was very successful, despite the lower-than-scheduled beam energy during the last four days of the run. Hall B is currently in maintenance mode: One of the 18 drift chambers is in need of repair work, and a heat shield in the target magnet will be modified to reduce interference with particles scattered at large angles.
By 7 a.m. on March 16, Operations successfully finished beam delivery to the experimental halls. The scheduled accelerator down started immediately. The Gun2 high-voltage chamber was replaced. Cryomodule NL04 was removed. The preparation for installation of a rebuilt cryo module at zone NL12 was started. Maintenance and checks were performed on beamline vacuum valves, magnets, the radiofrequency systems, RF separators, dumps, End Station Refrigerator, Central Helium Liquefier, software and etc.
Free-Electron Laser (FEL)
This week, FEL staff took advantage of an opportunity to thermally cycle the cryounit, which resulted in lower ambient vacuum in the injector. Otherwise, running continued well with tests on mirrors with new coating materials, tests on off-axis injection and tests of the optical cavity mirror feedback system and transport.
Members of the Theory Center, together with staff from the Physics and Accelerator Divisions and users, are holding the International Workshop on Positrons at JLab on March 25-27. The workshop plans to explore the case for positron physics at JLab, particularly within the context of the lab's energy upgrade to 12 GeV. The workshop will have sessions on positron-proton elastic scattering, deep inelastic and virtual Compton scattering with positrons, positron sources and applications, as well as ideas for new physics with positrons at the 12 GeV CEBAF.
JLab's Safety Numbers
79 Days since Last Recordable Accident (JLab record: 331)
JLab Calendar of Events
March 25-27: International Workshop on Positrons at Jefferson Lab
Environment, Safety, Health & Quality
Quality Assurance Program Review
Feedback from these assessments helps the lab improve processes and training, thus making safety planning more effective. An example is the identification of the suspect/counterfeit shackles found in the Machine Shop during a March 2008 DOE Surveillance. Without the feedback from these assessments, the training and traceability issues would not have been identified and the process would not be as effective.
If you are interviewed, please remember that the objective of this type of review is to assess our proficiency in the implementation of the QAP. Your experience and feedback are vital to driving improvements across the lab.
Computing and Networking Infrastructure (CNI)
Beware of Suspicious Holiday E-mail
In general, this has been a tough year. One security provider (www.scansafe.com) has reported that in 2008 there was a six-fold increase in malware and a 16-fold increase in data-theft trojans (those that steal your passwords, credit card information, etc.). This increase seems to be associated with the difficult economic times. Here at the lab, we have seen a substantial increase in the last two months in systems that had to be rebuilt due to infections.
One good rule of thumb to follow is to always be suspicious of documents and links whose source is unknown.
Firefox/Thunderbird/Adobe/E-mail Issues Resolved
All of your e-mail folders should have been moved as of March 24. If you are still missing e-mail folders, please e-mail a list of the missing folders to the Helpdesk.
Pager Changeout Nearly Complete
Paging with the New Pager System
Alphanumeric pages may also be sent from the staff search page and by e-mail. The e-mail address will be of the form First.Lastfirstname.lastname@example.org.
Voting Has Begun for the 2009 T-Shirt Design Contest
Annual Validation of Personal Property Underway
Food Drive for Foodbank Underway