Jefferson Lab Weekly Briefs
July 6, 2011

Physics

In Hall A, the installation for the upcoming run period is proceeding. The spectrometers were surveyed and various stands and platforms were installed. Work progressed on the cryogenic system, the water system and the power supplies. In general, the work is ahead of schedule. A Hall A staff position is open and is being advertised.

Accelerator

It was another productive week for the scheduled accelerator down. The injector experiment (PEPPo) installation is almost complete. West arc magnet installation and alignment continues to move along rather nicely. In the east arc, removal of the magnet cooling water hoses, power leads and beam tubes continues, enabling the start of removal of the magnets from arcs 7 and 9. In the injector, a faulty fiber-optic cable for the beam sync signal was found and repaired. Over the weekend, a pump for the cooling water pipe trench failed, allowing rain water to enter the west arc. This slowly spread until a layer of water was around the arc and into the north linac. On Tuesday morning, a portable pump was used to move the water to a drainage sump for removal.

Free-Electron Laser

FEL staffers have begun the bake on the high-voltage DC gun, and the vacuum appears to be progressing well. The group has one component left to install on the injector beamline before it will be ready for bake. The valve replacements on the booster were completed and the unit is expected to be cooled to 4 Kelvin next week. Mirror replacement work in the infrared system is also progressing.

Center for Theoretical and Computational Physics

A new paper <arXiv:1106.5515> interprets lattice QCD results for the meson spectrum in terms of 'conventional' quark-antiquark bound states, supplemented by a spectrum of hybrid mesons in which an excited gluonic field plays an essential role. For the first time in a QCD-based calculation, the paper clearly identifies the lightest supermultiplet of hybrid mesons having J{PC} quantum numbers of (0,1,2){-+} and 1{--} and proposes that a gluonic field of chromomagnetic character is the lowest energy excitation. Existing models of hybrid mesons are considered critically and steps toward a QCD-based phenomenology of hybrid mesons are outlined, relevant for the searches being made now at COMPASS and in future Jefferson Lab experiments.

 

 

 

Environment, Safety, Health and Quality

With the many deliveries made onsite daily and the many large construction vehicles onsite, it's important to be especially careful when driving and walking around delivery or construction vehicles. These vehicles are particularly dangerous when they are engaged in backing up.

While backing, the driver can only look in one mirror at a time and would not see a person moving quickly from the other side of the truck. Sometimes the driver may have a spotter to assist in properly aligning the vehicle while backing, but these spotters may also have a difficult time seeing pedestrians or other vehicles.
 
Any time you are approaching a large vehicle either preparing to or in the process of backing up, give the vehicle an extra wide berth, whether you are in a vehicle or are a pedestrian. Never travel behind a truck that could back up or is moving backward. If you are already behind a vehicle that appears to be preparing to back up, or you hear the vehicle begin to alarm in preparation for backing up, be sure to quickly and carefully get out from behind the vehicle and/or sound you vehicle horn to alert the driver that you are behind them.

Announcements

Temporary Water Shutoff Today After Work for CEBAF Center, Test Lab & ARC
Water will be off temporarily after normal work hours this evening in CEBAF Center, the Test Lab and the ARC while Facilities Management & Logistics personnel test water backflow preventers. Water will be off in the Test Lab from 5:30-6 p.m., CEBAF Center from 6-6:30 p.m. and at the ARC from 6:30-7 p.m.

Quarterly Publications Training Offered July 12
If you have a paper in the works, including a journal submission; a conference presentation, poster or talk; or an e- or pre-print, you may want to brush up on JLab policy regarding publication requirements. A publications training session is set for CEBAF Center room F228 on July 12 at 9 a.m. To register for the training, email Kim Kindrew.

Email Vacation Utility and Phone Vacation Greetings Reminder
If you plan to be away from the lab for a day or longer, be sure to set up a vacation message by administering your personal greeting for your lab phone and a vacation bounce message using the Vacation Email Utility for your email. You may wish to include the dates you will be away from the office and an alternate contact for important business that cannot wait until you return. You can access the instructions for setting up these messages at the links.

Lunchtime Seminar on July 19 for Managing Stress in the Workplace
This bring-your-own-lunch seminar will take place in CEBAF Center room F113, noon-1 p.m. on Tuesday, July 19. The class reviews some basic concepts about stress and its effects on an individual. You will gain tips on how to recognize and manage workplace stress. Registration is required due to limited space. To sign up, contact Betty Beeler, x6999, or Bruce Ullman, x7170. See the link on Insight for more information on the seminar.

Tracking Thomas at JLab
Little Thomas is visiting all corners of the JLab campus. If you can identify his location this week, email Kandice Carter with your guess. Guesses are accepted through Fridays.

Congratulations to Val James and Michael Haddox-Schatz, who were the first people to correctly identify the June 29 location. Honorable mentions go out to Jason Willoughby, Narciso Gomez, Michelle Shinn, Dick Owen and David Anderson. Check out the Tracking Thomas webpage for a better view of his last location and this week's new mystery photo.

JLab Calendar of Events

July 11: Safety Shoe vendor onsite
July 29: Summer Intern Programs Poster Session
Sept. 5: Labor Day holiday; JLab closed