Jefferson Lab Weekly Briefs
November 27, 2013
12 GeV UpgradeThe Hall D Barrel Calorimeter (BCAL) has been inserted into the solenoid magnet bore. The silicon photomultipliers that sense the light generated in BCAL have been mounted on the light guides, the light monitoring system built by the University of Athens has been added, and the electronics cabling and cooling piping added. The lead-glass Forward Calorimeter, which sits downstream of BCAL, has had its readout electronics added and its light-monitoring system installed, and it is being powered and tested. The Central Drift Chamber (CDC) has arrived at Jefferson Lab after having been constructed and receiving a full checkout at Carnegie Mellon University. It has been uncrated and tested, showing that no wires came loose during the trip. The Forward Drift Chamber has been assembled, moved to Hall D, surveyed, and is being prepared for installation by addition of its readout cabling. Florida State University has completed assembly of the time-of-flight wall to be located just upstream of the lead-glass calorimeter, and it has been delivered to Jefferson Lab. Preparation has started of the thinned diamonds that will serve as the bremsstrahlung target; scattered electrons from this target will be detected in the tagger hodoscope and tagger microscope, which in turn are being assembled by Catholic University and University of Connecticut staff, respectively. Installation of front-end electronics, data acquisition electronics, online computers and trigger electronics to render all the above equipment ‘live’ is proceeding apace, as is installation of needed infrastructure, such as cable race, racks, power transformers and distribution, chilled water distribution, and the gas distribution system. The tagger magnet is being readied for field mapping, as is the magnets for the pair spectrometer.
PhysicsJefferson Lab Published Articles, Nov. 18-22
Remember to submit your papers for approval to the Jefferson Lab Publications database. The next Publications Refresher Course will take place Monday, Dec. 9 at 9 a.m. in CEBAF Center room F226. To attend, R.S.V.P. to Kim Kindrew.
Center for Theoretical and Computational PhysicsA new paper explores the role of final-state interactions (FSI) in inclusive deep-inelastic scattering from the deuteron, which give corrections to the usual approximation in which the beam scatters incoherently from the bound nucleons. Sizable FSI contributions are found for parton momentum fractions x > 0.6 and momentum transfer Q2 < 10 GeV2, increasing in magnitude for lower Q2, but vanishing in the high-energy limit due to phase space constraints. The results will be used to provide more reliable calculations of electron-deuteron scattering cross sections at Jefferson Lab energies.
EngineeringThe Installation and Vacuum groups continue to wrap up their work on the accelerator ring portion of the 12 GeV upgrade and are getting ready for Accelerator Run 1. Accelerator ring vacuum leak checking and pump down are nearing completion. Low-conductivity water system plumbing installation has been completed in the transport recombiner and continues in the line D tunnel ramp. Penetrations have been filled back up with stone and sealed. The 4D (123 MeV) spectrometer dump final shielding is in place. The Hall D Tagger shield wall final steel and fire stop is complete. The last beam switchyard (BSY) dipoles and girders have been installed, and the LCW has been connected. Beamline supports have been added in the 2E and transport recombiner. The Vacuum group hot check out process is well underway and will continue to support the first machine run.
The group also supported Hall A window dump inspection, electrical panel installation in the injector service building, removing material from the injector hatch, relocating liquid nitrogen lines in the BSY service building, installing lift plates for Hall B crane repair, removing two YB magnets for repair, and equipment removal and cleanup of the accelerator tunnel.
JLab Calendar of Events
Nov. 28-29: Thanksgiving Holiday, Lab closed
Environment, Safety, Health and QualityCold Weather Tire Care
Now that the cold weather is upon us, how many Jefferson Lab workers, who understand low temperatures and their relationship to the volume of materials, apply it to their car tires? If you haven't checked your tire pressure recently, you should take a moment to check and adjust the pressure, since the tire pressure will be lower than what it was over the summer. Low pressure adversely affects the tire's performance and increases its wear, in addition to changing vehicle handling.
While you're checking the pressure, it's also a good time to check your tires' tread depth. Tires should have at least 1/16 of an inch of tread. While Hampton Roads may not get snow very often, we do get heavy rain, and thin tread can contribute to an increased risk of hydroplaning. If you don't have a tire depth gauge, you can use a Lincoln penny. Take the penny and insert it head first into several grooves on the tire. If part of Lincoln's head is covered by the tread, then you have more than 1/16 of an inch. However, if you can see above Lincoln's head, you have less than that and should consider getting new tires very soon.
Computing and Networking InfrastructureVoicemail Outage Scheduled for Dec. 3
A voicemail outage is scheduled for 5-10 p.m. on Tuesday, Dec. 3, for a software update. If you have any questions or concerns regarding this outage, contact the IT Division Helpdesk, x7155.
The latest "Montage" by Lab Director Hugh Montgomery has been posted to the website. In this newest article, titled "LDRD, Investing in Ourselves," Mont explains the impetus behind and the purpose of the Lab-Directed Research Funding plan.
Difficulty Accessing Hazard Comm. Training?
If you're having trouble accessing the required OSHA Hazard Communication training, try this link. If you do not see the Hazard Communication Training (SAF000) listed at the bottom of the "General and Administrative" section of the page, be sure to "Refresh" your browser and check again. Supervisors can track participation through this link. If you have any questions, contact Jennifer Williams, x7882. All Jefferson Lab staff, students and users must complete the training by Dec. 1.
Sentara Mobile Mammography
Make your appointment today for the Sentara Mobile Mammography Unit, which will be at Jefferson Lab on Dec. 11, 9 a.m.-2 p.m. Mammography detects breast cancer, and The American Cancer Society recommends scheduling your first or baseline mammogram by age 40. It only takes 15 minutes! This service is open to all employees as well as their family members or friends as personal health insurances will be billed. To make an appointment, visit www.sentara.com and find Mobile Mammography Screenings under Screenings and Events or call 1-800-SENTARA (736-8272).
Open Enrollment for Jefferson Lab's 401k Scheduled
The 401(k) Group Supplemental Retirement Annuity (GSRA) Open Enrollment for Calendar Year 2014 will be offered Dec. 3-13. Two questions everyone should consider about enrollment are:
JSA Initiatives Fund Program Call for Proposals Issued
Jefferson Science Associates has issued the FY2014 Call for Proposals for the Initiatives Fund. Original proposals are due directly to JSA by COB Dec. 23. Information on JSA's Initiatives Fund proposal process, evaluation committee, review process and the criteria to determine proposal merit, as well as specific instructions to proposers, can be found online. Questions about the Initiatives Fund may be submitted to Elizabeth Lawson.
2014 General Access RWP Is Available
The 2014 General Access Radiological Work Permit (RWP) is now available for signature. If you are a radiation worker at Jefferson Lab, you must sign the new RWP before Dec. 31 to retain your accelerator site access. To access the RWP, visit the web-based training page and open document SAF801kd. You may access, read and sign this document from offsite. If you have questions about the permit, contact Radiation Control at 876-1743 or 876-5342.
JAG Holiday Party for Jefferson Lab Children and the Young at Heart
The JAG Holiday Party is scheduled for Saturday, Dec. 14, 10 a.m.-1 p.m. in the CEBAF Center lobby. All employees, contractors, users and their children are invited. Families are encouraged to bring a new, unopened toy for the U.S. Marine Corps Reserve's Toys for Tots program. Get your picture taken with Santa Claus, who plans to drop by with the snow dogs, Nikko and Tally. (Owners Dan and Kim Young are members of the JAG Dog Training Club, and Nikko and Tally are trained service dogs). Come and enjoy holiday-themed games, crafts and light snacks, including ice cream prepared with liquid nitrogen. To end the day, staff from Jefferson Lab's Science Education department will perform their Cryo Show. All children must be accompanied by an adult.
Volunteers Needed to Help With the Holiday Party
Volunteers are needed to help with the JAG holiday party. Sign up online today. Positions include:
Jefferson Lab will again participate in the U.S. Marine Corps Reserve's annual Toys for Tots toy drive. Collection boxes will soon be placed near the main entrances of CEBAF Center, MCC, SSC, ARC and TED Buildings.
Ready, Set, Hang Those Decorations
The Jefferson Activities Group is sponsoring a Holiday Office Door/Cubicle Decorating Contest. Prizes will be awarded to Best Decorated, Most Original and Silliest. All employees, users and contractors with an office or cubicle may enter the contest (individuals or groups). Include your name(s), building number and office/cube location. Judging will take place Dec. 17. Winning entries will be announced Wednesday, Dec. 18. Decorations may go up as early as Dec. 2 and should be taken down by Jan. 3. Decorating materials must be fire resistant and only UL-approved lighting/electronics may be used. No unwrapped food items are allowed. To enter, email JAG Chair Mary Jo Bailey by COB Dec. 13.
Tracking Thomas at Jefferson Lab
|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.|