Jefferson Lab Weekly Briefs
June 4, 2014

12 GeV Upgrade

Hall B Update
All sectors of the CLAS12 Forward Time-of-Flight (FTOF) arrays, FTOF1-a and FTOF1-b, and the PreShower Calorimeter (PCAL) have been mounted on the forward carriage in Hall B, connected to the new FADCs, discriminators and high voltage, and have been read out. All of the Region 1 Drift Chambers have been shipped from Idaho State University to Jefferson Lab, with four now ready for installation and two having instrumentation added. All Region 2 Drift Chambers are on site and undergoing final high-voltage testing. Four of the Region 3 Drift Chambers are ready for installation and the fifth is having instrumentation added. The sixth Region 3 Drift Chamber has had all of its wires strung and is having the window fitted in preparation for first testing and conditioning; this completes wire stringing for the Drift Chambers.

Assembly and testing of the CLAS12 Silicon Vertex Tracker (SVT) production modules continues at Fermilab, with over 20 now completed and construction expected to continue until the fall of 2014. A test fit of the SVT modules into their support frame has been performed in the clean room at Jefferson Lab in preparation for assembly of the first three layers of the SVT barrel. The containment vessel for the High Threshold Cerenkov Counter has had the photomultiplier tube supports added and is being readied for mirror installation this fall. All of the coated production mirror segments are on site and tested. For the existing Low Threshold Cerenkov Counter (LTCC), the mirror refurbishment is complete for the first of three types of mirrors and the first batch of the aluminized Lexan strips have arrived from the vendor. The LTCC box modifications and new supports are also underway.

The practice coil for the CLAS12 Torus magnet was sectioned and unfortunately found to have one section that's 70 cm long that was not wetted by the epoxy used to bind the coil turns. Work at Fermilab was re-directed to address this and revise the epoxy impregnation procedure. A second Torus practice coil will be wound, epoxy-impregnated, and then cut apart and examined to verify the new epoxy process before proceeding to further production coil winding. Major parts for the Torus continue to arrive at Jefferson Lab. Pre-assembly of the Torus thermal shields is ongoing, and the first of the vacuum jackets has had all the necessary welding completed. The vendor for the Solenoid magnet has prepared the manufacturing tooling to wind the Solenoid coils and is cleaning the conductor for the Solenoid practice coil, which will be wound starting in mid-June.

Physics

Jefferson Lab Published Journal Articles, May 26-30

  • B. Dey et al. (CLAS Collaboration) "Data analysis techniques, differential cross sections, and spin density matrix elements for the reaction gamma p --> phi p." Phys. Rev. C 89, 055208 (2014).

Remember to submit your papers for approval to the Jefferson Lab Publications database.

Center for Theoretical and Computational Physics

In a recent paper, theorists at Jefferson Lab and the College of William and Mary used lattice QCD to calculate the ratio of leptonic decay constants of the excited states of the pion to that of the ground state. They found that the ratio was only mildly suppressed for the first excited state, but far more strongly suppressed for the second excited state. The strong suppression for the second excited state is consistent with previous lattice calculations by the Jefferson Lab group, suggesting that this state is predominantly "hybrid," in which gluons play a manifest role.

Facilities Management and Logistics

Part of Lawrence Drive to Become One-Way Only
Jefferson Lab and the School Bus Depot will be sharing the Hogan Drive entrance with the new Tech Center at Oyster Point Market Place development that is currently being constructed between Hogan Drive and Oyster Point Road. To accommodate this additional traffic on Hogan Drive, the developer is going to add a new entry and exit turn lane, as well as a road divider on Hogan Drive. These changes make it necessary to convert the north end of Lawrence Drive to a one-way street.

The one-way street will start at the intersection of Lawrence Drive and Hofstadter Road and will continue to Hogan Drive. Those traveling north on Lawrence Drive will be required to turn onto Hofstadter Road to exit the lab. The use of Hofstadter Road will also be required when leaving the Applied Research Center and Support Services Center parking lots if you wish to exit the lab using Hogan Drive.

The one-way conversion of Lawrence Drive will occur on June 15. Awareness signs will be posted around the affected area to provide proper notification of the change.

Engineering

Training Sessions for Geometric Dimensioning and Tolerancing
The Mechanical Engineering Group is developing a series of "Lunch-and-Learn" training sessions for Geometric Dimensioning and Tolerancing (GD&T) per the ASME Y14.5-2009 Standard. At this point, the group is planning to hold the sessions on Wednesdays, noon to 1 p.m. If you are interested in attending these sessions, send send an email to Tim Michalski indicating your interest in participating in the training, as well as any comments you might have. This activity will commence in the next couple of months, pending the level of interest.

Environment, Safety, Health and Quality

Staying Hydrated
The Tidewater area is known for hot and humid summers. Those conditions, coupled with manual labor, can lead to a range of adverse health effects for different people if proper precautions are not taken. Any workers who labor in areas without air conditioning should be aware of the possible effects of heat and take precautions. For instance, staying hydrated is a key tool for beating the heat. Here are some tips for making sure workers consume enough water to stay hydrated all day:

  • Most people should drink slightly more than is dictated by thirst;
  • Hydration should be sufficient to make the urine almost as light-colored as water at least once per day; and
  • Sports beverages should be used instead of plain water if the person will be sweating for more than one hour.

If an individual has any questions about whether his or her personal health might be adversely affected by high temperature, he or she should consult a physician and/or Occupational Medicine, x7539.

Computing and Networking Infrastructure

Jefferson Lab Spam and Virus Filter Software Changing
On June 17, the CNI group will migrate from the current spam and virus solutions to an updated environment. This environment is expected to provide better spam- and virus-blocking capabilities, while also providing a local (at Jefferson Lab) User Spam Quarantine server. Two training sessions will be held in the CEBAF Center auditorium at 2 p.m. on Wednesday, June 11, and at 2 p.m. on Thursday, June 12. This training will provide information on how to manage your individual message quarantine. If you have any questions or concerns, contact the IT Division Helpdesk or x7155.

SmartCard Renewals
If you have a Jefferson Lab SmartCard, you must renew your SmartCard by visiting the IT Division Helpdesk between June 2 and July 11. For security reasons, Jefferson Lab SmartCards expire every three years, which means they must be renewed to continue functioning. In addition, the CNI group is making other changes to the SmartCard system that will require all cards to be renewed (even if issued recently).

To avoid problems and delays, be sure to have your card renewed between June 2 and July 11. Once the expiration date passes, the card will no longer work, and the user will not be able to log in to Jefferson Lab systems using the card. If you have any questions or concerns, contact the IT Division Helpdesk, x7155.

Announcements

Pressure Systems Awareness Training Offered
A training session for SAF130A, Pressure Systems Awareness, will be held on June 10 at 2 p.m. in CEBAF Center room F224-225. Registration is available through the Learning Management System. If you need this training, register and make plans to attend.

2014 Open House Thank You and Survey
Public Affairs extends its many thanks to the great volunteers who made the 2014 Open House successful. We'd also like to give all volunteers the opportunity to provide feedback on their experience and to offer suggestions for improving the event. If you volunteered for the Open House, please take a moment to complete this brief survey about the event. The results will be tallied and considered in planning the next Open House.

New Travel Options from PHF
PeoplExpress will begin flying out of Newport News Airport on June 30. Initial destinations are Newark, Pittsburgh and Boston. Tickets go on sale today, June 4, with one-way fares starting at $76. Future destinations include West Palm Beach (July 15), Atlanta (Aug. 1), St. Petersburg (Aug. 28), and New Orleans (Aug.28). If you are looking for flights, check the PeoplExpress website or have your Travel Coordinator ask CI Travel about flights.

Jefferson Lab Calendar of Events

June 2-14: Hampton University Graduate Studies Program
June 5-6: Joint Hall A & C Collaboration Meeeting
June 16: Safety Shoe Vendor onsite
June 16-18: Heavy Photon Search Collaboration Meeting
June 18-21: CLAS Collaboration Meeting

 

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.