Jefferson Lab Weekly Briefs May 24, 2017

Jefferson Lab Weekly Briefs
May 24, 2017


Hall D Update
One of the triannual GlueX Collaboration meetings took place on May 15-17. Several topics were discussed, including the physics results obtained with the Spring 2016 run, the preparations for the analysis of the Spring 2017 data, and new proposals to the Program Advisory Committee. The 2017 data will be processed at the Jefferson Lab computing center. It is expected that the data will be ready for physics analysis by mid-July.

Center for Theoretical and Computational Physics

The first global Quantum Chromodynamics analysis of polarized inclusive and semi-inclusive deep-inelastic scattering and single-inclusive e+e- annihilation data has been performed, fitting simultaneously the parton distribution and fragmentation functions using the iterative Monte Carlo method. Without imposing SU(3) symmetry relations, the strange-quark polarization is found to be very small, consistent with zero for both inclusive and semi-inclusive data, which provides a resolution to the so-called "strange quark polarization puzzle."

Facilities Management and Logistics

Electric Vehicle Charging Not Allowed On-Site
Jefferson Lab does not have electric vehicle charging stations, and there are currently no plans to install them. JSA employees, Users and subcontractors may not charge personal vehicles on-site, as site power is to be used for authorized contract purposes only. Recharging a personal vehicle with power purchased with government funds is equivalent to theft. While some DOE contractors have installed recharging stations to promote the personal use of electric vehicles, the cost is borne by the contractor rather than the government. If you have any questions or concerns about this policy, contact the Facilities Manager, Rusty Sprouse, at or x7589. For a list of nearby charging stations, see the link.


The alignment group has been working with the SRF team working on the Linac Coherent Light Source II project on the alignment of cryomodules for the upgraded light source at SLAC. This is a multistep process that involves careful quality control checks  of delivered parts, as well as several alignments during the assembly process. The group has been working on modules CS002, CS003 and CS004 over the past few weeks. Other work included the following.

  • In Line A, Compton magnets 1 and 4 were re-positioned to improve the field that the beam travels through. This will be important for experiments scheduled this fall.
  • In Hall B, equipment in the collimator, Faraday cup and stopper were all aligned.
  • All the super harps for Line C were repaired and re-fiducialized. This should lead to better results from these harps. In Hall C, the Super High Momentum Spectrometer pointing angle was checked to ensure that it is tracking and matching the angle plates. More work will need to be completed on this.
  • Work in the accelerator during the down consisted of checking control monuments to see if there are any movements relative to past observations.

Jefferson Lab Calendar of Events

May 22-26: QCD Evolution 2017
May 29: Memorial Day holiday (Jefferson Lab closed)
June 13-16: CLAS Collaboration Meeting
June 19-21: Users Group Annual Meeting
June 22-23: Joint Hall A & C Summer Collaboration Meeting
June 29-30: SoLID Collaboration Meeting

Environment, Safety, Health and Quality

Storm Water Drain Medallions Inform, Raise Awareness About Preventing Pollution in Storm Runoff
Polluted storm water runoff is often captured by municipal storm sewer systems and discharged into local rivers and streams without treatment. To raise awareness of storm water drains and the importance of pollution prevention within the lab community, Environment, Safety, Health and Quality and Facilities Management and Logistics staff installed in 2016 a number of storm drain medallions. Read on about the medallions and what they mean for the lab community.

Computing and Networking Infrastructure

VPN Service Allows Remote Access to Jefferson Lab Systems
The Virtual Private Network, or VPN service, allows Jefferson Lab employees and users to securely access Jefferson Lab internal file servers and services when away from the lab. This service allows additional access to some systems that aren’t typically available from offsite. To use this service, you must have multi-factor authentication. To get started, visit this link from the computer you will use to access Jefferson Lab systems from offsite: To log in, select the type of MFA that you use (CryptoCard Token or Smartcard). Once connected, internal websites are accessed using the WebVPN service. From there, you can optionally download the AnyConnect VPN client, which will place your computer on an internal Jefferson Lab network. If you have any questions about this service, contact the IT Helpdesk at or x7155.


Run-A-Round Results and T-shirt Distribution and Ordering
Jefferson Lab’s 32nd annual Run-A-Round on May 17 featured nearly 550 registrants with 400 finishing the run/walk. See the full memo for a link to the run/walk results, award information, free T-shirt distribution and options for ordering merchandise featuring the 2017 winning design (orders due by June 2).

Free Health Screenings Offered by Optima Health
Optima Health is offering free and confidential health screenings at Jefferson Lab on May 31. The 10-minute screenings will take place in CEBAF Center room F113. At this screening, you will learn more about blood pressure, cholesterol, diabetes risk, Body Mass Index, tobacco cessation, and the benefits of regular physical activity. This free service is open to Jefferson Lab employees as well as Users and subcontractors. Walk-ins are welcome, but an appointment is appreciated. The deadline for making an appointment for this free service is Thursday, May 25. To schedule an appointment, contact Occupational Medicine with your preferred appointment times (9 a.m.-1p.m.) at,, or x7539.

JSA Minority/Female Undergraduate Research Assistantship Taking Nominations
Jefferson Lab is seeking nominations of minority or female undergraduate physics students from accredited universities for a research assistantship for the 2017-2018 academic year. The assistantship provides students an opportunity to work on science and engineering projects related to the lab's research. Students must be nominated by a faculty member. The nomination deadline is Wednesday, May 31. This project is supported by the JSA Initiatives Fund program. For eligibility and nomination requirements, see the full posting.

Jefferson Lab Offers Teachers a Program that Brings Science Lessons to Life
The Jefferson Lab Science Activities for Teachers, or JSAT, program offers teachers the opportunity to develop useful classroom activities during the 2017-2018 school year. The after-school program is designed to increase teachers' knowledge of the physical sciences and to strengthen their teaching skills. Read more here.

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: the Communications Office or contact Kandice Carter at x7263.