Jefferson Lab Weekly Briefs August 31, 2016

Jefferson Lab Weekly Briefs
August 31, 2016


Jefferson Lab Published Journal Articles, Aug. 22-26

  • Yulu Huang, Haipeng Wang, Robert A. Rimmer, Shaoheng Wang, and Jiquan Guo. "Ultrafast harmonic rf kicker design and beam dynamics analysis for an energy recovery linac based electron circulator cooler ring." Phys. Rev. Accel. Beams 19, 084201.
  • Shichun Huang, Takayuki Kubo, and R. L. Geng. "Dependence of trapped-flux-induced surface resistance of a large-grain Nb superconducting radio-frequency cavity on spatial temperature gradient during cooldown through Tc." Phys. Rev. Accel. Beams 19, 082001.

Publications Refresher Course Set for Sept. 23
Mark your calendars and R.S.V.P. to attend the next Publications Refresher Course to have all your questions about Public Access answered and receive a demonstration of the Jefferson Lab Publications System. The next course is Friday, Sept. 23, at 9 a.m. in CEBAF Center room F224-225. R.S.V.P. to by close of business on Thursday, Sept. 22.

Pick Up a Free Book or Magazine!
Information Resources has added new library books to the free book cart. Remaining books will be disposed on Sept. 1. See the list here. The library is also offering a selection of older (2005-2015) copies of scientific journals and science-related periodicals on a first-come, first-served basis through the end of August. If interested, stop by, take a look, and feel free to take what you want. A list of the available titles is published online.

Clean Up Your Work Space with Responsible Records Management
Free up some space in your file cabinets and offices with this helpful tip from records management: Are there old copies of your department's travel paperwork, purchase orders and other financial documents stashed away in file cabinets or desk drawers? Recommended departmental retention for reference copies is currently plus one fiscal year, and these copies should never be retained for more than six years and three months after the fiscal year in which they were created. Adhering to the lab’s records retention schedule is critical to the credibility of the overall records management program. Old paper copies should be disposed or shredded. Contact Kim Edwards at for guidance or assistance on managing records.


The Cryogenics group reconfigured both CEBAF accelerator linacs over to the Central Helium Liquefier-2 plant and shut down and warmed up the CHL-1 plant for the summer to support the following maintenance activities. In the CEBAF accelerator linacs, the group cleaned oil from the North Linac cooldown header that was deposited during the Hall D magnet quench a few years ago.

In the CHL-1, maintenance was performed on warm compressors C1, C2, C3, C4, C5, C6 and SBRC2; maintenance was also performed on the warm gas management control valves and the electrical distribution panels. The group also cleaned and serviced the main cold box diffusion pump and the SC1 cold box diffusion pump and replaced four failed temperature diodes in the main cold box. Also, a new recovery compressor skid C9 was fabricated, installed and commissioned; new power vacuum feedthroughs for SC1 CC1, CC2, CC3, CC4 and CC5 were fabricated and installed; and the group is nearing completion on the fabrication of the new guard vacuum system skid, with the installation and tie-in work to begin soon. Finally, Air Liquide and S2M are moving forward with repairs to the CC4 cold compressor.

In the CHL-2, maintenance work was performed on warm compressors C1, C2, C3, C4 and C5, and the variable frequency drives were upgraded on SC2 2 Kelvin cold box CC1, CC2, CC3, CC4 and CC5. Also, the new C6 warm compressor was received from PHPK.

In the Cryogenic Test Facility under the Utilities Infrastructure Modernization project, the new building addition was finished on the CTF plant building 57. The controls upgrade is underway to replace the CAMAC (Computer Automated Measure and Control) system with PLCs (Programmable Logic Controls). The new 4.5 Kelvin cold box was received from Linde, and the group is moving forward with installation. Also, maintenance was performed on all three expansion engines for cold box 2 and on the electrical distribution panels.

Also, the group completed and shipped the remaining three transfer line sections to Michigan State University. Finally, since the End Station Refrigerator plant continued running during the summer to support the halls, no maintenance was performed.

Environment, Safety, Health and Quality

Eye Protection
According to the National Institute for Occupational Safety and Health, approximately 2,000 U.S. workers suffer job-related eye injuries that require medical attention every day. Examples of injuries include abrading of the eye by small particles such as metal slivers and dust or a permanent loss of vision from larger objects that penetrate the eye, such as nails or other objects.

At Jefferson Lab, engineering controls are often used to reduce eye injuries; however, appropriate personal protective equipment, such as goggles and safety glasses, must also be used whenever an eye hazard exists. When you need to use eye protection, choose appropriate equipment for a given task by conducting a Task Hazard Analysis or reviewing an existing analysis specific to the planned activity. And, remember, your choice of eye protection should not only be specific to your work situation, it should also take into account your personal vision needs.

NIOSH offers a handy, printable eye protection checklist for reference. For more information about the types of personal protective equipment used at Jefferson Lab, see ES&H Manual Chapter 6620 Appendix T2 Types, Description, and Use of Personal Protective Equipment (PPE).

Computing and Networking Infrastructure

Web Traffic Protections Begin Wednesday, Sept. 7
To provide improved security for Jefferson Lab systems, the IT Division will begin decrypting web traffic for those systems on the CUE 2, JLab Wireless and DOE networks on Wednesday, Sept. 7. This will allow the automated processes that the lab has in place to scan this traffic and remove identified viruses and malware. To determine what network your desktop is linked via, visit from a web browser on your desktop system. As noted in a previous brief, traffic from known medical and financial institutions will be exempted from decryption, as these are generally not sites from where malware and viruses are deployed. If you have any questions or concerns about this process, contact the IT Division Helpdesk at or x7155.


Hall B (SAF111) Safety Awareness Training Will Be Updated Sept. 1
SAF111 Hall B Safety Awareness Training has been revised for everyone needing the skill and will be available on Sept. 1. This training will expire on Oct. 1 for anyone who last completed this training prior to Sept. 1. Those that have taken the training prior to Oct. 1, 2014, will need to read and sign the training document and schedule a walk-through. Employees may make an appointment for the walk-through by contacting Eugene Pasyuk at or Doug Tilles at 757-810- 9576 or Subcontractors may arrange a walk-though with their SOTR. Those who completed the training by reading and signing the document and participating in a walk-through after Oct. 1, 2014, need only read and sign the new document.

Tornado Warning Siren Test Set for 10:30 a.m. on Friday, Sept. 2
Jefferson Lab's tornado warning siren will undergo its monthly operational test at 10:30 a.m. on Friday, Sept. 2. Don't respond to the siren; this is a test of the siren system and not a personnel response exercise. Individuals planning to be in the Central Materials Storage Area (where the siren is located) while the test is taking place must have with them and wear two layers of hearing protection.

Jefferson Lab Calendar of Events

Sept. 5: Labor Day holiday; Jefferson Lab closed
Sept. 19: Safety Shoe Truck on-site
Sept. 20-22: Cyber Physical Systems Summit

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.