JLab Weekly Briefs - August 11, 2016

Jefferson Lab Weekly Briefs
August 11, 2016

12 GeV Upgrade

The Torus magnet for CLAS12 has been pumping down the past several weeks and is now circulating cryogens. The pump-down took time because the gas being removed is about 80 percent water vapor, which is known to be slow to evolve from the multi-layer insulation in the vacuum space. This was addressed by using the nitrogen system that normally cools the radiation shields to instead circulate 340 Kelvin nitrogen to warm the MLI and help drive out the water vapor. In parallel, the cryogenics distribution can that serves as interface between the End Station Refrigerator and the two magnets in CLAS12 has been completed and checked, and the four U-tubes connecting it to the Torus Service Tower have been inserted. The second review required prior to the start of cool-down, to examine this cryo can plus all the supporting warm gas piping and vaporizers, has been completed and its recommendations addressed. The last review, to be allowed to energize the Torus, has been held and its recommendations are in the process of being addressed.

The two splices connecting the first and third, and the second and fourth, of the four "Field" coils of the CLAS12 Solenoid have been prepared, now that all the temperature and strain gauges have been added to these coils, after which the helium piping will be welded in place. The fifth, or "Shield", coil for the CLAS12 Solenoid is complete and is suspended in the specialized tooling used to mate it with the first four coils for the Solenoid. In that next major step, the five coils are joined into one assembly by suspending the bobbin with the four Field coils inside the bobbin for the Shield coil. This "cold mass" assembly is then covered with a radiation screen and multi-layer insulation. The final major step in building the Solenoid will involve insertion of this cold mass assembly into the outer vacuum cryostat, the outer shell of which is now at the magnet vendor’s site. The two conical parts of the end sections of the cryostat have been formed and welded to their respective cryostat end-plates, and the inner bore tube for the cryostat is prepared.


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.

Center for Theoretical and Computational Physics

Given the potential of CLAS and GlueX to generate high-precision data on light mesons, one of the projects undertaken at the Joint Physics Analysis Center has been to investigate the Dalitz decays of η mesons. This process is particularly interesting given that it is isospin-violating and sensitive to the difference of masses of the light u and d quarks. A new paper has combined the recently published, high-statistic KLOE-2 data together with the earlier data from WASA-at-COSY to perform an amplitude analysis based on dispersive methods, and obtained a new determination of the so-called Q parameter, Q = 21.6 ± 4, which is related to quark masses.


The Alignment group has been working on the following projects:

  • Fiducialization of a C50-12 cryomodule for SRF;
  • Layout and alignment of components in the Low Energy Recirculator Facility in support of the DarkLight experiment;
  • Control surveys in the Hall D tagger area;
  • Re-measurement and update of the survey control network for the Linac Coherent Light Source-II prior to cavity alignment;
  • Alignment of the LCLS-II prototype cavities and the quadrupole;
  • Revised RF separators were pre-aligned and then aligned in the accelerator; and
  • Working with Hall B staff to align and position the Region One Drift Chamber detectors to the 12 GeV Torus magnet.

The Magnet Measurement group has been working on these projects:

  • Mapping the Solenoid magnet, which will be used in an injector gun test stand (a Lab-Directed Research and Development project);
  • Working with steel pucks to be inserted into the magnetic field;
  • Measurement of a DL dipole to improve the magnet's field map; and
  • Dry running and integrating code for Hall B's Torus mapping.

Jefferson Lab Calendar of Events

Aug. 11: Jefferson Lab Employee Tour
Aug. 15: Safety Shoe Truck on-site
Aug. 16: American Red Cross Blood Drive
Sept. 5: Labor Day holiday; Jefferson Lab closed

2016 Summer Physics, Science Education, Enrichment Programs at JLab
Aug. 8-12: Physical Science Investigation Teacher Program
Aug. 15-19: Science Camp for Deaf and Hard of Hearing Youth

Computing and Networking Infrastructure

IT Maintenance Day Set for Tuesday, Aug. 16
The IT Division is planning its monthly maintenance period for Tuesday, Aug. 16, 5-10 p.m. During this time, all MIS applications will be down while patches are applied to the central MIS database servers. All MIS applications will be back up by 10 p.m. Phones and computers on the Jefferson Lab network located in Building 89 will have a brief network outage while switches are replaced. Systems on the ACC network will not be affected. Patches to core Common User Environment software, such as Firefox and Flash, will be released to all Windows desktops. Linux and Windows patches will also be released to all systems. Plan on rebooting your Linux or Windows desktop as soon as possible, but no later than Friday, Aug. 19, to finalize the patch installations. If you have any questions or concerns, contact the IT Division Helpdesk at helpdesk@jlab.org or x7155.

New Web Traffic Protections Launch on Tuesday, Aug. 23
Jefferson Lab uses several automated protection systems to scan web traffic for malware and viruses. The protection provided by these scans has become increasingly limited by the expanding use of encryption for web traffic on the Internet. To provide continued security for Jefferson Lab systems, starting on Tuesday, Aug. 23, Jefferson Lab will begin decrypting some web traffic for desktop systems connected via the Desktop 1 and Business Services networks. This will allow the automated processes that the lab has in place to scan this traffic and remove identified viruses and malware. Traffic from known medical and financial institutions, however, will be exempted from being decrypted, as these are generally not sites from which malware and viruses are deployed. If you have any questions or concerns about this process, the CNI group is holding two, one-hour informational meetings in CEBAF Center room F113 at 11:30 a.m. on Thursday, Aug. 18, and Friday, Aug. 19. To determine if your desktop is linked via the Desktop 1 network, visit https://cc.jlab.org/WhatsMyIP from a web browser on your desktop system. If you have general questions about this process, contact the IT Division Helpdesk at helpdesk@jlab.org or x7155. More specific questions should be reserved for the meetings in F113.


Jefferson Lab Travelers and Travel Coordinators: Effective Immediately - Critical New Requirements for All Travel to or Passing through France
Due to increased security levels in France, the U.S. State Department has implemented new requirements for travelers going to or through France. Failure to follow the requirements or provide the requested information could result in denial of country clearance and jeopardize future travel. See the full memo for more details or visit the Jefferson Lab Travel - Foreign Travel webpage for all of the posted information.

Reminder: Options to Save Time, Money in Procuring Materials for Your Next Project
Jefferson Lab offers several opportunities for department and groups to save money in their budgets by using alternate resources to procure items. The next time you need materials for a Jefferson Lab project, check to see if they may be found on one of these locations:

  • The Excess Catalog offers items that are available for re-use;
  • The CMSA metal recycling area provides pipes and other metal pieces available for re-use: To use, fill out a pink sheet or contact Don Brown at x6297 or dbrown@jlab.org; and
  • The GSAXcess website has items that the lab can get for the cost of shipping. You may log in with username GOVUSE and password GOVUSE. If you find an item here, send an email to property@jlab.org with the "Item Control Number."

Lastly, remember that when you plan to move property from one building to another for more than 30 days, you must notify Property Management, so that the item’s location is kept updated; this prevents the reporting of items that have been moved as missing.

Volunteer Opportunity: United Way Day of Caring
The 2016 United Way Day of Caring for the Peninsula will be on Friday, Sept. 9, 8 a.m. - 5 p.m. Jefferson Lab is offering employees the opportunity to volunteer a day of their time to work on a project for one of the participating, local health and human services organizations in Hampton Roads. Typical volunteer positions consist of community enhancement projects that encompass a myriad of activities, such as painting, landscaping and food bank assistance. If you are interested in volunteering your time on Sept. 9 or have questions about the event, email Krystina Serafini at serafini@jlab.org. To volunteer, copy your immediate supervisor on the email, who must concur with your participation, no later than 5 p.m. on Friday, August 26.

Department of Energy Sponsors Food Drive
The Department of Energy is again participating in the "Feds Feed Families" food drive this year. The Thomas Jefferson Site Office (TJSO) will be collecting donations from its federal employees to benefit the Foodbank of the Virginia Peninsula. There is no expectation of Jefferson Lab employee participation in this program, although anyone wishing to contribute may do so. Marked donation boxes for non-perishable food items will be located in the CEBAF Center lobby Aug. 1-19. For more information, see the memo.

Red Cross Blood Drive Scheduled for Tuesday, Aug. 16
The next American Red Cross Blood Drive will take place Tuesday, Aug. 16, 10 a.m.-4 p.m. in CEBAF Center room F113. All participation is appreciated as the Red Cross has a significant blood shortage. To schedule an appointment, visit redcrossblood.org and enter Sponsor Code: TJNAF. You can also schedule an appointment by contacting Johnie Banks at jbanks@jlab.org or x7539. Visit the website for donation eligibility requirements.

Reminder: Hall C Safety Awareness Training Updated
Due to the new configuration of Hall C, the Safety Awareness Training for the hall, SAF112, has been updated. This training will expire on Sept. 1 for anyone who last completed this training before May 1, 2016. To take the updated training, first read the document. Then, sign up for a walk-through, which is conducted on Tuesdays at 2 p.m., by contacting Joe Beaufait at x7131 or beaufait@jlab.org.

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.