• Wed, 02/03/2016 - 3:49pm

    Jefferson Lab Weekly Briefs
    February 3, 2016

    12 GeV Upgrade

    The main support legs have been installed on the Torus magnet for CLAS12 that is being assembled in Hall B. The weight of the magnet has been transferred to the legs, following which the assembly “spit” and its two blue support stands have been removed. Next steps include a detailed survey and then adjustment of the positions of the magnet coils proper, relative to the vacuum jackets. Once this is complete, the thermal shield and hub cryostat can be added to the currently exposed cold hub at the center of the magnet. The Torus Service Tower will be added at that point. It supplies cryogens to the magnet and also serves as a cooled conduit for the two main power leads and for the various instrumentation wires coming from the magnet internals and measuring pressures, temperatures and voltages across splices. The Distribution Can for cryogens, which acts as the interface between both magnets and the End Station Refrigerator, is undergoing final manufacturing checks at the vendor in Chicago. The in-field checkout has begun for the control logic and instrument readouts for the magnet, and ordering, testing and installation of the various parts of the vacuum pumping system is well underway.

    The vendor for the Solenoid magnet for CLAS12 has epoxy-impregnated both of the two “Intermediate” coils. Preparations and trial runs are underway for the major subsequent step, which is cooling the two Inner coils and then inserting them into machined cavities in the winding bobbin for the Intermediate coils to form the main four-coil winding pack for the Solenoid. The bobbin for the fifth, or “Shield”, coil has been delivered to the vendor and set up on the winding machine. Insulating layers and the guide pieces for the power leads are being attached to this bobbin, after which the Shield coil will be wound and then epoxy-impregnated. The parts for the Solenoid cold mass assembly are on order in anticipation of the next step in Solenoid assembly after Shield coil winding is complete. In this step, the five coils are joined into one assembly by suspending the bobbin with the four Inner and Intermediate coils inside of 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, which is being procured.

    Physics

    Jefferson Lab Published Journal Articles, Jan. 25-29

    • E. Chudakov, S. Gevorkyan, and A. Somov. "Photoproduction of omega mesons off nuclei and impact of polarization on meson-nucleon interaction." Phys. Rev. C 93, 015203.

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

    Publications Refresher Course Offered Feb. 23
    The next Publications Training and Refresher course will be held on Tuesday, Feb. 23, at 9 a.m. in CEBAF Center room F224-225. A brief introduction to the Department of Energy's Public Access Plan and how it affects Jefferson Lab will be presented. In this session, authors will learn how to submit manuscripts to the Publications Review and Approval System, how to make recommended revisions to papers during the signature process, and how to add the relevant information once the paper is published. If you would like to attend, R.S.V.P. to Kim Edwards by Friday, Feb. 19.

    Apply Now for the Graduate Fellowship Program at Jefferson Lab
    JSA is now accepting applications for the JSA/JLab Graduate Fellowship Program for the 2016-2017 academic year. Each fellowship will provide the awardee's home institution with a $10,000 stipend. The awardee's home institution must agree to provide the remaining research assistant stipend from institutional or research funds. An additional $2,000 supplemental stipend is provided to the awardee's home institution for the graduate student. Conference travel support is also available for use during the fellowship period. The JSA/JLab Graduate Fellowship Program is funded by the JSA Initiatives Fund. Application materials are due by Feb. 29. Visit the website for an application form and application requirements. If you have any questions about the program, contact Elizabeth L. Lawson at elawson@sura.org.

    JSA Offers Sabbatical and Research Leave Support at Jefferson Lab
    JSA is now accepting applications for the JSA/JLab Sabbatical and Research Leave Support Program for the 2016-2017 academic year, with support beginning as early as summer 2016. The program is funded by the JSA Initiatives Fund. Application materials for the program are due by March 31. Visit the website for an application form and proposal requirements. If you have any questions about the program, contact Elizabeth L. Lawson at elawson@sura.org.

    JSA Thesis Prize Call for Nominations
    Theses completed during calendar year 2015 are eligible for the 2015 JSA Thesis Prize, as well as theses completed during the last quarter of 2014 (if they haven't been submitted before). This project is supported by the JSA Initiatives Fund Program, a commitment from the JSA owners, SURA and PAE Applied Technologies. Initiatives Funds support programs, initiatives, and activities that further the scientific outreach, promote the science, education and technology of the Jefferson Lab and benefit the lab's extended user community in ways that complement the lab's basic and applied research missions. The nomination deadline is Feb. 15. For nomination package details and submission instructions, see the webpage linked above.

    2016 L’Oréal USA For Women in Science Fellowship Program Now Accepting Applications
    The 2016 L’Oréal USA For Women in Science fellowship program is now accepting applications. The application and more information about the L’Oréal USA For Women in Science program can be found at www.lorealusa.com/forwomeninscience. Applications are due Friday, Feb. 5.

    Center for Theoretical and Computational Physics

    The Jefferson Lab Angular Momentum (JAM) Collaboration has completed a comprehensive new global QCD analysis of polarized deep-inelastic scattering, including the latest data on polarization asymmetries from Jefferson Lab. The analysis is performed using a new iterative Monte Carlo fitting technique which generates stable fits to polarized parton distribution functions (PDFs) with statistically rigorous uncertainties. Inclusion of the Jefferson Lab data leads to reduced PDF errors for the valence and sea quarks, and for the gluon at large momentum fractions, and provides the first detailed extraction of the twist-3 PDFs describing chromo-electric and -magnetic forces in the nucleon.

    Engineering

    The Survey and Alignment group has been busy. Hall D's polarimeter was calibrated and aligned and the target/spectrometer were checked and aligned. In Hall C, the dump monument control was updated to support the installation of the new dump, and the 12 GeV components were aligned for final alignment. For Hall B the following work was completed or being worked on: the PRad target vessel was fiducialized and prealigned; the survey monuments were leveled to the upstream beam switchyard; the Low Threshold Cherenkov Counter and Panel 2A supports were measured and are being aligned; the torus was measured and checked prior to the spit being removed; and the Heavy Photon Search experiment components were aligned for weekend runs. For Hall A, the Gas Ring Imaging Cherenkov detector was inspected. Finally, after the accelerator was opened, a complete survey of the survey network was carried out to monitor tunnel movements.

    Environment, Health, Safety and Quality

    Bypassed Safety Features
    Recently, two Occurrence Reporting and Processing System reports from the Department of Energy were similar in nature but slightly different. In both cases, if one more safety lock had not be in place, serious injuries could have easily occurred.

    So what can Jefferson Lab learn from these events? One lesson is to work only on systems for which you are currently trained and authorized. It is imperative that one know what a lockout really controls and whether other systems can still affect where you are working. Before you begin working on a system, make sure you are familiar with the system and that you verify that each lockout is in place to protect yourself and your coworkers. Finally, never ignore or bypass any warning signs on equipment.

    Computing and Networking Infrastructure

    Jefferson Lab Wireless Outage
    On Tuesday, Feb. 9, beginning at 5:30 p.m., there will be a brief outage of wireless networking throughout the Jefferson Lab campus while access points are upgraded to the latest firmware. The wireless networks should be functioning normally again by 7 p.m. Questions or concerns about this outage should be directed to the IT Division Helpdesk, helpdesk@jlab.org or x7155.

    Computer User Account Request Form Online Feb. 10
    On Wednesday, Feb. 10, the Jefferson Lab Computer User Account Request form will change to an online form. The IT Division Account webpages will be updated on that date to reflect the new procedure for obtaining a computer user account. In the meantime, if have any questions or concerns regarding this change, contact Jessica A. Perry, x7262.

    User Account Audit Beginning Feb. 15
    The annual Computer User Account Audit will begin on Monday, Feb. 15, and end on Monday, March 14. All supervisors and sponsors of users with computer accounts at Jefferson Lab are required to review and re-authorize these accounts annually. This audit is a critical part of maintaining an appropriate level of cyber security at the laboratory. If you sponsor someone with a computer user account at Jefferson Lab, you will receive an email on Feb. 15 with information on how to complete your user audit. If you have any questions or concerns regarding the audit, contact Chris Williams, x6245, or Jessica A. Perry, x7262.

    Announcements

    Main Sidewalk from CEBAF Center Circle to TED is Closed to All Pedestrians until Further Notice
    To facilitate contractor excavation work that is underway and to ensure the safety of workers and members of the Jefferson Lab community, the main sidewalk stretching between the CEBAF Center Circle and the front of the TED building (Bldg. 55) is closed. It is currently a construction zone. Several individuals have been stopped while walking on the sidewalk or trying to walk around the construction fencing. Everyone is asked to pay attention to the barriers, heed the posted signs and stay off this section of sidewalk. Questions regarding this work may be directed to Michele Solaroli, x7751 or solaroli@jlab.org, or to Russell Mattox, x7477 or rmattox@jlab.org. Read the full memo at the link.

    Quark Cafe Offers Special Menus for February Events
    The Quark Cafe is offering several special menus for events in February. Pick your side before the Big Game by opting for a Denver Mile High sub or a North Carolina pulled pork BBQ sandwich on Friday, Feb. 5. Celebrate the Chinese New Year on Monday, Feb. 8, with General Tso's chicken or vegetable tofu with fried rice and sides. Parade through CEBAF Center on Fat Tuesday, Feb. 9, for seafood, chicken and andouille sausage creole or a muffaletta. And show you Feel the Love on Thursday, Feb. 11, with roast tenderloin of beef served with lemon asparagus and lobster mashed potatoes, a sumptious pasta primavera, or an oyster po' boy.

    Science Series: What Every Dog Should Know About Quantum Physics
    Chad Orzel, physics professor & author of popular science books and blogs, will present “What Every Dog Should Know About Quantum Physics” in a Science Series lecture set for Tuesday, Feb. 9, at 7 p.m. in the CEBAF Center auditorium. The lecture is free and open to the public. In his talk, Orzel will discuss quantum physics, the science of extremely small things like atoms and subatomic particles. He’ll explain the reality behind some of the stranger aspects of quantum physics, and why it is so important that even dogs should know about it. See the webpage for more information.

    JAG Dog Training Club to Kick off New Session at the Feb. 9 Science Series Talk; Training Classes to Begin on Feb. 23
    The JAG Dog Training Club will kick off its 2016 Therapy Dog/Canine Good Citizen class on Tuesday, Feb. 9, at the special Science Series Lecture, "What Every Dog Should Know About Quantum Physics." No dogs at the lecture, please! Training classes with dogs will begin on Tuesday, Feb. 23, at 7 p.m. in the Support Service Center lobby, Building 28. For more information about the JAG Dog Training Club, contact Joyce Miller at x7163 or miller@jlab.org.

    Jefferson Lab Entrance Closure on Feb. 15: Lawrence Drive
    Hampton Roads Sanitation District is installing a 30” sewer force main on Department of Energy property adjacent to Jefferson Avenue. One section of the line will be installed just outside the accelerator site fence and along Jefferson Avenue. Then, installation will proceed under Lawrence Drive from the intersection of Lawrence and Jefferson Avenue and will stretch all the way to Hogan Drive. Beginning Feb. 15, the Jefferson Lab entrance at Lawrence Drive and Jefferson Avenue will be closed for two months for installation of the new force main. All traffic will enter and exit Jefferson Lab via Hogan Drive during this period. If you have any questions about this work, contact Rusty Sprouse at x7589.

    Jefferson Lab Calendar of Events

    Feb. 6: Va. Regional High School Science Bowl
    Feb. 9: Science Series: What Every Dog Should Know About Quantum Physics
    Feb. 18: Colloquium and Public Lecture: Tunnel Visions by Micheal Riordan
    Feb. 18: GlueX 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.