Jefferson Lab Weekly Briefs May 12, 2010

Jefferson Lab Weekly Briefs
May 12, 2010

EEL Parking Lot Closed Thursday-Sunday

Paving Operations are set to begin in the EEL parking lot. The lot will be closed for parking of all vehicles Thursday-Sunday. On Friday, the lot will be closed to all traffic, including shipping and receiving deliveries, golf carts and shop vehicles. If all work is completed on time, the lot will re-open Monday morning. Once open, the lot will be accessible via BCS Road. Enter the lot carefully and be alert to the new traffic pattern, since parking space placement will have changed. For more information, see the detailed announcement and parking map online.

12 GeV Upgrade

The sixth (of 37) 4-meter dipole magnet has been received. Deliveries of the new beam transport quadrupole magnets have reached 66; all magnets that have been tested have been significantly better than the specifications. Preliminary testing of the first article klystron by the vendor has begun. Deliveries continue for the cryomodule cold tuners and waveguides; the contract for the warm tuner assemblies has been awarded. The vendor for the iron assemblies to be added to the existing beam transport dipoles has ordered the necessary materials. Critical sub-contracts for the 4.5K coldbox (turbines and absorbers) were placed by the coldbox vendor. A preliminary manufacturer’s engineering review was held at the vendor site for the Central Helium Liquefier warm compressors, and the design was approved. The vendor subsequently placed orders for electric motors, compressors, heat exchangers and coolers.


Overall, the accelerator has been running well, with low trip rates. On Thursday, the CHL tripped, causing more than six hours of downtime. The cause of the trip is still under investigation. On Friday, the injector laser spot was moved to boost the quantum efficiency. Over the weekend, Hall B beam showed some instability. On Monday, the orbits from the injector to Hall B were optimized, which stabilized Hall B beam current and positions.

Free-Electron Laser

The FEL team ran beam experiments for two user groups last week in terahertz and infrared, testing the performance and stability of the FEL and optical transport. The team also ran some injector halo tests.

Theory Center

Researchers from JLab and Trinity College, Dublin, have computed the excited spectrum of mesons using lattice QCD. The latest results <arXiv:1004.4930> include the identification of states with exotic quantum numbers, a vector-hybrid candidate and many high-spin states (up to spin-four). The next steps are to develop methods for dealing with two-particle states before eventually calculating meson-photon couplings. This program of calculations will inform expected production rates at GlueX, as well as providing the ab initio predictions for the meson masses demanded by experiment.

JLab's Safety Numbers

14 Days since Last Recordable Accident (JLab record: 331)
57 Days since Last Lost Workday Accident (JLab record: 676)

JLab Calendar of Events

May 12: JLab's 25th Annual Run-A-Round
May 26: Colloquium and Public Lecture
May 27: Safety Shoe Vendor onsite
May 31: Memorial Day holiday - JLab closed
June 1 - June 18: Hampton University Graduate Studies Program
June 2: Tidewater Regional Fire Academy Graduation
June 7-9: JLab Users Group Workshop and Annual Meeting
June 24: Safety Shoe Vendor onsite




Environment, Safety, Health & Quality

Hand Safety - Your hands are your most important tool!
More than 16 million people suffer hand injuries every year, with hand injuries accounting for a full quarter of all industrial injuries. Most hand injuries involve a lack of adequate personal protective equipment, and many injuries involve improper maintenance or improper use of a tool, including use of unprotected or faulty machinery or equipment, failure to use guards and kill-switches, and failure to follow appropriate lock-out procedures. Wearing jewelry, gloves or loose-fitting clothing around moving parts can also lead to injury.

Protect your hands from injury by following these guidelines:

  • Inspect equipment & machinery before (and after) tasks to make sure that it is in good operating condition.
  • Be alert to potential hand hazards before an accident can happen.
  • Select the proper tool for the job.
  • Be alert to possible unguarded pinch points and always use guards, shields and other protective devices when appropriate; do not remove guards.
  • Use brushes to wipe away debris for an unobstructed view of the work area.
  • Never wear gloves, jewelry or loose clothing when working with moving machine parts.
  • Use the appropriate personal protective equipment. When wearing gloves, be sure they fit properly and are rated for the specific task you are performing.
  • Disconnect power and follow established lock-out procedures before repairing or cleaning machinery.

Computing and Networking Infrastructure

Jlabs2 Decommissioning
As part of the CNI group's ongoing effort to move away from general Solaris systems, the group is decommissioning as of Tuesday, May 18, at 5 p.m. Users that still require access to Solaris systems may use jlabs3. Please note that jlabl1, jlabl2, and jlabl3 will remain available for general purpose computing needs. If you have any questions, contact the IT helpdesk at x7155.


Get Your Race Bib or Register for the Run-A-Round
Registered runners can pick up their race bib and non-registered runners can register at a non-award late registration session for the 2010 JAG Run-A-Round today in the CEBAF Center lobby until 2 p.m. Reminder: the T-shirt unveiling ceremony will begin at 2:30 p.m. The race is set to start promptly at 3 p.m. A race map and more information can be found on the JAG webpage.

Only Two TIAA-CREF Counseling Sessions Left!
TIAA-CREF will offer individual counseling sessions onsite on May 20-21. In these sessions, employees can discuss their personal financial situation with a TIAA-CREF consultant on a confidential basis. To discuss your plan and options for managing your retirement savings or to schedule an appointment with a TIAA-CREF Individual Consultant, call TIAA-CREF at (800) 732-8353, M-F, from 9 a.m.-8 p.m.

Clean the Bay Day Seeks Volunteers
The Chesapeake Bay Foundation invites the general public to participate in its annual Clean the Bay Day. The event will be held 9 a.m.-noon on Saturday, June 5. For more information and to register, visit the foundation's website.