Jefferson Lab Weekly Briefs July 1, 2009

Jefferson Lab Weekly Briefs
July 1, 2009

12 GeV Upgrade

Preparations for the Hall B CLAS12 drift chamber mechanical construction are ongoing. Drawings for the Region-II chamber, including strongbacks, stringing machine rails and the tension-testing magnet cart, are in the final review stage, and the start of those procurements is anticipated in about a month. Wire, feedthrough inserts, crimp pins, stringing platforms, bus wire, rubber connectors, plastic plugs and tension-testing magnet wire have already been ordered. A Request for Quotation (RFQ) for all feedthroughs will be issued soon. Existing stringing machines are being refurbished, and Old Dominion University has begun setting up a clean room for Region-II drift chamber construction in its new science building. A wire-quality test chamber is nearly complete and will be tested over the summer.


In Hall A, installation work for the Hall A Proton Parity Experiment (HAPPEx-III) continues.

In Hall B, routine maintenance is ongoing.

Installation work for the High-Resolution Kaon Spectrometer experiment is ongoing in Hall C.


Preparations began for the installation of a C-50 type cryomodule at the NL04 position in the North Linac. The software archiver upgrade was completed and the archiver is online. Maintenance on the box supplies is going well. The 10 MHz radiofrequency system amplifier was replaced while fast shutdown (FSD) cards were checked for proper optical power output. Vibration data was collected on various pieces of rotating equipment for fault analysis. Failed power factor capacitors for the Arc 9 box supply are in the process of being replaced.

Free-Electron Laser

Several runs for users were completed last week on pulsed laser deposition and terahertz, although issues with advanced drive laser stability prevented achievement of several goals. FEL operations were for two shifts daily. The team intends to do some major diagnosis and repair on the system before attempting a Light Pseudoscalar and Scalar Search run.

JLab's Safety Numbers

177 Days since Last Recordable Accident (JLab record: 331)
294 Days since Last Lost Workday Accident (JLab record: 676)

JLab Calendar of Events

July 1: Due date for several physics award applications
July 3: JLab closed for Independence Day
July 14-16: JLab Science and Technology Review
July 24: FEL Photon Science Workshop
July 29: American Red Cross Blood Drive
July 31: Science Education Summer Poster Session




Environment, Safety, Health & Quality

ESH&Q Manual Chapter 6650, Engineered Nanoparticles was recently released. This new chapter and its appendices (Appendix T1 Minimum Mitigation Requirements for Engineered Nanoparticles and Appendix T2 Emergency Procedure for Engineered Nanoparticles) define various criteria for the handling, movement and operations involved with engineered nanoparticles.

An engineered nanoparticle is an intentionally created particle with one or more dimensions. It measures between 1 and 100 nanometers and can be fixed in substrate, suspended in solutions or be unbound.  Additionally, there are no OSHA or EPA regulations for nanomaterials. The field of nanotechnology is rapidly emerging, and much remains unknown about health and environmental effects; therefore, JLab treats engineered nanoparticles as suspect carcinogens.

Currently there is one nanoparticle experiment at the FEL. JLab's requirements for nanoparticle work include training (SAF 119), registration as an Engineered Nanoparticle Worker and following of the Operational Safety Procedure (OSP) put in place.

In general, staff should avoid purchasing products containing nanoparticles until they have consulted with ESH&Q. For more information, contact Jen Williams, x7882.

Computing and Networking Infrastructure

Energy-Saving Setting on JLab Printers
To improve energy efficiency and to meet contract requirements, the energy-saving settings on printers will be verified over the next couple of weeks. Printers found to not have their energy-saving settings enabled will be enabled. This will mean that printers may "go to sleep" more often when they are not being used. If you find that the printer you are printing to seems to be off, just press the power button to wake it up so that it will start printing. By enabling this setting, the lab will save energy.

Network Outage on Saturday, July 11, 8 a.m.-1 p.m.
The CNI group is planning work on the JLab network during the morning of July 11. Users and staff at the lab during this time will experience several short outages, and some portions of the network may experience a brief outage while the group makes some needed configuration changes. Access to the Internet may also be briefly interrupted.


American Red Cross Blood Drive
The next American Red Cross Blood Drive is scheduled for Wednesday, July 29, from 10 a.m. - 4 p.m. in CEBAF Center room F113. New and repeat donors are encouraged to attend. Walk-ins are welcome; however, making an appointment allows the Red Cross to schedule adequate staff for the visit. Volunteers are also needed to help with the blood drive. To schedule an appointment or to volunteer, contact Johnie Banks at x7539 or e-mail

Calling all CEBAF History Buffs!
Do you have or do you know someone who has historic pictures or other high-profile documents about JLab in files that haven't seen the light of day in a decade or more? Public Affairs is collecting homegrown historic information about JLab for the upcoming 25th Anniversary Celebration. If you have any documentation that you think may be of interest, contact JLab Public Affairs at