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.
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)
JLab Calendar of Events
July 1: Due date for several physics award applications
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
Network Outage on Saturday, July 11, 8 a.m.-1 p.m.
American Red Cross Blood Drive
Calling all CEBAF History Buffs!