Jefferson Lab Weekly Briefs
August 12, 2009
12 GeV Upgrade
The first components for the upgrade of the accelerator have been received; they will be used in the instrument air system of the upgraded cryogenics plant. The order has been placed for components to be used in the controllers for the stepper motors that will adjust the resonant frequencies of the accelerating cavities. Responses to the Request for Proposals (RFP’s) for cryomodule cold tuners, vacuum vessels and space frames are under evaluation. Similarly, the RFP responses for the isolators to be used in the radiofrequency system (RF) are being evaluated. Responses to the Request for Information have been received for the warm compressors to be used in the cryogenics system upgrade.
The Scheduled Accelerator Down is wrapping up. The Personnel Safety System certification was completed, with a few things identified. An RF module C50-9 was installed at 1L04. High-current, continuous-wave beam (199 microAmps) was set up to the injector inline dump over the weekend.
The FEL ran well all last week. Staffers exposed surrogate out-coupler mirrors to 1.06 micron fundamental and harmonic radiation; the transmitted and reflected power was recorded as a function of time for several irradiances. These mirrors were produced by Carmen Menoni and her team at Colorado State University under a Joint Technology Office-Multidisciplinary Research Initiative contract. The Gun Test Stand gun is being high-voltage processed with krypton gas. Preliminary results at 200 kV show improvement in processing the field emitter. FEL staffers successfully certified the Laser Personnel Safety System in user lab 6, so that beam can be brought into the lab to test stability of delivery.
Quark and gluon propagation and hadronization in the nuclear medium provides an experimental probe of the dynamics of color confinement, which forbids a quark or gluon appearing in the final state of a scattering experiment. A comprehensive review article <arXiv:0907.3534 [nucl-th]> outlines recent experimental and theoretical progress in the study of the nuclear modification of parton propagation and hadron production. It covers, in a unified way, high-energy deep inelastic lepton-nucleus scattering, proton-nucleus and heavy-ion collisions, as well as Drell-Yan processes in hadron-nucleus collisions, and provides a preview of new facilities and experiments.
JLab's Safety Numbers
28 Days since Last Recordable Accident (JLab record: 331)
JLab Calendar of Events
Aug. 13: Amazing Caves in 3D lunchtime presentation
Environment, Safety, Health & Quality
Since mid-June, there have been four reported insect stings at JLab. Although seemingly minor, these types of events are painful, and, if you're allergic, could cause a problematic reaction.
The stings have occurred at various locations across the site, mostly in the fenced area. The main concentration of wasps and bees is in the wildflower areas behind the accelerator service buildings. These areas are near roadways and walking paths, thus stinging insects may be encountered more frequently. Regardless of where you are, stings may be prevented with the following basic information:
If you are stung by an insect during normal business hours, report immediately to Occupational Medicine for treatment. If onsite after normal business hours, immediately apply ice and then clean the area with soap and water. Ensure the incident is reported to Occupational Medicine the next business day. Additionally, if you are stung onsite after hours and have a known history of serious allergic reactions, seek care at an emergency clinic.
Computing and Networking Infrastructure
Sprint Cell Phone Coverage Extended
Helpdesk Summer Hours Ending
Amazing Caves in 3D
Identity Theft: What Is It and How Can We Protect Ourselves?
JAG Luau Set for Wednesday, Aug. 19