Jefferson Lab Weekly Briefs June 4, 2008
Jefferson Lab Weekly Briefs
June 4, 2008
12 GeV Upgrade
A series of wire-plane winding tests were carried out at the Indiana University Cyclotron Facility in preparation for a full-scale prototype of a Hall D Forward Drift Chamber plane. These wire packages, circular in shape and nearly one meter in diameter, are made from a light-weight fiberglass/foam composite and support the tension of nearly 200 wires. Located on either side of these wire planes are very thin cathode strip planes that image the charge seen on the wires during an electron avalanche caused by a passing charged particle. Minimizing the material in the active portion of the detector has been the main goal, to minimize the photon conversion and reduce the uncertainty of the momentum reconstruction.
As the scheduled accelerator down period is approaching, the accelerator is operating at a high rate of efficiency. The three experimental halls divided 370 hours of beam delivery. Among the week's highlights were periods of 100 microamp beam to Hall C and more than eight hours of Accelerator Operations beam test plans successfully accomplished. The only significant problem encountered was a glycol chiller system malfunction, which was fixed promptly by staff members.
Free-Electron Laser (FEL)
The FEL received funding from the Office of Naval Research to cover work for the rest of the fiscal year. The FEL team is grateful to all who provide support for its continuing efforts. On the technical side, the first sextupole was installed in the beamline, and FEL staff members verified proper operation of the gun test stand sulfur hexafluoride (SF6) safety valve. In addition, several team members participated in the FEL Technology Area Working Group at Argonne National Lab. Staff members worked on committees looking at the technology status of optics, injectors and beam transport.
The Personnel Safety System group and Instrumentation and Controls group participated in a Design and Status Review for the 12 GEV project. Also, the 12 GeV klystron specification has been passed on to Project Management for final signatures.
E-Waste Recycling Event at ODU on June 7
JLab's Safety Numbers
259 Days since Last Recordable Accident (JLab record: 319)
JLab Calendar of Events
June 2-13: DOE ES&H Inspection - Onsite Inspection Visit
JLab Education Calendar
Environment, Safety, Health & Quality
With temperatures already rising into the 90s, it's a good time to emphasize some basic information about "beating the heat" both at JLab and at home. Remember that heat sensitivity is affected by age, weight, fitness condition and other medical conditions. Follow these tips to stay cool:
Computing and Networking Infrastructure
JLab Auger/PBS Fedora 8 Compute Farm in Production
Adobe Flash Player Plugin Upgrade
Scheduled Maintenance Period, Tuesday, June 10, 5-10 p.m.
For a complete list of items that will be affected during this maintenance period, visit the Computer Center Maintenance Schedules page.