Jefferson Lab Weekly Briefs March 14, 2012
Jefferson Lab Weekly Briefs
March 14, 2012
12 GeV Upgrade
The Hall A upgrades within the 12 GeV Upgrade Project include improvements to the Compton and Moeller polarimeters to handle operation at 11 GeV and a remapping of the beamline dipoles and the reference dipole at the higher magnetic fields. The new quadrupole magnet required for the Moeller polarimeter has been designed and is being readied for procurement. The first components of the upgraded Compton polarimeter have been ordered.
After eight days of commissioning a new and complex beamline and target, as well as calibration of the magnetic optics for the spectrometer, Hall A started taking production data on the first kinematics point of the GEp experiment over the weekend. The experiment is now well underway.
In Hall C, the Q-weak experiment continued to take production data with 180 microAmp beam on the liquid hydrogen target.
Users Group Town Hall
Minority Undergraduate Research Assistantship
The beginning of the week saw work on beam position monitors and other beam diagnostic equipment getting Hall A ready for the commissioning of the g2p chicane. The initial attempt of steering the beam through the chicane was not fruitful. Investigation showed measured magnet currents to be slightly different than that indicated by the power supply. With that information in hand by midweek, accelerator operators had beam through the chicane, the target magnet and into the high power dump. Midweek also had Hall B coming back up from target work. Hall C continued high-current running throughout the week. On Thursday, a radiation monitor failed in Hall B, preventing beam delivery until it was replaced and certified. Separate instances of beam energy instability were attributed to work on the master oscillator driveline in one instance and to a loose connector in the other. The work on the driveline was stopped and the connector was tightened. The weekend saw smooth running to all three halls with no major interruptions.
The FEL team continued efforts to optimize operation of the infrared FEL in preparation for some new infrared mirror tests. The machine lased on several days with stable, high-current operation and excellent gun performance. Installation of the ultraviolet wiggler chamber encountered some difficulties due to the failure of welds on some internal supports, but a workaround was found to put the project back on track. JLab hosted the ICFA Future Light Source 2012 workshop focused on the science and technology of next generation X-ray user facilities, with around 150 international attendees for the week.
JLab Calendar of Events
March 15: JLab Colloquium and Public Lecture - Bob McKeown
Environment, Safety, Health and Quality
JLab to Participate in Statewide Tornado Drill on Tuesday, March 20
Members of the JLab community who aren't involved in critical activities are asked to participate in the drill by taking cover in a designated "take cover" location as soon as they are notified. The message will be conveyed via JLab email, page, voice and the lab's new Tornado Warning Siren. For more information about JLab's Tornado Response Procedure, visit ES&H Manual Chapter 3510, Appendix T-3.
Computing and Networking Infrastructure
CNI Maintenance Day Set for Tuesday, March 20, 5-7 p.m.
Information Technology Division
Planned CLASDB Upgrade
A new version of the server already exists, with a copy of all the CLASDB tables. The name of the new server is CLASDB-1. CLAS users directly involved may test CLASDB-1 to report any problems, and so the transition will be transparent. Currently, a1c, gemc, the logbook and the wikis are successfully tested. At the time of the transition, the old CLASDB will be turned off and CLASDB-1 will be renamed CLASDB. For more information, visit the Computer Center web page.
Vote for Your Favorite JLab 2012 T-Shirt Design Today!
Volunteers Needed for May 19 JLab Open House
Webinar on Tech Transfer Statement Writing Offered Thursday
JLab Colloquium: Neutrino Oscillations
12th FLUKA Course Offered at JLab April 30 - May 4
Shred-It Truck Stops at JLab on March 16
GTS-Welco Users Meeting Set for March 20
JLab Publications Seminar
Education Seeks Projects for Summer Honors Interns
Tracking Thomas at JLab
Congratulations this week go to Doug Higinbotham and Susan Brown, who were the first to correctly identify the March 7 location. Honorable mentions go to Marcy Stutzman, Michael Haddox-Schatz and Jim Boyce. Check out the Tracking Thomas webpage for a better view of his last location and this week's new mystery photo.