Jefferson Lab Weekly Briefs September 8, 2010
Jefferson Lab Weekly Briefs
September 8, 2010
12 GeV Upgrade
The status of detector systems for the Hall C Super High Momentum Spectrometer was reviewed at a day-long meeting on Aug. 26. Over half of the slats for the three scintillator hodoscopes are assembled and being tested. Procurement of the bars for the quartz hodoscope is progressing. Preparations are underway for the heavy gas Cerenkov counter. The support frame for the pre-shower part of the lead-glass calorimeter has arrived and is being readied for stacking of the modules. The production drawings for the spectrometer support structure now incorporate a 20-ton weight reduction after further study of the deflections when loaded with the magnets.
In Hall B, a new record was established for the polarization of deuterons using JLab's Frozen Spin Target, FROST. Following the successful completion of the g9b experiments in Hall B, the JLab Target Group replaced the polarized proton target material with a deuterated version doped with OX063, a paramagnetic trityl radical developed by the medical imaging community. Deuterons in 1,2-propanediol-D8 were dynamically polarized at 5 Tesla and 200 millikelvins to a record level of approximately 87 percent.
AIP State Department Fellowship Application Deadline is Nov. 1
Accelerator Operations staffers are edging closer to locking up the tunnel during the day, although there is still a lot of work being done in every area of the tunnel. Alignment checks in the injector have been completed. Injector gun2 was successfully raised to 150 kilovolts for testing and data collection. Cryomodules 2L15 and 2L16 were cooled down without any problems. Arc 10 stands continue to be installed and aligned with forms for their grout work being set in place. Power factor correction capacitor maintenance and transformer oil sample taking continue. Upgrades to the fire system for the MCC, North and South Linac service buildings were installed. A YAG viewer was installed at 2C04. The site was cleaned up and equipment stored away in preparation for Hurricane Earl. Personnel Safety System certification began Friday in the halls and beam switchyard; on Monday, the South Linac was completed, with the exception of the radiation monitors, placing certification ahead of schedule.
Last week, the FEL lased in the ultraviolet for the first time. The team also made excellent progress in characterizing the performance of the laser. Initial lasing on this first UV mirror set was at 408 nanometers, with 100+ Watt power levels, corresponding in round numbers to 20 microJoules per pulse at 5 Megahertz. The laser seemed robust and stable. The operators quickly tuned down as far as 363 nm. Importantly, the 3rd harmonic of 372 nm (124nm) corresponds to a photon energy of 10 eV, and brightness levels are sufficient to support cutting-edge scientific programs.
JLab's Safety Numbers
9 Days since Last Recordable Accident (JLab record: 331)
JLab Calendar of Events
Sept. 20: Safety Shoe Vendor onsite
Environment, Safety, Health & Quality
Maximo Requisition System Change Regarding Selection of Vendors for Class A or B Welding
Additionally, below the initial question, there is a link to an approved vendor list. This list contains vendors that have been pre-qualified to perform these types of welding and brazing operations. If you notice that a preferred vendor is not on the list, contact Danny Lloyd, x7121.
Further questions about this process and the Quality Assurance oversight of welding processes for purchased services/material may be addressed to Michael Martin, x5515, or Bruce Lenzer, x7586.
Computing and Networking Infrastructure
Major Systems Outage on Saturday, Sept. 18
Patent Your Bright Ideas at JLab
Video of All-Hands Meetings
Performance Appraisal Update