Jefferson Lab Weekly Briefs November 10, 2010
Jefferson Lab Weekly Briefs
November 10, 2010
12 GeV Upgrade
Delivery of the niobium cavities for the cryomodules has ramped up, with 34 of the final 86 now onsite. The vendor for the warm helium compressor skids needed for the new Central Helium Liquefier (CHL-2) has taken delivery of the compressors. The first 20 of the radiofrequency system’s waveguide circulators have arrived onsite. The first of the new 2.5 meter curved dipole magnets for the new west spreaders and recombiners have been shipped. Ion pump supplies for beamline vacuum are arriving in quantity.
In Hall C, the Q-weak target was re-installed after repairs to the hydrogen pump. The Q-weak experiment has resumed commissioning and taken some early production data.
Announcing the Outstanding Nuclear Physicist Award
PAC 37 Proposals Due Dec. 1
JSA Postdoctoral Research Prize Nominations Due Dec. 1
The accelerator has been running well, with low trip rates. Day shift on Thursday was spent studying the injector Wien system. Some radiofrequency cavities were recovered during beam studies. On Wednesday, the injector gun high voltage tripped, causing about one and a half hours of downtime. On Saturday, the personnel safety system dropped the beam switchyard to power permit, which affected beam for a couple of hours. Also, rf zone 2L07 misbehaved a few times, causing downtime.
FEL staffers performed a number of interesting studies last week using the ultraviolet FEL. Among other things, the team investigated wiggler pipe and optical cavity mirror metrology system chamber heating at high current, mirror-heating effects from lasing and terahertz, and low-charge (30 picocoulombs), high-charge low-frequency lasing (1 Megahertz, 120 pC electron beam with four outcouplings per gain pass) and macropulsed operation of the beam at 75 MHz. The team also performed difference orbit studies, identifying several locations of orbit errors.
Theoretical and Computational Physics
David Richards, an internationally renowned lattice gauge theorist, has been formally appointed the Deputy AD for Theoretical and Computational Physics. He has been a member of the Theory Center at Jefferson Lab since 1999, and was acting theory director for 12 months, beginning in September of 2009. His new position recognizes his considerable contribution in steering the lab through the DOE four-year national review of theory with great success.
Facilities Management and Logistics
Planning is underway for a power outage affecting all JLab campus buildings outside the accelerator site, excluding the VARC and ARC, for work on the campus electrical distribution system. The outage is currently scheduled to last for nearly the entire holiday shutdown period, beginning at 5 p.m. on Dec. 23 and ending at 6 p.m. on Jan. 2. There will be no power in these buildings during this period. More details will be announced as plans for the outage are finalized. If you have any immediate questions, contact Rusty Sprouse in FM&L, x7589.
Initiatives Fund Awards Announced
JLab Veterans Day Salute on Nov. 11
Order Desserts for Thanksgiving
A Cookie for Your Thoughts
Quark Cafe Offers Thanksgiving Feast on Nov. 17
Sentara Mobile Mammography Unit Onsite Dec. 6
JLab Jackets Available for Purchase
JLab Calendar of Events
JLab's Safety Numbers
15 Days since Last Recordable Accident (JLab record: 331)