Jefferson Lab Weekly Briefs June 6, 2012
Jefferson Lab Weekly Briefs
June 6, 2012
12 GeV Upgrade
The installation plans of the 12 GeV Upgrade team have been integrated into the lab-wide integrated schedule for the long shutdown, and monthly progressing has started. As installation activities increase in the completed conventional facilities, weekly meetings with Facilities Management and Logistics ensure coordination and support. The 12 GeV Upgrade project has finalized all transportation, material handling equipment, space, storage and waste/recycle needs. Evaluation of needs will be updated throughout the shutdown.
The removal of the Q-weak experiment continues in order to ready Hall C for Super High Momentum Spectrometer installation. Most of the shielding blocks for the electronics bunker (dog house) and around the Qtor power supply have been removed from the hall. As-found alignment surveys of the experiment are being done and have included measurements of the Compton Polarimeter, beamline elements and the Q-weak quartz bars.
Summer Lecture Series 2012 Calendar Posted
This week saw the first full week of running beam for the Polarized Electrons for Polarized Positrons (PEPPo) experiment. The injector region ran fine during the week, supporting PEPPo beam and detector commissioning. On Friday, a high temperature on a helium compressor caused a shutdown of the Central Helium Liquefier, pausing the experiment for a short while. On Friday night, a tornado spun things up in nearby Hampton. The first actual use of JLab's outdoor siren prompted staff to seek shelter below ground in the North Linac stairwell. Once given the "all clear," they emerged to find no damage, allowing them to quickly recover the accelerator and restore the beam. The weekend saw instabilities in the spectrometer magnet power supply for PEPPo. Electrical Engineering Support (EES) came in and changed out the power supply, but the instabilities continued somewhat at a rate that could be managed manually. As the new week was starting, the radiofrequency capture cavity, which provides the initial acceleration of the beam from 130 KeV to 500 KeV, began to exhibit instabilities. EES-RF staffers were able to re-tune the resonance control of the cavity to bring it under control.
The FEL team set up the system for lasing in the ultraviolet for the planned vacuum-UV user experiment next week. Work to install and set up the DarkLight apparatus is ongoing.
The Mechanical Systems Installation and Vacuum groups are two weeks into the down for the 12 GeV Upgrade and have made excellent progress. The vacuum group has completed labeling components, venting and beamline removal for the east recombiner, west spreader, west extraction, transport channel, North Linac and the 45 MeV dump. In addition, five warm region girders (component girders between cryomodules) have been rebuilt for the North Linac. Work continues with girder modifications and rebuilds in the vacuum lab and beamline removal in the beam switchyard. The Installation group has removed the 45 MeV dump and its shielding, disconnected the low-conductivity water system, girders and dipole magnets in the east recombiner and west spreader. The warm region girders in both the North and South Linac have been removed to support the 12 GeV cryomodule installation. As of June 4, a total of 20 girders and 15 dipoles have been removed from the machine.
Facilities Management and Logistics
JLab Energy Reduction Annual Test Set for Thursday, June 14
JLab Calendar of Events
June 4-6: JLab Users Group Workshop and Annual Meeting
Environment, Safety, Health and Quality
Beat the Heat for Health
"For outdoor workers, 'water, rest and shade' are three words that can make the difference between life and death," said Secretary of Labor Hilda L. Solis. "If employers take reasonable precautions, and look out for their workers, we can beat the heat. It is essential for workers and employers to take proactive steps to stay safe in extreme heat, and become aware of symptoms of heat exhaustion before they get worse."
JLab Preps for Hurricane Season: June 1-Nov. 30
Computing and Networking Infrastructure
Critical Windows Security Patch Planned for Tonight
Email Migrations into New System Continue
JLab Target of Intense Phishing Activity: Be Vigilant; Report Suspicious Emails
Foreign Travel Order 551.1 Revision Q&A Sessions Offered
6 GeV End of an Era Party June 6 for Lab Staff, Students & Users
Education Seeks Projects for Summer Honors Interns
Tracking Thomas at JLab
Congratulations this week go to Michael McCaughan, who was the only person to correctly identify the May 30 location. A special thank you to Rob Mahurin, who helped to get Little Thomas into last week's location. Check out the Tracking Thomas webpage for a better view of his last location and this week's new mystery photo.