Jefferson Lab Weekly Briefs
September 17, 2008
12 GeV Upgrade
The Beam Transport team completed the measurements on the prototype beamline quadrupole magnets. Final design decisions have been made based on the results. The Request For Proposals (RFP) was released for the beam transport quadrupole contract.
Good News! The rebuilt transformer for LN1 is due to be delivered Wednesday, Sept. 17. A tour was conducted for the guests from the International Linear Collider. The dismantling and removal of the Northeast stub equipment and fixtures is going well. Cement bases for surface monuments to be used for alignment of the Hall D infrastructure were installed. The long process of cooling down the End Station Refrigerator and the Central Helium Liquefier began as the accelerator started preparations for beam delivery in a few weeks.
Free-Electron Laser (FEL)
FEL staff members continue to prepare for bringing the FEL up with a final mild water bakeout of the gun. The optics transport control system and the final checkout of the drive laser is nearing completion. A clean pumping on the cryomodules is underway in preparation for cooldown in two weeks.
The EESIC group (Electrical Engineering Support/Instrument & Control) reports that CAMAC to VME conversion of W5 is in the final stages of hardware and software testing. The 2 Kilowatt beam dumps and viewers are the only remaining systems to convert. These will be completed in FY09 due to software priorities and design issues. The 4-Channel to switched electrode electronics (SEE) type beam position monitor (BPM) conversion has been completed successfully. W1 and W3 system conversions are being budgeted for FY09. The Survey and Alignment group has transferred the main accelerator's survey system to the ground surface and is in the process of densifying a new network in support of the Hall D construction. This work has to be completed during this year's summer shutdown, as access to the main accelerator later in the year will not be possible. The desired final accuracy between the existing survey network and the new hall must be less than 1 millimeter.
JLab's Safety Numbers
7 Days since Last Recordable Accident (JLab record: 331)
JLab Calendar of Events
Sept. 17: JLab Colloquium and Public Lecture: Guesstimation
Environment, Safety, Health & Quality
Recently, an attachment cord that was wired incorrectly led to a potential safety incident. A VC-4000 voltage converter was being used during troubleshooting operations, when it was discovered that the hot and neutral cord connections at the back of the unit were reversed (see picture). This effectively bypassed the on-off switch, allowing voltage to be present at the front connections (output) of the unit even when the unit was switched off. Technicians realized the severity of the issue when a spark was seen, and the technicians immediately secured the system. No one was injured.
If you use a voltage converter in your work area, now is a good time to check that the connections were made correctly. Additionally, remember that all electrical work should be done at the lowest possible energy state. If you have questions or if any additional situations are found, contact Todd Kujawa at x7006.
Please also take this opportunity to review work control documents for applicable situations, analyze the hazards and then develop and implement the appropriate hazard controls.
Shield Block Move Lesson Learned
Computing and Networking Infrastructure (CNI)
CEBAF Center Wings A, B & C Network Outage
If your machine has not been registered, it may not be able to rejoin the network following the upgrade. To ensure connectivity, register your individual machines by visiting this link at any time by using a web browser on each machine. If you are unsure about your machine registration, it is OK to register again. If you experience problems with your machine following the upgrade, contact the HelpDesk at x7155.
RedHat Enterprise Linux 3
PRL Editorial Spotlights Physics
School Tools Drive a Success
$4-off Coupons for State Fair Ride Wristband
Tee'em Up for the JLab 2008 Fall Golf Tournament!