Jefferson Lab Weekly Briefs
December 5, 2007
12 GeV Upgrade
The 12 GeV Accelerator Team is making good progress on its Project Engineering Design (PED), with the cryomodule PED somewhat ahead of schedule. The new digital board for the Low-Level Radio Frequency (LLRF) controls has been completed and is undergoing testing. The Beam Transport Team has completed the final design of the quadrupoles and three of the designs for the spread/recombiner dipoles. The Cryogenics Team is on cost and ahead of schedule on its design work. All the teams have started discussions with the JLab procurement staff regarding Advanced Procurement Plans for the planned major contracts to be awarded in FY09.
The DOE Office of Engineering Construction Management (OECM) is holding a review at JLab this week entitled "Earned Value Management System (EVMS) Validation Review." The goal of this review is to provide certification of the Jefferson Science Associates (JSA) EVMS system, and data from the 12 GeV Upgrade project will provide the principal material to demonstrate compliance with the ANSI/EIA-748 EVMS guidelines. Contractor EVMS certification is also a requirement for project baselining or start of construction. The 15-person review committee will hold sessions all week with a review close-out scheduled on Friday afternoon.
In Hall C, the GeP experiment is continuing to take production data, currently measuring polarization transfer in elastic electron-proton scattering at Q2=2.5 GeV2, with a beam energy of 1.87 GeV. During the Thanksgiving shutdown, additional shielding was installed on the GeP electronics bunker and the High Momentum Spectrometer. This shielding has helped reduce radiation-induced crashes of the high-voltage and data acquisition systems.
This one-week period was especially productive for the accelerator, with 288 hours of beam delivery divided among the three experimental halls. When an energy change on Nov. 26 was added in as well as a Central Helium Liquefier trip on Nov. 28 (8+ hours to recover the accelerator back to continuous wave beam delivery), the accelerator performed extremely well. The only major repair was a fix of an underground chilled water leak.
Free-Electron Laser (FEL)
FEL staff is very close to being able to high-voltage process the gun. While the Personnel Safety System is being completed, shielding blocks are in place and temporary interlocks for personnel safety are being used.
Theory Center users from Florida State University and Argonne National Laboratory have recently completed a model calculation of the spectrum of baryons containing one or more beauty and/or charm quarks,arXiv:0711.2492 [nucl-th]. They find that the model reproduces the known charmed and beauty baryons quite well, including the first baryons containing quarks from all three quark families recently discovered at Fermilab. The model also predicts masses for baryons containing more than one heavy quark, although only one unconfirmed candidate exists in this sector.
JLab Calendar of Events
Dec. 6: Lunchtime Holiday Pie Tasting at the Quark Cafe
Environment, Safety, Health & Quality
According to the National Safety Council, hitting an object (person, vehicle, etc.) while driving in reverse is a leading cause of vehicle property damage accidents. As we are busy with holiday shopping and running errands, many of us will be backing our personal vehicles in heavily congested parking lots and garages. Please keep these safety suggestions on vehicle backing in mind to greatly reduce your chance of a serious accident:
Fermilab Drill Bit Lessons Learned
In the second injury, tiny metal slivers entered a worker's palm as he inserted a drill bit into a drill. To prevent injuries like this, it is important to wipe all debris from drill bits after use with a clean cloth or disposable tissue; a spray cleaner or mild oil can be used as necessary. In the third case, a worker lacerated his index finger when a screwdriver drill bit slipped off of a drywall screw. This type of accident can be avoided by using a bit equipped with a magnetic holder and sleeve. For additional information on drill bit use in either hand tools or machine tools, consult JLab ES&H Manual Chapters: Chapter 6120, Hand and Power Tools and ES&H Manual Chapter 6121, Machine Tools.
Computing and Networking Infrastructure
'Tis the season for E-Card Scams
Shredding Service Visit
Children's Holiday Party Volunteers Needed
JLab Children's Holiday Party
Toys for Tots Drive Underway
Ready, Set, Decorate!
JLab's Safety Numbers