JLab Weekly
Briefs
is an ongoing publication providing information on the status of
safety, accelerator operations, experiments, free-electron laser,
reviews, upcoming activities and special events. Deadline for
submission is every Tuesday by 10 a.m. Submit new items to: Public Affairs or contact Kandice
Carter at x7263.
Archives
|
|
Jefferson Lab Weekly Briefs
March 18, 2009
12 GeV Upgrade
Significant progress continues on accelerator construction contracts.
The request for Best-and-Final Offers for the fabrication of the
superconducting radiofrequency cavities is ready to be issued. The BAFO
for the 4m dipole fabrication has been issued. BAFO submittals for the
klystron contract have been received. Responses to the
Request-for-Information for the large magnet power supplies have been
received and discussions have started with some potential vendors. A
modified procedure for testing the higher-order-mode (HOM) damping of
the srf cavities prior to installation in the cryomodules is being
developed; first tests with the improved procedure are expected this
week.
Physics
In Hall A, experiment E06-014, Precision Measurements of the
Neutron d2:
Towards the Electric and Magnetic Color Polarizabilities, ended its run
early Monday morning after accumulating over 80 percent of the
scheduled production data.
After many challenges, the Spin
Asymmetries of the Nucleon Experiment was completed in Hall C. The
experiment
took data with 4.7 and 5.9 GeV beams with the polarized target oriented
both parallel and perpendicular to the beam. The experiment obtained
over 70 percent of the proposed statistics for the more important
perpendicular running and about 40 percent of the proposed statistics
for the parallel orientation. These amounts of data are about what was
expected when the run plan was reworked after the polarized target
magnet was repaired in December. The four SANE spokesmen are Oscar
Rondon Aramayo (University of Virginia), Zein-Eddine Meziani (Temple
University), Mark Jones (Jefferson Lab) and Seonho Choi (Seoul National
University).
Accelerator
During the first three days of last week, the accelerator was down due
to vacuum issues of cryomodule 1L04. Thursday, the vacuum was
better and beamline valves were opened. In order to have a stable
machine, cryomodules 1L03, 1L04 and 1L05 were left off and the
accelerator was reconfigured from 5.9 GeV to 4.7 GeV. By Thursday
evening,
continuous wave beam delivery was resumed, and the accelerator ran well
until Monday morning, when the scheduled down started.
Free-Electron Laser (FEL)
FEL staffers had a great week of running beam with initial tests on
short Rayleigh-range performance. Later in the week, staff conducted a
set of tests on a new edge outcoupler and tested off-axis injection to
the machine. The outcoupler tests were particularly interesting,
providing staff the capability for modestly high-power broadband
radiation out to the limits of transmission of the substrate, 3.86
microns, while showing small signal gains substantially in excess of 60
percent.
Theory Center
A comprehensive study of two-boson exchange (TBE) corrections in
parity-violating electron-proton elastic scattering has just been
completed (arXiv:0903.2759),
in which the intermediate states in loop diagrams are described by
nucleons and Δ baryons. The Δ contribution is found to be
much smaller than the nucleon one at backward angles, but it becomes
dominant in the forward scattering limit. Corrections are computed at
kinematics relevant for recent and planned parity-violating
experiments, such as the HAPPEx, G0 and Q-weak experiments at JLab.
JLab's Safety Numbers
72 Days since Last Recordable Accident (JLab record:
331)
189 Days since Last Lost Workday Accident (JLab record: 676)
JLab Calendar of Events
March 25-27: International
Workshop on Positrons at Jefferson Lab
April 14: 12 GeV Upgrade Groundbreaking
April 14: Science
Series Lecture: Hurricane Hunting
May 2-5: APS April
Meeting in Denver
May 25: Memorial
Day holiday, lab closed
|
Environment, Safety, Health & Quality
Causal Analysis facilitations were recently completed for the Fall
Protection Assessment conducted in November. Jefferson Lab
conducts facilitations to identify underlying problems with
programs, either systemic or functional. The causal analysis results
are then used to identify corrective actions, with the intent of
preventing recurrence. ESH&Q staff also conduct these
investigations for any DOE P-2 finding, which is defined as representing
nonconformances, deviations and/or deficiencies in the implementation
of requirements, procedures, standards and/or regulatory requirements.
For the Fall Protection Assessment, a cross-functional team evaluated
eight separate issues for all potential causes. Each case was then used
to develop a corrective action
plan.
On a separate note, a Safety Award was recently presented to Hui Tian
for her awareness and prompt reporting of a spill in the Test Lab
R&D Chemistry Room. While working in the room, she discovered that
several ounces of a brown liquid had run down the outside face of the
left hood cabinet at waist level and lower. She promptly contacted the
area Safety Warden. It was determined that the spilled liquid was an
acid and cleanup was completed without incident. Hui’s actions to
identify and notify the appropriate personnel prevented users and staff
members from contamination or injury by the spill. This event will be
posted as a Lessons Learned in the coming days.
Computing and Networking Infrastructure (CNI)
E-mail Outage and
Reconfiguration Begins Friday, March 20 at 10 p.m.
The IT division's CNI group will perform a major reconfiguration
of users' e-mail, requiring an outage that will begin Friday,
March
20 at 10 p.m. and last through 3 p.m. on Saturday, March 21. No e-mail
services
will be available during the outage. E-mail sent to JLab addresses from
offsite will queue and be delivered after the outage. Reading or
sending e-mail from within JLab (including webmail and offsite
computers configured to use JLab's e-mail servers) will fail during the
outage.
The location of e-mail folders is being changed. Currently, JLab
account holders have e-mail
folders that are
stored in their home directories (/home/user on Unix or J: drive on
Windows). The reconfiguration will move these folders out of account
holders'
home directories and place them on a standalone, isolated file system.
Account holders will not have direct access to this new file system.
All access
to these folders will require an IMAP mail client (i.e. Thunderbird,
Pine configured as an IMAP client, etc). Further information about this
reconfiguration is available on the CNI
group web page.
Announcements
Pager System Upgrade
JLab is replacing its pager system to improve availability and
reliability. A graded distribution of pagers for the new system will
take place Monday, March 23 through Thursday, March 26. Pagers
currently used
with the old system will no longer receive messages after March 31.
Details about the transition to the new service can be found here.
Last Chance to Enter
JLab's T-Shirt Design Contest!
The deadline for submissions for the 24th Annual JLab T-shirt Design
Contest is Friday, March 20. Submissions should be in color, on
8.5x11 paper and include a front (pocket) and back design. Submission rules
and past
winning designs are posted on the JAG website.
Softball Team First
Practice is Friday, March 20 at 6:30 p.m.
Now is the time to join the JLab softball team. Players of all skill
levels are encouraged to come out and play. The team plays in the York
County Co-Ed Industrial League on Friday nights, April through July. We
accept players age 16+, including JLab employees, Users, friends and
family. For more information or to join, contact Kandice Carter, x7263.
Quark Cafe Celebrates
National Nutrition Month
Test your scale skills every Friday in March. Make a fresh salad from
the salad bar; if you guess the exact price, your salad is on the house!
Quark Cafe's Hot &
Toasty Sandwich Club
Pick up your club card at Dan the Sandwich Man's hot sandwich station
or at the cash register. Get
your card punched with each deli sandwich item priced $3.99 or more and
receive your 11th sandwich free!
Interested in golf?
Come out and join the Jefferson Lab Golf League. The
league will start play March 30 and go through September. Team members
play Monday evenings at Newport News Golf Club, starting at around 4:30
p.m. No experience is necessary. If you are interested and would like
more information, ask one of the people already in the Golf League or
call Danny Machie (x7501). Check out additional details and see who is
already in the Golf League at the Golf
League webpage.
|
Privacy and
Security Not
|
