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.
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Jefferson Lab Weekly Briefs
November 19, 2008
12 GeV Upgrade
JLab jointly sponsored an international workshop on Physics and Methods
in Meson Spectroscopy in Munich Oct. 22 - 24 with more than 80
participants. The workshop encompassed meson spectroscopy with beams of
protons and mesons (CERN-COMPASS), polarized photons (JLab-Hall
D/GlueX) and antiprotons (GSI/FAIR-PANDA). Part of the workshop program
dealt with the new analysis methods presently being developed to make
optimal use of these high-statistics data sets and to improve the
reliability of traditional partial wave analysis. The workshop was a
great success, bringing experts from all over the world together to
discuss this physics and the associated analysis methods. More
information can be found online.
Physics
In Hall C, the Spin Assymetries of the Nucleon Experiment (SANE) is
down because of problems with the superconducting magnet in the
polarized target. After a five-day warmup, the magnet was transported
to the EEL and the top "donut" opened. Unfortunately, no obvious fix
was found. Oxford, the company that built the magnet, quoted six weeks
to assess the magnet. With the time constraints in the beam schedule,
sending the magnet to Oxford would be a delay that wouldn't allow the
experiment enough time to run. So Hall C staff is going to continue studying the magnet at JLab to see if the problem can be isolated.
Accelerator
The accelerator provided 184 hours of beam to the two experimental
halls during this period. The accelerator’s beam availability was
reduced by two significant equipment events related to the Central
Helium Liquefier. A Howden Compressor Oil Pump bearing failed, which
required taking the CHL offline to replace the bearing. Unfortunately,
soon after this problem was fixed, the CHL’s Turbine No.T3 had to be
replaced. This repair effort was further delayed by the discovery of a
faulty turbine seal on the replacement turbine. Once all repairs were
successfully and safely made, the accelerator resumed beam delivery.
Free-Electron Laser (FEL)
FEL staff replaced the gun cathode and completed a short bake
over the weekend. The gun had provided good current, but lifetime on
the cathode was limited by field emission points from the cathode due
to earlier damage. While working on that, staffers also made
significant progress on stabilizing phase noise on the Advanced Drive
Laser.
Theory Center
JLab has already played a major role in the exploration of strange
quarks in the nucleon, providing a large part of the world's data on
parity-violating electron scattering. For lattice QCD, the measurement
of strange quark contributions involves so-called disconnected
diagrams, which have proven extremely hard to measure. Indeed, the best
determinations of the strange electric and magnetic form factors have
come through indirect means. In recent work (arXiv:0811.1779 [hep-ph]),
led by colleagues at the University of Kentucky, state-of-the-art
methods were used to establish that the strange and anti-strange quarks
in the nucleon carry about 2.7 percent of the momentum of the nucleon,
with an error which puts this result almost 5 standard deviations from
zero.
JLab's Safety Numbers
70 Days since Last Recordable Accident (JLab record:
331)
70 Days since Last Lost Workday Accident (JLab record: 676)
JLab Calendar of Events
Nov. 21-22: Lattice
QCD and Experiment: Revealing the Structure of Hadrons
Nov. 27-28: Thanksgiving holiday - JLab closed
Dec. 3: Colloquium
and Public Lecture
Dec. 8-12: Muon
Collider Design Workshop
Dec. 24-Jan. 2: Winter
holidays/Shutdown days: JLab closed |
Environment, Safety, Health & Quality
Update (11/21/08): This ES&H Manual Chapter 6122 update is not complete. The chapter is currently being updated, and and an update will be available soon.
As part of Continuous
Improvement efforts, ES&H Manual Chapter 6122
Appendix T6 Welding and Brazing Program has been revised to
incorporate updates that respond to the initial implementation of the
program. The revision was made with the feedback of line users,
addressing items such as repairs, required analysis, category
clarification and additional examination requirements of Class B
joints. The revisions have been approved and are posted to the website
for site use. All ES&H Manual Chapter and Appendix updates will be
announced in the Weekly Briefs as they occur and will be listed on the
Insight page under JLab Safety Snapshot. Review these sources
periodically for up-to-date information.
Computing and
Networking Infrastructure
JLab Under Cyber Attack
The Department of Energy has authorized cyber security experts, called
Red Teams, to test computer security at the national labs. These teams
have been active recently and may target Jefferson Lab in the coming
weeks.
Red Team activities can include attempts to hack into lab computer
systems from both offsite and onsite. Recent Red Team attempts to get a
toehold in a lab's network have been made through phishing and social
engineering. Some successful examples include the sending of
official-looking CDs in the mail or leaving a memory stick in a public
place that installs Trojans when inserted into a computer, sending
official-looking e-mails with embedded web links to malicious websites,
and placing phone calls to users claiming they represent the Helpdesk.
Here are a few quick tips on practicing good cyber security:
- Do not open any e-mail attachments that are
suspicious (unknown sender,
unexpected e-mail with an attachment or asking for information, etc.);
- Do not click unknown links in e-mails (fake greeting
card links, html
addresses you can't see or identify in plain text, links in unsolicited
e-mail from a bank, etc.);
- Do not use a CD or memory stick from an unknown
source;
- Never give out your password or other identifying
information to someone else, even if they are claiming to be JLab staff;
- Always lock your screen or log out of your computer
before you leave your office.
These links provide useful information about thwarting cyber security
attacks:
http://www.jlab.org/news/news_letter/2007/20071129/index.html#Tis
http://www.jlab.org/news/news_letter/2006/20060818/index.html#security
http://www.jlab.org/news/OnTarget/2008/2008-06/Story2.html
Announcements
Holiday Desserts to Tempt
Your Taste Buds
The Quark Cafe is now taking Thanksgiving dessert orders. The deadline
for pie orders is 2 p.m. on Friday, Nov. 21. Order forms and a full
list of desserts are available in the cafeteria.
Mobile Mammography Unit
Onsite Dec. 8
The Sentara Mobile Mammography Unit will be in the ARC parking
lot at Jefferson Lab on Dec. 8, from 9 a.m.-2 p.m. Mammography detects
breast cancer, and The American Cancer Society recommends scheduling
your first or baseline mammogram by age 40. The procedure only takes 15
minutes. This service is open to all employees, as well as their family
members or friends; personal health insurances will be billed. To
make an appointment, call 1-800-SENTARA (736-8272).
Quark Cafe Invites Your
Input Through Online Survey
Quark Cafe staff members highly value your input and want to ensure
that food service quality and service levels meet or exceed your
expectations. Completing this survey will take less than five minutes.
The information you provide will help the Quark Cafe strengthen its
levels of food service and prioritize improvement efforts to ensure the
highest levels of customer satisfaction. This survey is strictly
confidential. Take a moment to complete
the survey by clicking on the link. The link will remain open
through Dec. 3. |
Privacy and
Security Notice
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