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
April 22, 2009
12 GeV Upgrade
Responses to the request for Best-and-Final Offers (BAFOs) for the
fabrication of the superconducting radiofrequency cavities have been
received and evaluation has begun. Evaluation of the BAFOs for the
4-meter
dipole magnet fabrication have been completed. The award package for
the klystrons has been reviewed and approved by DOE. Final review of
the design and number of new quadrupole magnets for the accelerator
beam transport system has been completed. The Request for Proposals
(RFP) has been issued for the cryomodule space frames. Finally, the
award package for the purchase of cryomodule waveguides is under review
by DOE.
Physics
In Hall A, the BigBite spectrometer was successfully moved to backwards
of the right High Resolution Spectrometer in preparation for the three
upcoming polarized helium-3 experiments, E05-015, A Measurement of the
Quasi-elastic Single Spin Asymmetry, E08-005, Measuring the Transverse
Asymmetry in the 3He(e,e'n) Reaction and E05-102, Measuring the
Transverse Asymmetries in the 3He(e,e'd) Reaction. The laser for the
Compton polarimeter was exchanged for a version with double the power,
and the power supplies of the Q1 and Q3 magnets of the right HRS were
repaired. The replacement of one of the vertical drift chambers in the
right HRS has been completed.
Hall B is on track with preparations for the upcoming eg1-dvcs (II) run
period.
Installation work continues in Hall C for the hypernuclear experiment,
E05-115. The raised concrete floor has been completely poured. The High
Resolution Kaon Spectrometer and High Resolution Electron Spectrometer
(HES) have been moved to approximate positions, and a wall of the HES
bunker
has been assembled.
Accelerator
The scheduled accelerator down was transitioned to the beam restoration
period on Friday, April 17. Over the weekend, Operations personnel
restored 5.90 GeV, 5-pass beam and then scaled the accelerator to 5.968
GeV. Continuous wave beam (15uA) was successfully delivered to the beam
switchyard beam dump by Sunday. All the magnets, radiofrequency and
other sub-systems have been performing well.
Free-Electron Laser (FEL)
The FEL group made progress in providing active stabilization of the
resonator mirrors while the low-conductivity water piping is being
worked. Staffers are also trying to identify possible sources of arcing
in the high-voltage power supply. The group is on track to resume
operations on May 18.
Theory Center
With the hadronic parameters constrained by the world data of π N
reactions, a recent paper <arXiv:0904.1918
[nucl-th]> from the Excited Baryon Analysis Center demonstrates
how the pion electroproduction data from the CEBAF Large Acceptance
Spectrometer can be used to extract the electromagnetic structure of
nucleon resonances. This advance paves the way for extracting nucleon
resonance parameters by performing a dynamical coupled-channel analysis
of one-pion and two-pion production data from CLAS.
JLab's Safety Numbers
107 Days since Last Recordable Accident (JLab record:
331)
224 Days since Last Lost Workday Accident (JLab record: 676)
JLab Calendar of Events
April 22: Earth Day
May 1: Adopt-A-Spot
Litter Pickup
May 2-5: APS April
Meeting in Denver
May 20: JLab Annual Run-A-Round
May 25: Memorial
Day holiday, lab closed
June 1-19: HUGS
2009
June 2-4: 53nd Annual
Materials Management Workshop
June 8-10: Users Group Workshop and Annual Meeting
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Environment, Safety, Health & Quality
JLab’s
Environmental Management System (EMS) will undergo an audit April
27-30, conducted by a joint team from Oak Ridge and the Thomas
Jefferson Site Office. Personnel from multiple areas of the lab will be
interviewed during this assessment.
Certain elements of JLab activities, products or services interact
with the environment, including light bulbs, coolants and other fluids
generated during the course of our normal activities. Significant
environmental aspects of these activities are those that have been
identified as having the
possibility of a large impact. Examples of significant aspects
are wastewater discharge and normal energy use. JLab's EMS helps us to
minimize environmental impacts from lab activities, processes and
services. Under the EMS, everyone has a role. Some ways you can help
with JLab's EMS effort are:
- Know how your activities affect the environment;
- Be aware of and manage the significant aspects
associated with your activities;
- Make sure new or changed activities or materials
receive an
evaluation to see if they pose a risk to the environment;
- Report environmental releases to your
supervisor/sponsor and to x4444; and
- Share ideas for improvement with your
supervisor/sponsor;
ESH&Q will continue to provide EMS briefings to specific
organizations and individuals involved with significant aspects. If you
have any questions, call Linda Even at x7308, Gina Dixon at x7417, or
your organization’s EMS Committee member. For more information, see the
related posting in Spotlight
news on Insight.
Computing and
Networking Infrastructure
Computer
User Audit
The semi-annual computer user audit will start on
May 4. All supervisors and sponsors of JLab accounts will need to
affirm the need for those people you supervise or sponsor to continue
to have computer user accounts at JLab. More information will be sent
as the time approaches.
Announcements
Change
the World, Start With Energy Star
Today is Earth Day 2009! On this important day, the
U.S. Environmental Protection Agency wants to thank you for
taking the Energy Star Pledge and helping to fight global warming by
saving energy. Your efforts, combined with those of more than two
million
others, have the potential to save nearly $350 million in energy
costs and prevent close to five billion pounds of greenhouse gas
emissions. For
more information and useful ideas and suggestions, visit the Energy Star website.
Department of
Energy Promotes Special Earth Week Feature on Energy.gov
Simple Steps
Will Help Consumers Save Money -- and
the Planet. During Earth Week, visitors to the U.S. Department of Energy website
will be immediately directed to a special web feature that
provides key energy-saving tips and user-friendly
information
about critical emerging technologies and initiatives underway to
move the nation toward a clean-energy economy.
Volunteers Needed for
Earth Day/Adopt-A-Spot Litter Pick up on May 1
Volunteers are needed to help with an Earth Day/Adopt-A-Spot litter
pick up from 11:30 a.m. to 12:30 p.m. on Friday, May 1. Everyone at
JLab is
invited to take part in this community service project. Sign up
on the webpage in advance, so adequate supplies can be provided.
Meet in the CEBAF Center lobby at
11:15 a.m. for a short safety briefing and to pick up gear.
Litter pickup will cover the sidewalk and grass areas paralleling
Jefferson Avenue up to Oyster Point Road and areas
across the JLab campus. Wear clothes comfortable to move in, long
sleeves, long pants, sturdy shoes and gloves. If you have questions,
contact Deb Magaldi.
National Instruments Mobile Expo to Visit JLab
National Instruments, the makers of LabView, will conduct
demonstrations of the latest technologies for automated testing in
their Mobile Expo on April
28. The 40-foot vehicle will showcase a variety of example systems
tackling mechanical, DC, RF, and mixed-signal tests. Find out how you
can use the power of software-defined modular instrumentation to create
fast and flexible test systems that minimize the cost of testing. The Mobile Expo will be located behind
the Test Lab from 1- 4p.m.
2009 Jefferson Activities
Group Run-A-Round Set for May 20
Dust off those running shoes! The 24th annual Jefferson Activities
Group Run-A-Round will be held Wednesday, May 20, from 3-6 p.m.
Jefferson Lab staff, users, full-time contractors and immediate family
members are invited to participate. Staff and users that participate
can receive a free 2009 JLab T-shirt by turning in their Run-A-Round
race bibs at the T-shirt distribution tent. You can find more
information and register for the Run-A-Round online. Volunteer sign
up will also be available soon via the JAG webpage.
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