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
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Jefferson Lab Weekly Briefs
July 29, 2009
12 GeV Upgrade
The first superconducting magnet contract (for the Hall C/SHMS Q1
magnet) was awarded July 10, thus completing an important milestone in
the project plan. Hall D recently held reviews of two of their
subsystems. A review committee validated the tagger magnet final design
and advised the team to finalize the detailing in-house rather than
incorporating it into the construction contract award. A second review
committee evaluated two readout choices of the Barrel Calorimeter
detector. Committee members felt the first readout option, with silicon
photomultipliers, looked very promising and recommended a test plan be
developed for final certification and quality assurance of prototypes
during the remainder of this calendar year. The more conventional
backup option with fine-mesh photomultiplier readout was again found to
be viable with a sufficiently detailed implementation plan, if needed.
Accelerator
The Scheduled Accelerator Down period continued with maintenance on RF
(radiofrequency) systems, magnets, the vacuum system, the control
system, the personnel safety system and more. On July 22, a hurricane
power test was conducted and some problems were identified. The
accelerator sprinkler system was tested. On July 25, beam was steered
up to the 500 KeV dump in the injector.
Free-Electron Laser
FEL staff performed some key measurements this week on optical
coatings. Last Friday, the team held a User Workshop in support of
plans for a Soft X-ray capability of the FEL called JLAMP. The plans
were well received and the group is developing a science case for
presenting it to DOE.
Theory Center
A new paper <arXiv:0907.2395>
derives mass corrections for semi-inclusive deep-inelastic scattering
of electrons from nucleons, using a framework which incorporates the
initial state mass of the target nucleon and the final state mass of
the produced hadron. The hadron mass corrections are made by
introducing a generalized, finite-Q2 scaling variable for the hadron
fragmentation function and are found to be even larger than for
inclusive structure functions. The mass corrections compete with the
experimental uncertainties at kinematics typical of JLab experiments
and will be important to efforts at extracting parton distributions or
fragmentation functions from semi-inclusive processes at intermediate
energies.
JLab's Safety Numbers
14 Days since Last Recordable Accident (JLab record:
331)
322 Days since Last Lost Workday Accident (JLab record: 676)
JLab Calendar of Events
July 29: American
Red Cross Blood Drive
July 31: Science
Education Summer Poster Session
Aug. 5: Safety
Glasses Vendor onsite
Aug. 19: Jefferson Activities Group Luau
Aug. 19-21: GPUs for Lattice QCD Workshop
Aug. 27: Safety
Shoe Vendor onsite
Sept. 7: Labor Day holiday
Sept. 17: JSA's
Electronic Commerce Vendor Show
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Environment, Safety, Health & Quality
Many JLab personnel
have personal electric appliances in their cubes, trailers or
offices. Here are some general tips to keep these types of items
safe both at work and at home:
- Do not use an electric appliance near water; you
could be electrocuted.
If an electric appliance falls into a sink or tub of water, or if you
touch an appliance with wet hands or while standing in water, you risk
severe electric shock and possibly death.
- Never use any electric appliances (radios,
televisions, hair dryers, etc.) near sinks, toilets or bathtubs.
- Always dry your hands before touching electric
appliances, computers, power tools and televisions.
- Keep the floor around your washer and dryer clean and
dry.
- Check appliance cords for frays, broken plugs,
damaged wires, knots or melted insulation. They can cause electrical
shocks or fires. Have them repaired or replace them promptly.
- Unplug small appliances when washing them.
- When using an electric appliance with removable
cords, always connect
the cord to the appliance first, then plug it into the wall outlet. To
disconnect the appliance, unplug it from the wall outlet first, and
then disconnect the appliance cord.
- Do not pull on an appliance cord to disconnect it
from the socket. You could damage it.
- Disconnect all appliances by grasping the plug
directly from the socket. Be careful not to let fingers touch the metal
prongs.
- Do not overload electric outlets with too many
appliances or lamps.
- Unplug your iron and other appliances when not in use.
- Make sure appliance cords do not come in contact with
hot surfaces.
- Use extension cords with three-pronged plugs for
appliances that require grounding.
- Do not place electric cords under rugs or mats where
they can be walked on or damage can go unnoticed.
- Unplug all electric appliances before you work on
them. Even when
replacing a light bulb, it’s best to unplug the lamp or turn the power
off to the light fixture.
- Do not touch an electric appliance with a metal
object; you could be
electrocuted. For example, do not use a kitchen knife to retrieve items
from toasters, dishwashers, dryers or any other electric appliance.
- If you receive any kind of shock from a large
appliance or any other
electrical device, other than from static electricity, have an
electrician check it.
- If an appliance emits smoke or sparks, or if you feel
a tingle or light
shock when it’s on, stop using it. Discard or replace the appliance or
electrical device, or have it repaired.
- Put safety covers over unused electric outlets. This
is very important
if you have children in your home. Never let children play around
outlets.
Announcements
Today:
American Red Cross Blood
Drive
The American Red Cross Blood Drive is taking place today from 10
a.m. - 4 p.m. in CEBAF Center Room F113. Walk-ins are welcome! Nearly
30 individuals made reservations, but blood drive planners are hoping
walk-ins will stop by to meet the goal of 50 donations today. Blood
supplies tend to run low in the summer due to seasonal travel that
prevents donors from giving. For more information, contact Johnie Banks, Occupational Medicine,
x7539.
New JLab Video: Special
Viewing Today
Public Affairs will hold a viewing today at 11 a.m. in the CEBAF Center
auditorium of the lab's new video: Exploring the Nature of Matter. The
viewing is open to everyone at the lab. The video provides an
introduction to the lab and a nontechnical explanation of the
Continuous Electron Beam Accelerator Facility and the kind of research
this unique facility is used for. The video mentions several of JLab's
areas of special expertise as well as its technology transfer and
science education endeavors.
Free DVD copies of the video will be available for pick up afterward in
the CEBAF Center lobby. One per person, please. The video may also be
viewed online.
Visit JLab Summer Poster
Session
The JLab community is invited to visit the 2009 Summer Science
Education Poster Session taking place Friday, July 31, from 11:45 a.m.
to 2 p.m. in the CEBAF Center lobby. The more than 40 participants of
this year's High School Summer Honors Internship Program, the Science
Undergraduate Laboratory Internship (SULI) program, the ODU Research
Experience for Undergraduates program and the Academies Creating
Teacher Scientists (ACTS) program will be on hand with posters they
developed based on their work or research projects. Drop by for a few
minutes and share in their discoveries and passion for science and
science education.
Call for Papers for the
International Symposium on Hydrogen in Matter
The Third International Symposium on Hydrogen in Matter will take place
Dec. 13-16 at the Indian Institute of Technology Madras, Chennai,
India. Symposium sponsors have announced an Aug. 31 deadline for
submitting abstracts. Abstract selections will be made on Sept. 15.
Selected full-length papers will need to be submitted by Oct. 30.
For more information, see the ISOHIM-2009
website or posters around the JLab campus.
Back-to-School Sales Tax
Holiday Begins August 7
Virginia's tax holiday will take place August 7 - 9. During the
three-day period, many school supplies costing $20 or less each and
clothing items and footwear costing $100 or less each will be exempt
from the state's five percent sales tax. For the entire list of exempt
items, visit www.tax.virginia.gov.
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