Fermilab Today Monday, April 30, 2007

Mon., April 30
2:30 p.m.
Particle Astrophysics Seminar - 1 West
Speaker: M. Kuhlen, Institute for Advanced Study Title: The Via Lactea Simulation - DM (sub) Structure in the Milky Way
3:30 p.m.
4:00 p.m.
All Experimenters' Meeting - 1 West
Special Topic: MI High Intensity Operation

Tue., May 1
3:30 p.m.

Real Time Computing 2007 will be held at Fermilab on April 29 - May 4, 2007
Click here for more information.

Click here for NALCAL,
a weekly calendar with links to additional information.


WeatherPartly Cloudy 77°/57°

Extended Forecast
Weather at Fermilab

Current Security Status

Secon Level 3

Wilson Hall Cafe
Monday, April 30
- Minestrone
- Chicken & mushroon cheese steak
- Baked chicken enchiladas
- Pot roast
- Garden turkey
- Assorted sliced pizza
- Szechwan green bean w/ chicken

Wilson Hall Cafe Menu

Chez Leon

Wednesday, May 2
- Calzone w/ sausage
- Roasted red peppers and 3 cheeses
- Romaine w/ cherry tomatoes & red onion
- Mocha cake

Thursday, May 3
- Tortilla chicken soup
- Halibut Veracruz
- Chipotle mashed potatoes
- Vegetable of the season
- Profiteroles stuffed w/ fruit

Chez Leon Menu
Call x4598 to make your reservation.


Fermilab Today
Result of the Week
Safety Tip of the Week
ILC NewsLine


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Reconstructing the universe, piece by piece

The blue arc has been lensed, making it appear much closer than it actually is.

Each Tuesday morning, a small group of particle physicists and astrophysicists gathers on the 6th floor of Wilson Hall to discuss progress in piecing together the structure of the universe. The group, called "Fermi Clusters," uses a telescope at Apache Point Observatory, New Mexico, and images and catalogs from the Sloan Digital Sky Survey to get a better view. Recently, the group has discussed exploring how sound waves from the infant universe confirm gravity's role in its formation, and examining 11-billion-year-old stars through gravitational lensing.

"Lensing occurs when an object in space is so massive that its gravity bends distant light," said astrophysicist Huan Lin. Lensed light often appears much brighter than it would otherwise. Last November, group members announced the discovery of a dramatically lensed galaxy 11 billion light years away. Since it takes 11 billion years for that light to reach Earth, the discovery allowed researchers to observe stars in the early universe.

With his work in sound waves, Juan Estrada studies patterns in the arrangement of galaxy clusters and compares them with patterns in sound waves from the universe's first million years. These sound waves -- caused by interactions between photons and matter in the early universe -- inserted ripples into the cosmic microwave background radiation left over from the Big Bang. In 2005, Sloan found matching ripples in the distribution of matter over a large sample of galaxies. Finding the same ripples in both the early universe and in today's galaxy distribution confirmed predictions that gravity was responsible for forming the universe's current structures. The ripples also provided a way to measure the properties of dark matter and dark energy. Estrada has recently found evidence of these ripples, called "baryon acoustic oscillations," in a different sample of Sloan galaxy clusters.

The group also discusses recent work in weak lensing. "Weak lensing occurs when galaxies are just a little bit distorted, and the way you measure it is by looking at the shapes of lots of galaxies," said Lin. Postdoc Jeff Kubo is looking at weak lensing in the Coma Cluster, one of the richest known galaxy clusters covering a large enough sky area that the Sloan Survey is needed to image it all for a weak lensing study. Weak lensing can be used to "weigh" the Coma Cluster and determine what percentage is made of dark matter. "Since its gravity distorting the light, you can calculate the overall mass of the cluster by looking at the amount of distortion," said Lin. "The stuff that adds mass, but that you don't see, is dark matter."

--Siri Steiner

In the News

Scientific American,
April 27, 2007

Magnet Trouble Likely to Complicate Start of Large Hadron Collider

Repairs may preclude a test run before the particle smasher starts tackling the Higgs boson

Researchers building the world's next top particle accelerator, the Large Hadron Collider (LHC) that straddles the Franco-Swiss border, may not get a chance to work out the bugs before they fire up the machine in earnest.

The experiment is still on track to begin hunting for the long sought Higgs boson next March, says LHC project leader Lyn Evans of the European Organization for Nuclear Research (CERN). But a crucial upgrade of 16 superconducting magnets around the accelerator will likely prevent a full test run planned for this December, he says, meaning researchers will have to troubleshoot glitches on the fly. Under that scenario, "if we have any problems, we will have to stop and fix them," he says.

Read more

Safety Tip of the Week

Electrical safety reminder

The primary cause of electrical incidents at DOE's Office of Science facilities has been contact with components that were not identified as being energized. One example: drilling into wiring hidden beneath walls or floors.

In a recent conference call with DOE field managers, the Chief Operating Officer for the Office of Science, George Malosh, remarked that electrical work continues to be a primary hazard. Looking at the causes of these accidents will help us to prevent the mistakes involved.

In the past 16 months, Office of Science facilities have submitted 251 reports to DOE's Occurrence Reporting and Processing System (ORPS). Of these, 41 were associated with electrical hazards. About two-thirds involved 120 VAC circuits while the remainder fell in the 208-480 VAC range. In 23 of the incidents, participants were unaware that energized components were present. This included wiring buried beneath walls and floors as well as loose conductors assumed to be de-energized. The remaining 18 incidents were evenly split between damaged current-carrying equipment and Lock-Out Tag-Out (LOTO) violations.

While none of the incidents resulted in serious injuries, DOE concluded that most were caused by the way work is reviewed, planned, and performed -- not because of missing programs or procedures. The solution is to correctly implement the existing electrical safety controls, such as knowledge of wiring locations, verification that circuits are de-energized, LOTO, and the use of work permits and PPE.

See ES&H Manual Chapters 5040-5048 for detailed guidance on electrical safety for Fermilab operations.

Safety Tip of the Week Archive

Accelerator Update
April 25 - 27
- Three stores provided 35 hours and 13 minutes of luminosity
- Pbar's Lithium Lens power supply over heats
- Stuck LCW valve on KRF3 halts beam
- Store 5376 aborted

Read the Current Accelerator Update
Read the Early Bird Report
View the Tevatron Luminosity Charts


Pine Street entrance closing extended:
Use Wilson Street entrance

Due to repaving operations, both the inbound and outbound lanes of Fermilab's Pine Street entrance will continue to be closed through Tuesday, May 1. Each day the Pine Street entrance will be closed at 6 a.m. and will reopen by 6 p.m. The Wilson Street entrance will be open between 6 a.m. and 6 p.m. Motorists on outbound Pine street should be cautious of rough uneven surfaces, bumps, water on road and the lack of pavement markings. The schedule is dependent on the weather. Fermilab Today will provide updates.

Scottish Country Dancing Tuesday
Scottish Country Dancing will meet Tuesday, May 1, at Kuhn Barn on the Fermilab site. Instruction begins at 7:30 p.m. and newcomers are always welcome. Most dances are fully taught and walked through, and you do not need to come with a partner. For more information call 630-840-8194 or 630-584-0825 or email.

Good luck, Brandi!
Brandi Myers of Human Resource Services (WDRS) is leaving. Please join us in wishing her goodbye and good luck on Wednesday, May 2, 2007 from 3:15 to 4:30 p.m.

Professional Development classes
New classes are always being added to the professional development schedule. For the most up-to-date course offerings, visit the professional development web site.

Play Ultimate Frisbee
Ultimate Frisbee games take place on the village soccer field on Monday and Wednesdays starting at 5 pm. If interested in playing or learning to play, contact Doug Moehs at x4490 or by email to get on the email list.

Upcoming Activities

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