Thursday, Feb. 17, 2011

Have a safe day!

Thursday, Feb. 17
3:30 p.m.

Friday, Feb. 18
3:30 p.m.
4 p.m.
Joint Experimental-Theoretical Physics Seminar - One West
Speaker: Brian Rebel, Fermilab
Title: Search for Lorentz Violation in the NuMI Beam with the MINOS Detectors

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a weekly calendar with links to additional information.

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Secon Level 3

Wilson Hall Cafe

Thursday, Feb. 17

- Breakfast: Apple sticks
- Santa Fe black bean soup
- Steak tacos
- Chicken Wellington
- Chimichangas
- Baked ham and swiss on a ciabatta roll
- Assorted sliced pizza
- *Crispy fried chicken salad

*carb-restricted alternative

Wilson Hall Cafe Menu

Chez Leon
Friday, Feb. 18
- Closed

Wednesday, Feb. 23
- Broiled tilapia with Thai coconut curry sauce
- Jasmine rice
- Tropical coconut cake

Chez Leon Menu
Call x3524 to make your reservation.


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Special Announcement

Learn more about Fermilab's future on new site

Fermilab pursues a diverse, world-leading research program that addresses the most important—and most challenging—questions related to research at the Energy, Intensity and Cosmic frontiers.

With the closing of the Tevatron particle collider, Fermilab will shift its primary research focus from the Energy Frontier to the Intensity Frontier, construct new experiments and pave the path for large-scale projects that require the world's most intense particle beams.

A new website launched today provides information about Fermilab’s current research program, the projects and experiments that will ramp up over the next few years, and our plan for Fermilab’s long-term future. The site is also the place to ask questions and read answers about Fermilab's future plans and projects. Be sure to check back over the next few months, as more information about federal funding for basic science, and its impact on Fermilab’s plan for the future, becomes available.

Visit the site

Fermilab Press Release

Fermilab offers Family Open House on Sunday, Feb. 27

Children participate in a hands-on activity at the 2010 Fermilab Family Open House. This year’s Open House will take place on Feb. 27. Photo: Reidar Hahn

This year's Family Open House at the Department of Energy's Fermi National Accelerator Laboratory will take place from 1 to 5 p.m. on Sunday, Feb. 27. The Open House offers family-style hands-on activities, science shows and Q&A sessions with scientists. The event is free of charge. Advance registration is necessary for tours and is available here. Registration is not necessary to attend the Open House. More than 2,000 people are expected to attend.

The highlights of this year's program will include hourly cryogenics shows by Jerry Zimmerman as "Mr. Freeze," the popular Ask-a-Scientist session on the 15th floor of Wilson Hall, and hands-on exhibits designed and built by area high school physics students.

"The Open House offers activities for the entire family," said Spencer Pasero, an education program leader at Fermilab. "Mr. Freeze and his cryogenics show are always a hit, and I'm very excited about the activities the high school students are contributing. This is a party for children who bring an adult with them to learn about the world of physics."

About a dozen scientists will be on hand to answer questions in the exhibit area on the 15th floor of Wilson Hall where visitors can get a bird's eye view of the Fermilab site and the surrounding towns.

The Family Open House is free of charge and made possible by an anonymous donor to Fermilab Friends for Science Education.

Fermilab is a Department of Energy national laboratory operated under contract by the Fermi Research Alliance, LLC. The DOE Office of Science is the single largest supporter of basic research in the physical sciences in the nation and helps ensure U.S. world leadership across a broad range of scientific disciplines.

View the press release

Fermilab physicist Dave Schmitz helps children look for hidden "particles" during the 2010 Fermilab Family Open House. This year’s Open House will take place on Feb. 27 and will feature hands on exhibits and Ask-A-Scientist sessions. Photo: Reidar Hahn

In the News

Getting in touch with nature

From Kane County Chronicle,
Feb. 15, 2011

Editor's note:This article mentions the environmental efforts of Bob Lootens, Jon Cooper and Martin Valenzuela, who are all Fermilab employees.

Preparing to trudge through deep snow, Jon Cooper, Mark Allen and Bob Lootens gathered Saturday morning in the parking lot of the Fabyan Forest Preserve in Geneva.

They filled buckets with saws and herbicide and resumed work on a job that’s done at forest preserve areas throughout Kane County all year long – a habitat restoration day.

Volunteers meet on a regular basis to clear areas of unwanted plants and to spread seeds to promote growth of what is desired. The goal is to allow native prairie to thrive. The work is performed by stewards, who coordinate the outings and by anyone else who wants to show up.

On Saturday at Fabyan, the mission was to cut down buckthorn, and Cooper, Allen and Lootens ultimately were joined by Nancy and Denis Bowron to tackle the job.

Read more

Result of the Week

Measuring the heaviest mass from the lightest fragments

In the insert figure, the measured top quark mass is shown at the bottom of the curve. In the larger image, the blue points show the data from the most recent measurement and the red lines show how well the data fit with a prediction of the signal and background combined. The black line shows the predicted background only.

The top quark is the heaviest currently known elementary particle, with a mass nearly equal to that of a gold atom. Because of its very large mass, it may play a special role in our understanding of the fundamental theory that describes the electromagnetic interaction and the weak interaction in a unified way. This theory could also explain the origin of particle masses.

Because of the importance of the top quark mass, experimenters at the Tevatron have focused much of their efforts to improve the level of precision of its measurement. CDF scientists recently used a new strategy to make a precise measurement of the top quark mass.

Top quarks exist only for tiny fractions of a second before they decay, so scientists cannot directly detect them. However, scientists can infer the top quark from tracing backward from the particle's decay products: light particles called leptons (electrons and muons) and jets, which are sprays of heavier particles called hadrons (such as pions, protons and neutrons).

CDF has recently measured the mass of the top quark using only the information taken from the leptons in top quark decays. This measurement is possible because the characteristic shape of the momentum (or energy) distribution of the leptons in top quark decays is sensitive to the mass of the top quark. A heavier top quark has a stiffer, or higher momentum spectrum, than a top quark with a lighter mass.

Costas Vellidis was responsible for this analysis.

To make a precise measurement, CDF scientists plotted the momentum distribution of leptons in potential top quark events and then compare that shape to simulations of top quark masses.

Although this method uses only one part of the available information in the top quark decay and has a limited statistical precision, it has very different measurement uncertainties that make it an important cross check to the more traditional approaches.

This measurement agrees well with a measurement reported in the Nov. 18 issue of Fermilab Today.

-- Andrew Beretvas

Accelerator Update

Feb. 14-16

- Three stores provided ~33.3 hours of luminosity
- Interlock personnel replace a bad MI card
- Controls personnel replace a bad Pbar card
- Tevatron cryo system quenches after store 8498 was terminated
- Booster personnel replaced power supply for low-level RF system
- Booster personnel repairs termination for Chopper
- Network Storm hits; Controls personnel located and isolated problem, but the storm affected many pieces of equipment
- Preaccelerator personnel switched from the H- Source to the I- Source
- Booster personnel worked on extraction issues
- DZero required an 8-hour access on Wednesday to repair detector

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


WDRS announcements

FRA scholarship applications due March 1

Latest Announcements

Annual Fermi Natural Areas membership meeting - Feb. 17

Best of Dance Chicago - dedicated to Dr. Morris Binkley - Feb. 19

InDiCo upgrade - Feb. 21

Toastmasters today

Project Management Introduction class - Feb. 18

Apply now for URA Visiting Scholars Awards program deadline - Feb. 18

NALWO - Piano Concert at noon - Feb. 21

Argentine Tango classes through Feb. 23

School's Day Out - Feb. 21 and 25

Introduction to LabVIEW course - Feb. 25

Embedded Design with LabVIEW FPGA and CompactRIO class - Feb. 25

Rapid Hardware Prototyping and Industrial Control Application Development with LabVIEW FPGA, Compact RIO, and FlexRIO by National Instruments course - Feb. 25

NALWO - Mardi Gras potluck - March 3

March Deadline for The University of Chicago Tuition Remission program - March 4

On-site housing for summer 2011 - Now taking requests deadline - March 7

NALWO arts & crafts show & tell - March 15

Fermilab Employee Art Show applications due - March 16

The Service Desk is offering a new loaner laptop service

View UEC tax presentation for users online

FRA Scholarship 2011

Open basketball at the gym

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