Friday, April 18, 2014

Have a safe day!

Friday, April 18

3:30 p.m.

4 p.m.
Joint Experimental-Theoretical Physics Seminar - One West
Speaker: Tracy Slatyer, MIT
Title: Characterizing a Potential Dark Matter Signal in γ-Rays from the Central Milky Way

Monday, April 21

2 p.m.
Particle Astrophysics Seminar - Curia II
Speaker: Marc Kamionkowski, Johns Hopkins University
Title: Big B, Little B, What Begins with B? Bandits, B Modes, and Bispectrumese

3:30 p.m.

4 p.m.
All Experimenters' Meeting - Curia II
Special Topic: T-1036: High-Rate Pixel Detector for CMS

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

Ongoing and upcoming conferences at Fermilab


Take Five


Extended forecast
Weather at Fermilab

Current Security Status

Secon Level 3

Current Flag Status

Flags at full staff

Wilson Hall Cafe

Friday, April 18

- Breakfast: strawberry and banana crepes
- Breakfast: chorizo and egg burrito
- Seafood po' boy
- Smart cuisine: chana masala
- Tuna noodle casserole
- Honey mustard, ham and Swiss panino
- Chicken fajitas plate
- Tomato basil bisque
- Texas-style chili
- Assorted pizza by the slice

Wilson Hall Cafe menu
Chez Leon

Friday, April 18

Wednesday, April 23
- Grilled teriyaki shrimp kebobs
- Couscous
- Sugar snap peas
- Coconut flan

Chez Leon menu
Call x3524 to make your reservation.


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One minute with Leonard Harbacek, instrument welder

Leonard Harbacek inspects a gas distribution manifold he built with engineer Cary Kendziora and senior technician Bill Miner. Harbacek has worked as a Fermilab welder for 16 years. Photo: Reidar Hahn

What might you do in typical workday?
As a welder, in the morning I might be cutting steel 19 inches thick, and in the afternoon I might be working on a clean cryogenic system.

I travel around the Fermilab site with a portable automatic welder, going to different locations to make high-quality welds. I like to make myself available to help with a wide range of tasks. I also work in a building with a research and development team.

What's the best part of your job?
The best part of my job is the challenge of it. You get to work with new ideas and create something.

For example, 12 years ago I was asked to help build focusing horns for NuMI and MiniBooNE. For this, I needed to make X-ray quality welds. These welds can have only very small pits and no cracks, and they're vacuum-tight. It took us a year to develop the welding parameters. And now we're now in the process of producing a new generation of horns.

When did you begin welding?
Right out of high school I worked at a small welding company. The man I worked for was a welder at Argonne, and then he started his own business. He's the one who taught me how to weld.

What do you enjoy doing outside of work?
Spending time with my wife and three grandchildren comes first. And in the summer, it's anything I can do outside — mow the lawn, plant flowers, detail the car. In the winter, I like to work with stained glass. The best piece I've made is Southwestern-themed and hangs in my den. It has over 300 pieces of glass and took two years to make.

What's something people may not know about you?
I was a Seabee from '72 to '75. That's what they call construction workers in the Navy. During that time, I helped build an airstrip at Diego Garcia, a small coral island in the Indian Ocean.

Amanda Solliday

In Brief

Wilson Hall power outage - Saturday from 6 a.m. to 6 p.m.

Workers will perform electrical maintenance at the laboratory on Saturday, April 19, from 6 a.m. to 6 p.m. Power will be shut off in Wilson Hall, and the building will be locked. Only authorized personnel will be allowed to enter the building during this time.

The Wilson Hall email network will be unavailable, and the emergency communication center in Wilson Hall will have auxiliary power, cooling and limited networking during the outage.

All Wilson Hall occupants should turn off their electronic devices before they leave today.

Photo of the Day

Feynman family vacation

With the recent installation of an Airstream trailer on the front lawn of Wilson Hall, it looks as though a family of Feynman fans is camping out overnight at Fermilab. Photo: James Simone, SCD
In the News

Panel homes in on sites for γ-ray detector

From Nature, April 15, 2014

When very-high-energy γ-rays slam into Earth's atmosphere, they trigger particle showers that emit a faint blue light. With this light, astronomers want to trace the rare γ-rays — only a few strike each square metre of the atmosphere each month — back to their sources, violent objects such as supermassive black holes. But first researchers must find a home for the planned €200-million (US$277-million) Cherenkov Tele­scope Array (CTA) — or rather, two homes. The telescope will be made up of a 19-dish array in the Northern Hemisphere and a 99-dish array in the south.

At a meeting in Munich, Germany, on 10 April, representatives from the 12 CTA partner countries inched closer to picking the sites. In the Southern Hemisphere, they narrowed the list down to two possibilities: Aar, in southern Namibia; and Cerro Armazones in Chile's Atacama Desert. In the north, four sites remain in the running: two in the United States and one each in Mexico and Spain.

Read more

Physics in a Nutshell

Proving relativity: episode 3

One of the most nonintuitive consequences of Einstein's theory of special relativity is the idea that different people will experience time at different rates. This has no analog in classical theory, and yet it is easy to observe at laboratories such as Fermilab and CERN.

Read the full column on relativity and particle decay

"Time waits for no man" goes the saying, and it appears to be true. Inexorably the moments of our lives tick away until we have none left and slip away into the darkness. However, as painful as that truth is, we have some comfort in the fact that time marches on equally for all of us — pauper and prince. Time plays no favorites.

Einstein turned this comforting truism on its head in 1905 when he published his theory of special relativity. In one of the most nonintuitive consequences of his theory, time does not march at the same pace for us all — it depends on a person's velocity. Slow-moving objects age more quickly than their speedy brethren.

That just didn't seem even possible.

Luckily, at particle accelerator laboratories, it is pretty easy to increase the velocity of subatomic particles and put Einstein's idea to a strict test. Let me immediately get to the punch line: As bizarre as it seems, Einstein is right.

There are a ton of examples I can give from every particle accelerator laboratory on the planet, and they all confirm the theory of special relativity beyond a shadow of a doubt. Let's use one to illustrate the point: the Fermilab MINOS beamline, which shoots neutrinos in the direction of Minnesota.

Fermilab makes neutrinos by slamming high-energy protons into a target, creating a spray of particles. The most common are pions, which then decay into muons and neutrinos. Since the pions come flying out of the collision, they move while they are decaying.

To see the effect of relativity, we need to see just how long of a tunnel is needed to let them decay. To do that, we need to know the pions' velocity and how long they live. In the same way that you can combine the speed of a car and the time it travels to determine the distance of its trip, you can figure out how far a pion will travel before it can decay.

We know very well how long stationary pions live. Because pion decay is essentially a form of radioactive decay, individual pions don't have a fixed lifetime any more than people do — some live longer and some shorter. But we can certainly say 95 percent of pions decay in 80 billionths of a second.

Read more

Don Lincoln

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In Brief

Retirement planning Lunch and Learn - April 23 and May 7

Retirement is one of the most challenging and exciting career milestones ahead for many of us. While you may not be contemplating retirement anytime soon, it's important to prepare for it. For most people, a successful and comfortable retirement requires lots of advance planning.

To help you start, the WDRS Benefits Office will offer a Lunch and Learn seminar on retirement planning on April 23 and May 7 at noon in One West.

Employees who attend will have the opportunity to learn all about their Fermilab retirement benefits. The sessions are open to all employees, whether they are already planning retirement or are simply interested in gathering information.

The same seminar will be presented on both dates. Feel free to bring a bag lunch. For more information, contact Jennifer Gondorchin at x4361.


Today's New Announcements

Zumba Fitness registration due April 24

SharePoint for contributors (end users) - today

SharePoint designer training - today

SharePoint site owner introductory training - today

Cross-step waltz workshop with dance historian - April 19

Zumba Toning registration due April 22

Pre-retirement planning Lunch and Learn - April 23 and May 7

Earth Week Fair - April 24

Three-on-three basketball tourney - starts May 1

Fermilab Time and Labor URLs changing

On sale now: Fermilab Natural Areas hats and shirts

A Smart Cuisine purchase earns you 10 bonus points

2014 Fermilab Golf League season is upon us

Wednesday Walkers

Scottish country dancing meets Tuesday evenings at Kuhn Barn

International folk dancing meets Thursday evenings at Kuhn Barn

Indoor soccer

Find new classified ads on Fermilab Today.