Fermilab Today Friday, Oct. 30, 2009

Have a safe day!

Friday, Oct. 30
3:30 p.m.

Monday, Nov. 2
1:30 p.m.
Research Techniques Seminar - Curia II
Speaker: Juha Kalliopuska, VTT Micro and Nanoelectronics, Finland
Title: Edgeless Detectors for High Energy Physics Applications
2:30 p.m.
Particle Astrophysics Seminar - One West
Speaker: Tyce DeYoung, Pennsylvania State University
Title: Particle Physics and Astrophysics with IceCube
3:30 p.m.
4 p.m.
All Experimenters' Meeting
Special Topics: ILC Cavity Gradients and Manufacturing; CMS/LHC Report - Curia II

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


Take Five
Tune IT Up

H1N1 Flu

For information about H1N1, visit Fermilab's flu information site.



Extended Forecast
Weather at Fermilab

Current Security Status

Secon Level 3

Wilson Hall Cafe

Friday, Oct. 30
- Chorizo burrito
- Italian vegetable soup
- Teriyaki chicken
- Southern fried chicken
- Mediterranean baked tilapia
- Eggplant parmesan panini
- Assorted slices of pizza
- Assorted sub sandwich

Wilson Hall Cafe menu

Chez Leon

Wednesday, Nov. 4
- Pork braciole
- Latin-fried rice
- Pineapple flan

Thursday, Nov. 5
- Red pepper soufflé with julienne of zucchini
- Lobster tail with drawn butter
- Spaghetti squash with scallions
- Steamed green beans with dill
- Cremé brule

Chez Leon menu
Call x3524 to make your reservation.


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Fermilab Special Result of the Week

CDMS looks for finger prints of axions

The finger print that CDMS is looking for: the expected solar axion event rate in a germanium detector depends on the energy of the axions and the position of the sun in the sky. The position of the sun is plotted as time of day.

The theory of strong interactions, known as quantum chromodynamics, predicts that matter and antimatter behave slightly differently, a phenomenon known as CP violation. However, CP violation has never been observed in strong interactions.

In order to save QCD from this dilemma, theorists predict the existence of a particle known as the axion, which barely interacts with matter. While the particle fixes the CP violation problem, experiments have not yet detected any axions.

According to theory, an axion could emerge when a photon traverses a very strong electric or magnetic field. The core of the sun would be a perfect region for the creation of axions. The particles would immediately escape the sun and some of them would travel through Earth.

The Cryogenic Dark Matter Search, which takes place deep underground in the Soudan Underground Laboratory in Minnesota, has searched for axions and set new limits on the properties of these particles. The result made the cover of the Oct. 1 issue of Physical Review Letters.

The primary goal of the CDMS collaboration is the search for weakly interacting massive particles, which are candidates for dark matter particles. But its germanium and silicon detectors, which operate at 40 milliKelvin, are also extremely sensitive to low-energy X-ray photons and hence serve as axion detectors as well. Solar axions that traverse the CDMS detectors would coherently scatter off crystals in the detectors, akin to X-ray Bragg scattering off crystal planes. The interaction probability depends on the energy and the incident angle of the axions.

Determining the incident angle required the precise knowledge of the orientation of the detector crystal planes, which are located a half mile underground, with respect to the location of the sun — a daunting task. Fortuitously, in 1999 the Fermilab Alignment Group had measured the absolute geodesic true North in the Soudan mine to within a few millidegrees of accuracy. The directions of the CDMS crystal planes are also precisely known.

Still, CDMS scientists had to correlate the two measurements, a challenge since the detectors are located inside a vacuum vessel and buried within a massive shield to protect the detectors from background noise. Ultimately, CDMS scientists determined the direction of their detectors relative to the sun to within three degrees of accuracy.

A detailed analysis of the CDMS data has not yet revealed evidence for solar axions: the search continues. The article in the Oct. 1 issue of Physical Review Letters provides detailed information.

— Jonghee Yoo

These members of the CDMS collaboration played a leading role in this analysis: top row, from left: Jonghee Yoo and Dan Bauer, Fermilab; Jim Beaty, University of Minnesota; Steven Yellin, Stanford University. Bottom photo, from left: Tobias Bruch, Laura Baudis and Sebastian Arrenberg, University of Zurich.
Special Announcement

Daylight saving time: Change your clock and battery

Set your clock back one hour Saturday night and replace fire alarm batteries. Image courtesy of Ben Dobson through the Creative Commons license.

The members of the Fermilab Fire Department would like to remind you that daylight saving time ends this Sunday at 2 a.m.

When you set your clocks back an hour, remember to check and/or change the batteries in your flashlights and smoke and carbon monoxide detectors.

You should also remove dust from detectors monthly for proper operation. Statistics show that properly working smoke detectors save lives. Contact the Fire Department at x3428 with any questions.

You can learn more about the history of daylight saving time here.

In Brief

TSA program requires additional passenger data

Effective immediately, the Fermilab Travel Office is requiring all Fermilab travelers, travel arrangers and users to complete a travel profile. The profile will include your name, birth date, home address, emergency contact details, business e-mail, business phone number and Fermilab employee identification number.

The Transportation Security Administration (TSA), an agency in the Department of Homeland Security, has put into place a Secure Flight program requiring airlines to collect additional passenger data for their flights. In an effort to comply with TSA and airline requirements and to minimize delays at security check points, the Fermilab Travel Office will transmit information collected from you to the airlines.

The Travel Office will store the information permanently in a database that the Computing Division has ensured is secure to hold personal information. You can log in to modify your profile online at any time.

Instructions for how to create your profile are located on Fermilab's travel site.

More information about Secure Flight is available here.

Recovery Act Feature

Roll out the wavelength shifter barrel

The first barrels of the chemical powders PPO and bis-MSB began arriving at Fermilab in September. During the next year, Fermilab will receive 8,700 kilograms of the powders.

The first batches of two powdered chemicals, dubbed wavelength shifters, for the future NOvA neutrino project arrived by the barrel at Fermilab recently.

The American Recovery and Reinvestment Act funded the $2.1 million contract for the wavelength shifters, a crucial element for the neutrino project.

Scientists will use the two chemical powders, called PPO and bis-MSB, to change the wavelength of particles of light, called photons, into the required range for the experiment.

During the next year, Fermilab will receive 8,700 kilograms of the wavelength shifters. So far Fermilab has received 3,060 kilograms of the PPO and 120 kilograms of the bis-MSB powders.

"It takes a long time to manufacture this large an amount of the powders," said John Cooper, Fermilab NOvA project manager. Fermilab will receive the wavelength shifters in multiple shipments as they become available, he said.

As each shipment arrives, scientists from Fermilab and Northern Illinois University will test the chemical powders for quality control. Using an ultraviolet and visible spectrophotometer, for example, scientists can study the powder's transmittance, which is the area of the light spectrum the material absorbs and transmits.

"These tests tell us about the purity of the powder," said Fermilab chemist Anna Pla-Dalmau. "We requested 99.5 percent purity for NOvA, and we want to make sure that what we get works." All of the shipments received thus far have met the specifications requested by NOvA, she said.

Fermilab awarded the contract to Curtiss Laboratories, a small company in Bucks County, Pa., after a rigorous bidding and technical evaluation process. The nine-person company has reliably supplied chemicals to Fermilab for more than 10 years.

Fermilab expects the next shipment of the wavelength shifters to arrive in November.

— Elizabeth Clements

Visit Fermilab's Recovery Act Web site.


High school students from Japan visit Fermilab

CDF's Koji Sato explains the function of the CDF silicon detector to 10 high school students visiting from Shizuoka-Kita High School in Japan. The students visited Fermilab from Oct. 19 to 21.

During the hour-long tour of the CDF facility, Sato answered questions from the students about how the detector works. "Typically I don't get as many questions, so I think they were interested," Sato said.

Latest Announcements

English country dancing with live music - Nov. 1

Fermilab cafeteria closed tomorrow

GSA Halloween Party today

Fermi Martial Arts classes - Nov. 2

Health screenings available

Health Risk Assessments - Learn more about your potential health risks

Coed indoor volleyball starts in November

Facilitating Meetings That Work - Nov. 4

Fred Garbo Inflatable Theatre at Fermilab Arts Series - Nov. 7

PowerPoint Tips and Tricks - Nov. 11

Access 2007: Intermediate - Nov. 18

Process Piping (ASME B31.3) class offered in October and November

HTML Intro: Intro to Web Publishing - Dec. 1

"The Night Before Christmas Carol" at Fermilab Arts Series - Dec. 5

Discount movie tickets available

Chicago Bulls discount tickets

Chicago Blackhawks discount tickets

Thai Village restaurant discount

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