Thursday, June 30, 2011

Have a safe day!

Thursday, June 30
2:30 p.m.
Theoretical Physics Seminar - Curia II
Speaker: Kemal Ozeren, University of California, Los Angeles
Title: Driving Missing Data at the LHC
3:30 p.m.
4 p.m.
Accelerator Physics and Technology Seminar (NOTE LOCATION) - Curia II
Speaker: Marc Ross, Fermilab
Title: ILC Technical Design Phase Progress
4 p.m.
Joint Experimental-Theoretical Physics Seminar (NOTE DATE) - One West
Speaker: Bruce Hoeneisen, Universidad San Francisco de Quito
Title: Updated Measurement of the Like-Sign Dimuon Charge Asymmetry

Friday, July 1
3:30 p.m.
4 p.m.
Joint Experimental-Theoretical Physics Seminar - One West
Speaker: Dmitri Tsybychev, State University of New York at Stony Brook
Title: New Results from ATLAS

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Thursday, June 23

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Wednesday, July 6
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Electrical engineer Ray Yarema retires after more than 40 years

Ray Yarema poses with Fermilab Director Pier Oddone after receiving the 40 Year Service Award on October 28, 2010. Photo: Reidar Hahn

Ray Yarema came to Fermilab in 1970 when the lab was under construction and employees traveled muddy roads to sit in dusty offices working on typewriters. He started off designing power electronics for the accelerator complex, which are still in use today.

He couldn’t have imagined how technology would’ve advanced in just four decades— or that he would still be here.

Today, he leaves behind some big shoes to fill in the Particle Physics Division’s Electrical Engineering Department, where he has led the application-specific integrated circuit (ASIC) design group he founded in the late ‘80s.

Tom Zimmerman, a Fermilab electrical engineer who has worked for Yarema since 1984, said he has the unique ability to identify promising technologies.

"He's a visionary," Zimmerman said. "He founded the ASIC design group at Fermilab because he saw that integrated circuit technology was an important development that could be of great benefit to the lab."

In the ASIC group’s early days, Yarema led the development of 2D integrated circuits, small silicon chips loaded with thousands to millions of transistors that are used to detect and track particles in collision detectors, including both CDF and DZero. Although it was a new technology in high-energy physics back then, ASICs now play a vital role in virtually every large high-energy physics experiment.

Most recently, Yarema led a team of engineers in the design of the first 3D integrated circuit for high-energy physics. Providing a higher density of electronics per area, 3D circuits could help revolutionize the field of electronics for high-energy physics by making future particle detectors lighter, more concise and more energy-efficient.

“He spearheaded what is now a worldwide collaboration in this field,” said Zimmerman, referring to an international consortium of sixteen institutions that Yarema organized to advance the development of 3D integrated circuits for physics experiments.

“I have to say, Ray is the ideal boss,” Zimmerman said. “I consider him my mentor—any time I run into a problem, I can always count on his sound advice. I’ll miss that.”

Yarema’s leadership roles also included serving as head of the Electrical Engineering Department for seven years until August 2008.

Read more

— Christine Herman

Ray Yarema works on a piece of equipment known as a dipole regulator in 1980, which runs in the main accelerator to this day. Photo: Fermilab.
In the News

Searching for gold...

From Quantum Diaries, June 29, 2011

G’day all! Today I will be continuing the Australian theme and discuss panning for gold. Which being completely correct isn’t really Australian, since it was probably practiced in any gold rich area. However in my defense, an integral part of Australian history is the gold rush in the late 19th century and a visit to one of the old gold areas is an excursion most Australian school children take.

For those who are wondering what gold panning is, it’s a method of searching for gold in stream beds using a pan. It doesn’t tend to yield high quantities of the precious metal, but it doesn’t take much equipment and can be used to locate gold rich areas. It requires lots of patience to sit by a stream and slowly separate the dense precious metal from the less dense, less interesting rocks and sand.

What does this have to do with particle physics and LHCb I hear you all ask? Well, gold panning is a fairly good analogy to trying to identify collisions in which B mesons are produced, and from those collisions trying to find the particular B meson decays we are interested in.

Read more

In the News

Panel probes new particle results

From BBC News, June 16, 2011

The head of the US' biggest particle physics lab has appointed an expert committee to establish whether or not a new, unanticipated sub-atomic particle has been detected by scientists.

Such a discovery, hinted at by experts in April, would mark one of the most radical changes to physics in years.

But separate science teams at the Tevatron accelerator are at loggerheads over the matter.

The Tevatron is the US rival to Europe's Large Hadron Collider (LHC).

The American machine is operated by the Fermi National Accelerator Laboratory (Fermilab) in Batavia, Illinois.

Two separate multi-purpose detectors - or experiments - analyse data from particle collisions at the Tevatron: DZero and CDF.

Each can cross-check the other team's discoveries.

The committee, set up by Fermilab director Pier Oddone, will aim to resolve the differences between scientists working on the CDF and DZero experiments.

Read more

Result of the Week

DZero updates tantalizing muon-antimuon result

The Standard Model predicts a value near zero for one of the parameters that is associated with the difference between the production of muons and antimuons in B meson decays. The 2010 and 2011 measurements are presented here with their uncertainty (the vertical bars). The two results are definitely different from zero and consistent with each other. The newer measurement has improved precision, as demonstrated by the shorter red bars.

About a year ago, DZero published a tantalizing new result in which the universe unexpectedly showed a preference for matter over antimatter. This afternoon, at 4 p.m. in One West, the DZero collaboration will present an update in a seminar that is geared toward particle physicists.

The 2010 measurement looked at muons and antimuons emerging from the decays of neutral mesons containing bottom quarks, which is a source that we have long expected is a fruitful place to study the behavior of matter and antimatter under high-energy conditions. The result was extremely exciting: The question of why our universe should exist solely of matter is one of the burning scientific questions of our time. Theory predicts that matter and antimatter was made in equal quantities. If something hadn’t slightly favored matter over antimatter, our universe would consist of a bath of photons and little else.  Matter wouldn’t exist.

In 2010, we found a 1 percent difference between the production of pairs of muons and pairs of antimuons in B meson decays at Fermilab’s Tevatron collider. Like all measurements, that measurement had an uncertainty associated with it.  Specifically, there was about a 0.07 percent chance that the measurement could come from a random fluctuation of the data recorded.  That’s a tiny probability, but when you look at thousands of measurements, you expect to see the occasional rare fluctuation that turns out to be nothing.  Scientists are a cautious bunch and require a higher standard to claim a discovery.  For a measurement of the level of certainty achieved in the summer of 2010, the best we’ll claim is that we have evidence for an unexpected phenomenon.  A claim of discovery requires a higher level of certainty.

Read more

Don Lincoln

These scientists worked on this rather difficult analysis.
DZero has recorded a luminosity of 10.11, in unfamiliar units called inverse femtobarns. This analysis uses about 90 percent of the data recorded by the DZero experiment thus far, a testament to the analyzers’ industry. The DZero collaboration would like to acknowledge the efforts of the Fermilab Accelerator Division, without which this analysis would not be possible.
Photo of the Day

A fine place to camp out

Be careful when you go on vacation – a little birdy might come visit your vehicle when you’re away. This happened in June with one of the vans for FESS Operations. Photo: Susan Quarto, FESS
Accelerator Update

June 27-29

- Three stores provided ~33.25 hours of luminosity
- Safety system testing performed site wide
- BRF16 sparking problems
- Switchyard vacuum problems
- NuMI target scans
- Tevatron cryo system wet engine work
- Meson FTBF experiment T-978 completed run
- Minor power glitch tripped off power supplies and other devices
- Booster off for RF work on June 29

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


Gym Open House - today

Open badminton

The Art of Applying to (Physics) Graduate School - July 6

10,000 Steps-A-Day heart rate watch winner

Preschool swim lessons

Aqua Tots registration deadline - July 1

Martial arts classes

International Folk Dancing meets in Ramsey Auditorium

Argentine Tango at Fermilab each Wednesday in Ramsey Auditorium

Fermilab Management Practices courses presented this summer

SciTech summer camps through Aug. 12

Change in cashier's office hours

Beginner swim lessons at pool

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