SLAC Today is available online at:

In this issue:
ILC Innovation: Improving the Photocathode
Safety Today: SLAC Employee and Medical Personnel Save A Life
Terry Anderson Publishes Article in the Liberty County Times
symmetry: The Beauty of Super-K

SLAC Today

Tuesday - March 28, 2006

(Photo - Takashi Maruyama with cathode)
SLAC's Takashi Maruyama holds one of his cathodes. Image courtesy of Peter Ginter.

ILC Innovation: Improving the Photocathode

When built, the International Linear Collider (ILC) will generate one of the world's highest energy electron beams. And it will all start with an electron source called a cathode. This source releases the electrons when hit by laser and is the size of a nickel.

SLAC physicist Takashi Maruyama has spent twenty years studying photocathodes and is now working on one for the ILC. Using an innovative design for these crucial wafers, he has greatly increased their efficiency.

The ILC will require a high energy beam that is polarized, meaning that the electrons must all spin in the same direction.

Photocathodes are made of gallium arsenide, a semiconductor grown as a crystal. By itself, gallium arsenide polarizes a beam at about 50 percent. In 1991, Maruyama and his collaborators increased the polarization to 80%. For certain measurements, the improved polarization even allowed SLAC detectors to outperform CERN's LEP, which had 30 times more events. For the ILC, Maruyama is challenged to reach even higher polarization.  Read more...

(Column - Safety Today)

SLAC Employee and Medical Personnel
Save A Life

Last week, the staff at SLAC's medical department and a quick-thinking coworker saved a person's life. After falling sick at work, a SLAC employee decided to bike home to get some rest. However, a coworker stepped in before he could leave and insisted that they visit SLAC's medical office.

"The employee had a life threatening condition," said SLAC's Dr. Maria Gherman. "His coworker saved his life by bringing him to medical."

SLAC's medical personnel transported the employee to Stanford ER, said Gherman. He remains at Stanford Hospital, where his condition is now stable.

"Other coworkers should be engaged in doing something similar," said Gherman. "Many thanks to this person who showed such compassion and alertness."

ES&H Medical Department
Main Phone: x2281
Open: Monday - Friday,
          8:00 a.m. - 4:30 p.m.
Building 41, Room 135

Visit the SLAC medical department website...

symmetry: The Beauty of Super-K

The reconstruction of the Super-Kamiokande detector in Kamioka, Japan, nearing completion. Photo courtesy of Melissa Alexander

Recently I discovered that one of the most beautiful expressions of Japanese craftsmanship is neither a vase in a Tokyo museum nor a carving in a Kyoto temple. Instead, it rests deep inside a mountain in the Japanese Alps. Its beauty is a side effect of its design as its purpose is not intentionally aesthetic, although its intended targets are themselves arguably rather lovely. This giant, liquid extension of human vision, a Cherenkov detector in search of ubiquitous, elusive neutrinos, is like many finely made things the result of thousands of hours of human labor.  Read more in symmetry...

Terry Anderson Publishes Article in the Liberty County Times

(Photo - barn) Farmyard showing a barn built by Terry Anderson's grandfather in the early 1930's. Photo courtesy of Terry Anderson.

Graphic Designer Terry Anderson has published an article in the Liberty County Times, a local paper near his hometown. The article describes his family history and the people of the region.

Events (see all | submit)

(see all | submit)

 Lab Announcements

Community Bulletin Board

News (see all | submit)

dividing line
(Office of Science/U.S. DOE Logo)

View online at