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In this issue:
FLASH Imaging Redux: Nano-Cinema is Born
Safety Today: Heat Illness Advisory

SLAC Today

Tuesday - July 8, 2008

FLASH Imaging Redux: Nano-Cinema is Born

Soft X-rays from the FLASH laser capture the action as a tiny silicon nitride wafer explodes.

Flash imaging of nanoscale objects undergoing ultrafast changes is now a technical possibility, according to a recent paper published in the June 22 edition of Nature Photonics. The results are a direct precursor to research that will be conducted using SLAC’s Linac Coherent Light Source (LCLS).

The experiments, carried out by a team of researchers that included SLAC scientists Sebastien Boutet, Janos Hajdu and Mike Bogan, used the Free-Electron Laser in Hamburg (FLASH laser) at Deutsches Elektronen-Synchrotron (DESY) in Germany. To create the images, an artificial sample—a silicon nitride wafer less than one thousandth the width of a human hair and etched with a simple nanoscale pattern—was shot with an optical laser, which ultimately caused the tiny wafer to explode. But less than a few billionths of a second (picoseconds) after the first laser—before the sample actually had a chance to disintegrate—a second, soft X-ray laser captured an image of the sample as the disintegration process began.  Read more...

(Column - Safety Today)

Heat Illness Advisory

With the thermometer approaching that 100 degree mark, Cal/OSHA is reminding all managers and supervisors to protect workers from heat illness.

"It's important to apply precaution and safety measures to all employees to prevent work-related heat illnesses and fatalities," said Len Welsh, Chief of Cal/OSHA. "It is especially important to track the weather and be ready for heat waves."

Cal/OSHA investigations reveal that the risk of dying from heat illness appears to be highest for employees who are new on the job and not accustomed to working in extreme heat. The body needs to adapt gradually to exertions in the heat and humidity. Most people adjust to the weather or acclimate within four-to-14 days of regular work levels, according to Cal/OSHA heat illness prevention data.

Employees should be encouraged to continuously drink water throughout the day and take frequent cool-down breaks or preventative recovery periods in the shade.

Employees who work indoors should take the same precautions as those who work outdoors in extreme heat, and follow similar measures.

More information on heat illness prevention is available on the Cal/OSHA website.

More information on beating the heat at SLAC can be found in the June 10 edition of SLAC Today.


Wells Wulsin presented a SASS lecture last April.
(Click on image for larger version.)

Are you at student working at SLAC? Do you ever wonder what research goes on outside your lab? Would you like a way to get to know the other young people at SLAC? The SLAC Association of Student Speakers (SASS) is a great way to get involved with the student community right here at SLAC, whether you are a theorist or experimentalist, a resident of the Bay Area or just visiting.

SASS was founded in January to provide a forum for scientific discussion among a community of student researchers. We have had talks on a wide variety of topics, such as testing SUSY models, career prospects in medical physics, visual modeling of astrophysical data, and new accelerator technology. We've had many great talks so far but are always looking for fresh ideas and new voices.

This Wednesday, July 9, SASS is holding a special organizational meeting in the Sierra room at 12:30 p.m. Please join us and bring ideas for topics for future talks. You are welcome to share anything from the latest results of your own research to a physics topic unrelated to work at SLAC that interests you. If there is any topic you would like to learn more about, come and suggest your ideas! We'll serve pizza and talk physics.

SASS usually meets Wednesdays at 12:30 p.m. in the Kavli Building. Come out to support your peers and learn about all the activity happening at SLAC and beyond. For more information, check out the SASS website.


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