SLAC Today is available online at:
http://today.slac.stanford.edu
In this issue:
Clearing Clouds
Safety Today: JHAMs:
It's All About The Details
Dish Area Reopens Following Fires
Safety Seconds
Tuesday - July 31, 2007 |
Clearing CloudsClouds might be welcome during a drought, but you definitely don't want them in your beam pipes. Researchers around the world are working out how to keep a section of the proposed International Linear Collider—the positron damping ring—clear of electron clouds. In curved sections of accelerators, such as a damping ring, the beam throws off synchrotron radiation that plows into the beam pipe walls, kicking up electrons embedded in the wall. The newly freed electrons get pulled along with the next bunch of positrons in the beam, but then some hit the wall, freeing so-called secondary electrons. Soon a cloud of electrons clogs up the beam pipe. "When the beam passes through a cloud, it's like a plane passing through turbulence," said Mauro Pivi, of SLAC's ILC Accelerator Design group. Read more... |
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JHAMs:
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Dish Area Reopens Following FiresStanford University has reopened the Dish walking paths, following a four-week closure necessitated by two brushfires that burned nearly 200 acres. The Dish paths may again close for short periods of time when the fire danger is high. Details on the status of the paths are available on the "Foothills Hotline" at (650) 926-0275 and at the Dish gates. University officials have been concerned about the safety of local residents and the thousands of people who use Dish paths because the fire danger has remained extremely high over the last several weeks. While fire and law enforcement officials have been investigating the cause of the two blazes, the university used the time during the closure to make improvements to reduce the risk of a catastrophic fire. Director of Community Relations Jean McCown said university crews have expanded and enhanced firebreaks in the foothills area. In addition, the university has initiated plans to install fire hydrants behind homes on Junipero Serra Boulevard. According to Stanford Public Safety officials, two juveniles sparked the June 25 grass fire that burned about 171 acres. The cause of the 20-acre fire in the foothills on July 5 is still under investigation. No homes or structures were damaged in either fire, and no residents were evacuated, but two firefighters at the second blaze were treated for heat exhaustion. Safety SecondsThe average person sees a beautiful warm, blue, friendly ocean in Hawaii. But living in it makes you realize that the ocean is predictably unpredictablelarge waves tend to show up in small groups every 10 to 20 minutesso you always look for the highest wet line on the beach/rocks and stay above it. And you never turn your back to the ocean. Every year we hear of a few fishermen along the California coast who perish by ignoring the same rules. |
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