SLAC Today is available online at:
http://today.slac.stanford.edu
In this issue:
Faster than a Speeding Femtopulse
Safety Today: Dosimeter FAQs
WIS Lecture Today: Antarctica 2.0: Where Did All the Ice Go?
Safety Seconds
![]() |
![]() |
Tuesday - November 28, 2006 |
Joe Frisch holds a miniature waveguide for use on the LCLS coherent radiation monitors. The pinhole-size opening is the same size as the wavelength of radiation emitted by a passing electron pulse. (Click on the image for a larger version.)
Faster than a Speeding FemtopulseWhen the Linac Coherent Light Source (LCLS) begins delivering x-rays in 2009, it will be one of the most powerful x-ray instruments ever built. From this power will come one of the LCLS's most intriguing applications: atomic-scale imaging. That's not easy. For researchers to produce x-rays with the right characteristics for gathering information on the atomic scalewhere events are measured in quadrillionths of a secondthe LCLS must first produce pulses of electrons that are extremely fast, faster in fact than typical instruments can measure. Regulation of the length and timing of these electron pulses will be crucial to any type of investigation of ultra-fast phenomena. But how do you go about measuring something that fast? Oscilloscopes are the standard signal measuring devices used to characterize laser pulses and are precise down to around 20 picoseconds. Although this is extremely fast (light travels a mere quarter inch in 20 picoseconds), pulses from the LCLS will last only about 100 femtoseconds (one quadrillionth of a second—the amount of time light takes to travel a hair's breadth). Read more... |
||
![]() |
||
![]() Dosimeter FAQs
Where at SLAC do I have to wear my dosimeter?
What training do I need to get a dosimeter? More dosimeter FAQs can be found on the ES&H website. |
WIS Lecture Today:
|
Events (see all | submit)
Access (see all)
Announcements
|
![]() |
||
![]() View online at http://today.slac.stanford.edu/ |