SLAC Today is
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In this issue:
Low-Alpha Mode Increases Possibilities at SSRL
Science Today: The Next Generation of RF Power Sources
Pief My Ride
Thursday - September 20, 2007 |
Low-Alpha Mode Increases Possibilities at SSRLSince the Stanford Synchrotron Radiation Laboratory (SSRL) began experiments in 1973, it has proven to be a bottomless well of scientific discovery. Now, a team of SLAC accelerator physicists is working to add new functionality to the SPEAR synchrotron accelerator. The team, comprising James Safranek, Xiaobiao Huang and Andrei Terebilo has tested a new "low-alpha mode" for SPEAR that results in shorter x-ray pulses that could be advantageous for some users. The path a particle travels around the 234-meter SPEAR ring can vary slightly because of minute differences in the energy of each electron in the beam. This causes accelerator magnets to create slightly different paths around the ring for each particle. Because the beam is actually 280 separate packets of particles—the length of which determines the length of pulses of x-rays created—the small variations in how far each particle travels—alpha—affects how short the pulses of x-rays can be made. Shorter x-ray pulses allow scientists to study tiny processes in extremely short time frames, such as the movement of molecules of liquid water. In fact, short x-ray pulses are one of the defining characteristics of the Linac Coherent Light Source (LCLS) project currently under construction at SLAC. Although SPEAR's x-rays are longer than those that will be created by the LCLS, they are less powerful and won't damage fragile samples. Read more... |
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The Next Generation
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Pief My RideFormer SLAC Director Pief Panofsky has obtained a lot of hardware over the years including the Matteucci Medal, the National Medal of Science, the Franklin Medal and the Ernest O. Lawrence Medal. And now he has been given the ultimate gift...a tricked-out ride. Pief's cart, now affectionately called the "Piefmobile," recently received a few custom upgrades courtesy of Ellie Lwin. Lwin secretly arranged to have SLAC paint shop pro Joe Staffordwith the help of George Sandovalapply custom-ordered flame decals and a license plate that reads "e-XLR8TR 2" to Pief's cart on his lunch break. She then surprised Pief with the newly decorated cart. "I went on the premise that it's easier to seek forgiveness than ask permission," said Lwin. "In the end, Pief loved it." But Lwin isn't done yet. She plans to put a matching license plate on the back, add flared tail pipes to the sides and take the NEV number off of the front. Meanwhile, Panofsky can be seen cruising around the lab in his new favorite method of transportation. |
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