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In this issue:
symmetry: Talk and Chalk
People Today: Michael Levashov: Wired for Science
Cranking out the Undulators
Energy Tip of the Week
Wednesday - August 15, 2007 |
symmetry: Talk and ChalkTheorists can't help it: When asked to explain something, they reach for a piece of chalk. The language of math and physics seems to require a writing implement and a large vertical surface. For two centuries, scientists have turned to blackboards to grapple their thoughts into coherent equations and to intellectually commune with like-minded people. You can't describe supersymmetry by waving your hands. You can't quickly draw a magnet layout for a student using a graphics program. While the world at large is converting to whiteboards, the iconic blackboard still holds a fond and prominent spot wherever theoretical physicists gather—in hallways, auditoriums, and meeting rooms of old buildings and new. "A lot of what theorists do is very creative. We need to talk and interact with each other. Drawing diagrams is a very efficient way to communicate," says SLAC Theorist JoAnne Hewett. Read more... |
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Michael Levashov:
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Cranking out the UndulatorsSince last fall, SLAC's Magnetic Measurement Group has been a mill of activity preparing undulators for the Linac Coherent Light Source (LCLS). In all, 40 undulator magnet arrays have arrived from Argonne National Laboratory, which was responsible for the design of these and other LCLS magnets. So far, SLAC engineers have meticulously tuned 11 of the undulators. Each array comprises rows of ceramic permanent magnets with an adjustable gap through which the LCLS beam pipe will pass. Scott Jansson (pictured above) uses wedged metal shims to adjust the pole assemblies based on measurements of the field strength between the gaps. Jansson adjusts the shims manually, however even "rough tuning" using this approach allows adjustment to a precision of just a few micrometers. After rough tuning, the undulator is taken to a second test stand for even finer adjustments. Energy Tip of the WeekA significant amount of energy is required to cool (or heat) outside air to comfortable indoor temperatures, so please keep your building's exterior and freight doors closed as often as possible. |
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