SLAC Today is
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In this issue:
First Undulator Test Lights Up the LCLS
Colloquium Next Monday: Astronomy Then and Now
Around SLAC: An Undulator
Tuesday - February 3, 2009 |
First Undulator Test Lights Up the LCLSThe Linac Coherent Light Source reached another milestone last Wednesday evening, when a beam of electrons wiggled its way through a row of magnets and produced the instrument's first X-rays. Electrons first traversed the length of the LCLS in December, but until now there were no X-rays. "This is the first time we actually had an electron beam going through an undulator," said SLAC physicist Heinz-Dieter Nuhn, who has been with the project since 1991. "It's pretty exciting." The X-rays' saga began early Wednesday morning, when SLAC maintenance and construction crews mounted an 1800-pound series of magnets called an undulator to a girder about two-thirds of the way down the Undulator Hall. Before the crew could put the undulator on the girder, they had to make sure every piece of the girder was in the right spot. They took precise measurements of each component's position using a laser. This is normally a quick process, said Hans Imfeld, a survey engineer, but this time the team took extra care. They wanted to see if the weight of the undulator makes the girder move. Read more... Colloquium Next Monday:
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