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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

SLAC Today

Tuesday - February 3, 2009

First Undulator Test Lights Up the LCLS

The installation crew carefully guided a meters-long undulator into place for tests last week. (Photo by Lisa Grossman. Click for larger image.)

The 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:
Astronomy Then and Now

On Monday, February 9, Astronomical Society of the Pacific Executive Director Jim Manning will present "Anatomy of a Revolution: How Galileo Democratized the Sky." Thanks for Galileo and others, Manning says, the sky is "yours to discover." A long-time telescope aficionado and astronomy educator, Manning will discuss the revolution brought about by the telescope and how astronomy buffs worldwide can participate in 2009, the International Year of Astronomy. The colloquium will take place in Panofsky Auditorium at 4:15 p.m. and is open to all. See the colloquium announcement for additional details.

Around SLAC: An Undulator

(Photo - undulator)
(Photo by Brad Plummer. Click for larger image.)

A meters-long undulator sat atop its blue pedestals and gray girder during the SLAC staff tour of the Linac Coherent Light Source last fall (right). A similar undulator was installed temporarily last week for the first test run of an electron beam through the undulator's magnetic field to generate X-rays.


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