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In this issue:
SLAC Awards 2006 Globies
Science Today: ILC Milestone
Valuable Real Estate in the Research Yard

SLAC Today

Thursday - April 13, 2006

(Image - Globie)

SLAC Awards 2006 Globies

The 2006 Employee Recognition Awards ("globies") have been awarded this year to 33 deserving recipients across SLAC:

Ron Akre
Richard Altieri
Lauren Barbieri
Carol Bechtel
Scott Blankenship
Betty Eaton
Paul Emma
Laurie Escudero
Ute Hayes
Donna Hernandez
Maria Herraez
Carmella Huser
Diane Jenkins
Sharon Jensen
Hope Johnson
Peter Kim
Melinda Lee
Shannon Leone
Harvey Lynch
Regina Matter
Eddie McGee
Randal Melen
Martin Nordby
Joe Olszewski
Kevin Purcell
Liam Robinson
Joe Rogers
Erin Shatara
Martha Siegel
Yen Tran
Diana Viera
Keith Washington
Ken Zhou

The globie awards are about people promoting a positive, respectful, and harmonious work environment.  Read more...

(Daily Column - Science Today)

ILC Milestone

(Photo - ILC klystron) The three MW L-band (1.3 GHz) Klystron at End Station B. (Click on image for larger version.)

The International Linear Collider (ILC) group at SLAC recently achieved a milestone with the first generation of 1.3 GHz rf power at End Station B.

This comes a year and half after the decision that the ILC would use 1.3 GHz superconducting cavities for the main linacs. The then NLC—now renamed ILC—group switched from developing high frequency, short pulse rf technology for a SLAC-like linear accelerator (11.4 GHz, 1.5 microsecond), to the low frequency, long pulse rf technology chosen for the ILC (1.3 GHz, 1.5 millisecond).

To gain experience with the new technology, an rf source was assembled using a high voltage modulator borrowed from the Spallation Neutron Source in Tennessee, an SDI-legacy klystron purchased from an East Bay company and a low-power rf drive system built at SLAC. This configuration successfully produced 3 MW of rf power in 1-millisecond-long pulses.

Now that the initial tests are complete, the modulator is being upgraded to power ILC prototype 10 MW klystrons. The source will also be used to test input power couplers for the superconducting cavities and prototype normal-conducting cavities for the ILC positron accelerator.

Valuable Real Estate
in the Research Yard

By Heather Rock Woods

(Photo - FFTB)

Workers began dismantling the FFTB this week.  (Click on image for larger version.)

The narrow line of concrete that bisects the Research Yard is a fertile spot.

This is land the Final Focus Test Beam (FFTB) occupied for 13 years, starting underground where the linac ends and emerging through the giant concrete wall into the Research Yard.

It's the original home of Beam Line C and End Station C, which tran straight from the linac between End Station A and End Station B (where the owls have been nesting). End Station C was not a giant edifice like its neighbors, but was formed from stacked concrete blocks which shielded the beam line.  A 42-inch bubble chamber was hidden inside. End Station C was taken apart in 1990 to make way for the FFTB, just as the FFTB is now being removed to make way for the Linac Coherent Light Source.

This patch of ground does not like to hold still, literally or figuratively.

"The Research Yard floor moves out toward End Station B in the morning as the sun rises and heats it up, and then comes back toward End Station A as it cools," said Dieter Walz, who's been involved with the FFTB from planning through the final days of beam this month.

Had the millimeter-scale daily migrations of the earth gone unchecked, magnets would have moved off-center from the beam and ruined focusing efforts.   Read more...

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