Thursday - April 13, 2006

SLAC Awards 2006 Globies

by Larissa Williams

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

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

ILC Milestone

by Chris Adolphsen

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

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...

Events (see all | submit)

• April 13: (9:00 a.m.) Programmable Electronic Safety Systems Workshop
• April 13: (4:00 p.m.) Accelerator Seminar
• April 13: (4:15 p.m.) ACKS Seminar - Maxim Markevitch
• April 14: (12:30 p.m.) Theory Seminar: Santosh Kumar Rai-Associated photons and new physics at LCs

Access (see all)

• 4/3 - 6/1: Short Spur Road Off North Access Road Closed
• 3/31 - 4/30: Gate 17 Hours Extended During Alpine Gate Shutdown
• 3/28 - 4/30: Intermittent Narrowing of Loop Road Near Bldg. 35 and 81
• 3/27 - 4/28: Alpine Gate Temporarily Closed
• 1/01 - 4/17: Loop Road Near Kavli Building Temporarily Closed
• 1/01 - 4/30: North Gallery Road Closed at Sector 20

Announcements
(see all | submit)

 Lab Announcements

• Ashley Career Development Fellowship Workshop Today

Community Bulletin Board

• President Hennessy's Academic Council
• Harold Morales' retirement party
• Invest for your retirement

News (see all | submit)

• Jefferson Lab Contract to be Awarded to Jefferson Science Associates Interactions.org
• Gases in One Dimension—Not Your Typical Desk Toy Penn State
• Let there be light Nature
• 'Standard' star not so standard after all New Scientist

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What's Cookin' at the Linear Cafe (see weekly menu)

Thursday
Breakfast Boosters	Breakfast frittata with breakfast potatoes and smoked bacon	$4.73
Hot	Chicken gumbo or roasted garlic and zucchini soup	$2.35/$2.95
Taste	Roasted leg of lamb or BBQ half chicken with roasted corn, red potatoes and vegetables	$5.95
Good Food For You	Ricotta and spinach cannelloni served with vegetables and garlic foccacia	$5.65
Tossed	Chicken cobb salad	$5.25
Panini	Pork loin, mango chutney, jack cheese and mixed greens	$5.45
Sandwich Favorite	Baja-style fish tacos	$5.85