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In this issue:
The B-Factory Returns for its Last Hurrah
Colloquium Monday: The Tesla Electric Car
SLAC Welcomes New Employees
ILC NewsLine: U.S.-Manufactured Cavity Achieves High Gradient

SLAC Today

Monday - December 10, 2007

The B-Factory Returns for its Last Hurrah

(Photo - RF Ring)
During the B-Factory's last major downtime this fall, the vacuum group replaced almost 190 RF seals with this new model in PEP-II's High Energy Ring.

Beginning later today or tomorrow, the B-Factory will be running practically non-stop for 10 months, aiming for the endurance of a marathoner and the peak performance of a sprinter. Early this week, the PEP-II accelerator crew plans to begin circulating beams in the PEP rings after a three-month downtime, readying for collisions in the BaBar detector sometime this week.

This is the final run for the hugely successful B-Factory program, which will end on Sept. 30, 2008.

"Now that all the safety checks have been properly done, we're anxious to start up quickly and have a nice long and productive run," said John Seeman, head of the Accelerator Systems Division.

A small crew of PEP-II members, BaBar collaborators and operations staff will keep beams and data collection going throughout the SLAC holiday shutdown.  Read more...

Colloquium Monday

The Tesla Electric Car

The Tesla Roadster.
(Image courtesy of Tesla Motors.)

In this afternoon's colloquium, J. B. Straubel of Tesla Motors will discuss the engineering behind the company's all-electric car line. As Chief Technical Officer at Tesla Motors, Straubel directs the overall engineering of the Tesla powertrain including the battery, motor, power electronics, transmission and high-level software systems.

The Tesla Roadster, the company's first production vehicle, emits no exhaust. According to Tesla Motors, the roadster can accelerate from 0 to 60 mph in less than 4 seconds—with a top speed of 125 mph—and can go 245 miles without needing to recharge. The cost of powering the vehicle is estimated at 2 cents per mile.

The colloquium will take place at 4:15 p.m. today in Panofsky Auditorium. All are invited to attend.


SLAC Welcomes
New Employees

Image courtesy of Diana Rogers.
(Click on image for larger version.)

SLAC welcomed 16 new employees last week at orientation. From left to right, front to back, they are: Alan Kong, Marilyn Cariola, Eric Butcher Johnson, Danny Nguyen, Ritimukta Sarangi, Lance Lougee, Terrence McMahon, Marco Oriunno, Qingmin Zhang, Tanju Gleisberg, Brian Gerke, Sam Ferguson, Charles Mann, Petra Wehle, Suchitra Khandi and Jacqueline Walker.

ILC NewsLine: U.S.-Manufactured Cavity Achieves High Gradient

Damon Bice disassembles the AES2 cavity from the test stand for another round of electropolishing and vertical tests. (Image courtesy of JLab.)

Turkey, stuffing and pumpkin pie—all things you might appreciate on Thanksgiving. ILC scientists in the United States had something extra to be thankful for this year. On 21 November, the day before the Thanksgiving holiday in the US, a superconducting cavity manufactured by Advanced Energy Systems in Medford, NY, reached a high gradient of 32.6 megavolts per meter (MV/m) at Jefferson Laboratory. "This is the first US-built ILC nine-cell cavity to reach a gradient close to the ILC specification," said Rongli Geng, the lead scientist at JLab on the nine-cell high-gradient cavity processing R&D. JLab scientists are hopeful that the cavity, dubbed AES2, will reach an even higher gradient after further processing.

The target gradient for each ILC cavity is 35 MV/m, and ILC scientists around the world are working toward this goal. The AES2 gradient is significant because it demonstrates the increasing capabilities of US cavity vendors. In comparison to manufacturers in Europe and Asia, US vendors are considered new to the game and reaching a gradient of 32.6 MV/m shows significant progress. "This is a very encouraging result," said Fermilab's Shekhar Mishra. "It shows that a US vendor can produce an ILC-quality cavity. JLab is doing an excellent job in advancing the high gradient cavity processing R&D."

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