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In this issue:
Don't Rain on My Parade: Groovy beam pipe insert averts electron cloud formation.
Free Electronics Recycling Event
Stanford Pioneers in Science

SLAC Today

Monday - October 6, 2008

(Photo - grooved beam pipe insertion)
This insert, manufactured by SLAC and the company EMEGA, will be placed inside the KEK-B accelerator beam pipe to trap stray electrons with its triangular grooves. (Photo by Mauro Pivi. Click for larger image.)

Don't Rain on My Parade

Groovy beam pipe insert averts electron cloud formation.

As accelerators around the world increase in power, clouds become more and more of a problem. These are not thunder clouds sending lightning bolts at power supplies, but rather electron clouds: a haze of electrons that gathers in accelerator beam pipes and disrupts positron or proton beams. Now, researchers at SLAC and KEK are using the positron beam at KEK's B Factory in Japan to test one promising technique to clear these clouds.

Electron clouds begin to form when a stray electron strikes the interior wall of the beam pipe, producing two electrons. "In turn, those electrons strike the wall, and from two they become 4, then 8, then 16, then 32," said SLAC researcher Mauro Pivi. "And soon, an electron cloud forms." The cloud attracts the positively-charged beam traveling through the pipe, causing the beam to behave erratically—not ideal when the end goal is to very accurately collide two particle beams.  Read more...

Free Electronics Recycling Event

(Photo - computer waste)
Image courtesy of the EPA.

SLAC will host a free recycling event for employee household electronic waste October 14-16. Employees can bring items to the event, located in the Centralized Hazardous Waste Storage Yard in the parking lot behind Building 447 (map) from 8:00-10:00 a.m. and 12:00-1:30 p.m.

Electronic waste, or "e-waste," includes electronic products such as computers, televisions and VCRs that have come to the end of their useful lives. According to the State of California, electronic discards make up one of the fastest-growing segments of our nation's waste stream. Some electronics contain hazardous substances such as lead, mercury and cadmium, that must be properly managed to avoid impact the environment. For more information on e-waste and useful resources, see "E-waste Recycling Tips."

For more details, requirements and acceptable materials, see the Event Web page. Please direct questions to Ardie Jacob (x5059) or Micki DeCamara (x2348). 

Note: No SLAC/government property will be accepted in this event; please coordinate its reuse or recycling with Property Control/Salvage Warehouse (x2329).

Stanford Pioneers in Science

(Photo - Sidney Drell)
Sidney Drell will be the honoree at the inaugural Stanford Pioneers in Science public event. (Photo courtesy of Stanford University.)

This fall, Stanford University's Continuing Studies Program, in partnership with the Stanford Historical Society, launches the 2008–2009 Pioneers in Science free public event series, featuring distinguished faculty from across the university. The 2008 series will include interviews with SLAC Director Emeritus Burton Richter and SLAC Deputy Director Emeritus and Hoover Institution Senior Fellow Sidney Drell, among other thought leaders.

At each Tuesday evening event, an accomplished colleague will introduce the honoree, setting the background and context for his or her accomplishments. An interview with the honoree will follow, exploring his or her career and contributions to science and society.

The first event will take place at 7:30 p.m. on October 21 in Stanford's Cubberly Auditorium, with Sidney Drell. For details see the event Web page. For the full 2008–2009 lineup, see the Pioneers in Science Web page.


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