SLAC Today is available online at:
In this issue:
New SPEAR3 Diagnostic Beamline Up and Running
Colloquium - Mark Ellisman: Imaging the Nervous System
Road to B35 and B81 Closed this Afternoon
Electrical Safety Tip: Cable Tray Upkeep

SLAC Today

Friday - May 19, 2006

(Image - SPEAR3 Diagnostic)
Streak camera images of SPEAR 3 bunch length with normal magnet settings (left) and optimized magnet settings (right).

New SPEAR3 Diagnostic Beamline
Up and Running

The diagnostic beamline at SPEAR3 opened for business in February and is already producing high quality measurements. SPEAR3 emits pulses of synchrotron radiation composed of photons with a range of wavelengths concentrated in the x-ray region, but extending to ultraviolet, visible and infrared as well.

The diagnostic beamline works with visible and ultraviolet wavelengths to quantify physical properties of the electron beam circulating in SPEAR3 that generates synchrotron radiation. Jeff Corbett, Cecile Limborg and members of the SSRL accelerator systems department spent several years constructing it.

One of the beamline's first jobs was to measure the time duration of individual photon pulses with a streak camera on loan from the Advanced Light Source in Berkeley.   Read more...

Colloquium Monday

Mark Ellisman: Imaging the Nervous System

(Image - Brain imaging) On Monday, May 22, Dr. Mark Ellisman will present the colloquium "The BIRN Project: Imaging the Nervous System."

The grand goal in neuroscience research is to understand how the interplay of structural, chemical and electrical signals in nervous tissue gives rise to behavior. Experimental advances of the past decades have given the individual neuroscientist an increasingly powerful arsenal for obtaining data, from the level of molecules to nervous systems.

Scientists have begun the arduous and challenging process of adapting and assembling neuroscience data at all scales of resolution and across disciplines into computerized databases and other easily accessed sources. These databases will complement the vast structural and sequence databases created to catalogue, organize and analyze gene sequences and protein products.

In this lecture, Ellisman will discuss several interdisciplinary databases including those led by his U.C. San Diego-based group. He will also touch on the National Institutes of Heath project to create a new framework for collaboration and data integration in the Biomedical Informatics Research Network (BIRN).

The colloquium will take place at 4:15 p.m. on Monday, May 22, in Panofsky Auditorium. All are invited to attend.  Learn more...

Road Closure Cancelled

(Image - Map) (Click on image for larger version.)

Today's edition of SLAC Today announced that the road to Building 035 and Building 081 (and associated trailers) would be closed from 4:00 p.m. to 8:00 p.m. today.  This closure has since been cancelled. The road is open.

Electrical Safety Tip:
Cable Tray Upkeep

(Image - Cable Tray) It doesn't take long after an installation is complete for additional cables to find their way into cable trays. New cables added to existing cable trays can present several hazards:

• An overloaded tray can exceed the mechanical load limits of the tray and its supports. It can also cause overheating; check the National Electric Code for fill levels.

• Cables of different insulation class need to be separated; remember that different classes have different fill levels.

• Nothing should ever be mounted to a cable tray.

• Cable trays and rack grounds should never be removed.

• Cables should be tied in place periodically to reduce pulling and stress.

• Tray covers should be replaced after work is completed.

If an installation job cannot be done properly, add a new tray.

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