SLAC Today is
available online at:
http://today.slac.stanford.edu
In this issue:
Engineering Big Upgrades
Science Today: SSRL: Five Images for the Price of One
Marguerite Shuttle to Increase SLAC Service
Photo of the Day: Progress Continues on Near Experimental Hall
Thursday - March 8, 2007 |
symmetry: Engineering Big UpgradesHow do you renovate a delicate, irreplaceable detector? Very carefully. During the last four months of 2006, the BaBar collaboration at SLAC successfully replaced a prematurely aging muon identification system. Creative and solid engineering played a big role in upgrading a detector that wasn't meant to be taken apart. Jim Krebs, BaBar's chief engineer for mechanical operations, spent five years on the project. "We had to figure out how to take everything apart." In August, crews opened the doors that protect the three-story-tall detector, exposing five layers of detection instrumentation and a nervous system of wires and cables. Graduate students disconnected and then lovingly tied, bundled, and organized the thousands of cables that blocked the way to the muon identification system. Read more... |
||
SSRL: Five Images for the Price of OneScientists at the Stanford Synchrotron Radiation Laboratory (SSRL) have demonstrated a novel approach for improving the efficiency of an x-ray microscopy technique that may in particular prove beneficial for imaging radiation-sensitive objects such as biological samples. The findings, published in the October 2006 issue of Applied Physics Letters, should enhance imaging of sensitive samples and improve imaging with future ultra-short pulsed light sources, such as the Linac Coherent Light Source. Using Fourier Transform Holography (FTH) with 1.58 nanometer wavelength "soft x-rays," the team of scientists extended the detection limit of high-resolution lensless imaging without increasing radiation exposure. FTH reconstructs a sample's microscopic image from its soft x-ray scattering pattern alone. With this lensless technique, coherent light scattered by a sample interferes with light scattered from a reference aperture to form a hologram. An image of the sample is analytically reconstructed from the hologram using a simple, direct process called a Fourier transformation. By illuminating several references with coherent x-rays, multiple holographic images of the specimen are reconstructed simultaneously. The group found that compiling holographic images from multiple reference sources improves image quality by minimizing noise from imaging systems. To learn more about this research see the full scientific highlight here. |
Marguerite Shuttle to Increase SLAC ServiceOn Monday, April 2, Caltrain will institute slight changes on morning southbound trains to help improve on-time performance. In response to these changes, Stanford's Marguerite shuttle will also adjust its morning schedule, with Line A and Line B Clockwise shuttles departing the Palo Alto station at 7:54 a.m. and 8:54 a.m., to meet the newly adjusted 7:51 a.m. and 8:51 a.m. Caltrain southbound Baby Bullets. In addition, the Marguerite will increase the frequency of its SLAC shuttle, with departures every 20 minutes. An updated schedule and route information will be posted on the Marguerite Route Map & Schedules webpage later this month. To learn more about these changes, visit Stanford's Parking and Transportation website. Photo of the Day:
|
Events (see all | submit)
Access (see all)
Announcements
|
| ||
<%
Response.AddHeader "Last-modified", getArticleDate()
'Response.AddHeader "Last-modified","Mon, 01 Sep 1997 01:03:33 GMT"
'Monday, December 06, 2010
%> View online at http://today.slac.stanford.edu/. |