SLAC Today is available online at:
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In this issue:
Triggering ATLAS
Safety Today: Dealing with Change
Word of the Week:
"Current"
McCallum-Turner Considers ES&H
Tuesday - September 18, 2007 |
Triggering ATLASWhen the Large Hadron Collider (LHC) begins scientific experiments in Geneva next year, bunches of 100 billion protons will cross paths 40 million times every second in the A Toroidal LHC ApparatuS (ATLAS) experiment. Although not every proton will collide with another, roughly 2 billion of them will. If each collision were recorded, the data would fill 6 million CDs every minute. There is no physical way that scientists could record that much information, but that's okay. They don't want to. Not every event at ATLAS will contain "new" physics that scientists want to record, so there should be enough computer storage space to save these. But choosing which events to keep and which to ignore is a major challenge. "Triggering" software, which separates the best from the rest, has been around for decades. Not only does the software have to be fast, making decisions of whether or not to record an event in 40 microseconds, it has to be accurate. Throwing away events showing new particles being created would undermine the entire experiment. These are the challenges and pressures that SLAC physicists Sarah Demers and Ignacio Aracena face on a daily basis as they program triggers for the ATLAS experiment. "It's a major challenge to balance the speed of the algorithms with their accuracy," said Aracena. "But it's a lot of fun." Read more... |
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Dealing with ChangeLast week, SLAC employees were notified of substantial changes within the lab's operational and science research structure. Although change is constant and normal within organizations, SLAC recognizes that people may become uncertain and stressed, especially during times of rapid change. In some cases, employees may have questions and may not know where to turn to for assistance and guidance. The Human Resources Department suggests that employees discuss any issues with their Department Head or Group Leader. In addition, employees may come to Human Resources for counseling and/or available information regarding the changes at the lab. Lee Lyon, (x2283), Carmella Huser, (x2358) and Barry Webb (x2355) are available for conversation regarding the changes. Anyone at SLAC may contact them directly to set up an appointment. Stanford University and SLAC also provide many areas for assistance with concerns. The Stanford Faculty and Staff Help Center is available for counseling and consultation free of charge. To make an appointment, simply give the Help Center a call at 650-723-4577 or send an e-mail to helpcenter@lists.stanford.edu. |
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