SLAC Today is
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In this issue:
ANITA is Back in Business
Science Today: In Too DEEP: Tracking the Changes in Galaxy Clusters
2007 SERT Members Awarded Certificates
Gamma Ray Conference Begins Today at KIPAC
Blood Drive Today
Thursday - November 8, 2007 |
ANITA is Back in BusinessThe Antarctic Impulsive Transient Array (ANITA)—that plucky probe that visited SLAC last year before taking to the skies of Antarctica—is back in action. Last month, a schematic of ANITA and the ice target used to calibrate its antennae made the cover of the October 26 edition of Physical Review Letters, and next year NASA plans to send her back for round two over the south pole. According to SLAC physicist Pisin Chen, one of the investigators working with the ANITA team, the success of the original calibration experiments at SLAC in June of 2006 is proving how valuable particle accelerators can be in the field of astrophysics. "This is something SLAC should be proud of," Chen said. "Using a particle accelerator to study astrophysics is unique. The high-energy beam from SLAC's linac has such wonderful quality—it can be of great use to the astrophysics community." ANITA was designed to circle Antarctica tethered to a high-altitude balloon at more than 100,000 feet searching for evidence of ultra-high energy cosmic neutrinos, which generate radio waves when they strike the ice. ANITA researchers brought the detector array to SLAC for calibration tests involving the linac and 10 tons of ice to simulate the Antarctic signals. |
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In Too DEEP:
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Gamma Ray Conference Begins Today at KIPAC
"With our strong involvement in gamma-ray astronomy, we now have to start thinking about future instruments," says Stefan Funk, SLAC researcher and organizer of the workshop, which is expected to include around 75 scientists. Hiroyasu Tajima and Roger Romani also helped to organize the workshop. GLAST's anticipated lifetime will be 5 to 10 years. After that, Funk says, its scientific discovery potential is expected to decrease. A space telescope more advanced than GLAST would be expensive and extremely difficult to build, so Funk and many other astronomers are now considering a ground-based instrument. Currently there are three major ground-based gamma-ray instruments, which are capable of detecting gamma rays greater than 100 Terra-electron volts. Funk hopes that a future ground-based instrument would improve by an order of magnitude in sensitivity and also decrease the energy threshold to as low as 20 Giga-electron volts, an energy level currently not deeply studied. "There is a large number of theoretical predictions of what we could see there, we just don't know, but we will know better once GLAST is in orbit," Funk says. Of the meeting, Funk says, "It's meant to discuss, think about and describe the options we have for the future gamma ray instrument." By the end of the week, the scientists will have a better idea of instrument parameters such as the size and number of telescopes, the altitude at which to put it at, and how to build the Next Big Thing in gamma-ray astronomy. Blood Drive TodaySLAC will host a blood drive in the Panofsky Auditorium Lobby today from 8:00 a.m. until 3:00 p.m. This drive is open to all members of the SLAC community and the general public. To donate blood, you must: To schedule an appointment online, log onto the Stanford Blood Center website and click on "Find a Blood Drive." Then click on "Mobile Drive Scheduler" and enter SLA5323 in the "Sponsor Code" box. Click on the date of the drive and then follow the prompts to schedule your appointment. Appointments will be given priority, but walk-ins are always welcome! Please contact Lauren Barbieri with questions. |
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