SLAC Today is
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In this issue:
Come to
Harold Shapiro's Talk
Science Today: KIPAC - Computer Simulations of Pulsars
Upgrading PeopleSoft Financial Applications
Electrical Safety Tip: Lock Out Tag Out Locks
Thursday - May 4, 2006 |
Come to Harold Shapiro's TalkThe National Research Council Report "Revealing the Hidden Nature of Space and Time—Charting the Course for Elementary Particle Physics" was made public on April 26th in Washington, D.C. It immediately provoked a storm of media interest. The New York Times, Economist, Chicago Tribune, Science, Nature and many other publications carried stories on the importance of this report to the future of particle physics in the U.S. The chairman of the EPP2010 committee, Harold Shaprio, has made an admirable personal commitment to explaining the main recommendations of the report. Please welcome him to SLAC by attending his talk in the Panofsky auditorium at 10:30 a.m. on Friday. Overflow seating will be available in the Orange Room. Don't miss this opportunity to hear about the compelling science ahead in particle and particle astrophysics and why the United States should continue to take a leadership role in these fields. |
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KIPAC: Computer Simulations of PulsarsMany astrophysical environments, particularly those involving strong magnetic fields, are very difficult to model from first principles. In the absence of detailed models astrophysicists resort to drawing such objects as cartoons or "artist's impressions." KIPAC researchers are changing this trend for the long standing problem of structure of pulsar magnetospheres. Pulsars are strongly magnetized rotating neutron stars that are observed to pulse as their magnetic axes pass the line of sight to Earth. Their magnetospheres are filled with streaming relativistic plasma, which makes calculating the structure of the magnetosphere intractable analytically. We have recently made progress by developing a new numerical method for this problem. The method, known as "Force-Free Magnetohydrodynamics," allows us to self-consistently solve for the behavior of strong electromagnetic fields in the presence of plasma. Three-dimensional numerical simulations performed on parallel computers at SLAC allowed for the first time to compute the shape of pulsar magnetic field lines for the general case where pulsar rotation and magnetic axes are misaligned (see above image). These solutions will be used to study the physics of gamma-ray emission from pulsars, which will be observed by the upcoming GLAST satellite. |
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