NSF’s Plasma Physics program. Presented by Steven J. Gitomer Program Director for Plasma Physics Physics Division, Mathematics & Physical Sciences Directorate National Science Foundation, MPS-PHY Arlington VA USA ([email protected]). Plasma Physics Program - Overview.
Thru end of FY13
NSF – PHY 1036140 – Walter Gekelman, PI
Experiments on Ionization Injection of Electrons into a Plasma Wakefield
Accelerator at FACET
Figure 1: A spectrometer image of two screens at the image plane of the magnetic spectrometer. The left frame shows the energy loss of the 20.35 GeV drive beam while the right frame shows both the unaffected beam charge at the initial beam energy and the accelerated beamlet at around 24 GeV. This beamlet has an energy spread of about 1% and contains about 30 pC of charge. The acceleration occurred in just 30 cm.
NSF – PHY 0936266 -- PI Chan Joshi; this work … University of California Los Angeles, CA, USA, Stanford Linear Accelerator Center, CA, USA, University of Oslo, Norway, Max Planck Institute for Physics, Munich, Germany
Optical nonlinearity in Ar and N2 near the ionization threshold … measured with 10 fs time resolution and micron space resolution … impacts for example propagation of intense laser pulses in gases
NSF – PHY 0904302 -- PI Howard Milchberg; this work … University of Maryland, College Park MD
Collaborative Research: Experimental and Theoretical Study of the Plasma Physics of Antihydrogen Generation and Trapping
NSF – PHY – 1202519 – Joel Fajans, Jonathan Wurtele, University of California - Berkeley
The times and vertical (y) annihilation locations (green dots) of computer simulated antihydrogen atoms in the ALPHA trap under the assumption that gravity for antimatter is 100 times stronger than for normal matter. As can be seen by the solid black line, the average position of the annihilations tends towards the bottom of the trap, especially at late times. The experimental data (red circles) shows no such trend. From Description and first application of a new technique to measure the gravitational mass of antihydrogen, Nature Comm., 4 1785, 2013
Two-particle distribution and correlation function for a 1D dusty plasma experiment
In this project, we devised an experiment that allows us to measure the quantities in the Liouville equation, for the first time. We did this by reducing the physical system so that it had only two particles, which were harmonically confined to move along one axis, and we used particles large enough to determine their positions and velocities by video imaging. This physical system is called a dusty plasma. From the measured velocities of the particles, we determined the two-particle distribution function f2. We also calculated the more common one-particle distribution function f1 for each particle, allowing us to calculate the correlation function g2 = f2 – f1 f1. Unexpectedly, we found that g2 is dominated by coherent modes. Previously g2 was known only in theory for collisional processes, where it was always assumed to be dominated by randomness.
NSF – PHY – 1162645 – John Goree, PI – this work was published in PRL with co-authors Amit K. Mukhopadhyay and J. Goree– University of Iowa