NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
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etween 10,000 <strong>and</strong> 103,000. The effect of the plasma on the near-wall boundary layer conditions was evaluated at each of<br />
the Reynolds numbers <strong>and</strong> each of the three voltage levels. The corresponding power levels were between 15 <strong>and</strong> 25 W.<br />
Particle image velocimetry (PIV) was used to determine the 2D boundary layer characteristics of the flow. This research<br />
showed that the plasma discharges were able to dramatically increase the flow velocity near the wall; however, the plasma was<br />
unable to reattach an already detached boundary layer. Boundary layer traces were taken to validate the PIV results.<br />
Additionally, multiple manufacturing techniques were evaluated in an effort to make the electrodes more usable in turbine<br />
blade applications.<br />
DTIC<br />
Actuators; Boundary Layer Control; Boundary Layer Flow; Glow Discharges; Plasma Jets<br />
20060001844 Illinois Univ. at Urbana-Champaign, Urbana, IL USA<br />
Fast Multipole / Wavelet-IML Hybrids for Electromagnetic Analysis<br />
Michielssen, Eric; Cangellaris, Andreas; Chew, Weng; Jin, Jianming; Jul. 20, 2005; 19 pp.; In English<br />
Contract(s)/Grant(s): DAAD19-00-1-0464<br />
Report No.(s): AD-A440362; ARO-40911.1-EL; No Copyright; Avail.: Defense <strong>Technical</strong> Information Center (DTIC)<br />
In recent years, a variety of computational schemes have been developed that accelerate the iterative solution of the dense<br />
matrix equations that arise upon discretizing boundary integral equations pertinent to the description of electromagnetic<br />
scattering problems. These schemes largely fall into two categories: (i) fast multipole methods <strong>and</strong> (ii) wavelet/multiresolution<br />
schemes. The overall goal of this project is to develop <strong>and</strong> catalogue all practical hybrids between fast multipole solvers <strong>and</strong><br />
multiresolution schemes useful to the analysis of electromagnetic boundary value problems. To this end, we developed (i)<br />
hybrid plane wave time domain (PWTD) multiresolution schemes pertinent to the construction of PWTD schemes for lossy<br />
media, (ii) PWTD schemes for 2D environments, (iii) PWTD solvers for microstrip structures, (iv) PWTD schemes for<br />
low-frequency solvers, (v) PWTD schemes for quasi-planar environments, (vi) PWTD schemes for periodic kernels, (vii)<br />
Time-Domain Adaptive Integral (TD-AIM) kernels for solving timedomain integral equations, (viii) TD-AIM accelerated<br />
hybrid time domain integral equation SPICE based circuit solvers, <strong>and</strong> (ix) a novel multigrid accelerator for the full wave finite<br />
element analysis of electromagnetic phenomena. Each <strong>and</strong> every of these solvers uses a multiresolution framework, either in<br />
space, time, or space-time to accelerate a boundary integral or finite element solver pertinent to the analysis of electromagnetic<br />
radiation, scattering, or guidance problems beyond what is possible using vanilla fastmultipole methods.<br />
DTIC<br />
Electromagnetism; Multipoles; Wavelet Analysis<br />
20060002052 Fermi National Accelerator Lab., Batavia, IL, USA<br />
NEG Pumping Strip Inside Tevatron B2 Magnets<br />
Chen, A.; Hanna, B.; Anderson, T.; January 2005; 8 pp.; In English<br />
Report No.(s): DE2005-15017060; FERMILAB-CONF-05-144-AD; No Copyright; Avail.: National <strong>Technical</strong> Information<br />
Service (NTIS)<br />
Nonevaporable getter (NEG) pumping strips, 6.2-m long, were installed inside four Tevatron B2 magnets to improve the<br />
vacuum environment. This established A linear pumping scheme in the long, unbakable vacuum chamber. The total pressure<br />
was reduced significantly.<br />
NTIS<br />
Getters; Magnets; Particle Accelerators<br />
20060002053 Fermi National Accelerator Lab., Batavia, IL, USA<br />
New Pulsed Orbit Bump Magnets for the Fermilab Booster Synchrotron<br />
Lackey, J. R.; Carson, J. A.; Ginsburg, C. M.; Glass, H. D.; Harding, D. J.; January 2005; 8 pp.; In English<br />
Report No.(s): DE2005-15017061; FERMILAB-CONF-05-119-AD-TD; No Copyright; Avail.: National <strong>Technical</strong> Information<br />
Service (NTIS)<br />
The beam from the Fermilab Linac is injected onto a bump in the closed orbit of the Booster Synchrotron where a carbon<br />
foil strips the electrons from the Linac’s negative ion hydrogen beam. Although the Booster itself runs at 15 Hz, heat<br />
dissipation in the orbit bump magnets has been one limitation to the fraction of the cycles that can be used for beam. New<br />
0.28 T pulsed dipole magnets have been constructed that will fit into the same space as the old ones, run at the full repetition<br />
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