|hyperv_icc2006_poster.pdf||2006-03-09 08:50:06||F. Dougl Witherspoon|
Dense Hypervelocity Plasma Jets for Fusion Applications
Author: F. Dougl Witherspoon
Submitted: 2005-12-21 12:16:41
Co-authors: A.Case, M.W.Phillips
HyperV Technologies Corp.
13935 Willard Road
Chantilly, VA 20151
High velocity dense plasma jets are under development for a variety of fusion applications, including plasma refueling, magnetized target fusion, injection of angular momentum into centrifugally confined mirrors, High Energy Density Physics (HEDP), and others. The technical goal is to accelerate plasma blobs of density >10^17 per cc and total mass >100 micrograms to velocities >200 km/s. The approach utilizes symmetrical injection of very high density plasma into a coaxial EM accelerator having a tailored cross-section geometry to prevent formation of the blow-by instability. The injected plasma is generated by up to 64 radially oriented capillary discharges arranged uniformly around the circumference of an angled annular injection region of the accelerator. AFRL MACH2 code modeling identified 2 electrode cross-section configurations that produce the desired plasma jet parameters. Experimental results will be presented in which 8 capillary discharges are fired in parallel with jitter of ~100 ns. Recent experimental tests have increased the number of capillaries fired in parallel to 64. The experiment is now transitioning to higher voltage switches to reduce jitter to a few 10's of ns, and installation of a suite of new optical and spectroscopic diagnostics is underway. The latter includes a PI-Max camera with 2 ns gate time, a 1x16 Hamamatsu PMT array, a high resolution spectrometer, and a laser interferometer. A turbopump stand is being installed to allow operation at much lower background pressure.
*This Research is funded by the DOE Office of Fusion Energy Science through Grants DE-FG02-04ER83978, DE-FG02-05ER54810, DE-FG02-05ER84189, and a subcontract through the University of California-Davis' Grant DE-FG02-03ER54732.