|icc_2006_poster.pdf||2006-03-13 09:01:10||Chris Grabowski|
Field-Reversed Configuration (FRC) Adiabatic Compression-Heating Experiment at AFRL
Author: Chris Grabowski
Submitted: 2005-12-30 08:55:06
Co-authors: J. H. Degnan, M. T. Domonkos, D. Gale, T. P. Intrator, J. V. Parker, D. Ralph, R. M. Renneke, E. Ruden, W. Sommars, W. Tucker, P. J. Turchi, W. J. Waganaar, and G. A. Wurden
Air Force Research Laboratory
3550 Aberdeen Avenue SE
Kirtland AFB, NM 87117-5
An experiment to form, translate, and adiabatically compress a plasma in a Field-Reversed Configuration (FRC) is now being assembled at the Air Force Research Laboratory in Albuquerque, NM. Over the past five years, the AFRL has been working in close collaboration with Los Alamos National Laboratory’s FRC formation experiment, FRX-L. The AFRL experiment will reproduce the electrical properties of FRX-L to ensure that FRC’s of similar parameters are formed. After formation, the FRC will be translated into the interior of a 10-cm diameter, 30-cm long aluminum solid liner with a nominal 1-mm wall thickness. The Shiva Star Capacitor Bank will then be used to implode this liner and compress the FRC to magnetized target fusion (MTF) relevant densities and temperatures.
Based upon FRX-L’s present configuration, FRC formation in the AFRL experiment will require four separate capacitor banks. These banks include two slow rise-time banks to first establish both a bias magnetic field in a 10-cm diameter, 36- to 45-cm long theta discharge region and a higher-intensity cusp field at each end of this region. Inside the theta discharge region will be a 50 to 100 mTorr deuterium pre-fill that a fast bank will pre-ionize with an oscillating magnetic field comparable to the bias field. The last bank will drive a reverse field in the theta discharge region with an amplitude approximately 10 times greater than the initial bias field. This last bank will be crowbarred to lengthen decay time and FRC lifetime. To translate the FRC from the theta discharge region into the liner, one or two additional slow banks are needed to set up a guide field to the liner and a mirror field at the opposite end of the liner.
The present status of the AFRL compression-heating experiment will be discussed, along with relevant circuit parameters and hardware designs for the capacitor banks. A proposed design for the integrated theta discharge, translation, and liner regions will also be presented.