No abstract available

[en] This final report is comprised of the following six progress reports: Ion Temperature Gradient Instability and Anomalous Transport, July 1989; Ion Temperature Gradient Instability and Anomalous Transport, August 1991; Ion Temperature Gradient Instability and Anomalous Transport, July 1993; Ion Anomalous Transport and Feedback Control, May 1994; Ion Anomalous Transport and Feedback Control, April 1995; and Ion Anomalous Transport and Feedback Control, December 1997

[en] This report discusses experiments in ion temperature gradient instability and anomalous transport in the CLM steady state device. (LSP)

[en] Several closed configurations consisting of interconnected linear theta pinches are proposed which may considerably reduce their end losses. (auth.)

[en] It is shown that by suitably pulsing a magnetic mirror end plug of a linear theta pinch, one can substantially reduce the end loss. A system consisting of a linear pinch with sequentially pulsed multimirror end plugs is proposed which shows promise of fusion feasibility. (author)

[en] We study electronic transport in a one-dimensional ordered chain in the presence of either absorption or amplification at each site (the site-potential having an imaginary positive or negative part) within a single-band tightbinding Hamiltonian. The spectrum in either case for the isolated (closed) quantum system is found to become broader compared to the regular Bloch case where there is no absorption or amplification at any site. Interestingly for the transport through an infinitely long ordered chain (open quantum system), the reflectance saturates to a value greater (lesser) than unity in the amplifying (absorbing) case and the transmittance decays to zero in either case. This fact implies that the transmittance does not grow indefinitely even for an ordered, amplifying (active or lasing) medium and that it is not necessary to have any disorder or interaction induced confining mechanism on the transmitted wave, so as to achieve an amplification in the backscattered wave. (author). 8 refs, 2 figs

No abstract available

No abstract available

[en] The concept of transfer function which is so valuable for lumped dynamical systems is developed for plasma problems. Methods of construction of transfer functions for problems with boundary excitation as well as internal excitation are discussed. (auth)

[en] The Columbia Linear Machine has been redesigned to enter the parameter regime of the collisionless, curvature-driven, trapped-particle instability. With the new machine configuration, a strong (n/N > 60%), coherent mode is observed which bears all the characteristics of this instability. These include strong localization to the mirror cell, broad radial-mode structure, and MHD-like body motion of the plasma column. Furthermore, the mode exhibits all the correct parametric dependences of increasing mode amplitude with increasing mirror ratio and rf power, and decreasing mirror-cell length