Alpha Channeling with High-field Launch of Lower Hybrid Waves

Although lower hybrid waves are effective at driving currents in present-day tokamaks, they are expected to interact strongly with high-energy particles in extrapolating to reactors. In the presence of a radial alpha particle birth gradient, this interaction can take the form of wave amplification rather than damping. While it is known that this amplification more easily occurs when launching from the tokamak high-field side, the extent of this amplification has not been made quantitative. Here, by tracing rays launched from the high- field-side of a tokamak, the required radial gradients to achieve amplification are calculated for a temperature and density regime consistent with a hot-ion-mode fusion reactor. These simulations, while valid only in the linear regime of wave amplification, nonetheless illustrate the possibilities for wave amplification using high-field launch of the lower hybrid wave.Comment: 7 pages, 7 figure

Multi-Dimensional Ideology in the Multi-Member District: An Analysis of the Arizona Legislature

http://www.truman.missouri.edu/ipp/publications/index.asp?ViewBy=DateAmerican state legislatures provide considerable institutional variation for testing theories of legislative representation, and one such feature is the multi-member district system (MMD). Whereas the U.S. House and most American state legislatures use the single member district system (SMD) in which a single legislator represents one geographic district, several state legislatures still use a system in which more than one legislator is elected from the same district in the same election. Although there can be considerable variation in the rules for such MMDs, one structure common to many state legislatures is a situation in which multiplecandidates run against each other for two seats from one district, and the two receiving the most votes are elected. Clearly, the electoral game is quite different in a situation in which a candidate is likely to be running against not only members of other parties but also another candidate of the same party. The incentives inherent in such a system are quite different than those for a legislator in an SMD, and it likely that such incentives change legislative representation in a number of ways.Includes bibliographical reference

The Political Cost of Public-Private Partnerships: Theory and Evidence from Colombian Infrastructure Development

Infrastructure public–private partnerships (PPPs) eschew traditional public management to provide distributive goods worldwide. Yet, in Colombia, the context of our study, both the promise of and voters' experience with PPPs hinder incumbent parties in elections when theories of distributive politics expect otherwise. We argue that negative experiences with PPPs introduce a sociotropic turn in individual voting: bad experience crowds out the possibility that promising a new project will improve a voter's own welfare. Studying what are, to our knowledge, all 109 Colombian PPP projects between 1998 and 2014, and over 8,700 individual survey responses, our evidence shows that vote intention for the incumbent executive or his party decreases as experience with more PPPs in respondents' districts increases. Our analysis and results introduce an important agenda for research into the political significance of these legacies of new public management

The Peak Brightness and Spatial Distribution of AGB Stars Near the Nucleus of M32

The bright stellar content near the center of the Local Group elliptical galaxy M32 is investigated with 0.12 arcsec FWHM H and K images obtained with the Gemini Mauna Kea telescope. Stars with K = 15.5, which are likely evolving near the tip of the asymptotic giant branch (AGB), are resolved to within 2 arcsec of the nucleus, and it is concluded that the peak stellar brightness near the center of M32 is similar to that in the outer regions of the galaxy. Moreover, the projected density of bright AGB stars follows the visible light profile to within 2 arcsec of the nucleus, indicating that the brightest stars are well mixed throughout the galaxy. Thus, there is no evidence for an age gradient, and the radial variations in spectroscopic indices and ultraviolet colors that have been detected previously must be due to metallicity and/or some other parameter. We suggest that either the bright AGB stars formed as part of a highly uniform and coherent galaxy-wide episode of star formation, or they originated in a separate system that merged with M32.Comment: 9 pages of text, 3 figures. ApJ (Letters) in pres