The present study of the interstellar formyl ion HCO/sup +/ is the first attempt to investigate dissociative recombination for a triatomic molecular ion using an entirely theoretical approach. We describe a number of fairly extensive electronic structure calculations that were performed to determine the reaction mechanism of the e-HCO/sup +/ process. Similar calculations for the isoelectronic ions HOC/sup +/ and HN/sub 2//sup +/ are in progress. 60 refs.

The interaction of energetic electrons with highly charged ions is of great importance to several research fields such as astrophysics, laser fusion and magnetic fusion. In spite of this importance there are almost no measurements of electron interaction cross sections for ions more than a few times ionized. To address this problem an electron beam ion trap (EBIT) is being developed at LLNL. The device is essentially an EBIS except that it is not intended as a source of extracted ions. Instead the (variable energy) electron beam interacting with the confined ions will be used to obtain measurements of ionization cross sections, dielectronic recombination cross sections, radiative recombination cross sections, energy levels and oscillator strengths. Charge-exchange recombinaion cross sections with neutral gasses could also be measured. The goal is to produce and study elements in many different charge states up to He-like xenon and Ne-like uranium. 5 refs., 2 figs.

Here the authors present a possible way to further increase the energy of SLAC single bunch from 50 GeV to 65 GeV or even more, without increasing the rf peak power and accelerator length.

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.

The task force has studied two options for an 8 T ring operating at 2 K. In the first of these the synchrotron light load is taken at 2 K, and in the second it is intercepted on a bore liner at 4.5 K. The possibility of staged construction of the 20 Tev, 8 T, 2 K ring with initial operation at 15 Tev, 6 T and 4.5 K has also been considered. A set of dimensions and specifications has been developed for each of the two 8 T options in the three categories: magnets, cryostat, and refrigeration system with the object of providing for a detailed cost comparison with the 6 T, design D ring. Cost information for refrigeration systems that are not strictly comparable to design D have been developed from component quotations. A very preliminary discussion of costs is included in the report. A summary of the principal findings of the task force is as follows: the temperature at which a 6 T, 4.5 K magnet will operate at 8 T with the same critical current safety margin is found to be 2 K; an increase of 0.5 cm in the magnet inner diameter is found to …

Compilation of monthly reports from departments in the city of San Antonio, Texas providing statistics, project updates, and other information about services and activities.