FED-A, an advanced performance FED based on low safety factor and current drive

This document is one of four describing studies performed in FY 1982 within the context of the Fusion Engineering Device (FED) Program for the Office of Fusion Energy, U.S. Department of Energy. The documents are: 1. FED Baseline Engineering Studies (ORNL/FEDC-82/2), 2. FED-A, An Advanced Performance FED Based on Low Safety Factor and Current Drive (this document), 3. FED-R, A Fusion Device Utilizing Resistive Magnets (ORNL/FEDC-82/1), and 4. Technology Demonstration Facility TDF. These studies extend the FED Baseline concept of FY 1981 and develop innovative and alternative concepts for the FED. The FED-A study project was carried out as part of the Innovative and Alternative Tokamak FED studies, under the direction of P. H. Rutherford, which were part of the national FED program during FY 1982. The studies were performed jointly by senior scientists in the magnetic fusion community and the staff of the Fusion Engineering Design Center (FEDC). Y-K. M. Peng of the FEDC, on assignment from Oak Ridge National Laboratory, served as the design manager

Copper-mediated 3-N-Arylation of Flavin

A generally applicable method for the direct 3-N-arylation of flavins using arylboronic acids and copper acetate was developed. The reaction conditions were optimized considering the lability of flavins in basic conditions and thermal heating. Donor- and acceptor-substituted arylboronic acids were used yielding 3-N-arylflavins in moderate to good yields by C(aryl)-N(imide) bond formation. UV and fluorescence measurements indicate an ortho­gonal orientation of the additional aromatic substituent to the flavin ring system. The arene substituent is not electronically coupled to the flavin π-system in the ground state, but electron-rich arene substituents in 3-N position significantly reduce the flavin emission intensity

Neutral two-dimensional organometallic–organic hybrid polymers based on pentaphosphaferrocene, bipyridyl linkers and CuCl

The reaction of the P-n ligand complex [Cp* Fe(eta(5)-P-5)] (1: Cp* = eta(5)-C5Me5) with CuCl in the presence of 4,4'-bipyridine or 1,2-di(4-pyridyl) ethylene leads to the formation of three unprecedented neutral 2D organometallic-organic hybrid networks, the constitutional isomers [Cu2Cl2{Cp* Fe(mu(3), eta(5:1:1)-P-5)}(mu, eta(1:1)-C10H8N2)](n) (2 and 3) and the coordination polymer [(CuCl)(2){Cp* Fe(mu(3), eta(5:1:1)-P-5)}( mu, eta(1:1)-C12H10N2)](n) (4) with isomeric square (2 and 3) and honeycomb (4) layer topologies

Composition analysis of oxidized buried SiC layers in silicon from EFTEM images

Energy filter transmission election microscopy (EFTEM) is used to investigate the composition of a Si/SiOx/SiC multilayer structure formed by ion-beam synthesis. The implanted dose is used as a standard for the quantification of the elemental maps. The carbon redistribution upon the oxidation of SiC is monitored. (C) 2001 Elsevier Science Ltd. All rights reserved

Facile synthesis of one-dimensional organometallic–organic hybrid polymers based on a diphosphorus complex and flexible bipyridyl linkers

The selective synthesis of a series of new "ladderlike'' onedimensional organometallic-organic hybrid polymers is shown. The polymers are obtained from the reaction of the diphosphorus ligand complex [Cp2Mo2(CO)(4)(eta(2)-P-2)] with the copper salt [Cu(CH3CN)(4)]BF4 in the presence of flexible organic bipyridyl linkers in high selectivity. This unique behaviour is supported by DFT calculations

Plasma engineering considerations for an ignition test reactor: The Next Step (TNS) beyond TFTR

Plasma engineering studies were done to establish credible ranges of physics parameters to be integrated into the TNS study program. The following are reviewed: high ..beta.. equilibrium, high density, basic assumptions, zero-dimensional scaling, one-dimensional effects, equilibrium evolution, injection scenario, MHD stability limits, equilibrium fields and flexibility. (MHR