Status of Superconducting RF Linac Development for APT

This paper describes the development progress of high current superconducting RF linacs in Los Alamos, performed to support a design of the linac for the APT (Accelerator Production of Tritium) Project. The APT linac design includes a CW superconducting RF high energy section, spanning an energy range of 211 to 1030 MeV, and operating at a frequency of 700 MHz with two constant beta sections (beta of 0.64 and 0.82). In the last two years, we have progressed towards build a cryomodule with beta of 0.64. We completed the designs of the 5 cell superconducting cavities and the 210 kW power couplers. We are scheduled to begin assembly of the cryomodule in September 2000. In this paper, we present an overview of the status of our development efforts and a report on the results of the cavity and coupler test program.Comment: LINAC2000 THD1

ANALYZING THE RUNWAY CAPACITY OF COMPLEX AIRPORTS

This paper describes a simulation modeling system we have developed, called Airport Capacity Analysis Through Simulation (ACATS). Airport capacity, in the sense of the average throughput obtainable during periods of high demand, is determined directly by simulating a constant flow of arrivals and departures for hundreds of hours. The user interface for ACATS provides a fast way to set up the elements of the airport that are essential for calculating runway capacity. It also supports the use of Air Traffic Control (ATC) separation rules that may become feasible as technology improves. The software in the user interface automatically converts the data for any airport into a standardized set of files that are then processed by the ACATS simulation software. At the core of the ACATS software is a simulation engine that is common to all airport analyses. That means that the simulation is driven by data representing the ATC rules, runway layout, and demand characteristics. The output of ACATS includes an animation of the simulation, statistics about the observed throughput, and a set of graphical analysis charts. The animation and graphical results produced by ACATS are important tools in explaining the analysis to the end user and in validating the results of the simulation. This paper will describe 1) the ACATS user interface tool that permits the user to easily describe the problem, 2) the ACATS simulation module, and 3) the methodology that governs the ACATS algorithms

Gamma ray multiplicities in deep inelastic collisions for the Cu+Au 400 MeV system

International audienc

Dielectric relaxation and ferromagnetic resonance in magnetoelectric (Polyvinylidene-fluoride)/ferrite composites

In this work the dielectric properties and ferromagnetic resonance of Polyvinylidene- uoride embedded with 10 wt. % of NiFe2O4 or Ni0.5Zn0.5Fe2O4 nanoparticles are presented. The mechanisms of the dielectric relaxation in these two composites do not differ from each other. For more precise characterization of the dielectric relaxation, a two dimensional distribution of relaxation times was calculated from the temperature dependencies of the complex dielectric permittivity. The results obtained from the 2D distribution and the mean relaxation time are found to be consistent. The dynamics of the dielectric permittivity is described by the Arrhenius law. The energy and attempt time of the dielectric relaxators lie in a narrow energy and time region thus proving that the single type chains of polymer are responsible for a dispersion. The magnetic properties of the composites were investigated using the fer- romagnetic resonance. A single resonance line was observed for both samples. From the temperature dependence (100 K - 310 K) of the resonance eld and linewidth, the origin of the observed line was attributed to the NiFe2O4 and Ni0.5Zn0.5Fe2O4 superparamagnetic nanoparticles. By measuring lms at dif- ferent orientations with respect to the external magnetic eld, the angular dependence of the resonance was observed, indicating the magnetic dipolar in-plane interactions.This work was supported by Lithuanian Research Council under the project MIP-068/2012 and by FEDER through the COMPETE Program and by the Portuguese Foundation for Science and Technology (FCT) in the framework of the Strategic Project PEST-C/FIS/UI607/2011, project PTDC/CTM-NAN/121038/2010 and the project MateproOptimizing Materials and Processes, ref. NORTE-07 − 0124-FEDER-000037, cofunded by the Programa Operacional Regional do Norte (ON.2 O Novo Norte), under the Quadro de Referncia Estratgico Nacional (QREN), through the Fundo Europeu de Desenvolvimento Regional (FEDER). P. Martins thanks the FCT for the grant FCT-DFRH SFRH/BPD/96227/2013