Neutron diffraction measurements have been made on Tbo.5Dyo.s and show initial ordering into a spiral antiferromagnetic phase (with decreasing temperature) and then into a ferromagnetic phase. The inter-layer turn angle changed from 35' to 2 3 O as the temperature moved from the NBel to the Curie temperature. In addition, a magnetostriction-related expansion of the c-axis of about 0.4 % was obs...

Location based applications have gained much attention in recent years mainly with the advent of mobile devices such as smart-phones, PC-tablets, and netbooks. These devices facilitate the position data collection and allows some applications to make use of this data. For instance, mobile search is taking advantage of the local information to improve the user experience. Among the most common l...

Xiaobiao Huang Beam Diagnosis and Lattice Modeling of the Fermilab Booster A realistic lattice model is a fundamental basis for the operation of a synchrotron. In this study various beam-based measurements, including orbit response matrix (ORM) and BPM turn-by-turn data are used to verify and calibrate the lattice model of the Fermilab Booster. In the ORM study, despite the strong correlation b...

1.1.1 Introduction For linear accelerators, a single bunch instability of a positron bunch due to electrons created by ionization of the residual gas was discussed in Ref. [1], where a coherent oscillation of both electrons and positrons grows from any small initial perturbation of the bunch distribution, e.g. from the statistical fluctuations due to the finite number of beam particles. This in...

Optics parameters at the interaction point, beta, x-y coupling, dispersion and their chromatic aberrations, seriously affect the beam-beam performance as is shown in experiments and simulations. The control of the optics parameters is essential to maintain the high luminosity in KEKB. They drift day by day, or before and after the beam abort. They were often monitored at intervals of the operat...

Most existing Global Positioning System (GPS)-based vehicle navigation systems (also termed route guidance systems) utilize distance within their turn-by-turn navigation directions. For example, a system might give a voice instruction like ”turn left in 0.2 mile”. However, human drivers usually use landmarks to help their navigation. Some previous research has shown that there are performance-r...