A simple apparatus for achieving beam sizes in the range 5-10 μm on a synchrotron beamline was implemented in combination with a small 125 x 25 μm focus. The resulting beam had sufficient flux for crystallographic data collection from samples smaller than 10 x 10 x 10 μm. Sample data were collected representing three different scenarios: (i) a complete 2.0 data set from a single strongly diffra...

The basic requirement for the BEPC beam position monitor is the measurement of the beam orbit with 0.1 mm precision near the collision point. To improve the measurement accuracy, the response of the beam position monitor pickups was mapped in the laboratory before they were installed in the BEPC ring. The microcomputer-controlled test set consists of high frequency coaxial switches to select ea...

The impedance spectrum presented by the PEP-I1 RF cavity to the beam is calculated using a 3D MAFIA model which includes the damping waveguides and the input coupler. The simulation assumes that all the ports leading out of the cavity, including the beam pipes, are terminated in matched loads. The effect of the external loading on the longitudinal impedances will be examined. This study takes i...

We analyze particle diffusion and edge emittance growth induced by discreteparticle effects in two-dimensional self-consistent simulation studies of beam dynamics. In particular, an analytical model is presented which describes the slow-time-scale evolution of the edge emittance of a perfectly matched beam in a periodic solenoidal magnetic field. A scaling law for edge emittance growth is deriv...

I discuss a few of the recent developments in nuclear reactions at very low energies with emphasis on the role of radioactive beam facilities.

This paper proposes the 2.45 GHz planar Beam Steering Antenna Array for Indoor Positioning Systems. The antenna array consists of a phase shifter based on 4 × Butler matrix, and an four dipole Yagi antennas. By choosing one beams using switching controller, main beam can steer in directions from +37°, –12°, +12° to –36°. has narrow fan wit...

Electrons generated and accumulated inside the beam pipe form an ‘electron cloud’ that interacts with a charged particle beam. If the number of electrons is sizable, this beam-cloud interaction can give rise to a two-stream instability, resulting in beam loss or emittance growth. The instability can occur within a single bunch, e.g., passing through the cloud on successive turns in a storage ri...

Free vibration characteristics of continuous grading fiber orientation (CGFO) beams resting on variable Winkler and two-parameter elastic foundations have been studied. The beam is under different boundary conditions and assumed to have arbitrary variations of fiber orientation in the thickness direction. The governing differential equations for beam vibration are being solved using Generalized...

We have developed an electron cloud module and implemented it in the ORBIT Code for beam dynamics in high intensity rings. In addition to studying the dynamics of the electron cloud, our intent in developing this model is to examine the effect of the electron cloud on the protons. In this presentation, we examine benchmarking and initial applications of the ORBIT electron cloud module to SNS. S...