We developed a new technique to measure the electron beam energy centroid and spread. It takes advantage of a sharp feature in the Advanced Photon Source (APS) diagnostic: undulator spectrum, the drop-off in the angle-integrated flux near its fundamental photon energy. The measurement technique has a high resolution and is nearly independent of the storage ring lattice functions. In this work, ...

A laser-driven electron-storage ring can produce nearly monochromatic, tunable X-rays in the keV energy regime by inverse Compton scattering. The small footprint, relative low cost and excellent beam quality provide the prospect for valuable preclinical use in radiography and tomography. The monochromaticity of the beam prevents beam hardening effects that are a serious problem in quantitative ...

X-ray scanning microscopy relies on intensive nanobeams generated by imaging a highly brilliant synchrotron radiation source onto the sample with a nanofocusing X-ray optic. Here, using a Gaussian model for the central cone of an undulator source, the nanobeam generated by refractive X-ray lenses is modeled in terms of size, flux and coherence. The beam properties are expressed in terms of the ...

We have measured electron impact ionization (EII) for Fe forming Fe from below the ionization threshold to 1200 eV. These measurements were carried out at the TSR heavy ion storage ring. The objective of using a storage ring is to store the ion beam initially so that metastable levels decay, thereby allowing for measurements on a well-defined ground-level ion beam. In this case, however, some m...

The storage ring in the Siam Photon Source of National Synchrotron Research Center, THAILAND is the upgraded version of SORTEC storage ring. The magnet lattice structure is changed to obtain the low emittance and to include the long straight sections to provide space for the insertion devices. Therefore, a detailed analysis of the modified parameters of the synchrotron and betatron oscillations...

In this paper, the main contributions of this work include three aspects. First, the deployment on different datacenters of Impala which is a database based on Ring Distributed Hash. This thesis deploys Impala system on different datacenters across WAN or across regions. Second, the research of data storage and search method based on circular distributed hash. This thesis adopts distributed has...

Louisiana State University Center for Advanced Microstructures and Devices (CAMD) began a control system upgrade project in early 1997. At the time, the storage ring was controlled by a VAX/VMS system, primarily using CAMAC for I/O. The injector Linac was controlled by a separate VME/OS/9 system using custom I/O components. The storage ring control system has been replaced with a PC/Linux based...

The gas-phase photodissociation spectrum of pyrene dimer cations was recorded using a compact electrostatic ion storage ring (Mini-Ring) and analyzed Monte Carlo finite temperature simulations the electronic photoabsorption spectrum.

The angular distributions of the products of dissociative recombination of diatomic molecular ions are derived. The distributions are determined by the dominant partial waves of the captured electrons. For a single dominant wave, the neutral product distribution is described by the same spherical harmonic that describes the electron partial wave. The derived distributions take into account both...

We propose an effective method for polarising antiprotons in a storage ring by means of a parallel moving polarised electron beam. If their relative kinetic energy is adjusted to the order of 1 keV the probability for spin exchange is as large as 〈σPzz〉 ≈ 270 barn. Using a 80% polarised electron beam with a peak current of 1.2 A and an average of 32 mA a polarisation of the antiproton beam of 5...