RF system of the SPring-8 storage ring

1998 ◽  
Vol 5 (3) ◽  
pp. 379-381
Author(s):  
Hiroyasu Ego ◽  
Masahiro Hara ◽  
Yoshitaka Kawashima ◽  
Yuji Ohashi ◽  
Takashi Ohshima ◽  
...  
Keyword(s):  
Storage Ring ◽  
Cooling Water ◽  
Higher Order ◽  
Synchrotron Radiation Beam ◽  
Order Mode ◽  
Coupling Impedance ◽  
Radiation Beam ◽  
Rf System ◽  
Higher Order Modes ◽  
Cavity Cooling

Construction of three RF stations in the storage ring of SPring-8 has been completed. The design concept concentrates on avoiding a coupled-bunch instability which limits the stored current or makes the synchrotron radiation beam unstable. The cavity is bell-shaped to reduce the coupling impedance of the higher-order modes. The cavity dimensions are trimmed systematically to distribute the higher-order mode frequencies. Each cavity has two movable tuners. The temperature of the cavity cooling water is controlled within 0.02 K and the water flow is kept constant. The construction and commissioning of the SPring-8 storage ring RF system is reported.

Macromolecular crystallography with synchrotron radiation. II. Results

1983 ◽  
Vol 16 (1) ◽  
pp. 28-41 ◽  
Author(s):  
K. S. Wilson ◽  
E. A. Stura ◽  
D. L. Wild ◽  
R. J. Todd ◽  
D. I. Stuart ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Data Collection ◽  
Data Processing ◽  
Storage Ring ◽  
Glycogen Phosphorylase ◽  
Troponin C ◽  
Synchrotron Radiation Beam ◽  
Macromolecular Crystallography ◽  
Radiation Beam ◽  
Thermal Diffuse

Crystallographic data for three different protein crystals (glycogen phosphorylase b to 2 Å resolution, β-lactamase I to 2.5 Å resolution and troponin C to 6 Å resolution) have been recorded using the intense synchrotron radiation beam emitted by the DCI storage ring at LURE and the DORIS storage ring at DESY/EMBL. Reduction in exposure times of approximately 50-fold and an increase in crystal lifetime of at least fivefold are observed when data recorded at LURE are compared with those recorded with a conventional rotating-anode source. These factors have made possible data collection which otherwise would have been impossible. For large crystals of phosphorylase b a greater reduction in exposure time ( × 125) is made possible by the focusing geometry of the synchrotron-monochromator system which allowed irradiation of a larger volume of the crystal (collimator size increased from 0.3 to 1.0 mm) without significant increase in spot overlap on the film. The data processing statistics for phosphorylase b and β-lactamase compare favourably with those from data recorded on a conventional source (improvements in merging R values of between 1 and 4%). For phosphorylase b, but not for β-lactamase or troponin C, significant thermal diffuse scatter is observed on photographs recorded with synchrotron radiation. The possible origin of this phenomenon and its effect on data processing are discussed.

Installation of new damped cavities at the Photon Factory storage ring

1998 ◽  
Vol 5 (3) ◽  
pp. 369-371 ◽  
Author(s):  
Masaaki Izawa ◽  
Tadashi Koseki ◽  
Shyogo Sakanaka ◽  
Takeshi Takahashi ◽  
Klaus Hass ◽  
...  
Keyword(s):  
Single Cell ◽  
Storage Ring ◽  
High Power ◽  
Simple Structure ◽  
Power Input ◽  
Higher Order ◽  
Microwave Absorber ◽  
Photon Factory ◽  
Higher Order Modes ◽  
Cell Cavity

New damped cavities have been installed in the Photon Factory (PF) storage ring and successfully operated in the last scheduled user run of 1996. The new damped cavity is a simple single-cell cavity with somewhat large beam-duct holes. The part of the beam duct that is attached to the cavity is made of SiC, which works as a microwave absorber and damps the higher-order modes excited in the cavity. Because of its simple structure, the operation of the cavity is very stable and also a high power input of more than 150 kW is possible. No coupled-bunch instabilities due to the new cavity were observed during operation.

The Mixed Method Analysis of Higher Order Mode in Waveguide of Piecewise Homogeneous Dielectric

2011 ◽  
Vol 130-134 ◽  
pp. 3334-3337
Author(s):  
Chun Jiang Shuai
Keyword(s):  
Mixed Method ◽  
Higher Order ◽  
Order Mode ◽  
Tem Cell ◽  
Higher Order Modes ◽  
Calculation Results ◽  
Elementary Principle ◽  
Method Analysis ◽  
General Computer Program ◽  
Higher Order Mode

This paper presented the elementary principle and the computation for waveguide eigenvalues by using mixed method (Quadric-FE-BEM). A general computer program based on the mixed method is programed, as an application, the cut–off wavelength of higher order modes in the rectangular waveguide are computed and the calculation results are well in agreement with the theoretical value. It has been shown that the mixed method is an effective method to analyze waveguide eigenvalues in engineering. At last, the cut-off wavelength of higher order modes in TEM Cell of homogeneous dielectric is also analyzed.

Upgrading of the synchrotron radiation beam stabilization system of the VEPP-3 storage ring

2015 ◽  
Vol 51 (1) ◽  
pp. 39-44 ◽  
Author(s):  
M. G. Fedotov ◽  
A. N. Aleshaev ◽  
S. I. Mishnev ◽  
A. F. Rovenskikh ◽  
A. N. Selivanov ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Storage Ring ◽  
Synchrotron Radiation Beam ◽  
Stabilization System ◽  
Radiation Beam

The belok station for protein crystallography on the synchrotron radiation beam from the bending magnet in the Sibir-2 storage ring

2007 ◽  
Vol 52 (2) ◽  
pp. 358-364 ◽  
Author(s):  
D. M. Kheiker ◽  
M. V. Kovalchuk ◽  
Yu. N. Shilin ◽  
V. A. Shishkov ◽  
S. N. Sulyanov ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Storage Ring ◽  
Protein Crystallography ◽  
Synchrotron Radiation Beam ◽  
Radiation Beam

Higher Order Modes as Accuracy Limiting Factor in Permittivity Measurements of High Lossy Fluids Using Transmission Techniques in the GHz Range

1989 ◽  
Vol 44 (1) ◽  
pp. 75-80 ◽  
Author(s):  
A. Redhardt ◽  
H.-J. Steinhoff ◽  
J. Schütter ◽  
H.-J. Neumann ◽  
G. Hess
Keyword(s):  
Higher Order ◽  
Dielectric Constants ◽  
Limiting Factor ◽  
Order Mode ◽  
High Permittivity ◽  
Simulation Procedure ◽  
Higher Order Modes ◽  
Permittivity Measurements ◽  
Higher Order Mode

Abstract The higher order mode distortion in measuring dielectric constants on high lossy, high permittivity liquids in the GHz range is investigated by a simulation procedure as well as by experiment. For this, a homodyne method for measuring ε* is introduced in analogy to precision EPR-work.

Sign in / Sign up

Export Citation Format

Share Document