1. Mission
2. Overview
3. Main Activities
4. Publication List

1. Mission    

The mission is to achieve reliable and stable beam operation of the SPring-8 accelerator complex and to improve the light source performance.

2. Overview

To this end we build and develop various monitoring systems and software required for reliable and stable operation. We also manage and analyze operational data to feedback the experience of operational failures to the future operation. We investigate new operation scheme and develop a necessary system to improve light source performance.

In order to realize the stable operation, monitoring the various conditions of the light source and documentation of specific operation results are our tasks. For this purpose we develop and maintain upper level application software.  As the upgrade of the operation of the light source, we construct a system acquiring the new additional information.  The operator personnel are responsible for all day-to-day machine operations, ensuring optimal machine performance for the SPring-8 accelerator complex as well as providing reliable, stable beam for user operations.

We also develop and maintain beam control programs and Graphic User Interfaces (GUIs) that are necessary for regular beam tuning and operation. We has been investigating new possibilities in lattice modification and operation scheme, etc. aiming at further performance improvement. To this end, we have been developing a precise ring model and various kinds of analysis codes based on single particle dynamics. In addition to such single particle dynamics analysis we pursue a high quality and a distinguished performance of the stored electron beam based on the detailed understanding of dynamical features of the beam. Influences of cumulative effects such as an excitation of oscillations due to a wake field are our special interest. To achieve the purpose, we develop beam controlling systems which suppress dynamical beam oscillations expected from instabilities and other reasons, especially at high impedance by narrow gaps of in-vacuum IDs, high stored current and high bunch current. We are responsible for operating and maintaining these systems. We are also working on beam diagnostics of the SPring-8 storage ring by utilizing synchrotron radiation. Beam diagnostics systems for beam profiles, and bunch purities have been developed at the accelerator diagnostics beamline I, which has a bending magnet light source. Construction of the accelerator diagnostics beamline II with an insertion device for light source is in progress.

<< Outline of Optical Diagnostic System>>

3. Main Activities

    The main subjects under investigation, a part of which has already completed, are listed below.

• Development, maintenance and improvement of :

  • upper level application software including GUIs for synchronized operation of SPring-8 accelerator complex

  • GUIs for beam tuning, i.e., optimization of injection beam orbit, ring optics adjustment, etc

  • application software for a periodic orbit correction

  • bunch-by-bunch feedback system for various beam filling patterns under low chromaticity

  • bunch current measurement system for top-up operation

  • feedforward correction system to suppress oscillation amplitude of stored beam induced by beam injection

  • beam diagnostic system:

  • bunch impurity measurement with photon-counting method

  • bunch length measurement with a streak camera

  • beam profile measurement

  • screen and OTR monitors for diagnostics of injection beam to the storage ring

  • Developments of insertion devices for beam diagnostics

• Investigations of applications of edge radiation of bending magnets to beam diagnostics

• R&Ds for precision beam diagnostics

• Study on :

  • dynamic aperture enlargement for a ring with four magnet-free straight sections of 30m

  • reduction of natural emittance by conventional and new approach

  • operation with high average- and high peak current

  • low energy operation ranging from 4GeV to 8GeV

  • HV oscillation coupling at large amplitude

  • stability improvement of lower-symmetric optics

  • minimizing injection bump leakage caused by sextupole magnets in the bump orbit

  • spatially coherent X-ray generation by utilizing extremely low vertical emittance (4D phase space manipulation)

• Analysis of magnetic error distribution along the storage ring by using beam response analysis

• Estimation and correction of linear optics distortion and development of various correction systems 

• Construction of necessary monitoring system for top-up operation (Contribution)

• Estimation of impedance of accelerator components

• Development of simulator for beam collective effects and 6D particle tracking and analysis code

• Precise modeling of IDs and correction of ID error fields

4. Publication List