Accelerator Design!

    New 2m straight section is inserted to the the center of arc section. This new straight section is for Soft Xray Minipole undulators. In addition, the length of the bending magnets is longer than the old plan, for users want to operate accelerator at the energy 1.6 GeV for soft Xray. (But, because of Quadrupole magnet's strength limit, Low emittance mode is not available at the energy 1.6GeV.)
    2m straight section is inserted by the same concept as main long straight section that straight sections are made to be transparent  for nonlinear componemts (sextupoles). It is done by designing the tune advance at the straight section to be multiple of 1.0 (horizontal)  or 0.5 (vertical).
    (((For the details, see design concepts page, but not translated yet, and I write a little bit here.))). In reality, helf of the normal cell is included in the matching section to make dispersion function zero at the straight section. But matching section is really different from nornal normal cells from the end of sextupoles. i.e. from arc section to the last sextupole end, periodic structure is fully achieved. And so, we tune the tune advance of matching section and long straight section (including half slightly changed normal cell *2 (right and left) and long straight section) to one nornal cell tune + transparent tune (1.0 or 0.5). For ideal momentum and little amplitude particles, sextupole nonlinear forces are really fully 24 symmetric (transparent).

Design Concepts (J)
The effect of the Chromaticity Correction and its correction (J)
Emittance Growth by Current (Intra Beam Scattering) (J)
Ratio of Alignment Error to the COD (J)
The Effect of the Errors and Correction (J)
Dynamic Aperture of 24 symmetroc Ring (Low emittance mode) (J)
 

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KEK (High Energy Acceralator Research Organization)