ANKA, a synchrotron light source for microstructure fabrication and analysis

Fabrication of microstructures by X-ray deep lithography (XRDL), galvanoforming, and plastic molding (German acronym LIGA) has made its way from Forschungszentrum Karlsruhe to many labs throughout the world. The acronym ANKA stems from Angstrom and Karlsruhe to indicate the main spectral range and the location. ANKA is designed to satisfy the needs of XRDL as well as of X-ray analysis, in particular, of microstructures. Industrial demand of service in both fields will play a major role for ANKA. The main design parameters of the storage ring are an electron energy of 2.5 GeV, magnetic field of 1.5 T, and an ensuing characteristic wavelength of 0.2 nm. The lattice has fourfold symmetry with four dispersion-free straight sections, each about 4 m long. The optics is a double DBA structure with four 22.50 bending magnets per cell resulting in a compact medium-emittance design with a circumference of 97.2 m and an emittance in the range of 40 to 80 nmrad. Four 500 MHz RF cavities are placed one in the middle of each cell. In this way, only one straight section is needed for injection leaving three for optional insertion devices. Electron current will be 200 mA in a first phase. Lifetime will exceed 17 h. Dynamic aperture is large enough to insert wigglers and wavelength shifters and to double the current when upgrading the RF system. 14 out of 32 available bending magnet radiation ports will be equipped with beamlines in the first phase.