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At DESY the ALPS II experiment is being installed in the HERA tunnel tosearch for axion like particles (ALPs). A laser beam will be injected into astring of superconducting HERA dipole magnets, to produce ALPs. After passing alight tight wall, the ALPs can reconvert into photons in a second string ofHERA dipoles.The sensitivity of the experiment will be increased by twomode-matched optical cavities before and behind the wall. The curvature of themagnets limits the performance of the optical resonators, Therefore theaperture for the optical resonators inside the HERA dipoles was increased bystraightening the curved magnet yoke. The procedure of straightening the HERAdipoles is described in this report.

Straightening of Superconducting HERA Dipoles for the Any-Light-Particle-Search Experiment ALPS II