Fast beam-based alignment of BPMs and quadrupole magnets for SPring-8-II

In modern low-emittance electron storage rings, precise beam orbit control is crucial to ensure the beam passes through the magnetic center of each high-gradient multipole magnet, with an accuracy of 10 μm or even better. Accurate alignment of a BPM with the center of the neighboring magnet is imperative, a critical requirement for SPring-8-II. With a total of 340 BPMs, efficient beam commissioning of SPring-8-II necessitates a fast beam-based alignment (BBA) method. To assess the feasibility of this method, we conducted a fast BBA experiment at the current SPring-8 storage ring utilizing new BPM readout electronics based on MicroTCA.4, enabling a data acquisition rate at 10 kHz. We varied the strength of a quadrupole magnet adjacent to a BPM head connected to the new fast readout. We scanned the electron beam across the quadrupole center by adjusting a steering dipole magnet. The BPM offset from the quadrupole center was then determined by analyzing data from all BPMs connected to the fast readout. This contribution will detail the proposed fast BBA procedure for SPring-8-II and present the results obtained from the feasibility test at the existing SPring-8 storage ring.