Development for an optimization algorithm for beam profile measurement using multiple 16-electrode BPMs

In the T2K experiment, we are searching for the CP violation by a precise measurement of neutrino oscillations, and aiming to improve the measurement accuracy. In order to improve the accuracy, it is necessary to increase the output power of the neutrino beamline, and therefore the beam power of J-PARC's Main Ring (MR) is being upgraded. The upgraded beam power increases beam intensity-dependent instability, which leads to beam loss and makes stable beamline operation difficult. Further understandings of beam dynamics are required for a stable acceleration of the high-intensity beams. A new beam monitor called a 16-electrode beam monitor (16 Pick-Up Monitor, 16 PU monitor) has been developed to non-destructively measure the profile of high-intensity beams, which is important information for further understanding. Currently, the 16PU monitors are installed in two locations on the MR. In the previous research, the transverse RMS emittance of the beam was measured from the high-order moment component of the beam using the two 16PU monitors. Currently, the theme is a beam profile measurement, and we are investigating and simulating how precisely beam profile can be measured using multiple measurement points. In this talk, We will report the search results of an optimization algorithm that estimates the lateral shape of the beam from the 16 PU monitor data. (author)