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Beam position measurement using linac microstructure at the KEK booster synchrotron

The position information of the most recently injected beam from the linac is obtained by picking-up the signal of the harmonic component of the beam, if the bunch structure disappears during one turn due to the momentum spread. The experiment for 201 MHz pickup was performed in the KEK booster ring, and is compared with the simulation. The possible application of this method to the 3 GeV rapid cycling synchrotron in the Japan Proton Accelerator Research Complex (J-PARC) is also addressed.