Speaker
Description
The Feschenko-type bunch shape monitor (BSM) is often utilized to measure the longitudinal bunch profile in the hadron linac. In the Japan Proton Accelerator Research Complex (J-PARC) linac, several BSMs are installed to measure the negative hydrogen (H-) ion beam with a peak current of 50 mA, supplied for the high-intensity user operation. As for the notable features of the J-PARC BSM, the 3-MeV H- ion beam in the linac front-end can be measured with the dedicated BSM using the graphite target probe. Thanks to this dedicated BSM, the longitudinal profile can be measured in the low-energy region, where the space-charge force is strongly affected to the H- ion beam. A series of longitudinal profiles was measured with scanning the probe position of the BSM in the horizontal direction, which is the test usage to obtain the two-dimensional profile in the horizontal-longitudinal plain. This 2d profile is expected to contain the interesting information about the correlation of the beam spatial distribution by the space-charge force of the high-intensity H- ion beam. Despite a challenging approach, beam parameters such as the Twiss parameters and the emittance tried to be extracted from a set of 2d profiles under the single quadrupole scan by the machine learning. The convolutional neural network is used to estimate beam parameters of the x, y, and z direction from a series of 2d profiles in the horizontal quadrupole scan. The preliminary result will be reported.
Footnotes
- R. Kitamura et al., “Measurement of the longitudinal bunch-shape distribution for a high-intensity negative hydrogen ion beam in the low-energy region”, Phys. Rev. Accel. Beams, 26, 032802 (2023).
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