N. Kawasaki

Development of a Neutral Beam Profile Monitor

We developed a novel beam profile monitor for measuring the shape of an intense neutral beam for particle physics. This monitor is based on a detector technology of scintillating fibers, photomultiplier tubes, and sampling ADCs. It has an advantage for its simplicity, reliability, flexibility, and versatility. This monitor was installed in the small-diameter neutral beam for the KL0 →π0 νν experiment at J-PARC. We report in this article the development and performance of this monitor.

Development of a low-mass and high-efficiency charged-particle detector

We developed a low-mass and high-efficiency charged particle detector for an experimental study of the rare decay

Long-lived neutral-kaon flux measurement for the KOTO experiment

K_L \rightarrow \pi^0 \nu \bar{\nu}

An aerogel Cherenkov detector for multi-GeV photon detection with low sensitivity to neutrons

. The detector is important to suppress the background with charged particles to the level below the signal branching ratio predicted by the Standard Model (O(10

Two-Dimensional Measurement of Rotational Speed of a Diffuse Object Based on Laser Doppler Anemometry.

^{-11}

Evaluation of the Inefficiency of a Charged Particle Detector for the KOTO Experiment

)). The detector consists of two layers of 3-mm-thick plastic scintillators with wavelength shifting fibers embedded and Multi Pixel Photon Counters for readout. We manufactured the counter and evaluated the performance such as light yield, timing resolution, and efficiency. With this design, we achieved the inefficiency per layer against penetrating charged particles to be less than

Halo Neutron Measurement for KOTO Experiment

1.5 \times 10^{-5}

Gas Wire Chamber for In-Beam Charged Particle Detector in KOTO Experiment

, which satisfies the requirement of the KOTO experiment determined from simulation studies.

Development of Amplifier and Shaper for High-Rate MWPC

The KOTO (

Measurement of K L 0 flux at the J-PARC neutral-kaon beam line

K^0