Study of in nuclei through C spectrum at 1.8 GeV/ in the J-PARC E05 experiment

Honda, Ryotaro*; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Imai, Kenichi; Ichikawa, Yudai; Nanamura, Takuya; Naruki, Megumi; Sako, Hiroyuki; Sato, Susumu; et al.

JPS Conference Proceedings (Internet), 26, p.023014_1 - 023014_4, 2019/11

https://doi.org/10.7566/JPSCP.26.023014

A Beam position fiber counter with scintillation fibers and multi-pixel photon counter for high intensity beam operation

Honda, Ryotaro*; Miwa, Koji*; Matsumoto, Yuki*; Chiga, Nobuyuki*; Hasegawa, Shoichi; Imai, Kenichi

Nuclear Instruments and Methods in Physics Research A, 787, p.157 - 160, 2015/07

https://doi.org/10.1016/j.nima.2014.11.084

A beam position fiber counter consisting of the scintillation fiber and a multi-pixel photon counter was developed in order to handle a 10 MHz secondary pion beam in the J-PARC E40 experiment. This counter was installed at the entrance of the beam line spectrometer at the K1.8 experimental area in J-PARC and used for the momentum reconstruction. In order to suppress the accidental background and reconstruct the beam momentum, a good timing resolution better than 0.8 ns and a good position resolution better than 200 m were simultaneously required for the counter. These requirements were well achieved by reading the 320 fibers with a diameter of 1 mm, which were arranged in a staggered position, with MPPC fiber by fiber. The signal induced from each MPPC was handled with an Extended Analogue SiPM Integrated ReadOut Chip (EASIROC) developed by Omega/IN2P3 in France. In addition, the timing of the discriminated signals from EASIROC was measured by a FPGA-based multi-hit TDC implemented into Spartan-6. Finally, we obtained the timing resolution of 0.68 ns and the position resolution of 190 m under the 9 MHz beam condition using a pion beam.

Experimental investigation of baryon-baryon interaction through p scattering at J-PARC

Honda, Ryotaro; Imai, Kenichi

no journal, , 

It is natural to be consider that quark level interaction for nuclear force because that is based on strong interaction. Quark Pauli effect is expected as a candidate for origin of a strong repulsive core of nuclear force in a short range. p scattering is a good probe to approach quark Pauli effect. Several experiments were performed at KEK PS in past, however, the statistics was still poor. Hyperon-nucleon scattering is difficult experimentally due to the short life time of hyperons. In J-PARC E40, we determine a phase shift of of p scattering with 20% accuracy. New detectors, scintillation fiber trackers, are under development to obtain sufficient statistics. In this conference I will talk about physics in E40, a new experimental method, developments and status of a J-PARC accelerator.

The Development of the readout electronics for multi MPPC with EASIROC

Honda, Ryotaro; Imai, Kenichi

no journal, , 

In the J-PARC K1.8 beamline and J-PARC E40 experiment, we will use the fiber tracker consisting of scintillation fibers and multi pixel photon counter (MPPC). Each fiber of this detector is read by one MPPC. The total number of channels will be 5,000. We are developing a new readout electronics with EASIROC developed by Omega/IN2P3 in France for MPPC readout. As the first step of the development, we made an evaluation board with EASIROC and SiTCP. EASIROC and ADCs on the board are controlled by the FPGA. The FPGA communicates with DAQ system via netword by using SiTCP. All essential functions such as gain adjustment of MPPPC, A/D conversion and data transmit to DAQ system are included in this board. We did performance evaluation with this board. Signal to noise ratio for analogue input is 6. Inclusive timing jitter is 150 ps (). Data transmit speed is 14 kHz. These performance are sufficient for our experiment.