Experimental Nuclear and Particle Physics

Accelerator Science


Guest Professor : Michikazu Kinsho
Visiting Professor : Kazuhiro Tanaka Junji Haba


Our group carries out research of nuclear and particle physics with high-intensity proton accelerator and other accelerators.

Study of high-intensity proton accelerator (Michikazu Kinsho)

Fig1: Japan Proton Accelerator Research Complex J-PARC (Tokai)

 High intensity proton accelerator complex (J-PARC) is a newly constructed facility to deliver world’s strongest proton beam at Japan Atomic Energy Agency (Tokai, Ibaraki). By using the high intensity proton beam, world-leading researches on nuclear, particle, material and life sciences will be performed. J-PARC consists of three stage accelerators: Linac, rapid-cycle 3-GeV synchrotron (RCS) and 50-GeV synchrotron (MR). Starting from Linac beam test in January 2007, beam acceleration and extraction at MR was successfully performed by May 2008. Beam started to be delivered at neutron/muon facilities (material and life science facility MLF) from December 2008. Furthermore, K meson production (February) and neutrino production (April) were successfully confirmed in 2009. Now we are proceeding research both from hardware and software on technical issues about accelerator components like magnets, RF cavities, understanding of beam instability to achieve the final goal of beam intensity (RCS: 1MW, MR 0.75MW).

Study of hadron physics with high-intensity proton accelerator (Kazuhiro Tanaka)

Beam from the 50-GeV proton synchrotron was successfully introduced for the first time into the J-PARC hadron facility (Fig.2) on 27th January, 2009. On 10th February, primary target was inserted into the proton beamline and the second particles like pions and kaons were successfully transported to the experimental area. At the first stage of commissioning of the J-PARC hadron facility, study of hypernuclei and rare-decay of kaons will be performed. We, the hadron science group, will drive research of particle and nuclear physics through construction of the basic hardware like beamlines and spectrometers.

Fig 2: Secondary beam analyzer (green) and super-conducting kaon spectrometer SKS (yellow) installed at the Hadron facility, J-PARC.
They were constructed for high-resolution experiment with pi, K mesons and anti-protons up to 2 GeV/c.

Research and development of particle and nuclear experimental systems for the accelerator facility (Junji Haba)

Fig 3: Silicon micro-strip detector which adopts LSI techniques.
It can detect the track of charged particles with an accuracy of micrometers.

Particle/nuclear experiments are trying to reproduce the event or physics reactions, which may happen at the moment of creation of the Universe. In order to do such a research, state-of-art detectors as well as high-performance particle accelerator are essential and innovation of detector/accelerator technique opens a door to new physics. We are developing new detector techniques which explore new possibilities of particle/nuclear physics. Such techniques will play important roles not only in particle/nuclear physics, but also in material/life science. They can be used for diagnosing of diseases and non-destructive analysis of material for industry.

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