Measurement of the Neutrino Beam Quality with the Muon Monitor "MUMON" in the T2K Experiment

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Aithousa Mitropoulos ()

Aithousa Mitropoulos

Megaron, Athens - Greece


Kento Suzuki (Kyoto University)


T2K ( Tokai-To-Kamioka ) is a long baseline neutrino oscillation experiment which uses the 30GeV proton beam produced at J-PARC ( Japan Proton Accelerator Research Complex ). The proton beam is injected onto a graphite target to generate charged pions, which are focused by three electromagnetic horns. Neutrinos are produced with muons from the pion decay. We aim the neutrino beam onto an off-axis by 2.5 degrees from the direction to the Super-Kamiokande detector to maximize the sensitivity to the oscillation measurement. The beam direction has to be measured within a 1mrad precision in order to achieve The T2K physics goal. The muon monitor "MUMON" is located 118m away from the target and consists of two arrays of detectors, ionization chambers and silicon PIN photodiodes. It monitors the direction of the neutrino beam in real time by measuring the profile of muons which are generated along with neutrinos. In the 2009 commissioning run, we confirmed that the beam direction can be determined with a precision much better than 1mrad with MUMON. In addition, MUMON showed high sensitivity for the proton beam intensity and the position at the target and also for the current of the electromagnetic horns. We will report on the performance of MUMON and the neutrino beam quality measured in the physics data taking in 2010.

Primary author

Kento Suzuki (Kyoto University)


Akira Murakami (Kyoto University) Atsuko K. Ichikawa (Kyoto University) Hajime Kubo (Kyoto University) Kodai Matsuoka (Kyoto University) Masashi Yokoyama (University of Tokyo) Takasumi Maruyama (High Energy Accelerator Research Organization) Tsuyoshi Nakaya (Kyoto University)

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