T2K
J-PARC infrastructure
T2K (Tokai to Kamioka) is an experiment dedicated to the study of neutrino oscillations over a long distance using a µ-neutrino beam. The beam will originate from the J-PARC accelerator which is under construction in Tokai. The neutrino beam will be aimed at Super Kamiokande, a detector located 295km away in Kamioka. The construction of a near detector (280m) is required to determine beam properties before the oscillation (i.e. energy spectrum, background, flux) and to measure cross sections.
The main goal is to measure the θ13 angle of the neutrinos mixing matrix. This measurement is performed by searching for µ-neutrinos oscillating into e-neutrinos ("e-neutrinos appearance"). In the case of a non-zero value for θ13, experiments like Megatonne could study CP violation in the neutrinos system.
Data taking is scheduled to start in 2009. Dapnia contributionDapnia is contributing to:-the protection of the accelerator magnets (MagnetSafetySystem): T2K-MSS-the TPCs of the near detector: T2K-TPC
Scheme of the T2K Near Detector ND280 and Micromegas detector
DAPNIA is contributing to the front end electronics and to the "bulk" Micromegas detectors for the near detector TPCs.
The TPCs are immersed in a 0.2T magnetic field which will allow excellent spacial resolutions (on the order of 500m). This will allow the momentum of muons and electrons produced by neutrino interactions to be measured with an accuracy better than 10% up to 1GeV/c. Information from the TPCs will also be used for electrons and muons identification.
last update : 10-24 00:00:00-2007 (2262)
The ultimate constituents of matter 
Neutrinos
The Electronics, Detectors and Computing Division The Particle Physics Division Accelerators, Cryogenics and Magnetism Department (SACM) The Systems Engineering Division
 |
14-09-2009
Engineers and physicists from IRFU have successfully assembled and commissioned three large chambers designed to reconstruct charged particle tracks. The chambers will characterize the neutrino beam used in the T2K (Tokai to Kamiokande) experiment. They are the first large Time Projection Chambers (TPCs) to be equipped with micromesh gas detectors (Micromegas). The chambers have a very large sensitive area (nearly 9m²) and a correspondingly high number of electronic channels (124,000). IRFU built the entire detection system of the three TPCs, comprising 72 Micromegas detectors and all the front-end electronics. Engineers from SEDI, a department specialised in ... More » |
