24-28 February 2020
Budker Institute of Nuclear Physics
Asia/Novosibirsk timezone

Performances of a resistive MicroMegas module for the Time Projection Chambers of the T2K Near Detector upgrade

28 Feb 2020, 10:50
Contributed Oral Micropattern gas detectors Micropattern gas detectors


César Jesús-Valls (IFAE)


In view of the J-PARC program of upgrades of the beam intensity, the T2K collaboration is preparing towards an increase of the exposure aimed at establishing leptonic CP violation at 3 $\sigma$ level for a significant fraction of the possible $\delta_{CP}$ values. To reach this goal, an upgrade of the T2K near detector ND280 has been launched, with the aim of reducing the overall statistical and systematic uncertainties at the appropriate level of better than 4\%. We have developed an innovative concept for this neutrino detection system, comprising the totally active Super-Fine-Grained-Detector (SuperFGD), two High Angle TPC (HA-TPC) and six TOF planes. The HA-TPC will be used for 3D track reconstruction, momentum measurement and particle identification. These TPC, with overall dimensions of 2x2x0.8 m3, will be equipped with 32 resistive Micromegas. The thin field cage (3 cm thickness, 4% rad. length) will consist of composite material with a Kapton foil with copper strips as inner layer. The 34x42 cm2 resistive bulk Micromegas will use a 500 kOhm/square DLC foil to spread the charge over the pad plane, each pad being appr. 1 cm2. The front-end cards, based on the AFTER chip, will be mounted on the back of the Micromegas and parallel to its plane. The first resistive MicroMegas modules have been tested in a test beam at CERN and at DESY. Results of these test beams will be shown in this talk.

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