# VCI2022 - The 16th Vienna Conference on Instrumentation

Feb 21 – 25, 2022
Vienna University of Technology
Europe/Vienna timezone

## Encapsulated resistive anode bulk Micromegas detectors for the T2K experiment TPC upgrade

Not scheduled
20m
Vienna University of Technology

#### Vienna University of Technology

Gusshausstraße 27-29, 1040 Wien
Recorded Presentation Gaseous Detectors

### Speaker

Dr David Attie (CEA IRFU Centre d'etude de Saclay Gif-sur-Yvette (FR))

### Description

In order to establish accurate leptonic CP violation at 3 $\sigma$ level for a significant fraction of the possible $\delta_{CP}$ values, the T2K collaboration plan to upgrade the beam intensity and to upgrade the near detector ND280.

An innovative concept for this neutrino detection system made with a totally active Super-Fine-Grained-Detector (SuperFGD), two High Angle Time Projection Chamber (HA-TPC) and six time of flight planes.
The HA-TPC will be used for 3D track reconstruction, momentum measurement and particle identification. These TPCs, with overall dimensions of 2$\times$2$\times$0.8 m$^3$, will be equipped with 32 encapsulated resistive anode bulk Micromegas (ERAM) detectors. The thin field cage (3 cm thickness, 4\% radiation length) will consist of composite material with a Kapton foil with copper strips as inner layer. The 42$\times$34 cm$^2$ ERAM detector will use a 400 k$\Omega/\square$ diamond like carbon (DLC) foil to spread the charge over the pad plane, each pad being approximatively 1 cm$^2$. New front-end cards electronics, based on the AFTER chip, directly mounted on the back of the detector and parallel to its plane have been developed and used for the signal readout.

The first production ERAM detector modules have been tested in a lab using a X-ray bench and a cosmic bench. In July 2021, data have also been taken in a test beam at DESY in 0.2 T magnetic field. Performance characterization and results from these measurement campaign will be shown.

Primary experiment T2K

### Primary author

Dr David Attie (CEA IRFU Centre d'etude de Saclay Gif-sur-Yvette (FR))