12–17 Oct 2015
Trieste - Italy
Europe/Rome timezone

Report on mass production of large size bulk Micromegas boards at ELVIA company

13 Oct 2015, 16:45
Oceania (Trieste - Italy)

Oceania

Trieste - Italy

Congress Centre Stazione Marittima Molo Bersaglieri, 3 34123 Trieste Italy
Board: 69
Poster Production techniques Poster session & coffee break

Speaker

Dr Damien Neyret (CEA Saclay IRFU/SPhN)

Description

The CEA Saclay/IRFU COMPASS group built a dozen of new Micromegas pixelized detectors in 2014-2015 for the new hybrid detector based tracking system (see the corresponding abstract). These Micromegas detectors were based on bulk boards produced by the ELVIA company at Coutances (France). The boards are large, 80x60 cm² with an active area of 40x40 cm², and require a very precise etching of the PCB, with 60µm thick strips and 60µm insulation, due to the pixelized area at the center of the detector. The 200µm thin PCB is stiffened by being glued on a Rohacell sandwich, then a stainless steel micromesh is bulked on the board. A collaboration between the CEA Saclay/IRFU and the CIREA company, PCB producer member of the ELVIA group, was initiated in 2010-2011 in order to transfer the bulk Micromegas technology to this company. After a learning phase which lasts several months, this company is able to produce large size bulk boards. Several prototypes of different types were produced by CIREA and ELVIA for the COMPASS experiment. Part of them were installed and tested in real condition in the COMPASS spectrometer in 2012 and 2014. The prototypes were also tested in laboratory with source and cosmic rays in order to determine their performances (in particular gain, efficiency, spatial and time resolution). Finally the mass production started in Fall 2014 and was completed in June 2015. The new hybrid pixelized detectors are presently routinely used for COMPASS data taking. After a short introduction on the new pixelized Micromegas detectors for COMPASS, and the main difficulties of the board production, the proposed poster will show the progresses ELVIA made on the quality of the production, from the first prototypes to the last built boards.

Primary author

Dr Damien Neyret (CEA Saclay IRFU/SPhN)

Presentation materials

There are no materials yet.