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12-16 September 2005
University of Liverpool
Europe/Zurich timezone

Bulk-Micromegas detector technology

16 Sep 2005, 12:00
15m
University of Liverpool

University of Liverpool

Greenbank Conference Park
Contributed Talk Novel Gas-based Detection Techniques S15 : Novel Gas-based Detection Techniques

Speaker

Mr Stephane Aune (DAPNIA, Centre d' Etudes de Saclay, Gif sur Yvette Cedex 91191, France)

Description

A new technique of fabrication of Micromegas (MM) using the PCB technologies has been developed. A standard commercial wire mesh (19 m) was employed as cathode element and the amplification gap was defined by using spacers (pillars) made out of a 100 m thick Solder Mask (SM). After a three steps process, lamination, insulation and development, the detector core is obtained as a single-compact piece (Bulk Micromegas): In a first process the anode read-out, the SM and the mesh are laminated at high temperature (100°C). The polymerisation is done under UV insulation through a mask which provides the required shape (edges and pillars). Finally the non insulated part is removed by development in a chemical bath. The result is a self-sustained unit containing the PCB board and the mesh which is kept between two layers of SM : the outer border (2 mm wide) and the pillars ( 0.4 mm every 2 mm) in the inner region are left embracing the mesh. Several 10 cm x10 cm prototypes have been fabricated and successfully tested. High gas gains up to 105 have been reached in Argon mixtures and an energy resolution of 20% (FWHM) was measured, using x-rays from a 55Fe source. The advantage of this technique that allows large area detector fabrication is the robustness, the reliability and the low cost. The Bulk technology opens new perspectives: large MM mosaic detectors with negligible dead space, double stage MM, curved shape MM (i.e. cylinder of thin Kapton bulk)

Primary author

Mr Stephane Aune (DAPNIA, Centre d' Etudes de Saclay, Gif sur Yvette Cedex 91191, France)

Co-author

Ioannis Giomataris (DAPNIA, Centre d' Etudes de Saclay, Gif sur Yvette Cedex 91191, France)

Presentation materials