EPS HEP 2015

Construction of a Precision Four-Layer Floating Strip Micromegas Chamber

Not scheduled

20m

poster Detector R&D and Data Handling

Speaker

Jona Bortfeldt (Ludwig-Maximilians-Univ. Muenchen (DE))

Description

Floating strip Micromegas detectors have proven to be discharge sustaining and versatile high-rate capable tracking detectors. They exhibit a spatial resolution of 50 $\mu$m and a single strip temporal resolution on the order of 5 ns. Up to particle fluxes of 7 MHz/cm$^2$ single particle tracking at an efficiency above $95\%$ is possible. Recently we have further increased the high-rate capability by using alternative Neon based detector gases. We constructed a four-layer floating strip Micromegas detector with an active area of $55\times33$ cm$^2$ subdivided into 768 strips per layer. Each readout plane consists of two separate printed circuit boards. The anode and cathode panels are realized as stiff aluminum honeycomb sandwich panels with 0.5 mm thick copper-clad, structured FR4 boards. The panels are assembled on a precisely planar table, that carries a high-precision alignment frame. The assembly procedure shall ensure the relative alignment of the two readout boards per layer and the correct inter-plane alignment. The construction and assembly procedures of the quadruplet chamber are presented. They can serve as a proof-of-concept study for the construction of large-area multi-layer Micromegas chambers. Planarity measurements with a laser distance sensor equipped coordinate measuring machine and first measurements with the chamber are discussed.