total number of wires acting in the wire frame; this therefore has to be of substancial is the use of delicate wires and the wire stretching force, which is proportional to the and it operates in a stable fashion for long irradiation periods. The drawback here spatial resolution. In addition it can achieve higher electron multiplication factors performance of this structure equals that of the MSGC in terms of rate capability and to the cathode plane with engraved pick-up strips orthogonal to the wire direction. The multiwire structure [7,8] with alternating anodes and field-shaping wires, mounted close Another possible way out is the use of a special asymmetric configuration of the and spatial resolution.resolve the charging~up problem and giving superior results in terms of rate capability this class of gas detectors, the micro-gap chamber [6], was recently developed aiming to the resistivity of the substrate or a special treatment of its surface. Another type in during the last few years, to resolve the charging-up problem by a careful choice of of the gain in the irradiated area of the detector [5]. A lot of effort has been invested, and accumulated on the insulator, locally modify the electric field and cause a drop breakdown on the insulator surface. Positive ions created during the avalanche process detector is the fact that the avalanche multiplication does not exceed 104, because of offers the possibility to cope with higher counting rates. One limitation of the MSGC allows a good spatial resolution, inferior to 100 ps and the fast collection of the charges of gas detector relying on the microelectronics technology. The small inter-strip pitch tion, is created between the thin cathode and anode conductive strips. It is a new class on an insulating support; a high electric field region, sufhcient for electron multiplica has been developed over the last eight years [2,3, 4]. Wires are replaced by strips printed To overcome these limitations, a new technique, the microstrip gas chamber (MSGC), of 1 mm.onds. Their spatial resolution was limited by the wire spacing, which was of the order cause of the low ion drift velocity with a typical drift time of several tenths of microsec Their flux capability was mainly limited by the positive-ion space charge created be Multiwire proportional chambers have been originally designed for high-rate applicati0ns [1].

In this paper, we present a novel way to manufacture the bulk Micromegas detector. A simple process based on the Printed Circuit Board (PCB) technology is employed to produce the entire sensitive detector. Such a fabrication process could be extended to very large area detectors made by the industry. The low cost fabrication together with the robustness of the electrode materials will make it attractive for several applications ranging from particle physics and astrophysics to medicine. r

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