Abstract
We present the development of resistive Micromegas aiming at operation under high rates, up to tens MHz/cm2, focusing on the optimisation of the spark protection resistive layer and the miniaturisation of the readout elements. Several Micromegas detectors have been built with an anode plane matrix of 48x16 rectangular readout pads, each pad 0.8x2.8 mm2. The detectors differ for the spark protection resistive schemes being realised with the following techniques: a pad-patterned embedded resistor by screen printing, and uniform DLC (Diamond Like Carbon structure) layers.Characterisation and performance studies of the detectors have been carried out by means of radioactive sources, X-Rays, and test beam. A comparison of the performance obtained with the different resistive layouts is presented, in particular focusing on the response under high irradiation and high rate exposure.
Highlights
Resistive Micromegas are built with parallel plate electrodes structure, with the volume divided into two gaps by means of a metallic mesh
While a drop of about 20% is observed in the patterned screen printed resistive layer (PAD-P) detector, after few seconds after the start of irradiation, the Diamond Like Carbon structures (DLC) detectors do not show any charging up effect
An indication of a dependency on the irradiated surface can be seen for DLC50–6mm in Fig. 7 in the comparison of exposures on 0.07 cm2, 0.79 cm2 and 3.61 cm2
Summary
Resistive Micromegas are built with parallel plate electrodes structure, with the volume divided into two gaps (drift and amplification) by means of a metallic mesh. For high rates applications and/or intense flux of highly ionising particles, discharges effects are greatly mitigated with the implementation of a layer of resistive strips facing the amplification gap [1]. This is, for example, the solution adopted by ATLAS for the New Small Wheel upgrade, for operations up to few kHz/cm2 [2].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
