Abstract
An introduction to Micromegas has already been given in Sect. 1.1. In the following chapter the functional principle as well as the main features of Micromegas detectors are discussed in detail. Readers interested in the internal setup of Micromegas detectors are referred to Sect. 2.1. The physics of ionization, drift and gas amplification processes are discussed in Sects. 2.2–2.4. In Sect. 2.5 the signal formation in Micromegas is described. Effects related to the transparency of the micro-mesh for electrons are discussed in Sect. 2.6. The streamer mechanism, that leads to the formation of discharges in Micromegas, is shortly described in Sect. 2.7.
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Notes
- 1.
E.g. 400 lines per inch, wire diameter 18 µm, wire periodicity 63.5 µm.
- 2.
\(r_e\): classical electron radius, \(m_e\): electron mass, \(\rho \): density of the target material, \(N_A\): Avogadro constant, Z: atomic number and A: atomic mass in g/mol of target material, z: charge of incident particle, \(\beta = v/c\): velocity of incident particle, \(\gamma =1/\sqrt{1-\beta ^2}\): Lorentz factor, \(T_\text {max} \approx 2m_e c^2 \beta ^2\gamma ^2\): maximum kinetic energy transferable to an electron in an elastic collision, I: mean excitation energy.
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Bortfeldt, J. (2015). Functional Principle of Micromegas. In: The Floating Strip Micromegas Detector. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-18893-5_2
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