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G. 9 keV X-rays, produced in the β-decay of 55 Fe, interact via photo-effect with the detector gas (Sect. 2). 56 eV=222 e = q0 . Considering the electron mesh transparency t (E drift ), the charge-to-voltage conversion factor of the preamplifier cq→U and a detector capacitance dependent factor ccap (see Bortfeldt 2010, Chap. 8 for a discussion), the pressure and temperature dependent gas gain G(E amp , T, p) can be calculated from the measured pulse height ph(E amp , E drift , T, p) from G(E amp , T, p) = ph(E amp , E drift , T, p) .

The ion drift velocity can only feebly be adjusted by the amplification field, since the desired gas gain defines the amplification field. The ion drift is furthermore rather insensitive to gas admixtures. In order to considerably increase the ion drift velocity, completely different gas constituents have to be used. 2, the use of lighter noble gases such as neon or helium allows for a considerable reduction of the signal length. 6 Mesh Transparency Electrons from ionization processes in the drift region move in the homogeneous field between cathode and mesh towards the mesh.

In: LHC Technical proposal CERN-LHCC98-004, CERN. ch/record/622031 LHCf Collaboration (2006) LHCf experiment: technical design report. In: Technical design report CERN-LHCC-2006-004, CERN, Geneva. ch/record/926196 MoEDAL Collaboration (2009) Technical design report of the MoEDAL experiment. In: Technical design report CERN-LHCC-2009-006, CERN, Geneva. ch/record/1181486 Ondreka D, Weinrich U (2008) The Heidelberg ion therapy (HIT) accelerator coming into operation. In: Proceedings of the EPAC08, Genoa, Italy, 2008 Pancin J et al (2004) Measurement of the n_TOF beam profile with a micromegas detector.

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