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Performance of Multiplexed XY Resistive Micromegas detectors in a high intensity beam
Journal
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Date Issued
2018-02-11
Author(s)
Banerjee, D.
Burtsev, V.
Chumakov, A.
Cooke, D.
Depero, E.
Dermenev, A. V.
Donskov, S. V.
Dubinin, F.
Dusaev, R. R.
Emmenegger, S.
Fabich, A.
Frolov, V. N.
Gardikiotis, A.
Gninenko, S. N.
Hösgen, M.
Karneyeu, A. E.
Ketzer, B.
Kirsanov, M. M.
Konorov, I. V.
Kramarenko, V. A.
Levchenko, E.
Lysan, V.
Mamon, S.
Matveev, V. A.
Mikhailov, Yu V.
Myalkovskiy, V. V.
Peshekhonov, V. D.
Peshekhonov, D. V.
Polyakov, V. A.
Radics, B.
Rubbia, A.
Samoylenko, V. D.
Tikhomirov, V. O.
Tlisov, D. A.
Toropin, A. N.
Vasilishin, B.
Arenas, G. Vasquez
Ulloa, P.
Crivelli, P.
Abstract
We present the performance of multiplexed XY resistive Micromegas detectors tested in the CERN SPS 100 GeV/c
electron beam at intensities up to 3.3 × 105
e
−∕(s ⋅ cm2
). So far, all studies with multiplexed Micromegas have
only been reported for tests with radioactive sources and cosmic rays. The use of multiplexed modules in high
intensity environments was not explored due to the effect of ambiguities in the reconstruction of the hit point
caused by the multiplexing feature. For the specific mapping and beam intensities analyzed in this work with
a multiplexing factor of five, more than 50% level of ambiguity is introduced due to particle pile-up as well as
fake clusters due to the mapping feature. Our results prove that by using the additional information of cluster
size and integrated charge from the signal clusters induced on the XY strips, the ambiguities can be reduced to a
level below 2%. The tested detectors are used in the CERN NA64 experiment for tracking the incoming particles
bending in a magnetic field in order to reconstruct their momentum. The average hit detection efficiency of each
module was found to be ∼96% at the highest beam intensities. By using four modules a tracking resolution of
1.1% was obtained with ∼85% combined tracking efficiency.
electron beam at intensities up to 3.3 × 105
e
−∕(s ⋅ cm2
). So far, all studies with multiplexed Micromegas have
only been reported for tests with radioactive sources and cosmic rays. The use of multiplexed modules in high
intensity environments was not explored due to the effect of ambiguities in the reconstruction of the hit point
caused by the multiplexing feature. For the specific mapping and beam intensities analyzed in this work with
a multiplexing factor of five, more than 50% level of ambiguity is introduced due to particle pile-up as well as
fake clusters due to the mapping feature. Our results prove that by using the additional information of cluster
size and integrated charge from the signal clusters induced on the XY strips, the ambiguities can be reduced to a
level below 2%. The tested detectors are used in the CERN NA64 experiment for tracking the incoming particles
bending in a magnetic field in order to reconstruct their momentum. The average hit detection efficiency of each
module was found to be ∼96% at the highest beam intensities. By using four modules a tracking resolution of
1.1% was obtained with ∼85% combined tracking efficiency.
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