The universal sampling ADC readout system of the COMPASS experiment

Mann, A.; Konorov, I.; Angerer, H.; Krämer, M.; Huber, S.; Grube, B.; Jm, Friedrich; Ketzer, B.; Uhl, S.; Haas, Florian; Dinkelbach, A.M.; Grabmüller, S.; Paul, S.

doi:10.1109/nssmic.2009.5402077

Cited by 9 publications

(5 citation statements)

References 12 publications

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“…By requiring the presence of in-time SR signal in all three SRD counters, and using information of the longitudinal and lateral shower development in the ECAL, the initial level of the hadron contamination in the beam π/e − 10 −2 was further suppressed by more than 4 orders of magnitudes, while keeping the electron ID efficiency at the level 95% [58]. The ECAL PMTs were read-out with sampling ADC (MSADC) electronics which consist of shapers and the ADCs themselves [59,60]. The shaper stretched the PMT signal to 100 ns while the MSADC sampled the signal amplitude every 12.5 ns.…”

Section: H4 Beam and Na64 Detectormentioning

confidence: 99%

Search for vector mediator of dark matter production in invisible decay mode

Banerjee¹,

Burtsev²,

Chumakov³

et al. 2018

Phys. Rev. D

145

126

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A search is performed for a new sub-GeV vector boson (A ) mediated production of Dark Matter (χ) in the fixed-target experiment, NA64, at the CERN SPS. The A , called dark photon, can be generated in the reaction e − Z → e − ZA of 100 GeV electrons dumped against an active target followed by its prompt invisible decay A → χχ. The experimental signature of this process would be an event with an isolated electron and large missing energy in the detector. From the analysis of the data sample collected in 2016 corresponding to 4.3 × 10 10 electrons on target no evidence of such a process has been found. New stringent constraints on the A mixing strength with photons, 10 −5 10 −2 , for the A mass range m A 1 GeV are derived. For models considering scalar and fermionic thermal Dark Matter interacting with the visible sector through the vector portal the 90% C.L. limits 10 −11 y 10 −6 on the dark-matter parameter y = 2 αD( mχ m A ) 4 are obtained for the dark coupling constant αD = 0.5 and dark-matter masses 0.001 mχ 0.5 GeV. The lower limits αD 10 −3 for pseudo-Dirac Dark Matter in the mass region mχ 0.05 GeV are more stringent than the corresponding bounds from beam dump experiments. The results are obtained by using exact tree level calculations of the A production cross-sections, which turn out to be significantly smaller compared to the one obtained in the Weizsäcker-Williams approximation for the mass region m A 0.1 GeV.

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Section: H4 Beam and Na64 Detectormentioning

confidence: 99%

Search for vector mediator of dark matter production in invisible decay mode

Banerjee¹,

Burtsev²,

Chumakov³

et al. 2018

Phys. Rev. D

145

126

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“…It exploits the flexibility of the FPGA (Field Programmable Gate Array) based sampling ADC modules used at the COMPASS experiment [3]. Programmable calibration constants and trigger parameters allow an easy fine-tuning the trigger system.…”

Section: Introductionmentioning

confidence: 99%

A Digital Trigger for the Electromagnetic Calorimeter at the COMPASS Experiment

Huber

Ketzer

et al. 2011

IEEE Trans. Nucl. Sci.

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At the COMPASS experiment at CERN's SPS many physics channels containing neutral particles are studied. These particles are identified by two electromagnetic calorimeters covering different regions of transverse momentum. For certain physics the main signature is described by these neutral particles requiring a calorimetric trigger system. The method described here is based on the existing front end electronics and uses digital pulse shape analysis techniques. With this approach a flexible trigger system was implemented. Because no new hardware had to be produced, the development costs were minimized. The implementation of the trigger as well as the performance, measured during the 2009 run will be discussed.

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“…The light produced in each fiber is detected by a Hamamatsu Photonics S13360-4935 silicon photomultiplier (SiPM) glued to one end of the fiber [25]. To digitize the SiPM signals, we use multichannel mezzanine-sampling analogto-digital converters (ADCs) [26].…”

Section: Methodsmentioning

confidence: 99%

Measurement of ionization quenching in plastic scintillators

Pöschl,

Greenwald,

Losekamm

et al. 2020

Preprint

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Plastic scintillators are widely used in high-energy and medical physics, often for measuring the energy of ionizing radiation. Their main disadvantage is their non-linear response to highly ionizing radiation, called ionization quenching. This nonlinearity must be modeled and corrected for in applications where an accurate energy measurement is required. We present a new experimental technique to granularly measure the dependence of quenching on energy-deposition density. Based on this method, we determine the parameters for four commonly used quenching models for two commonly used plastic scintillators using protons with energies of 30 MeV to 100 MeV; and compare the models using a Bayesian approach. We also report the first model-independent measurement of the dependence of ionization quenching on energy-deposition density, providing a purely empirical view into quenching.

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The universal sampling ADC readout system of the COMPASS experiment

Cited by 9 publications

References 12 publications

Search for vector mediator of dark matter production in invisible decay mode

Search for vector mediator of dark matter production in invisible decay mode

A Digital Trigger for the Electromagnetic Calorimeter at the COMPASS Experiment

Measurement of ionization quenching in plastic scintillators

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