A Digital Trigger for the Electromagnetic Calorimeter at the COMPASS Experiment

Huber, S.; Jm, Friedrich; Ketzer, B.; Konorov, I.; Krämer, M.; Mann, A.; Nagel, T.; Paul, S.

doi:10.1109/tns.2011.2152854

Cited by 6 publications

(2 citation statements)

References 6 publications

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“…All the crystals were tested using cosmic radiation and their decay time was measured to be about 300 ns in good agreement with the value quoted in the literature [13]. The BGO's signals are digitized by the MSADC system [14] which is connected to the DAQ of the experiment. The DAQ is downscaled version of COMPASS iFDAQ system [15].…”

Section: Methodssupporting

confidence: 63%

High purity 100 GeV electron identification with synchrotron radiation

Depero

Banerjee

Burtsev

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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In high energy experiments such as active beam dump searches for rare decays and missing energy events, the beam purity is a crucial parameter. In this paper we present a technique to reject heavy charged particle contamination in the 100 GeV electron beam of the H4 beam line at CERN SPS. The method is based on the detection with BGO scintillators of the synchrotron radiation emitted by the electrons passing through a bending dipole magnet. A 100 GeV $\pi^-$ beam is used to test the method in the NA64 experiment resulting in a suppression factor of $10^{-5}$ while the efficiency for electron detection is $\sim$95%. The spectra and the rejection factors are in very good agreement with the Monte Carlo simulation. The reported suppression factors are significantly better than previously achieved.Comment: 10 pages, 6 figure

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Section: Methodssupporting

confidence: 63%

High purity 100 GeV electron identification with synchrotron radiation

Depero

Banerjee

Burtsev

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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“…Several physics programmes are performed using hadron and muon beams with the high acceptance two stage magnetic spectrometer. For the study of Primakoff reactions [2] (scattering of pions on quasi real photons originating form the electric field of nuclei) a digital trigger for electromagnetic calorimeter in the second spectrometer stage has been developed in 2009 [3]. This trigger was based on summing up all detector cells in a central region.…”

Section: Jinst 8 C02038mentioning

confidence: 99%

Upgrade of the COMPASS calorimetric trigger

Huber

Krämer

et al. 2013

J. Inst.

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In 2009 COMPASS performed a short measurement of neutral Primakoff reactions, characterised by highly energetic photons in one of the two electromagnetic calorimeters. A digital trigger was implemented in the existing readout electronics which calculates the energy released in the central region of the calorimeter. In 2012 a long measurement of these processes has been performed. In order to extend the kinematic range to lower energetic photons the trigger system has been upgraded in a way to be more selective to specific physics channels. The new ADC firmware preserves hit information and provides it to newly developed backplane trigger modules. There hits from all three thousand channels are processed and the trigger decision is made.

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