Fast photon-detection for COMPASS RICH-1

Abbon, P.; Alexeev, M.; Angerer, H.; Birsa, R.; Bordalo, P.; Bradamante, F.; Chiosso, M.; Ciliberti, P.; Colantoni, M.; Dafní, T.; Torre, S. Dalla; Delagnes, É.; Deschamps, H.; Diaz, V.; Dibiase, N.; Duic, V.; Eyrich, W.; Ferrero, A.; Finger, M.; Fisher, H.; Gerassimov, S.; Giorgi, M. A.; Gobbo, B.; Hagemann, R.; vonHarrac, D.; Heinsius, F. H.; Joosten, R.; Ketzer, B.; Königsmann, K.; Kolosov, V.N.; Konorov, I.; Kramer, D.; Kunne, F.; Lehmann, A.; Levorato, S.; Maggiora, A.; Magnon, A.; Mann, A.; Martin, A.; Menon, G.; Mutter, A.; Nähle, O.; Neyret, D.; Nerling, F.; Panebianco, S.; Panzieri, D.; Paul, S.; Pesaro, G.; Pizzolotto, C.; Polák, Jaroslav; Rebourgeard, P.; Robinet, F.; Rocco, E.; Schiavon, P.; Schill, C.; Schoenmeier, W.; Schröder, W.; Silva, L.; Sluneckai, M.; Sozzi, F.; Steiger, L.; Šulc, M.; Svec, M.; Tessarotto, F.; Teufel, Andreas; Wollny, H.

doi:10.1142/9789812819093_0007

Cited by 4 publications

(6 citation statements)

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“…Its initial configuration (see Ref. [23]) was used for data taking in 2002-2004. During the long accelerator shutdown in 2005, the set-up was modified (see Ref.…”

Section: Experimental Set-upmentioning

confidence: 99%

Azimuthal asymmetries of charged hadrons produced in high-energy muon scattering off longitudinally polarised deuterons

Adolph¹,

Aghasyan²,

Akhunzyanov³

et al. 2018

Eur. Phys. J. C

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Single hadron azimuthal asymmetries of positive and negative hadrons produced in muon semi-inclusive deep inelastic scattering off longitudinally polarised deuterons are determined using the 2006 COMPASS data and also combined all deuteron COMPASS data. For each hadron charge, the dependence of the azimuthal asymmetry on the hadron azimuthal angle φ is obtained by means of a fiveparameter fitting function that besides a φ-independent term includes four modulations predicted by theory: sin φ, sin 2φ, sin 3φ and cos φ. The amplitudes of the five terms have been extracted, first, for the hadrons in the whole available kinematic region. In further fits, performed for hadrons from a restricted kinematic region, the φ-dependence is determined as a function of one of three variables (Bjorken-x, fractional energy of virtual photon taken by the outgoing hadron and hadron transverse momentum), while disregarding the others. Except the φ-independent term, all the modulation amplitudes are very small, and no clear kinematic dependence could be observed within experimental uncertainties.

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“…Its initial configuration (see Ref. [23]) was used for data taking in 2002-2004. During the long accelerator shutdown in 2005, the set-up was modified (see Ref.…”

Section: Experimental Set-upmentioning

confidence: 99%

Azimuthal asymmetries of charged hadrons produced in high-energy muon scattering off longitudinally polarised deuterons

Adolph¹,

Aghasyan²,

Akhunzyanov³

et al. 2018

Eur. Phys. J. C

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“…The neutron polarizability is known experimentally, α n = 11.6(1.5) × 10 −4 fm 3 [1], and therefore a theoretical calculation from first principles provides a good test of QCD. The first experimental determination of the kaon polarizability will be performed as part of the COMPASS [2,3] experiment along with more precise determination of the pion polarizability.…”

Section: Introductionmentioning

confidence: 99%

Electric polarizability of neutral hadrons from dynamical lattice QCD ensembles

et al. 2014

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We present a valence calculation of the electric polarizability of the neutron, neutral pion, and neutral kaon on two dynamically generated nHYP-clover ensembles. The pion masses for these ensembles are 227(2) MeV and 306(1) MeV, which are the lowest ones used in polarizability studies. This is part of a program geared towards determining these parameters at the physical point. We carry out a high statistics calculation that allows us to: (1) perform an extrapolation of the kaon polarizability to the physical point; we find αK = 0.269(43) × 10 −4 fm 3 , (2) quantitatively compare our neutron polarizability results with predictions from χPT, and (3) analyze the dependence on both the valence and sea quark masses. The kaon polarizability varies slowly with the light quark mass and the extrapolation can be done with high confidence.

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“…A fast detection system for Cherenkov photons is needed to distinguish by time information the photons originating from scattered particles in the physics events from the background from In the central part of the detector (25% of the sensitive area) where the photon flux is largest the MWPCs with Cesium Iodide photo-cathodes have been replaced by multi-anode photomultipliers [4] and a fast read-out system based on the MAD4 [5] discriminator front-end chip and the dead-time free F1 TDC [6] (see Fig. 1).…”

Section: Motivation Of the Upgradementioning

confidence: 99%

“…The central region upgrade is performed by replacing the central part of the MWPC photon detector set by an array of 576 UV-sensitive 16 channel multi-anode PMTs H7600-03-M16 from Hamamatsu [4]. The sensitive wavelength range of these photomultipliers extends from 200 nm up to 700 nm compared to the effective sensitive range of the Cesium-Iodide photo-cathodes of 160 nm to 200 nm.…”

Section: The Upgrade Of the Central Regionmentioning

confidence: 99%

“…uncorrelated halo muons. The upgrade of the COMPASS RICH detector consists of two parts.In the central part of the detector (25% of the sensitive area) where the photon flux is largest the MWPCs with Cesium Iodide photo-cathodes have been replaced by multi-anode photomultipliers[4] and a fast read-out system based on the MAD4[5] discriminator front-end chip and the dead-time free F1 TDC[6] (see Fig.1). In the outer part, the existing MWPC chambers have been equipped with a faster read-out based on the APV preamplifier with sampling ADCs[7].…”

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confidence: 99%

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Fast photon detection for the COMPASS RICH detector

Abbon¹,

Alekseev²,

Angerer³

et al. 2007

Nuclear Physics B - Proceedings Supplements

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Particle identification at high rates is a central aspect of many present and future experiments in high-energy particle physics. The COMPASS experiment at the SPS accelerator at CERN uses a large scale Ring Imaging CHerenkov detector (RICH) to identify pions, kaons and protons in a wide momentum range. For the data taking in 2006, the COMPASS RICH has been upgraded in the central photon detection area (25% of the surface) with a new technology to detect Cherenkov photons at very high count rates of several 10 6 s −1 per channel and a new dead-time free read-out system, which allows trigger rates up to 100 kHz. The Cherenkov photons are detected by an array of 576 visible and ultra-violet sensitive multi-anode photomultipliers with 16 channels each. Lens telescopes of fused silica lenses have been designed and built to focus the Cherenkov photons onto the individual photomultipliers. The read-out electronics of the PMTs is based on the MAD4 amplifier-discriminator chip and the dead-time free high resolution F1-TDC. The 120 ps time resolution of the digital card guarantees negligible background from uncorrelated physical events. In the outer part of the detector, where the particle rates are lower, the present multi-wire proportional chambers (MWPC) with Cesium Iodide photo-cathodes have been upgraded with a new read-out electronic system based on the APV preamplifier and shaper ASIC with analog pipeline and sampling ADCs. The project was fully designed and implemented in the period November 2004 until May 2006. The upgraded detector showed an excellent performance during the 2006 data taking: the number of detected Cherenkov photons per ring was increased from 14 to above 60 at saturation. The time resolution was improved from about 3 microseconds to about one nanosecond which allows an excellent suppression of the background photons from uncorrelated events.

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Fast photon-detection for COMPASS RICH-1

Cited by 4 publications

References 0 publications

Azimuthal asymmetries of charged hadrons produced in high-energy muon scattering off longitudinally polarised deuterons

Azimuthal asymmetries of charged hadrons produced in high-energy muon scattering off longitudinally polarised deuterons

Electric polarizability of neutral hadrons from dynamical lattice QCD ensembles

Fast photon detection for the COMPASS RICH detector

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