S. Meneghini

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Papers by S. Meneghini

A 20 ps TDC readout module for the ALICE Time of Flight system: design and test results

The ALICE Time-of-Flight (TOF) system will be a large area (140 m2) detector made by Multigap RPC... more The ALICE Time-of-Flight (TOF) system will be a large area (140 m2) detector made by Multigap RPC (MRPC). A VME TDC Readout Module (TRM) hosting each 30 High Performance TDC chips (HPTDC) will perform the time digitisation. Tests carried out on various board prototypes towards final TRM design are discussed, emphasizing the optimization of the effective time resolution of the chip when working in its Very High Resolution Mode. Lab bench tests and tests beam results are presented, showing that a 20 ps resolution has been achieved. I.

$The TOT signal from front-end cards gives, with the leading edge, the time of the hit and, with the width, an equivalent measurement of the amplitude. Slewing corrections are then applied according the measured width. In this context it was important to assess the minimum time between two consecutive measurements. Fig. 5 shows the fraction of “complete” pulses (both leading and trailing edges detected) for different pulse widths. Figure 5: Fraction of complete pulses (leading and trailing) detected by the HPTDC as a function of the pulse width.$

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New high precision measurements of the cosmic charged particle rate beyond the Arctic Circle with the PolarquEEEst experiment

The European Physical Journal C

The goal of the PolarquEEEst experiment was to measure the cosmic charged particle rate at latitu... more The goal of the PolarquEEEst experiment was to measure the cosmic charged particle rate at latitudes greater than 66$$^{\circ }$$ ∘ N, where no systematic and accurate measurements at sea level have ever been performed. A latitude range well above the Arctic Circle was explored on board of a sailboat, up to the unprecedented northernmost value of $$82^{\circ }07^{\prime }$$ 82 ∘ 07 ′ N. In this paper a description of the experimental set-up is reported, then the procedures for calibration and data analysis are described in detail. The results show that the rate measured in this latitude range stays constant within a novel accuracy of $$\pm 1$$ ± 1 %.

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P P 2 0 1 8 ) 0 2 2 A 1 GS / s sampling digitizer designed with interleaved architecture ( GSPS ) for the LaBr 3 detectors of the FAMU experiment

A fast continuous sampling digitizer has been designed to acquire fast scintillating detector sig... more A fast continuous sampling digitizer has been designed to acquire fast scintillating detector signal from cerium activated lantanum bromide (LaBr3(Ce)) scintillation crystal. These are foreseen in the FAMU experiment which is aimed at spectroscopic measurements of muonic hydrogen, possibly providing insights into the so-called proton radius puzzle. The board, named GSPS, is implemented as an FMC mezzanine which hosts two off-the-shelf sampling ADC used in interleaved timing architecture, achieving a 1 GS/s sampling rate (with a 12-bit nominal accuracy over the first Nyquist interval of frequencies, ranging from DC to 500 MHz). Interleaved technique allowed us to keep both lower production costs and simple acquisition system avoiding complex interface protocols like JESD204. The board will be described; the test setup and the used methodology to characterize the device will be explained; the achieved performances will be shown and discussed. In particular it will be pointed out how t...

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2 0 A ug 2 01 8 FAMU : study of the energy dependent transfer rate Λ μ p → μ

The main goal of the FAMU experiment is the measurement of the hyperfine splitting (hfs) in the 1... more The main goal of the FAMU experiment is the measurement of the hyperfine splitting (hfs) in the 1S state of muonic hydrogen ∆Ehfs(μ −p)1S. The physical process behind this experiment is the following: μp are formed in a mixture of hydrogen and a higher-Z gas. When absorbing a photon at resonance-energy ∆Ehfs ≈ 0.182 eV, in subsequent collisions with the surrounding H2 molecules, the μp is quickly de-excited and accelerated by ∼ 2/3 of the excitation energy. The observable is the time distribution of the K-lines X-rays emitted from the μZ formed by muon transfer (μp) + Z → (μZ)∗ + p, a reaction whose rate depends on the μp kinetic energy. The maximal response, to the tuned laser wavelength, of the time distribution of X-ray from K-lines of the (μZ)∗ cascade indicate the resonance. During the preparatory phase of the FAMU experiment, several measurements have been performed both to validate the methodology and to prepare the best configuration of target and detectors for the spectrosc...

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New high precision measurements of the cosmic charged particle rate beyond the Arctic Circle with the PolarquEEEst experiment

The goal of the PolarquEEEst experiment was to measure the cosmic charged particle rate at latitu... more The goal of the PolarquEEEst experiment was to measure the cosmic charged particle rate at latitudes greater than 66◦ N, where no systematic and accurate measurements at sea level have ever been performed. A latitude range well above the Arctic Circle was explored on board of a sailboat, up to the unprecedented northernmost value of 82◦07′ N. In this paper a description of the experimental set-up is reported, then the procedures for calibration and data analysis are described in detail. The results show that the rate measured in this latitude range stays constant within a novel accuracy of ±1%.

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Erratum to: New high precision measurements of the cosmic charged particle rate beyond the Arctic Circle with the PolarquEEEst experiment

The European Physical Journal C

In the original version of this article, the names of four authors were missing in the author lis... more

A multi-channel trigger and acquisition board for TDC-based readout: application to the cosmic rays detector of the PolarQuEEEst 2018 project

Proceedings of Topical Workshop on Electronics for Particle Physics — PoS(TWEPP2019)

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The new LUCID-2 detector for luminosity measurement and monitoring in ATLAS

Journal of Instrumentation

LUminosity Cherenkov Integrating Detector), had to be upgraded for the second run of the LHC acce... more LUminosity Cherenkov Integrating Detector), had to be upgraded for the second run of the LHC accelerator that started in spring 2015. The increased energy of the proton beams and the higher luminosity required a redesign of LUCID to cope with the more demanding conditions. The novelty of the LUCID-2 detector is that it uses the thin quartz windows of photomultipliers as Cherenkov medium and a small amounts of radioactive 207 Bi sources deposited on to these windows to monitor the gain stability of the photomultipliers. The result is a fast and accurate luminosity determination that can be kept stable during many months of data taking. LUCID-2 can also measure the luminosity accurately online for each of the up to 2808 colliding bunch pairs in the LHC. These bunch pairs are separated by only 25 ns and new electronics has been built that can count not only the number of pulses above threshold but also integrate the pulses. K : Cherenkov detectors; Photon detectors for UV, visible and IR photons (vacuum) (photomultipliers, HPDs, others) 1Corresponding author.

format_quoteLUCID-2 enabled rapid luminosity feedback every 1-2 seconds, essential for beam optimization and cross-section measurements at the LHC.format_quote

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First FAMU observation of muon transfer from μp atoms to higher-Z elements

Journal of Instrumentation

The FAMU experiment aims to accurately measure the hyperfine splitting of the ground state of the... more The FAMU experiment aims to accurately measure the hyperfine splitting of the ground state of the muonic hydrogen atom. A measurement of the transfer rate of muons from hydrogen to heavier gases is necessary for this purpose. In June 2014, within a preliminary experiment, a pressurized gas-target was exposed to the pulsed low-energy muon beam at the RIKEN RAL muon facility (Rutherford Appleton Laboratory, U.K.). The main goal of the test was the characterization of both the noise induced by the pulsed beam and the X-ray detectors. The apparatus, to some extent rudimental, has served admirably to this task. Technical results have been published that prove the validity of the choices made and pave the way for the next steps. This paper presents the results of physical relevance of measurements of the muon transfer rate to carbon dioxide, oxygen, and argon from non-thermalized excited µp atoms. The analysis methodology and the approach to the systematics errors are useful for the subsequent study of the transfer rate as function of the kinetic energy of the µp currently under way.

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A 20 ps TDC readout module for the ALICE time of flight system design and test results

A 1 GS/s sampling digitizer designed with interleaved architecture (GSPS) for the LaBr3 detectors of the FAMU experiment

Proceedings of Topical Workshop on Electronics for Particle Physics — PoS(TWEPP2018)

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The ALICE experiment at the CERN LHC

Journal of Instrumentation, Aug 1, 2008

ABSTRACT: ALICE (A Large Ion Collider Experiment) is a general-purpose, heavy-ion detector at the... more ABSTRACT: ALICE (A Large Ion Collider Experiment) is a general-purpose, heavy-ion detector at the CERN LHC which focuses on QCD, the strong-interaction sector of the Standard Model. It is designed to address the physics of strongly interacting matter and the quark-gluon plasma at extreme values of energy density and temperature in nucleus-nucleus collisions. Besides running with Pb ions, the physics programme includes collisions with lighter ions, lower energy running and dedicated proton-nucleus runs. ALICE will also ...

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Steps towards the hyperfine splitting measurement of the muonic hydrogen ground state: pulsed muon beam and detection system characterization

by S. Meneghini and P. Danev

Journal of Instrumentation, 2016

A DMA link and a Qbus I/O-mapped interface to connect the microvax with the VMEbus

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1990

... North-Holland A DMA LINK AND A QBUS 1/0-MAPPED INTERFACE TO CONNECT THE MICROVAX WITH THE VME... more

The photomultiplier gain monitoring system for the E687 electromagnetic calorimeter at Fermilab

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1991

... Articles Articles, All fields, Author, Advanced search. ... Methods m Physics Research A305 (... more

A proposal for the trigger of the FAST detector

A cellular neural network for peak finding in high-energy physics

Proceedings of the 2000 6th IEEE International Workshop on Cellular Neural Networks and their Applications (CNNA 2000) (Cat. No.00TH8509), 2000

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Magnetic Field and Radiation Tests of a Programmable Delay Line

by S. Meneghini and G. Pellegrini

Astroparticle, Particle and Space Physics, Detectors and Medical Physics Applications - Proceedings of the 9th Conference, 2006

Programmable Delay Lines (PDLs) are widely used in trigger systems. We performed tests under radi... more Programmable Delay Lines (PDLs) are widely used in trigger systems. We performed tests under radiation and magnetic field for the chip 3D3418-0.25, to be used in the ALICE-TOF trigger system. The tests showed that this chip can comfortably operate in a 0.6 T magnetic field and tolerate a dose larger than 446 Gy.

Quality Assurance procedures for the construction of ALICE TOF detector

by S. Meneghini and M. Furini

Nuclear Physics B - Proceedings Supplements, 2006

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The MRPC detector for the ALICE Time Of Flight System: Final Design and Performances

by S. Meneghini and M. Furini

Nuclear Physics B - Proceedings Supplements, 2006

ALICE Collaboration, Time Of Flight System, Technical Design Report, CERN/LHCC 2000-12 ALICE TDR ... more

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