Evaluation of the ATLAS-MPX Devices for Neutron Field Spectral Composition Measurement in the ATLAS Experiment

Vykydal, Z.; Bouchami, J.; Campbell, M.; Doležal, Z.; Fiederle, M.; Greiffenberg, D.; Gutiérrez, A.; Heijne, E.H.M.; Holý, T.; Idárraga, J.; Jakůbek, J.; Král, V.; Králı́k, M.; Lebel, C.; Leroy, C.; Llopart, X.; Maneuski, D.; Nessi, M.; O’Shea, V.; Platkevič, Michal; Pospı́šil, S.; Sochor, V.; Šolc, J.; Suk, M.; Tlustos, L.; Vichoudis, P.; Visschers, J.L.; Wilhelm, I.; Žemlička, J.

doi:10.1109/nssmic.2008.4774829

Cited by 10 publications

(13 citation statements)

References 7 publications

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“…Neutral particles, namely neutrons, however, need to be converted to charged particles before they can be detected. Therefore, a part of each silicon sensor is covered by 6 LiF and polyethylene converters [7,32].…”

Section: Timepix Internal Luminosity Precisionmentioning

confidence: 99%

Luminosity Measurements at the LHC at CERN Using Medipix, Timepix and Timepix3 Devices

Sopczak

2021

Physics

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The precise determination of the luminosity is essential for many analyses in physics based on the data from the particle accelerator Large Hadron Collider (LHC) at CERN. There are different types of detectors used for the luminosity measurements. The focus of this review is on luminosity measurements with hybrid-pixel detectors and the progress made over the past decade. The first generations of detectors of the Medipix and Timepix families had frame-based readout, while Timepix3 has a quasi-continuous readout. The applications of the detectors are manifold, and in particular, the detectors have been operated in the harsh environment of the LHC. The excellent performance in detecting high fluxes of elementary particles made these detectors ideal tools to measure the delivered luminosity resulting from proton–proton collisions. Important aspects of this review are the performance improvements in relative luminosity measurements from one detector generation to another, the long-term stability of the measurements, absolute luminosity measurements, material activation (radiation-induced) corrections, and the measurement of luminosity from neutron counting. Rather than bunch-average luminosity provided by previous detector generations, owing to the excellent time-resolution, Timepix3 measured the luminosity of individual proton bunches that are 25 ns apart. This review demonstrates the large progress in the precision of luminosity measurements during LHC Run-1 and Run-2 operations using hybrid-pixel detectors, and thus their importance for luminosity measurements in the future of LHC operations.

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Section: Timepix Internal Luminosity Precisionmentioning

confidence: 99%

Luminosity Measurements at the LHC at CERN Using Medipix, Timepix and Timepix3 Devices

Sopczak

2021

Physics

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“…Neutral particles, namely neutrons, need to be converted to charged particles before they can be detected. Therefore, a part of the silicon sensor on layer-2 (the layer farther from the IP) is covered by 6 LiF and polyethylene converters [15], [16]. Photons are directly converted in the sensor.…”

Section: Tpx3 Devicementioning

confidence: 99%

Timepix3 Luminosity Determination of 13-TeV Proton–Proton Collisions at the ATLAS Experiment

Sopczak

2020

IEEE Trans. Nucl. Sci.

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Medipix and Timepix devices, installed in the ATLAS cavern, have provided valuable complementary luminosity information. Results are presented from measurements with Timepix3 (TPX3) detectors. In contrast with previously employed frame-based data acquisition, the TPX3 detector remains active continuously, sending information on pixel hits as they occur. Hit-and cluster-counting methods were used for the luminosity determination of the LHC proton-proton collisions. The LHC luminosity versus time is determined using these two methods and fitted to a simple model, which incorporates luminosity reduction from single bunch and beam-beam interactions. The precision of the luminosity determination could be improved by counting the number of clusters, instead of just pixel hits. The internal precision and long-term stability of the TPX3 luminosity measurement are below 0.5%. TPX3, owing to its 1.56 ns timetagging, is able to resolve the time structure of the luminosity due to the collisions of individual proton bunches when integrated over an LHC fill.

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“…Recently Medipix2 has been used for high resolution imaging [16] as well as for thermal and fast neutron fluence monitoring in the high energy physics (HEP) detector barrel as a Radiation Damage Monitoring (RDM) system by use of a partial cover of Medipix2 with Li and PE converters [22].…”

Section: Design Of the Novel Dosimetermentioning

confidence: 99%

Neutron Dosimeter Development Based on Medipix2

Othman

Petasecca

Guatelli

et al. 2010

IEEE Trans. Nucl. Sci.

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Abstract-A novel neutron dosimetry system for avionics and space applications is described. The new dosimetric system is based on Medipix2, a high density silicon based pixilated detector with integrated readout and digital interface circuitry. Real time dose equivalent response to fast neutron fields with flattened energy response is achieved through the coupling of a structured variable thickness polyethylene (PE) over layer with the high density pixilated detector. Experimental results obtained to 14 MeV D-T and Am-Be neutron fields are described along with a comparison to results obtained with GEANT4 simulations.Index Terms-GEANT4, Medipix2, neutron dosimetry.

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Evaluation of the ATLAS-MPX Devices for Neutron Field Spectral Composition Measurement in the ATLAS Experiment

Cited by 10 publications

References 7 publications

Luminosity Measurements at the LHC at CERN Using Medipix, Timepix and Timepix3 Devices

Luminosity Measurements at the LHC at CERN Using Medipix, Timepix and Timepix3 Devices

Timepix3 Luminosity Determination of 13-TeV Proton–Proton Collisions at the ATLAS Experiment

Neutron Dosimeter Development Based on Medipix2

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