MPX detectors as LHC luminosity monitor

Sopczak, A.; Ali, B.; Asbah, N.; Bergmann, B.; Bekhouche, Khaled; Caforio, D.; Campbell, M.; Heijne, E.H.M.; Leroy, C.; Lipniacka, A.; Nessi, M.; Pospı́šil, S.; Šolc, J.; Soueid, P.; Suk, M.; Tureček, D.; Vykydal, Z.

doi:10.1109/nssmic.2015.7581870

Cited by 5 publications

(16 citation statements)

References 2 publications

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“…The Medipix (MPX) detectors are hybrid silicon pixel devices, which are distributed around the ATLAS detector [12] and are primarily used to monitor radiation conditions in the experimental hall. Each of these 12 devices consists of a 2 cm 2 silicon sensor matrix, segmented in 256 × 256 cells and bump-bonded to a readout chip.…”

Section: Hit Counting In the Medipix Systemmentioning

confidence: 99%

Luminosity determination in pp collisions at $$\sqrt{s}$$ s = 8 TeV using the ATLAS detector at the LHC

Aaboud¹,

Kupčo²,

Davison³

et al. 2016

Eur. Phys. J. C

266

209

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The luminosity determination for the ATLAS detector at the LHC during pp collisions at 8 TeV in 2012 is presented. The evaluation of the luminosity scale is performed using several luminometers, and comparisons between these luminosity detectors are made to assess the accuracy, consistency and long-term stability of the results. A luminosity uncertainty of is obtained for the of pp collision data delivered to ATLAS at 8 TeV in 2012.

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Section: Hit Counting In the Medipix Systemmentioning

confidence: 99%

Luminosity determination in pp collisions at $$\sqrt{s}$$ s = 8 TeV using the ATLAS detector at the LHC

Aaboud¹,

Kupčo²,

Davison³

et al. 2016

Eur. Phys. J. C

266

209

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“…The number of HB per frame is converted into the number of HB per luminosity block (LB) [12] of 60 s length. Frames are selected which lie within the time window of the LB, and the numbers of HB of these frames are averaged.…”

Section: Tpx Luminosity From Thermal Neutron Countingmentioning

confidence: 99%

“…The use of the TPX network for luminosity measurements has several advantages compared with the previous luminosity measurements [12] at LHC during Run-1 that used MPX devices. The two-layer hodoscope structure of the TPX devices This work is licensed under a Creative Commons Attribution 3.0 License.…”

mentioning

confidence: 99%

Determination of Luminosity With Thermal Neutron Counting Using TPX Detectors in the ATLAS Cavern in LHC Proton-Proton Collisions at 13 TeV

Sopczak

Ali

Begera

et al. 2018

IEEE Trans. Nucl. Sci.

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A network of Timepix (TPX) devices installed in the ATLAS cavern has the unique capability of measuring the luminosity with thermal neutron counting in Large Hadron Collider proton-proton collisions at 13 TeV. Compared with the hit-counting method, the method of thermal neutron counting has the advantage that it is not affected by induced radioactivity. The results of the luminosity determination are presented for several independently operated TPX detectors. The long-term time stability measurements of the luminosity are presented for individual devices and between different devices. The highstatistics data sets allow a detailed comparison between neutron counting and hit-counting luminosity determinations.

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“…Precision luminosity measurements are of particular importance for many analyses in high-energy physics. Networks of hybrid active pixel detectors from the Medipix/Timepix family [1] installed in ATLAS cavern [2] successfully demonstrated their potential to determine luminosity [3], [4]. Recently, the latest generation Timepix detectors, namely Timepix3 (TPX3) [5], were installed in the ATLAS cavern at CERN [6].…”

Section: Introductionmentioning

confidence: 99%

“…The use of the TPX3 device for luminosity measurements has several advantages compared to the previous luminosity measurements at the LHC during Run-1 (MPX devices) [3] and Run-2 (TPX devices) [4].…”

Section: Introductionmentioning

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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MPX detectors as LHC luminosity monitor

Cited by 5 publications

References 2 publications

Luminosity determination in pp collisions at $$\sqrt{s}$$ s = 8 TeV using the ATLAS detector at the LHC

Luminosity determination in pp collisions at $$\sqrt{s}$$ s = 8 TeV using the ATLAS detector at the LHC

Determination of Luminosity With Thermal Neutron Counting Using TPX Detectors in the ATLAS Cavern in LHC Proton-Proton Collisions at 13 TeV

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

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