Luminosity Monitoring in ATLAS with MPX Detectors
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1 Luminosity Monitoring in ATLAS with MPX Detectors André Sopczak (IEAP CTU in Prague) on behalf of the ATLAS and Medipix2 Collaborations ATLAS conference note ATLAS-CONF th Topical Seminar on Innovative Particle and Radiation Detectors (IPRD13) Siena, Italy 9 October 2013
2 Outline Introduction Luminosity from Hit Counting Luminosity from Thermal Neutron Counting van der Meer Scans Conclusions A.Sopczak 9 Oct
3 Focus on MPX network 2012 data from 8 TeV proton-proton collisions 16 Medipix2 (MPX) pixel detectors operating in ATLAS from 2008 to Feb. 2013, acquisition time 0.1ms-600s. For luminosity measurements usage as (256x256) independent counting detectors. Measure the particle fluxes originating from the LHC proton-proton collisions. A.Sopczak 9 Oct
4 The ATLAS detector A.Sopczak 9 Oct
5 MPX detectors for luminosity determination: MPX01-MPX13 used ATLAS Detector A.Sopczak 9 Oct
6 MPX locations and particle (cluster) fluences in the ATLAS detector ATLAS Detector A.Sopczak 9 Oct
7 Method of luminosity monitoring with hit counting Measure number of counts by 13 independent MPX devices during collision periods. Apply three different methods to remove noisy pixels from the hit counting. Normalize MPX hit rate/luminosity with the ATLAS BCM luminosity detector for the data taking on 21 May Study the MPX/BCM luminosity ratio as a function of time for all 2012 data. A.Sopczak 9 Oct
8 MPX luminosity A.Sopczak 9 Oct
9 MPX/BCM luminosity ratio A.Sopczak 9 Oct
10 MPX01 hit luminosity vs. bunchaveraged interactions per crossing A.Sopczak 9 Oct
11 Fractional deviation in luminosity (hit counting mode) L MPX L BCM A.Sopczak 9 Oct
12 Method of luminosity monitoring with thermal neutron counting Thermal neutrons detected by MPX devices via 6 Li(n,α) 3 H reactions in a 6 LiF converter layer. Resulting tritons and alpha particles are registered as heavy blobs (large round-shaped pixel clusters). Typical detection efficiency of thermal neutrons 1%. Normalize MPX thermal neutron rate/luminosity with the BCM ATLAS luminosity detector for the data taking on 21 May Study the MPX/BCM luminosity ratio as a function of time for 2012 data. A.Sopczak 9 Oct
13 Number of heavy blobs per frame A.Sopczak 9 Oct
14 Fractional deviation in luminosity (thermal neutron counting mode) A.Sopczak 9 Oct
15 Fractional deviation in the number of interactions per bunch crossing A.Sopczak 9 Oct
16 van der Meer scan peak (last horizontal scan in November 2012) At LHC, van der Meer scans (vdm) are used for absolute luminosity calibration. This study focuses on comparisons of the ratio of MPX versus the BCM luminosity measurements in order to quantify the relative stability of the BCM and MPX luminosity calibrations. BCM MPX01 A.Sopczak 9 Oct
17 van der Meer scan: linearity MPX01 hit vs. BCM luminosities A.Sopczak 9 Oct
18 Conclusions MPX network successful data-taking 2008 to Sufficiently radiation hard for the 2012 high-luminosity. MPX network has an internal consistency of about 2% using different detectors and techniques for hit counting and heavy blob (thermal neutron) counting as measures of luminosity. This precision is comparable to other luminosity detectors in ATLAS in the same 2012 time period. MPX 2012 van der Meer scan luminosity four orders of magnitude lower than routine physics data-taking: MPX has wide dynamic range ~ cm -2 s -1. A.Sopczak 9 Oct
19 References A.Sopczak 9 Oct
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