Difference: LArCaloPublicResultsUpgrade (22 vs. 23)

Revision 232018-07-04 - PeterJohannesFalke

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  Two LAr Phase I trigger upgrade demonstrator boards (2 Demonstrator LTDBs, LAr Trigger Digitizer Boards) were installed in-situ on the LAr detector in July 2014 (coverage: 9π/16 < φ < 11π/16, 0 < η < 1.4). To receive the digital super-cell energies ABBA boards (LDPB pre-prototype) were installed in USA15. One ABBA board receives data from one LTDB 320 super cells. Super-cell data has been recorded for a large number of time slices with this pre-prototype backend electronics.
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Data from 2017 runs: Energy comparison, timing resolution, overview plots and shower properties

General Information

  • The plots show data from pp collisions, physics run 334487, recorded on August 30, 2017.
  • Events were triggered by dedicated triggers requiring either a Level 1 electromagnetic cluster (EM) with ET > 20 GeV or a Level 1 Jet with ET > 100 GeV within the demonstrator acceptance (for EM (Jet) 1.6 < φ < 2.2 (2.3), 0 < η < 1.5). Those triggers were prescaled to have a combined event rate of approximately 1 Hz.
  • Events from the LAr demonstrator are matched to events collected in the main read-out using their bunch-crossing ID and brunch-crossing time. An alternative method is the matching according to the L1 ID of the events.
  • Two different prototypes of LAr Trigger Digitizer boards (LTDBs) were installed: The first for the region φ = 1.81 and φ = 1.91; the other for φ = 2.01 and φ = 2.11. This leads to different calibration and also slightly different results for those two regions.

Description of procedure

  • Energy and timing resolution of demonstrator system
    • All events for given supercell that satisfy |Edem - Emain | / Emain < 0.5 and Emain > 2 GeV are used.
    • The events are then further separated into 15 bins with equal statistics. For each of these bins the mean and RMS value is obtained.
    • The chosen functional parametrisation for the energy resolution is given by σ/E = b/E ⊕ c and thus neglects the stochastic (shower) component (∝ 1/E0.5), as the resolution is obtained from a ratio of the two read-outs and thus both are affected in the same way by the shower fluctuations.
    • The functional parametrisation for the timing resolution is chosen to match the public plots from the main read-out.
  • Overview of mean and RMS values for energy and timing distributions
    • Out of all events with |Edem - Emain | / Emain < 0.5 and Emain > 2 GeV are used, only the 20% highest energy deposits are used. &to; Same requirement as for plots in next section.
    • The mean and RMS values are then obtained and plotted for each layer.
  • Comparison of the shower modelling
    • Supercell with highest energy in shower fulfils Emain > 20 GeV and |Edem - Emain | / Emain < 0.1.
    • Other supercells are considered if they fulfil |Edem - Emain | / Emain < 0.8 and Escell > 1% Emax.
    • The two above criteria largely resemble the selection used to extract event displays.
    • Shower cone defined as supercells within |φ - φmax | < 0.15 (three iphi layers) and |η - ηmax | < 0.05 (width of a trigger tower) of maximum energy deposit.
    • The shower shape variables are defined in the LAr Phase I Upgrade TDR as follows (with E(i) as the energy measured in the i-th layer):
      Rη = (E(2)T,Δη×Δφ=0.075×0.2)/(E(2)T,Δη×Δφ=0.175×0.2)
      wη, 2 = ((Σ(E(2)T × η2)Δη×Δφ=0.075×0.2)/(E(2)T,Δη×Δφ=0.075×0.2) - ((Σ(E(2)T × η)Δη×Δφ=0.075×0.2)/(E(2)T,Δη×Δφ=0.075×0.2))2)0.5
      f3 = (E(3)T,Δη×Δφ=0.2×0.2)/(E(1)T,Δη×Δφ=0.075×0.2 + E(2)T,Δη×Δφ=0.075×0.2 + E(3)T,Δη×Δφ=0.2×0.2)

Measured energy comparison for the middle layer: The measured supercell (SC) energies of the LAr Phase I demonstrator are compared to summed LAr cell energies in ATLAS by calculating their ratio (ESC / ΣSC Ecells) for ESC > 2 GeV. The energy spectrum is subdivided into 15 bins and the width of the distribution shown. The supercells in the middle layer consist of 4 LAr cells. The width of the energy ratio is below 1 % in the high-energy tail.

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Measured energy comparison by layer: The measured supercell (SC) energies of the LAr Phase I demonstrator are compared to summed LAr cell energies in ATLAS by calculating their ratio (ESC / ΣSC Ecells) for ESC > 2 GeV. The energy spectrum is subdivided into 15 bins and the width of the distribution shown. The supercells in the presampler, front, middle and back layer consist of 4, 8, 4 and 8 LAr cells, respectively. The width of the energy ratio is below 1 − 2 % in the high-energy tail, depending on the calorimeter layer.

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Measured timing resolution for the middle layer: The measured supercell timing distribution of the LAr Phase I demonstrator is obtained for a selected supercell. It is subdivided into 15 energy-bins and the width of the distribution shown for each bin. The timing resolution is around 0.5 ns in the high-energy tail, such that the identification of the bunch-crossing ID is possible due to the resolution being much smaller than 25 ns. The supercells in the middle layer consist of 4 LAr cells.

File 'pulseTiming_Ebinned_middle_RMS' not found!
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Measured timing resolution by layer: The measured supercell timing distribution of the LAr Phase I demonstrator is obtained for selected supercells. It is subdivided into 15 energy-bins and the width of the distribution shown for each bin. The timing resolution is below 0.5 − 1.0 ns in the high-energy tail, such that the identification of the bunch-crossing ID is possible due to the resolution being much smaller than 25 ns. The supercells in the presampler, front, middle and back layer consist of 4, 8, 4 and 8 LAr cells, respectively.

File 'comparison_timing_log' not found!
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Energy scale for demonstrator φ-slice: The measured supercell (SC) energies of the LAr Phase I demonstrator are compared to summed LAr cell energies in ATLAS by calculating their ratio (ESC / ΣSC Ecells) and the mean value of the distribution is shown. The supercells in the presampler, front, middle and back layer consist of 4, 8, 4 and 8 LAr cells, respectively. Good agreement is observed between the two systems, while residual shifts of the mean are due to the preliminary calibration of the supercells.

File 'relEDev_Mean_etaDep_19' not found!
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Energy comparison for demonstrator φ-slice: The measured supercell (SC) energies of the LAr Phase I demonstrator are compared to summed LAr cell energies in ATLAS by calculating their ratio (ESC / ΣSC Ecells) and the RMS value of the distribution is shown. The supercells in the presampler, front, middle and back layer consist of 4, 8, 4 and 8 LAr cells, respectively. The typical width of the energy ratio of the front and middle layers is well below 2%, while the presampler and back layer exhibit higher values.

File 'relEDev_RMS_etaDep_19' not found!
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Mean timing for demonstrator φ-slice: The measured supercell timing distribution of the LAr Phase I demonstrator is obtained and the mean value of the distribution shown. The identification of the bunch-crossing ID is possible due to the low deviation of the mean from 0 ns and a RMS value much smaller than 25 ns. The supercells in the presampler, front, middle and back layer consist of 4, 8, 4 and 8 LAr cells, respectively. The small shift of the means is due to the preliminary calibration of the supercells.

File 'timing_Mean_etaDep_19' not found!
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Timing resolution for demonstrator φ-slice: The measured supercell timing distribution of the LAr Phase I demonstrator is obtained and the RMS value of the distribution shown. The identification of the bunch-crossing ID is possible due to the low deviation of the mean from 0 ns and a RMS value much smaller than 25 ns. The supercells in the presampler, front, middle and back layer consist of 4, 8, 4 and 8 LAr cells, respectively. The typical timing resolution of the front and middle layers is below 1 ns, while the presampler and back layer have slight higher timing resolutions.

File 'timing_RMS_etaDep_19' not found!
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Shower modelling of the demonstrator read-out: Supercell energy and timing information of the LAr Phase I demonstrator and summed LAr cell energies in ATLAS are compared for triggered showers. Several quantities are given and show a good agreement between the two read-outs. The events were observed in pp physics data, collected on August 30, 2017. Only well-reconstructed energy deposits above 1% of EmaxSC are used. Rη gives an estimate of the energy fraction of the shower cone in the middle layer, f3 is the energy fraction of the shower in the back layer and the width of the showers is further parametrised by wη, 2.

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File 'coneOverTotal_log' not found!
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File 'energyResol' not found!
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File 'Reta' not found!
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File 'Reta_log' not found!
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File 'wEta' not found!
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File 'wEta_log' not found!
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File 'f3' not found!
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File 'f3_log' not found!
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Data from 2017 runs: pulse shapes and timing distributions

General Information
  • The plots show data from pp collisions, physics run 334487, recorded on August 30, 2017.
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