Late shower start in hcal stack
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Late shower start in HCAL stack. Peter Speckmayer. Late shower start. History: once upon a time... we had a layer numbering problem. HCAL stack layer number were reversed (first layer highest number) sometimes incorrect reversing of layer numbers

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Late shower start in HCAL stack

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Late shower start in HCAL stack

Peter Speckmayer

Peter Speckmayer, LCD weekly


Late shower start

  • History:

    • once upon a time...

      • we had a layer numbering problem.

      • HCAL stack layer number were reversed (first layerhighest number)

      • sometimes incorrect reversing of layer numbers

        • shortenes artificially the HCAL (some layers not taken into account)

        • has been fixed then

      • change in geometryconverter  layers start with No. 0

Peter Speckmayer, LCD weekly


Late shower start 2

  • Detected similar problem again

    • not related to old (and fixed) bug

    • but same symptoms

Peter Speckmayer, LCD weekly


late start/ example

Peter Speckmayer, LCD weekly


late start/ example

Peter Speckmayer, LCD weekly


late start/ example

Peter Speckmayer, LCD weekly


Tracking region

  • compact.xml:

    <!-- tracking region -->

    <constant name="tracking_region_radius" value="126.5*cm"/>

    <constant name="tracking_region_zmax" value="100.*cm"/>

    • Define layers of HCAL (material, thickness), define number of layers, define center of HCAL

    • HCAL center differs for different set ups

  • lcdd:

    <constant name="tracking_region_zmax" value="1000.0" />

    <constant name="world_x" value="50000.0" />

    <position name="HCAL_position" x="0.0" y="0.0" z="4000.0" unit="mm" />

    <position name="HCAL_layerType0_slice0_position" x="0.0" y="0.0" z="-3.75" unit="mm" />

    <position name="HCAL_layerType0_slice1_position" x="0.0" y="0.0" z="3.75" unit="mm" />

    <position name="HCAL_layerType0_slice2_position" x="0.0" y="0.0" z="7.5" unit="mm" />

    <position name="HCAL_layer0_position" x="0.0" y="0.0" z="-3491.25" unit="mm" />

  • Tracking region reaches into Calorimeter

    • no calorimeter hits from impinging particle while in tracking region

    • but calorimeter hits from back-scattered particles

Peter Speckmayer, LCD weekly


Tracking region

  • solution so far:

    • reduce tracking region to 1 cm in z

    • re-submitted all simulations with corrected tracking region

      • next step: reconstruction, creating ROOT-trees

      • then: training of neural net

      • this time: want to go down to 3 lambda (up to now: 6 lambda)

  • wait for detailed explanation about tracking region

Peter Speckmayer, LCD weekly


After shortening of tracking region

Peter Speckmayer, LCD weekly


Peter Speckmayer, LCD weekly


Wrong/correct samples

wrong (material, thickness)

correct (material, thickness)

W-steel15, 10

Steel-W15, 10

steel30, 25, 15

W05, 10, 15

  • W-steel20

  • Steel-W20

  • Steel20, 10

  • W20

Peter Speckmayer, LCD weekly


Summary

  • some HCAL stacks wrong

  • problem found

  • re-simulate ALL stacks (on the grid)

    • reconstruct down to 3 lambda

Peter Speckmayer, LCD weekly


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