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

Late shower start in HCAL stack

Peter Speckmayer

Peter Speckmayer, LCD weekly


Late shower start

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

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

late start/ example

Peter Speckmayer, LCD weekly


Late start example1

late start/ example

Peter Speckmayer, LCD weekly


Late start example2

late start/ example

Peter Speckmayer, LCD weekly


Tracking region

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 region1

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

After shortening of tracking region

Peter Speckmayer, LCD weekly


Late shower start in hcal stack

Peter Speckmayer, LCD weekly


Wrong correct samples

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

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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