Epic-backward-hcal-l mailing list

[Leszek Kosarzewski <leszek.kosarzewski AT gmail.com>]

Dear Colleagues

We realized that the density of the steel which is defined in materials.xml is a bit too high (8.3 g/cm^3) for a standard non-magnetic steel:

https://github.com/eic/epic/blob/dc18cc16566268b613553df110eef3d2820a82af/compact/materials.xml#L414-L419

  <material name="StainlessSteel">
    <D type="density" value="8.3" unit="g / cm3"/>
    <fraction n="0.74" ref="Fe"/>
    <fraction n="0.18" ref="Cr"/>
    <fraction n="0.08" ref="Ni"/>
  </material>

You can compare it to Steel235 used by LFHCAL:

https://github.com/eic/epic/blob/dc18cc16566268b613553df110eef3d2820a82af/compact/materials.xml#L66-L70

  <material name="Steel235">
    <D value="7.85" unit="g/cm3"/>
    <fraction n="0.998" ref="Fe"/>
    <fraction n=".002" ref="C"/>
  </material>

I think we really need to double check the material composition and density. The density will affect the simulations, so it needs to be updated to correct values.

On a separate note, I added a switch to make all layers sensitive and made a pull request to merge it into main. This is needed for the sampling fraction benchmark code in preparation now.

Best regards, Leszek