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[ALICE3] adding trapezoidal disk option for FT3; fixing overlaps in FT3 and TOF#15158

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[ALICE3] adding trapezoidal disk option for FT3; fixing overlaps in FT3 and TOF#15158
altsybee wants to merge 4 commits intoAliceO2Group:devfrom
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@altsybee
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@altsybee altsybee commented Mar 13, 2026

  • adding trapezoidal disk option for FT3
  • adding choice for FT3 geo (TGeoTube disks, trapezoidal, segmented); removing also (obsolete?)Telescope option.
  • fixing overlaps in FT3 OT modules
  • fixing overlap of sub-volumes with the surrounding layer tube in barrel iTOF and oTOF
  • change tilting angle for TOF staves (10 deg --> 3 deg for iTOF, 5 deg --> 3 deg for oTOF; no overlaps are observed)

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@njacazio njacazio changed the title adding trapezoidal disk option for FT3; fixing overlaps in FT3 and TOF [ALICE3] adding trapezoidal disk option for FT3; fixing overlaps in FT3 and TOF Mar 13, 2026
@njacazio
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Ciao Igor, the tilt angle of the TOF modules why the need to change it?

@njacazio
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Thanks for fixing the extrusions, I forgot to implement the shift for oTOF, now it's in #15159

@altsybee
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altsybee commented Mar 13, 2026

Ciao Nicolo,
the tilting angle of 10 deg leads to significant gaps between nearby staves in iTOF, and the iTOF staves almost touch the ML6, so that in the ACTS the iTOF and ML6 layers are merged into a single layer:
image
With a smaller angle , it doesn't happen:
image

tilting 10 deg.:
[17:05:42][INFO] iTOF kBarrelSegmented layout: stave tilt angle 10, layer tube rMin 18.235856432390264, rMax 19.954144101667353
tilting 3 deg.:
[17:11:33][INFO] iTOF kBarrelSegmented layout: stave tilt angle 3, layer tube rMin 18.563299484120623, rMax 19.626701049936994

Maybe it will also work with intermediate angles... What would be the minimal realistic angle?

@njacazio
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I see, the tilt angle was picked from the CAD studies with the full staves. 10 and 5 were chosen. Do you consider the iTOF at 21 cm?

@altsybee
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I see, the tilt angle was picked from the CAD studies with the full staves. 10 and 5 were chosen. Do you consider the iTOF at 21 cm?

The tilts were 10 deg and 10 deg for both TOFs, do you mean 5 deg for iTOF? then it might be Ok.

iTOF at 21 cm - if TOF experts agree, maybe we move it now? Also, oTOF - to 92 cm?..

@njacazio
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#15140 updated the dimensions already, here we have 5 and 10 degrees

@altsybee
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#15140 updated the dimensions already, here we have 5 and 10 degrees

Ah right, I updated my O2 before #15140 was merged

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