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FIT/FT0: new functions for FT0 to reconstruct event plane #11651

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FIT/FT0: new functions for FT0 to reconstruct event plane #11651

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Jul 18, 2023
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Please consider the following formatting changes
alibuild Jul 18, 2023
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Merge pull request #4 from alibuild/alibot-cleanup-11651
jikim1290 Jul 18, 2023
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25 changes: 24 additions & 1 deletion Detectors/FIT/FT0/base/include/FT0Base/Geometry.h
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Expand Up @@ -65,11 +65,34 @@ class Geometry
return o2::base::GeometryManager::getPNEntry(getDetID(), index);
}

// NEW:
// Calculate the coordinates of all the channels.
void calculateChannelCenter();
// Get the coordinates of the center of the channel channelId.
TVector3 getChannelCenter(UInt_t channelId) { return mChannelCenter[channelId]; }
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@afurs afurs Jul 12, 2023

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please put const

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@martenole martenole Jul 13, 2023

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since this returns a copy in any case I don't think const makes a difference, but up to you of course the way you want to use this function

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@jikim1290 jikim1290 Jul 14, 2023

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I have added const for integrity of the system.


private:
TVector3 mMCP[52];
TVector3 mAngles[28];
std::array<TVector3, Nchannels> mChannelCenter; ///< NEW: Center of each channel in FT0 A (96) and C (112) combined.

// Convert the local ordering of the channels to the official one and apply it to the channel map.
// localChannelOrder[local channel index] = official channel.
Int_t localChannelOrder[Nchannels] = {
58, 56, 59, 57, 54, 52, 55, 53, 50, 49, 51, 48, 47, 45, 46, 44, 43, 42, 41, 40,
61, 60, 63, 62, 14, 12, 15, 13, 10, 9, 11, 8, 7, 6, 5, 4, 39, 38, 37, 36,
65, 64, 66, 67, 17, 16, 18, 19, 3, 2, 0, 1, 35, 34, 32, 33,
68, 69, 70, 71, 20, 21, 22, 23, 24, 27, 25, 26, 29, 31, 28, 30, 94, 95, 92, 93,
72, 73, 74, 75, 76, 78, 77, 79, 80, 83, 81, 82, 85, 87, 84, 86, 89, 91, 88, 90,
173, 172, 175, 174, 206, 207, 204, 205, 169, 168, 171, 170, 202, 203, 200, 201,
117, 116, 119, 118, 142, 143, 140, 141, 114, 112, 115, 113, 137, 139, 136, 138,
166, 164, 167, 165, 197, 199, 196, 198, 110, 108, 111, 109, 133, 135, 132, 134,
162, 160, 163, 161, 193, 195, 192, 194, 107, 105, 106, 104, 128, 130, 129, 131,
159, 157, 158, 156, 188, 190, 189, 191, 99, 98, 97, 96, 120, 121, 122, 123,
103, 102, 101, 100, 124, 125, 126, 127, 155, 153, 154, 152, 184, 186, 185, 187,
147, 146, 145, 144, 176, 177, 178, 179, 151, 150, 149, 148, 180, 181, 182, 183};

ClassDefNV(Geometry, 2);
ClassDefNV(Geometry, 3);
};
} // namespace ft0
} // namespace o2
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58 changes: 58 additions & 0 deletions Detectors/FIT/FT0/base/src/Geometry.cxx
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Expand Up @@ -117,3 +117,61 @@ void Geometry::setCsideModules()
mMCP[i + NCellsA].SetXYZ(xc2[i], yc2[i], zc2[i]);
}
}
void Geometry::calculateChannelCenter()
{
// This method calculates the position of each channel center composing both FT0-A
// and FT0-C, based on the position of their corresponding modules given by
// "Geometry::setAsideModules()" and "Geometry::setCsideModules()".

// Ensure the positions of the modules are well defined.
setAsideModules();
setCsideModules();

// Calculate first the positions for the channels for FT0-A. These correspond to the
// channels 0-95 in the modules mMCP[0-23].
Double_t delta = 5.3 / 4.; // Half-channel width (TODO: ask if it actually corresponds to ChannelWidth)
Double_t xLocalChannels[Nchannels]; // x-positions of all channels ordered according to xi and internal numbering.
Double_t yLocalChannels[Nchannels]; // y-positions of all channels ordered according to yi and internal numbering.
Double_t zLocalChannels[Nchannels]; // z-positions of all channels ordered according to zi and internal numbering.
// INFO: We assume here the modules are perpendicular to z, so z(channel) = z(module).

for (int iModA = 0; iModA < NCellsA; iModA++) {
xLocalChannels[4 * iModA + 0] = mMCP[iModA].X() - delta;
xLocalChannels[4 * iModA + 1] = mMCP[iModA].X() + delta;
xLocalChannels[4 * iModA + 2] = mMCP[iModA].X() - delta;
xLocalChannels[4 * iModA + 3] = mMCP[iModA].X() + delta;

yLocalChannels[4 * iModA + 0] = mMCP[iModA].Y() + delta;
yLocalChannels[4 * iModA + 1] = mMCP[iModA].Y() + delta;
yLocalChannels[4 * iModA + 2] = mMCP[iModA].Y() - delta;
yLocalChannels[4 * iModA + 3] = mMCP[iModA].Y() - delta;

zLocalChannels[4 * iModA + 0] = mMCP[iModA].Z();
zLocalChannels[4 * iModA + 1] = mMCP[iModA].Z();
zLocalChannels[4 * iModA + 2] = mMCP[iModA].Z();
zLocalChannels[4 * iModA + 3] = mMCP[iModA].Z();
}

// Calculate then the positions for the channels for FT0-C, corresponding to the
// channels 96-207 in the modules mMCP[24-51].
for (int iModC = 0; iModC < NCellsC; iModC++) {
xLocalChannels[4 * (iModC + NCellsA) + 0] = mMCP[iModC + NCellsA].X() - delta;
xLocalChannels[4 * (iModC + NCellsA) + 1] = mMCP[iModC + NCellsA].X() + delta;
xLocalChannels[4 * (iModC + NCellsA) + 2] = mMCP[iModC + NCellsA].X() - delta;
xLocalChannels[4 * (iModC + NCellsA) + 3] = mMCP[iModC + NCellsA].X() + delta;

yLocalChannels[4 * (iModC + NCellsA) + 0] = mMCP[iModC + NCellsA].Y() + delta;
yLocalChannels[4 * (iModC + NCellsA) + 1] = mMCP[iModC + NCellsA].Y() + delta;
yLocalChannels[4 * (iModC + NCellsA) + 2] = mMCP[iModC + NCellsA].Y() - delta;
yLocalChannels[4 * (iModC + NCellsA) + 3] = mMCP[iModC + NCellsA].Y() - delta;

zLocalChannels[4 * (iModC + NCellsA) + 0] = mMCP[iModC + NCellsA].Z();
zLocalChannels[4 * (iModC + NCellsA) + 1] = mMCP[iModC + NCellsA].Z();
zLocalChannels[4 * (iModC + NCellsA) + 2] = mMCP[iModC + NCellsA].Z();
zLocalChannels[4 * (iModC + NCellsA) + 3] = mMCP[iModC + NCellsA].Z();
}

for (int iChannel = 0; iChannel < Nchannels; iChannel++) {
mChannelCenter[localChannelOrder[iChannel]].SetXYZ(xLocalChannels[iChannel], yLocalChannels[iChannel], zLocalChannels[iChannel]);
}
}