From 12fadb8c682080c5e3f093a44f36f40a68f696c8 Mon Sep 17 00:00:00 2001
From: John Derek Chapman <chapman@hep.phy.cam.ac.uk>
Date: Thu, 16 Jul 2020 09:02:17 +0000
Subject: [PATCH] Merge branch 'sTGCStrips' into '21.3'
Redefine sTGC staggered strip Position
See merge request atlas/athena!34781
(cherry picked from commit caa1e13abd98b40276f564befd8f6947f9bd4fd4)
bdf4c887 Redifine sTGC staggered strip Position
---
.../MuonReadoutGeometry/MuonChannelDesign.h | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/MuonSpectrometer/MuonDetDescr/MuonReadoutGeometry/MuonReadoutGeometry/MuonChannelDesign.h b/MuonSpectrometer/MuonDetDescr/MuonReadoutGeometry/MuonReadoutGeometry/MuonChannelDesign.h
index f57b21a72b6..8143bce4ca6 100644
--- a/MuonSpectrometer/MuonDetDescr/MuonReadoutGeometry/MuonReadoutGeometry/MuonChannelDesign.h
+++ b/MuonSpectrometer/MuonDetDescr/MuonReadoutGeometry/MuonReadoutGeometry/MuonChannelDesign.h
@@ -293,12 +293,18 @@ namespace MuonGM {
if( st < 1 ) return false;
if( st > nch ) return false;
// We return the position in the center of the strip pitch
- // in a 3.2mm pitch strip, we return at the centre ie after 1.6mm
- // for the half strips (either first or last strips), we return after 0.8mm
- if (st == 1) x = firstPos - 0.5 * firstPitch; // return center of the first strip
+ // in a 3.2mm pitch strip, we return at the centre of the copper ie after 1.6mm
+ // for the half strips (either first or last strips), the centre of the copper is not the centre of the half strip, ie NOT 1.6mm/2
+ // a half strip is 1.35mm of copper + 0.25mm of "gap" = 1.6mm
+ if (st == 1){ // if First strip
+ if (firstPitch == 1.6) x = firstPos - 0.25 - 0.5 * 1.35; // remove 0.25mm gap and half of the copper pitch for half strips (1.35mm/2)
+ else x = firstPos - 0.5 * firstPitch; // return center of the first strip
+ }
else if (st <= nch) x = firstPos + (st-1.5) * inputPitch;
else return false;
- if (st == nch && firstPitch == 3.2) x = x - firstPitch/4; // accounts for staggering
+ // If last strip is staggered (first strip is NOT staggered)
+ // remove half the copper to return centre of copper of strip
+ if (st == nch && firstPitch == 3.2) x = x - 1.35 * 0.5; // accounts for staggering
pos[0] = x;
pos[1] = 0;
}
--
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