Author: [log in to unmask]
Date: Wed Jan 21 00:50:35 2015
New Revision: 3496
Log:
Add a method that sets the geometry and electrical characteristics of an HpsSiSensor. This method was ported from the class SvtSensorSetup located in the tracking module of the hps-java package.
Modified:
projects/lcsim/trunk/detector-framework/src/main/java/org/lcsim/detector/tracker/silicon/HpsSiSensor.java
Modified: projects/lcsim/trunk/detector-framework/src/main/java/org/lcsim/detector/tracker/silicon/HpsSiSensor.java
=============================================================================
--- projects/lcsim/trunk/detector-framework/src/main/java/org/lcsim/detector/tracker/silicon/HpsSiSensor.java (original)
+++ projects/lcsim/trunk/detector-framework/src/main/java/org/lcsim/detector/tracker/silicon/HpsSiSensor.java Wed Jan 21 00:50:35 2015
@@ -1,12 +1,25 @@
package org.lcsim.detector.tracker.silicon;
+
+import hep.physics.matrix.BasicMatrix;
+import hep.physics.vec.BasicHep3Vector;
+import hep.physics.vec.VecOp;
import java.util.HashMap;
import java.util.HashSet;
+import java.util.List;
import java.util.Map;
import java.util.Set;
import org.lcsim.detector.IDetectorElement;
+import org.lcsim.detector.IRotation3D;
+import org.lcsim.detector.ITranslation3D;
+import org.lcsim.detector.RotationPassiveXYZ;
+import org.lcsim.detector.Transform3D;
+import org.lcsim.detector.Translation3D;
import org.lcsim.detector.identifier.IIdentifier;
+import org.lcsim.detector.solids.Box;
+import org.lcsim.detector.solids.LineSegment3D;
+import org.lcsim.detector.solids.Polygon3D;
/**
* This class extends {@link SiSensor} with conditions specific to HPS SVT half-modules
@@ -31,14 +44,35 @@
public final static int TP_INDEX = 2;
public final static String ELECTRON_SIDE = "ELECTRON";
- public final static String POSITRON_SIDE = "ELECTRON";
-
+ public final static String POSITRON_SIDE = "POSITRON";
+
protected int febID;
protected int febHybridID;
protected double t0Shift = 0;
protected boolean isAxial = false;
protected boolean isStereo = false;
+ protected double readoutStripPitch = 0.060; // mm
+ protected double senseStripPitch = 0.030; // mm
+ private double readoutStripCapacitanceIntercept = 0;
+ private double readoutStripCapacitanceSlope = 0.16; // pf/mm
+ private double senseStripCapacitanceIntercept = 0;
+ private double senseStripCapacitanceSlope = 0.16; // pf/mm
+ private double readoutTransferEfficiency = 0.986;
+ private double senseTransferEfficiency = 0.419;
+
+ /*
+ * Adding separate strip capacitance for long detectors following
+ * S/N = mip_charge/(270e- + 36*C[pf/cm]*L[cm]
+ * e.g. for expected S/N=16 and L=20cm -> C=0.1708pf/mm
+ * e.g. for expected S/N=8 and L=20cm -> C=0.39pf/mm
+ * FIXME: This should be taken into account by the noise model.
+ */
+ protected double longSensorLengthThreshold = 190.0; //mm
+ protected double readoutLongStripCapacitanceSlope = 0.39; // pf/mm
+ protected double senseLongStripCapacitanceSlope = 0.39; // pf/mm
+
+
//-----------------------//
//--- Conditions Maps ---//
//-----------------------//
@@ -131,7 +165,7 @@
*
* @return True is sensor is stereo; false if not.
*/
- public boolean isStereo(){
+ public boolean isStereo() {
return isStereo;
}
@@ -263,7 +297,7 @@
*
* @return The side the sensor is on (ELECTRON or POSITRON)
*/
- public String getSide(){
+ public String getSide() {
return this.getModuleNumber() < 2 ? ELECTRON_SIDE : POSITRON_SIDE;
}
@@ -275,7 +309,7 @@
* @param channel : Physical channel number
* @return ID
*/
- public long makeChannelID(int channel){
+ public long makeChannelID(int channel) {
int sideNumber = this.hasElectrodesOnSide(ChargeCarrier.HOLE)
? ChargeCarrier.HOLE.charge() : ChargeCarrier.ELECTRON.charge();
return this.makeStripId(channel, sideNumber).getValue();
@@ -379,8 +413,7 @@
*
* @param true if the sensor is Axial, false otherwise
*/
- public void setAxial(boolean isAxial)
- {
+ public void setAxial(boolean isAxial) {
this.isAxial = isAxial;
}
@@ -389,7 +422,7 @@
*
* @param true is the sensor is stereo, false otherwise
*/
- public void setStereo(boolean isStereo){
+ public void setStereo(boolean isStereo) {
this.isStereo = isStereo;
}
@@ -398,7 +431,7 @@
* This does NOT reset the sensor setup information, which is
* assumed to be fixed once it is setup for a given session.
*/
- public void reset(){
+ public void reset() {
pedestalMap.clear();
noiseMap.clear();
offsetMap.clear();
@@ -409,7 +442,7 @@
}
@Override
- public String toString(){
+ public String toString() {
StringBuffer buffer = new StringBuffer();
buffer.append("HpsSiSensor: ");
@@ -423,4 +456,82 @@
return buffer.toString();
}
+ /**
+ * Setup the geometry and electrical characteristics of an
+ * {@link HpsSiSensor}
+ *
+ */
+ private void setupSensor() {
+
+ // Get the solid corresponding to the sensor volume
+ Box sensorSolid = (Box) this.getGeometry().getLogicalVolume().getSolid();
+
+ // Get the faces of the solid corresponding to the n and p sides of the sensor
+ Polygon3D pSide = sensorSolid.getFacesNormalTo(new BasicHep3Vector(0, 0, 1)).get(0);
+ Polygon3D nSide = sensorSolid.getFacesNormalTo(new BasicHep3Vector(0, 0, -1)).get(0);
+
+ // p side collects holes.
+ this.setBiasSurface(ChargeCarrier.HOLE, pSide);
+
+ // n side collects electrons.
+ this.setBiasSurface(ChargeCarrier.ELECTRON, nSide);
+
+ // Translate to the outside of the sensor solid in order to setup electrode
+ ITranslation3D electrodesPosition = new Translation3D(VecOp.mult(-pSide.getDistance(), pSide.getNormal()));
+
+ // Align the strips with the edge of the sensor.
+ IRotation3D electrodesRotation = new RotationPassiveXYZ(0, 0, 0);
+ Transform3D electrodesTransform = new Transform3D(electrodesPosition, electrodesRotation);
+
+ // Set the number of readout and sense electrodes.
+ SiStrips readoutElectrodes = new SiStrips(ChargeCarrier.HOLE, readoutStripPitch, this, electrodesTransform);
+ SiStrips senseElectrodes = new SiStrips(ChargeCarrier.HOLE, senseStripPitch, (readoutElectrodes.getNCells() * 2 - 1), this, electrodesTransform);
+
+ double readoutCapacitance = this.getStripLength() > longSensorLengthThreshold ? readoutLongStripCapacitanceSlope : readoutStripCapacitanceSlope;
+ double senseCapacitance = this.getStripLength() > longSensorLengthThreshold ? senseLongStripCapacitanceSlope : senseStripCapacitanceSlope;
+
+ // Set the strip capacitance.
+ readoutElectrodes.setCapacitanceIntercept(readoutStripCapacitanceIntercept);
+ readoutElectrodes.setCapacitanceSlope(readoutCapacitance);
+ senseElectrodes.setCapacitanceIntercept(senseStripCapacitanceIntercept);
+ senseElectrodes.setCapacitanceSlope(senseCapacitance);
+
+ // Set sense and readout electrodes.
+ this.setSenseElectrodes(senseElectrodes);
+ this.setReadoutElectrodes(readoutElectrodes);
+
+
+ // Set the charge transfer efficiency.
+ double[][] transferEfficiencies = {{readoutTransferEfficiency, senseTransferEfficiency}};
+ this.setTransferEfficiencies(ChargeCarrier.HOLE, new BasicMatrix(transferEfficiencies));
+
+ }
+
+ /**
+ * Return the length of an {@link HpsSiSensor}. This is done by getting
+ * the face of the {@link HpsSiSensor} and returning the length of the
+ * longest edge.
+ *
+ * @return The length of the longest {@link HpsSiSensor} edge
+ */
+ protected double getStripLength() {
+
+ double length = 0;
+
+ // Get the faces normal to the sensor
+ List<Polygon3D> faces = ((Box) this.getGeometry().getLogicalVolume().getSolid()).getFacesNormalTo(new BasicHep3Vector(0,0,1));
+ for (Polygon3D face : faces) {
+
+ // Loop through the edges of the sensor face and find the longest
+ // one
+ List<LineSegment3D> edges = face.getEdges();
+ for (LineSegment3D edge : edges) {
+ if (edge.getLength() > length) {
+ length = edge.getLength();
+ }
+ }
+ }
+ return length;
+ }
+
}
########################################################################
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