Author: [log in to unmask]
Date: Thu Jul 23 07:50:29 2015
New Revision: 3274
Log:
time walk correction for pulse fitting
Modified:
java/trunk/ecal-recon/src/main/java/org/hps/recon/ecal/EcalTimeWalk.java
Modified: java/trunk/ecal-recon/src/main/java/org/hps/recon/ecal/EcalTimeWalk.java
=============================================================================
--- java/trunk/ecal-recon/src/main/java/org/hps/recon/ecal/EcalTimeWalk.java (original)
+++ java/trunk/ecal-recon/src/main/java/org/hps/recon/ecal/EcalTimeWalk.java Thu Jul 23 07:50:29 2015
@@ -34,5 +34,34 @@
pars[5] * Math.pow(energy, 4);
return time - poly1 * Math.exp(-poly2);
}
+
+ /*
+ * Time walk parameters for pulse fitting
+ */
+ private static final double[] par = {
+ 0.9509,
+ -33.21,
+ 0.2614,
+ -0.9128,
+ 0.6251
+ };
+
+ /**
+ * Perform Time Walk Correction for Mode 1 hits using pulse fitting
+ * @param time - FADC Mode 1 hit time from pulse fitting (ns)
+ * @param energy - Pulse energy from pulse fitting (GeV)
+ * @return corrected time (ns)
+ */
+ public static final double correctTimeWalkPulseFitting(double time, double energy) {
+ final double polyA = par[0] + par[1]*energy;
+ final double polyB = par[2] + par[3] * energy + par[4] * Math.pow(energy, 2);
+ return time - (Math.exp(polyA) + polyB);
+ }
+
+
+
+
+
+
}
