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fix: reduce cosine calculations in DC TableLoader #1237

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Merged
c-dilks merged 1 commit into from
May 4, 2026
Merged

fix: reduce cosine calculations in DC TableLoader #1237

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11 changes: 4 additions & 7 deletions reconstruction/dc/src/main/java/org/jlab/rec/dc/timetodistance/TableLoader.java
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Original file line number Diff line number Diff line change
Expand Up @@ -229,18 +229,15 @@ private static int getAlphaBin(double Alpha) {
}

private static synchronized void FillAlpha() {
final double cos30 = Math.cos(Math.toRadians(30.));
for(int icosalpha =0; icosalpha<maxBinIdxAlpha+1; icosalpha++) {

double cos30minusalphaM = Math.cos(Math.toRadians(30.)) + (double)
(icosalpha)*(1. - Math.cos(Math.toRadians(30.)))/5.;
double cos30minusalphaM = cos30 + (double) (icosalpha)*(1. - cos30)/5.;
double alphaM = -(Math.toDegrees(Math.acos(cos30minusalphaM)) - 30);
AlphaMid[icosalpha]= alphaM;
double cos30minusalphaU = Math.cos(Math.toRadians(30.)) + (double)
(icosalpha+0.5)*(1. - Math.cos(Math.toRadians(30.)))/5.;
double cos30minusalphaU = cos30 + (double) (icosalpha+0.5)*(1. - cos30)/5.;
double alphaU = -(Math.toDegrees(Math.acos(cos30minusalphaU)) - 30);
AlphaBounds[icosalpha][1] = alphaU;
double cos30minusalphaL = Math.cos(Math.toRadians(30.)) + (double)
(icosalpha-0.5)*(1. - Math.cos(Math.toRadians(30.)))/5.;
double cos30minusalphaL = cos30 + (double) (icosalpha-0.5)*(1. - cos30)/5.;
double alphaL = -(Math.toDegrees(Math.acos(cos30minusalphaL)) - 30);
AlphaBounds[icosalpha][0] = alphaL;
}
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