numass-framework/numass-main/src/main/java/inr/numass/utils/TritiumUtils.java

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2015-12-18 16:20:47 +03:00
/*
* Copyright 2015 Alexander Nozik.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package inr.numass.utils;
import hep.dataforge.data.DataPoint;
import hep.dataforge.data.ListDataSet;
import inr.numass.data.SpectrumDataAdapter;
import static java.lang.Math.exp;
import static java.lang.Math.sqrt;
import org.apache.commons.math3.analysis.UnivariateFunction;
import static java.lang.Math.abs;
import static java.lang.Math.abs;
/**
*
* @author Darksnake
*/
public class TritiumUtils {
// /**
// * Линейное уплывание интенсивности в зависимости от времени. Размерность:
// * обратные секунды
// *
// * @param data
// * @param driftPerSecond
// * @return
// */
// public static ListDataSet applyDrift(ListDataSet data, double driftPerSecond) {
// double t = 0;
//
// ListDataSet res = new ListDataSet(data.getDataFormat());
// for (DataPoint d : data) {
// SpectrumDataPoint dp = (SpectrumDataPoint) d;
// double corrFactor = 1 + driftPerSecond * t;
// dp = new SpectrumDataPoint(dp.getX(), (long) (dp.getCount() * corrFactor), dp.getTime());
// res.add(dp);
// t += dp.getTime();
// }
// return res;
//
// }
/**
* Коррекция на мертвое время в секундах
*
* @param data
* @param dtime
* @return
*/
public static ListDataSet correctForDeadTime(ListDataSet data, double dtime) {
SpectrumDataAdapter reader = new SpectrumDataAdapter(data.meta().getNode("aliases"));
ListDataSet res = new ListDataSet(data.getDataFormat());
for (DataPoint dp : data) {
double corrFactor = 1 / (1 - dtime * reader.getCount(dp) /reader.getTime(dp));
res.add(reader.buildSpectrumDataPoint(reader.getX(dp).doubleValue(), (long) (reader.getCount(dp)*corrFactor),reader.getTime(dp)));
}
return res;
}
/**
* Поправка масштаба высокого.
*
* @param data
* @param beta
* @return
*/
public static ListDataSet setHVScale(ListDataSet data, double beta) {
SpectrumDataAdapter reader = new SpectrumDataAdapter(data.meta().getNode("aliases"));
ListDataSet res = new ListDataSet(data.getDataFormat());
for (DataPoint dp : data) {
double corrFactor = 1 + beta;
res.add(reader.buildSpectrumDataPoint(reader.getX(dp).doubleValue()*corrFactor, reader.getCount(dp), reader.getTime(dp)));
}
return res;
}
/**
* Integral beta spectrum background with given amplitude (total count rate
* from)
*
* @param energy
* @param countRate
* @return
*/
public static UnivariateFunction tritiumBackgroundFunction(double amplitude) {
return (e) -> {
/*чистый бета-спектр*/
double e0 = 18575d;
double D = e0 - e;//E0-E
if (D <= 0) {
return 0;
}
return amplitude * factor(e) * D * D;
};
}
private static double factor(double E) {
double me = 0.511006E6;
double Etot = E + me;
double pe = sqrt(E * (E + 2d * me));
double ve = pe / Etot;
double yfactor = 2d * 2d * 1d / 137.039 * Math.PI;
double y = yfactor / ve;
double Fn = y / abs(1d - exp(-y));
double Fermi = Fn * (1.002037 - 0.001427 * ve);
double res = Fermi * pe * Etot;
return res * 1E-23;
}
}