110 lines
3.6 KiB
Java
110 lines
3.6 KiB
Java
/*
|
|
* 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.tables.DataPoint;
|
|
import hep.dataforge.tables.ListTable;
|
|
import hep.dataforge.tables.Table;
|
|
import inr.numass.data.SpectrumDataAdapter;
|
|
import static java.lang.Math.abs;
|
|
import static java.lang.Math.exp;
|
|
import static java.lang.Math.sqrt;
|
|
import org.apache.commons.math3.analysis.UnivariateFunction;
|
|
|
|
/**
|
|
*
|
|
* @author Darksnake
|
|
*/
|
|
public class TritiumUtils {
|
|
|
|
|
|
public static Table correctForDeadTime(ListTable data, double dtime) {
|
|
return correctForDeadTime(data, adapter(), dtime);
|
|
}
|
|
|
|
/**
|
|
* Коррекция на мертвое время в секундах
|
|
*
|
|
* @param data
|
|
* @param dtime
|
|
* @return
|
|
*/
|
|
public static Table correctForDeadTime(ListTable data, SpectrumDataAdapter adapter, double dtime) {
|
|
// SpectrumDataAdapter adapter = adapter();
|
|
ListTable.Builder res = new ListTable.Builder(data.getFormat());
|
|
for (DataPoint dp : data) {
|
|
double corrFactor = 1 / (1 - dtime * adapter.getCount(dp) / adapter.getTime(dp));
|
|
res.addRow(adapter.buildSpectrumDataPoint(adapter.getX(dp).doubleValue(), (long) (adapter.getCount(dp) * corrFactor), adapter.getTime(dp)));
|
|
}
|
|
return res.build();
|
|
}
|
|
|
|
/**
|
|
* Поправка масштаба высокого.
|
|
*
|
|
* @param data
|
|
* @param beta
|
|
* @return
|
|
*/
|
|
public static Table setHVScale(ListTable data, double beta) {
|
|
SpectrumDataAdapter reader = adapter();
|
|
ListTable.Builder res = new ListTable.Builder(data.getFormat());
|
|
for (DataPoint dp : data) {
|
|
double corrFactor = 1 + beta;
|
|
res.addRow(reader.buildSpectrumDataPoint(reader.getX(dp).doubleValue() * corrFactor, reader.getCount(dp), reader.getTime(dp)));
|
|
}
|
|
return res.build();
|
|
}
|
|
|
|
public static SpectrumDataAdapter adapter() {
|
|
return new SpectrumDataAdapter("Uset", "CR", "CRerr", "Time");
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
}
|