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Fixed propagation procedure

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This commit is contained in:
darksnake 2016-06-14 16:48:47 +03:00
parent 38f26f93c5
commit 5b6f642c56
6 changed files with 136 additions and 90 deletions
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4
build.gradle
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@ -17,6 +17,10 @@ tasks.withType(JavaCompile) {
options.encoding = 'UTF-8'
}
tasks.withType(JavaExec){
enableAssertions = true
}
repositories {
mavenCentral()
}

BIN
gradle/wrapper/gradle-wrapper.jar vendored
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4
gradle/wrapper/gradle-wrapper.properties vendored
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@ -1,6 +1,6 @@
#Sun May 08 12:57:40 MSK 2016
#Tue Jun 14 13:15:55 MSK 2016
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-2.13-bin.zip
distributionUrl=https\://services.gradle.org/distributions/gradle-2.14-bin.zip

3
src/main/java/inr/numass/trapping/SimulationManager.java
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@ -108,6 +108,7 @@ public class SimulationManager {
Counter counter = new Counter();
Predicate<Simulator.SimulationResult> reportIf = (res) -> res.state == Simulator.EndState.ACCEPTED;
System.out.printf("%nStarting sumulation with initial energy %g and %d electrons.%n%n", initialE, num);
output.printf("%s\t%s\t%s\t%s\t%s\t%s%n", "E", "theta", "theta_start", "colNum", "L", "state");
Stream.generate(() -> getRandomTheta()).limit(num).parallel()
.forEach((theta) -> {
double initZ = (generator.nextDouble() - 0.5) * Simulator.SOURCE_LENGTH;
@ -144,7 +145,7 @@ public class SimulationManager {
}
private void printOne(PrintStream out, Simulator.SimulationResult res) {
out.printf("%g\t%g\t%g\t%d\t%s%n", res.E, res.theta * 180 / Math.PI, res.initTheta * 180 / Math.PI, res.collisionNumber, res.state.toString());
out.printf("%g\t%g\t%g\t%d\t%g\t%s%n", res.E, res.theta * 180 / Math.PI, res.initTheta * 180 / Math.PI, res.collisionNumber, res.l, res.state.toString());
}

211
src/main/java/inr/numass/trapping/Simulator.java
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@ -45,7 +45,7 @@ public class Simulator {
setELow(Elow);
}
public static enum EndState {
public enum EndState {
ACCEPTED,//трэппинговый электрон попал в аксептанс
REJECTED,//трэппинговый электрон вылетел через заднюю пробку
@ -64,14 +64,30 @@ public class Simulator {
this.thetaPinch = Math.asin(Math.sqrt(Bsource / Bpinch));
}
/**
* Set gas density in 1/m^3
*
* @param gasDensity
*/
public void setGasDensity(double gasDensity) {
this.gasDensity = gasDensity;
}
/**
* Longitudal magnetic field distribution
*
* @param magneticField
*/
public void setFieldFunc(UnivariateFunction magneticField) {
this.magneticField = magneticField;
}
/**
* Perform scattering in the given position
*
* @param pos
* @return
*/
private State scatter(State pos) {
//Вычисляем сечения и нормируем их на полное сечение
double sigmaIon = scatter.sigmaion(pos.e);
@ -116,13 +132,13 @@ public class Simulator {
* @return
*/
private double freePath(double e) {
//FIXME double cross-section calculation
//FIXME redundant cross-section calculation
//All cross-sections are in m^2
return new ExponentialDistribution(generator, 1 / scatter.sigmaTotal(e) / gasDensity).sample();
return new ExponentialDistribution(generator, 1d / scatter.sigmaTotal(e) / gasDensity).sample();
}
/**
* Calculate propagated position
* Calculate propagated position before scattering
*
* @param deltaL
* @return z shift and reflection counter
@ -131,23 +147,27 @@ public class Simulator {
// if magnetic field not defined, consider it to be uniform and equal bSource
if (magneticField == null) {
double deltaZ = deltaL * cos(pos.theta); // direction already included in cos(theta)
double z0 = pos.z;
pos.addZ(deltaZ);
pos.l += abs(pos.z - z0) / cos(pos.theta);
//if we are crossing source boundary, check for end condition
if(abs(deltaZ + pos.z)>SOURCE_LENGTH/2d) {
checkEndState(pos);
}
// if track is finished apply boundary position
if (pos.isFinished()) {
// remembering old z to correctly calculate total l
double oldz = pos.z;
pos.z = pos.direction() * SOURCE_LENGTH / 2d;
pos.l += (pos.z - oldz)/cos(pos.theta);
} else {
//else just add z
pos.l += deltaL;
pos.addZ(deltaZ);
}
// //if we are crossing source boundary, check for end condition
// while (abs(deltaZ + pos.z) > SOURCE_LENGTH / 2d && !pos.isFinished()) {
//
// pos.checkEndState();
// }
//
// // if track is finished apply boundary position
// if (pos.isFinished()) {
// // remembering old z to correctly calculate total l
// double oldz = pos.z;
// pos.z = pos.direction() * SOURCE_LENGTH / 2d;
// pos.l += (pos.z - oldz) / cos(pos.theta);
// } else {
// //else just add z
// pos.l += deltaL;
// pos.addZ(deltaZ);
// }
return pos;
} else {
@ -161,31 +181,45 @@ public class Simulator {
double b = field(pos.z);
double root = 1 - sin2 * b / bSource;
// change direction in case of reflection. Loss of precision here?
//preliminary reflection
if (root < 0) {
//flip direction
pos.flip();
// check if end state occured
checkEndState(pos);
// finish if it does
if(pos.isFinished()){
return pos;
} else {
// move in reversed direction
pos.z += pos.direction() * delta * sqrt(-root);
}
} else {
// move
pos.z += pos.direction() * delta * sqrt(root);
}
pos.addZ(pos.direction() * delta * sqrt(abs(root)));
// // change direction in case of reflection. Loss of precision here?
// if (root < 0) {
// // check if end state occurred. seem to never happen since it is reflection case
// pos.checkEndState();
// // finish if it does
// if (pos.isFinished()) {
// //TODO check if it happens
// return pos;
// } else {
// //flip direction
// pos.flip();
// // move in reversed direction
// pos.z += pos.direction() * delta * sqrt(-root);
// }
//
// } else {
// // move forward
// pos.z += pos.direction() * delta * sqrt(root);
// //check if it is exit case
// if (abs(pos.z) > SOURCE_LENGTH / 2d) {
// // check if electron is out
// pos.checkEndState();
// // finish if it is
// if (pos.isFinished()) {
// return pos;
// }
// // PENDING no need to apply reflection, it is applied automatically when root < 0
// pos.z = signum(pos.z) * SOURCE_LENGTH / 2d;
// if (signum(pos.z) == pos.direction()) {
// pos.flip();
// }
// }
// }
//normalize in case reflection is beyound the source
if (abs(pos.z) > SOURCE_LENGTH / 2d) {
pos.z = signum(pos.z) * SOURCE_LENGTH / 2d;
if(signum(pos.z)== pos.direction()){
pos.flip();
}
}
curL += delta;
pos.l += delta;
@ -194,30 +228,6 @@ public class Simulator {
}
}
/**
* Check if this position is an end state and apply it if necessary
*
* @param pos
* @return
*/
private State checkEndState(State pos) {
//accepted by spectrometer
if (pos.theta < thetaPinch) {
if (pos.colNum == 0) {
//counting pass electrons
pos.setEndState(EndState.PASS);
} else {
pos.setEndState(EndState.ACCEPTED);
}
}
//through the rear magnetic pinch
if (pos.theta >= PI - thetaTransport) {
pos.setEndState(EndState.REJECTED);
}
return pos;
}
/**
* Magnetic field in the z point
*
@ -246,11 +256,12 @@ public class Simulator {
while (!pos.isFinished()) {
double dl = freePath(pos.e); // path to next scattering
// propagate to next scattering position
propagate(pos,dl);
propagate(pos, dl);
if (!pos.isFinished()) {
// perform scatter
scatter(pos);
// increase collision number
pos.colNum++;
if (pos.e < eLow) {
//Если энергия стала слишком маленькой
@ -363,20 +374,53 @@ public class Simulator {
*/
double addZ(double dZ) {
this.z += dZ;
while (abs(this.z) > SOURCE_LENGTH / 2d) {
while (abs(this.z) > SOURCE_LENGTH / 2d && !isFinished()) {
checkEndState();
if (!isFinished()) {
flip();
}
// reflecting from back wall
if (z < 0) {
// reflecting from rear pinch
z = -SOURCE_LENGTH - z;
if (isFinished()) {
z = -SOURCE_LENGTH / 2d;
} else {
// reflecting from rear pinch
z = -SOURCE_LENGTH - z;
}
} else {
// reflecting from forward transport magnet
z = SOURCE_LENGTH - z;
if (isFinished()) {
z = SOURCE_LENGTH / 2d;
} else {
// reflecting from forward transport magnet
z = SOURCE_LENGTH - z;
}
}
flip();
}
return z;
}
/**
* Check if this position is an end state and apply it if necessary. Does not check z position.
*
* @return
*/
private void checkEndState() {
//accepted by spectrometer
if (theta < thetaPinch) {
if (colNum == 0) {
//counting pass electrons
setEndState(EndState.PASS);
} else {
setEndState(EndState.ACCEPTED);
}
}
//through the rear magnetic pinch
if (theta >= PI - thetaTransport) {
setEndState(EndState.REJECTED);
}
}
/**
* Reverse electron direction
*/
@ -406,9 +450,8 @@ public class Simulator {
if (theta > PI / 2) {
newTheta = PI - newTheta;
}
if (Double.isNaN(newTheta)) {
throw new Error();
}
assert !Double.isNaN(newTheta);
return newTheta;
}
}
@ -437,13 +480,13 @@ public class Simulator {
double newtheta = acos(result.getZ());
//следим чтобы угол был от 0 до Pi
if (newtheta < 0) {
newtheta = -newtheta;
}
if (newtheta > Math.PI) {
newtheta = 2 * Math.PI - newtheta;
}
// //следим чтобы угол был от 0 до Pi
// if (newtheta < 0) {
// newtheta = -newtheta;
// }
// if (newtheta > Math.PI) {
// newtheta = 2 * Math.PI - newtheta;
// }
//change back to virtual angles
if (magneticField == null) {
@ -455,9 +498,7 @@ public class Simulator {
}
}
if (Double.isNaN(theta)) {
throw new Error();
}
assert !Double.isNaN(theta);
return theta;
}

4
src/main/java/inr/numass/trapping/Trapping.java
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@ -16,10 +16,10 @@ public class Trapping {
System.out.printf("Starting at %s%n%n", startTime.toString());
new SimulationManager()
.withParameters(0.6, 3.7, 4.84, 18000d, 4000)
// .withOutputFile("D:\\Work\\Numass\\trapping\\trap 18, pinch 100A, fields.out")
.withOutputFile("D:\\Work\\Numass\\trapping\\trap 18, pinch 100A.out")
// .withFieldMap(z, b)
// .withDensity(5e20)
.simulateAll((int) 1e4);
.simulateAll((int) 1e6);
Instant finishTime = Instant.now();
System.out.printf("%nFinished at %s%n", finishTime.toString());
System.out.printf("Calculation took %s%n", Duration.between(startTime,finishTime).toString());