/**
* Scale the field by beta-gamma to preserve the magnet's influence on the beam.
*
* @param kineticEnergy
* @param designKineticEnergy
* @param restEnergy
*/
public void preserveDesignInfluence(
final double kineticEnergy, final double designKineticEnergy, final double restEnergy) {
final double energy = kineticEnergy + restEnergy;
final double designEnergy = designKineticEnergy + restEnergy;
final double betaGamma = Math.sqrt(Math.pow(energy / restEnergy, 2) - 1.0);
final double designBetaGamma = Math.sqrt(Math.pow(designEnergy / restEnergy, 2) - 1.0);
final LiveParameter fieldParameter = getLiveParameter(FIELD_INDEX);
final double designField = fieldParameter.getDesignValue();
fieldParameter.setCustomValue(designField * betaGamma / designBetaGamma);
}
/** handle the get value callback */
public void eventValue(final ChannelRecord record, final Channel channel) {
synchronized (this) {
if (channel == _lowerChannel) {
_rawLowerFieldLimit = record.doubleValue();
} else if (channel == _upperChannel) {
_rawUpperFieldLimit = record.doubleValue();
}
if (hasLimits()) {
_fieldLimits[0] = Math.min(_rawLowerFieldLimit, _rawUpperFieldLimit);
_fieldLimits[1] = Math.max(_rawLowerFieldLimit, _rawUpperFieldLimit);
EVENT_PROXY.fieldLimitsChanged(CorrectorSupply.this, _fieldLimits[0], _fieldLimits[1]);
}
}
}
/** Set the custom field limits as a fraction of the operational limits */
public void setOperationalFieldLimitsFraction(final double fraction) {
final double operationalLowerLimit = getHardLowerFieldLimit();
final double operationalUpperLimit = getHardUpperFieldLimit();
// verify that both operational limits are valid
if (!Double.isNaN(operationalLowerLimit) && !Double.isNaN(operationalUpperLimit)) {
if (fraction == 1.0) { // if 100% indicate that the limits are no longer custom
_lowerFieldLimit = Double.NaN;
_upperFieldLimit = Double.NaN;
} else {
final double halfRange =
fraction * Math.abs(operationalUpperLimit - operationalLowerLimit) / 2;
final double operationalMean = (operationalUpperLimit + operationalLowerLimit) / 2;
final double lowerLimit = operationalMean - halfRange;
final double upperLimit = operationalMean + halfRange;
setLowerFieldLimit(lowerLimit);
setUpperFieldLimit(upperLimit);
}
}
}