/***********************************************************************//** * @brief Simulate background events from model * * @param[in] obs Pointer on CTA observation. * @param[in] models Models. * @param[in] ran Random number generator. * @param[in] wrklog Pointer to logger. * * Simulate background events from models. The events are stored as event * list in the observation. * * This method does nothing if the observation pointer is NULL. ***************************************************************************/ void ctobssim::simulate_background(GCTAObservation* obs, const GModels& models, GRan& ran, GLog* wrklog) { // Continue only if observation pointer is valid if (obs != NULL) { // If no logger is specified then use the default logger if (wrklog == NULL) { wrklog = &log; } // Get pointer on event list (circumvent const correctness) GCTAEventList* events = static_cast<GCTAEventList*>(const_cast<GEvents*>(obs->events())); // Loop over all models for (int i = 0; i < models.size(); ++i) { // Get data model (NULL if not a data model) const GModelData* model = dynamic_cast<const GModelData*>(models[i]); // If we have a data model that applies to the present observation // then simulate events if (model != NULL && model->is_valid(obs->instrument(), obs->id())) { // Get simulated CTA event list. Note that this method // includes the deadtime correction. GCTAEventList* list = dynamic_cast<GCTAEventList*>(model->mc(*obs, ran)); // Continue only if we got a CTA event list if (list != NULL) { // Reserves space for events events->reserve(list->size()+events->size()); // Append events for (int k = 0; k < list->size(); k++) { // Get event pointer GCTAEventAtom* event = (*list)[k]; // Use event only if it falls within ROI if (events->roi().contains(*event)) { // Set event identifier event->event_id(m_event_id); m_event_id++; // Append event events->append(*event); } // endif: event was within ROI } // endfor: looped over all events // Dump simulation results if (logNormal()) { *wrklog << gammalib::parformat("MC background events"); *wrklog << list->size() << std::endl; } // Free event list delete list; } // endif: we had a CTA event list } // endif: model was valid } // endfor: looped over all models } // endif: observation pointer was valid // Return return; }
/***********************************************************************//** * @brief Simulate source events from photon list * * @param[in] obs Pointer on CTA observation. * @param[in] models Model list. * @param[in] ran Random number generator. * @param[in] wrklog Pointer to logger. * * Simulate source events from a photon list for a given CTA observation. * The events are stored in as event list in the observation. * * This method does nothing if the observation pointer is NULL. It also * verifies if the observation has a valid pointing and response. ***************************************************************************/ void ctobssim::simulate_source(GCTAObservation* obs, const GModels& models, GRan& ran, GLog* wrklog) { // Continue only if observation pointer is valid if (obs != NULL) { // If no logger is specified then use the default logger if (wrklog == NULL) { wrklog = &log; } // Get CTA response const GCTAResponseIrf* rsp = dynamic_cast<const GCTAResponseIrf*>(obs->response()); if (rsp == NULL) { std::string msg = "Response is not an IRF response.\n" + obs->response()->print(); throw GException::invalid_value(G_SIMULATE_SOURCE, msg); } // Get pointer on event list (circumvent const correctness) GCTAEventList* events = static_cast<GCTAEventList*>(const_cast<GEvents*>(obs->events())); // Extract simulation region. GSkyDir dir = events->roi().centre().dir(); double rad = events->roi().radius() + g_roi_margin; // Dump simulation cone information if (logNormal()) { *wrklog << gammalib::parformat("Simulation area"); *wrklog << m_area << " cm2" << std::endl; *wrklog << gammalib::parformat("Simulation cone"); *wrklog << "RA=" << dir.ra_deg() << " deg"; *wrklog << ", Dec=" << dir.dec_deg() << " deg"; *wrklog << ", r=" << rad << " deg" << std::endl; } // Initialise indentation for logging int indent = 0; // Loop over all Good Time Intervals for (int it = 0; it < events->gti().size(); ++it) { // Extract time interval GTime tmin = events->gti().tstart(it); GTime tmax = events->gti().tstop(it); // Dump time interval if (logNormal()) { if (events->gti().size() > 1) { indent++; wrklog->indent(indent); } *wrklog << gammalib::parformat("Time interval", indent); *wrklog << tmin.convert(m_cta_ref); *wrklog << " - "; *wrklog << tmax.convert(m_cta_ref); *wrklog << " s" << std::endl; } // Loop over all energy boundaries for (int ie = 0; ie < events->ebounds().size(); ++ie) { // Extract energy boundaries GEnergy emin = events->ebounds().emin(ie); GEnergy emax = events->ebounds().emax(ie); // Set true photon energy limits for simulation. If observation // has energy dispersion then add margin GEnergy e_true_min = emin; GEnergy e_true_max = emax; if (rsp->use_edisp()) { e_true_min = rsp->ebounds(e_true_min).emin(); e_true_max = rsp->ebounds(e_true_max).emax(); } // Dump energy range if (logNormal()) { if (events->ebounds().size() > 1) { indent++; wrklog->indent(indent); } *wrklog << gammalib::parformat("Photon energy range", indent); *wrklog << e_true_min << " - " << e_true_max << std::endl; *wrklog << gammalib::parformat("Event energy range", indent); *wrklog << emin << " - " << emax << std::endl; } // Loop over all sky models for (int i = 0; i < models.size(); ++i) { // Get sky model (NULL if not a sky model) const GModelSky* model = dynamic_cast<const GModelSky*>(models[i]); // If we have a sky model that applies to the present // observation then simulate events if (model != NULL && model->is_valid(obs->instrument(), obs->id())) { // Determine duration of a time slice by limiting the // number of simulated photons to m_max_photons. // The photon rate is estimated from the model flux // and used to set the duration of the time slice. double flux = get_model_flux(model, emin, emax, dir, rad); double rate = flux * m_area; double duration = 1800.0; // default: 1800 sec if (rate > 0.0) { duration = m_max_photons / rate; if (duration < 1.0) { // not <1 sec duration = 1.0; } else if (duration > 180000.0) { // not >50 hr duration = 180000.0; } } GTime tslice(duration, "sec"); // If photon rate exceeds the maximum photon rate // then throw an exception if (rate > m_max_rate) { std::string modnam = (model->name().length() > 0) ? model->name() : "Unknown"; std::string msg = "Photon rate "+ gammalib::str(rate)+ " photons/sec for model \""+ modnam+"\" exceeds maximum" " allowed photon rate of "+ gammalib::str(m_max_rate)+ " photons/sec. Please check" " the model parameters for" " model \""+modnam+"\" or" " increase the value of the" " hidden \"maxrate\"" " parameter."; throw GException::invalid_value(G_SIMULATE_SOURCE, msg); } // Dump length of time slice and rate if (logExplicit()) { *wrklog << gammalib::parformat("Photon rate", indent); *wrklog << rate << " photons/sec"; if (model->name().length() > 0) { *wrklog << " [" << model->name() << "]"; } *wrklog << std::endl; } // To reduce memory requirements we split long time // intervals into several slices. GTime tstart = tmin; GTime tstop = tstart + tslice; // Initialise cumulative photon counters int nphotons = 0; // Loop over time slices while (tstart < tmax) { // Make sure that tstop <= tmax if (tstop > tmax) { tstop = tmax; } // Dump time slice if (logExplicit()) { if (tmax - tmin > tslice) { indent++; wrklog->indent(indent); } *wrklog << gammalib::parformat("Time slice", indent); *wrklog << tstart.convert(m_cta_ref); *wrklog << " - "; *wrklog << tstop.convert(m_cta_ref); *wrklog << " s"; if (model->name().length() > 0) { *wrklog << " [" << model->name() << "]"; } *wrklog << std::endl; } // Get photons GPhotons photons = model->mc(m_area, dir, rad, e_true_min, e_true_max, tstart, tstop, ran); // Dump number of simulated photons if (logExplicit()) { *wrklog << gammalib::parformat("MC source photons/slice", indent); *wrklog << photons.size(); if (model->name().length() > 0) { *wrklog << " [" << model->name() << "]"; } *wrklog << std::endl; } // Simulate events from photons for (int i = 0; i < photons.size(); ++i) { // Increment photon counter nphotons++; // Simulate event. Note that this method // includes the deadtime correction. GCTAEventAtom* event = rsp->mc(m_area, photons[i], *obs, ran); if (event != NULL) { // Use event only if it falls within ROI // energy boundary and time slice if (events->roi().contains(*event) && event->energy() >= emin && event->energy() <= emax && event->time() >= tstart && event->time() <= tstop) { event->event_id(m_event_id); events->append(*event); m_event_id++; } delete event; } } // endfor: looped over events // Go to next time slice tstart = tstop; tstop = tstart + tslice; // Reset indentation if (logExplicit()) { if (tmax - tmin > tslice) { indent--; wrklog->indent(indent); } } } // endwhile: looped over time slices // Dump simulation results if (logNormal()) { *wrklog << gammalib::parformat("MC source photons", indent); *wrklog << nphotons; if (model->name().length() > 0) { *wrklog << " [" << model->name() << "]"; } *wrklog << std::endl; *wrklog << gammalib::parformat("MC source events", indent); *wrklog << events->size(); if (model->name().length() > 0) { *wrklog << " [" << model->name() << "]"; } *wrklog << std::endl; } } // endif: model was a sky model } // endfor: looped over models // Dump simulation results if (logNormal()) { *wrklog << gammalib::parformat("MC source events", indent); *wrklog << events->size(); *wrklog << " (all source models)"; *wrklog << std::endl; } // Reset indentation if (logNormal()) { if (events->ebounds().size() > 1) { indent--; wrklog->indent(indent); } } } // endfor: looped over all energy boundaries // Reset indentation if (logNormal()) { if (events->gti().size() > 1) { indent--; wrklog->indent(indent); } } } // endfor: looped over all time intervals // Reset indentation wrklog->indent(0); } // endif: observation pointer was valid // Return return; }
/***********************************************************************//** * @brief Simulate source events from photon list * * @param[in] obs Pointer on CTA observation. * @param[in] models Model list. * @param[in] ran Random number generator. * @param[in] wrklog Pointer to logger. * * Simulate source events from a photon list for a given CTA observation. * The events are stored in as event list in the observation. * * This method does nothing if the observation pointer is NULL. It also * verifies if the observation has a valid pointing and response. ***************************************************************************/ void ctobssim::simulate_source(GCTAObservation* obs, const GModels& models, GRan& ran, GLog* wrklog) { // Continue only if observation pointer is valid if (obs != NULL) { // If no logger is specified then use the default logger if (wrklog == NULL) { wrklog = &log; } // Get pointer on CTA response. Throw an exception if the response // is not defined. const GCTAResponse& rsp = obs->response(); // Make sure that the observation holds a CTA event list. If this // is not the case then allocate and attach a CTA event list now. if (dynamic_cast<const GCTAEventList*>(obs->events()) == NULL) { set_list(obs); } // Get pointer on event list (circumvent const correctness) GCTAEventList* events = static_cast<GCTAEventList*>(const_cast<GEvents*>(obs->events())); // Extract simulation region. GSkyDir dir = events->roi().centre().dir(); double rad = events->roi().radius() + g_roi_margin; // Dump simulation cone information if (logNormal()) { *wrklog << gammalib::parformat("Simulation area"); *wrklog << m_area << " cm2" << std::endl; *wrklog << gammalib::parformat("Simulation cone"); *wrklog << "RA=" << dir.ra_deg() << " deg"; *wrklog << ", Dec=" << dir.dec_deg() << " deg"; *wrklog << ", r=" << rad << " deg" << std::endl; } // Initialise indentation for logging int indent = 0; // Loop over all Good Time Intervals for (int it = 0; it < events->gti().size(); ++it) { // Extract time interval GTime tmin = events->gti().tstart(it); GTime tmax = events->gti().tstop(it); // Dump time interval if (logNormal()) { if (events->gti().size() > 1) { indent++; wrklog->indent(indent); } *wrklog << gammalib::parformat("Time interval", indent); *wrklog << tmin.convert(m_cta_ref); *wrklog << " - "; *wrklog << tmax.convert(m_cta_ref); *wrklog << " s" << std::endl; } // Loop over all energy boundaries for (int ie = 0; ie < events->ebounds().size(); ++ie) { // Extract energy boundaries GEnergy emin = events->ebounds().emin(ie); GEnergy emax = events->ebounds().emax(ie); // Dump energy range if (logNormal()) { if (events->ebounds().size() > 1) { indent++; wrklog->indent(indent); } *wrklog << gammalib::parformat("Energy range", indent); *wrklog << emin << " - " << emax << std::endl; } // Loop over all sky models for (int i = 0; i < models.size(); ++i) { // Get sky model (NULL if not a sky model) const GModelSky* model = dynamic_cast<const GModelSky*>(models[i]); // If we have a sky model that applies to the present // observation then simulate events if (model != NULL && model->is_valid(obs->instrument(), obs->id())) { // Determine duration of a time slice by limiting the // number of simulated photons to m_max_photons. // The photon rate is estimated from the model flux // and used to set the duration of the time slice. double flux = model->spectral()->flux(emin, emax); double rate = flux * m_area; double duration = 1800.0; // default: 1800 sec if (rate > 0.0) { duration = m_max_photons / rate; if (duration < 1.0) { // not <1 sec duration = 1.0; } else if (duration > 180000.0) { // not >50 hr duration = 180000.0; } } GTime tslice(duration, "sec"); // To reduce memory requirements we split long time // intervals into several slices. GTime tstart = tmin; GTime tstop = tstart + tslice; // Initialise cumulative photon counters int nphotons = 0; // Loop over time slices while (tstart < tmax) { // Make sure that tstop <= tmax if (tstop > tmax) { tstop = tmax; } // Dump time slice if (logExplicit()) { if (tmax - tmin > tslice) { indent++; wrklog->indent(indent); } *wrklog << gammalib::parformat("Time slice", indent); *wrklog << tstart.convert(m_cta_ref); *wrklog << " - "; *wrklog << tstop.convert(m_cta_ref); *wrklog << " s" << std::endl; } // Get photons GPhotons photons = model->mc(m_area, dir, rad, emin, emax, tstart, tstop, ran); // Dump number of simulated photons if (logExplicit()) { *wrklog << gammalib::parformat("MC source photons/slice", indent); *wrklog << photons.size(); if (model->name().length() > 0) { *wrklog << " [" << model->name() << "]"; } *wrklog << std::endl; } // Simulate events from photons for (int i = 0; i < photons.size(); ++i) { // Increment photon counter nphotons++; // Simulate event. Note that this method // includes the deadtime correction. GCTAEventAtom* event = rsp.mc(m_area, photons[i], *obs, ran); if (event != NULL) { // Use event only if it falls within ROI if (events->roi().contains(*event)) { event->event_id(m_event_id); events->append(*event); m_event_id++; } delete event; } } // endfor: looped over events // Go to next time slice tstart = tstop; tstop = tstart + tslice; // Reset indentation if (logExplicit()) { if (tmax - tmin > tslice) { indent--; wrklog->indent(indent); } } } // endwhile: looped over time slices // Dump simulation results if (logNormal()) { *wrklog << gammalib::parformat("MC source photons", indent); *wrklog << nphotons; if (model->name().length() > 0) { *wrklog << " [" << model->name() << "]"; } *wrklog << std::endl; *wrklog << gammalib::parformat("MC source events", indent); *wrklog << events->size(); if (model->name().length() > 0) { *wrklog << " [" << model->name() << "]"; } *wrklog << std::endl; } } // endif: model was a sky model } // endfor: looped over models // Dump simulation results if (logNormal()) { *wrklog << gammalib::parformat("MC source events", indent); *wrklog << events->size(); *wrklog << " (all source models)"; *wrklog << std::endl; } // Reset indentation if (logNormal()) { if (events->ebounds().size() > 1) { indent--; wrklog->indent(indent); } } } // endfor: looped over all energy boundaries // Reset indentation if (logNormal()) { if (events->gti().size() > 1) { indent--; wrklog->indent(indent); } } } // endfor: looped over all time intervals // Reset indentation wrklog->indent(0); } // endif: observation pointer was valid // Return return; }