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// -*- C++ -*-
//
// Package: Alignment/CommonAlignment
// Class: MagneticFieldFilter
//
/**\class MagneticFieldFilter MagneticFieldFilter.cc Alignment/CommonAlignment/plugins/MagneticFieldFilter.cc
Description: Plugin to filter events based on the magnetic field value
Implementation:
Takes the magnet current from the RunInfoRcd and translates it into a
magnetic field value using the parameterization given here:
https://hypernews.cern.ch/HyperNews/CMS/get/magnetic-field/63/1/1/1.html
Agrees within an accuracy of ~20 mT with results of:
https://cmswbm.web.cern.ch/cmswbm/cmsdb/servlet/RunSummary
*/
//
// Original Author: Gregor Mittag
// Created: Wed, 25 Nov 2015 12:59:02 GMT
//
//
// user include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/stream/EDFilter.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "CondFormats/RunInfo/interface/RunInfo.h"
#include "CondFormats/DataRecord/interface/RunSummaryRcd.h"
//
// class declaration
//
class MagneticFieldFilter : public edm::stream::EDFilter<> {
public:
explicit MagneticFieldFilter(const edm::ParameterSet&);
~MagneticFieldFilter() override = default;
static void fillDescriptions(edm::ConfigurationDescriptions&);
private:
bool filter(edm::Event&, const edm::EventSetup&) override;
void beginRun(const edm::Run&, const edm::EventSetup&) override;
/// convert Ampere (A) to Tesla (T)
float currentToField(const float& current) const;
// ----------member data ---------------------------
// esConsumes
const edm::ESGetToken<RunInfo, RunInfoRcd> runInfoToken_;
/// see: https://hypernews.cern.ch/HyperNews/CMS/get/magnetic-field/63/1/1/1.html
static constexpr float linearCoeffCurrentToField_ = 2.084287e-04;
/// see: https://hypernews.cern.ch/HyperNews/CMS/get/magnetic-field/63/1/1/1.html
static constexpr float constantTermCurrentToField_ = 1.704418e-02;
const int magneticField_; /// magnetic field that is filtered
int magneticFieldCurrentRun_; /// magnetic field estimate of the current run
};
//
// static data member definitions
//
constexpr float MagneticFieldFilter::linearCoeffCurrentToField_;
constexpr float MagneticFieldFilter::constantTermCurrentToField_;
//
// constructor
//
MagneticFieldFilter::MagneticFieldFilter(const edm::ParameterSet& iConfig)
: runInfoToken_(esConsumes<edm::Transition::BeginRun>()),
magneticField_(iConfig.getUntrackedParameter<int>("magneticField")),
magneticFieldCurrentRun_(-10000) {}
//
// member functions
//
// ------------ method called on each new Event ------------
bool MagneticFieldFilter::filter(edm::Event&, const edm::EventSetup&) {
return magneticField_ == magneticFieldCurrentRun_;
}
// ------------ method called when starting to processes a run ------------
void MagneticFieldFilter::beginRun(const edm::Run&, const edm::EventSetup& iSetup) {
const auto& summary = &iSetup.getData(runInfoToken_);
// convert from Tesla to kGauss (multiply with 10) and
// round off to whole kGauss (add 0.5 and cast to int) as is done in
// 'MagneticField::computeNominalValue()':
magneticFieldCurrentRun_ = static_cast<int>(currentToField(summary->m_avg_current) * 10.0 + 0.5);
}
float MagneticFieldFilter::currentToField(const float& current) const {
return linearCoeffCurrentToField_ * current + constantTermCurrentToField_;
}
// ------------ method fills 'descriptions' with the allowed parameters for the module ------------
void MagneticFieldFilter::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
edm::ParameterSetDescription desc;
desc.setComment("Filters events with a magnetic field of 'magneticField'.");
desc.addUntracked<int>("magneticField", 38)->setComment("In units of kGauss (= 0.1 Tesla).");
descriptions.add("magneticFieldFilter", desc);
}
//define this as a plug-in
DEFINE_FWK_MODULE(MagneticFieldFilter);
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