JBaselineComputer.hh

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#ifndef __JOSCPROB__JBASELINECOMPUTER__
#define __JOSCPROB__JBASELINECOMPUTER__
 
#include <cmath>
 
#include "JLang/JManip.hh"
 
 
/**
 * \author bjung
 * Auxiliary data structure for storing and computing oscillation baselines.
 */
 
namespace JOSCPROB {}
namespace JPP { using namespace JOSCPROB; }
 
namespace JOSCPROB {
  
 
  /**
   * Auxiliary data structure for storing and calculating baselines.
   */
  struct JBaselineComputer
  {
    /**
     * Default constructor.
     */
    JBaselineComputer() :
      Lmin(0.0),
      Lmax(0.0)
    {}
 
 
    /**
     * Constructor.
     *
     * \param  Lmin     Minimum baseline [km]
     * \param  Lmax     Maximum baseline [km]
     */
    JBaselineComputer(const double Lmin,
                      const double Lmax) :
      Lmin(Lmin),
      Lmax(Lmax)
    {}
 
 
    /**
     * Get minimum baseline.
     *
     * \return                 maximum baseline [km]
     */
    double getMinimumBaseline() const
    {
      return Lmin;
    }
 
    
    /**
     * Get maximum baseline.
     *
     * \return                 maximum baseline [km]
     */
    double getMaximumBaseline() const
    {
      return Lmax;
    }
 
 
    /**
     * Get inner radius.
     *
     * \return                inner radius [km]
     */
    double getInnerRadius() const
    {
      return 0.5 * (Lmax - Lmin);
    }
 
 
    /**
     * Get outer radius.
     *
     * \return                outer radius [km]
     */
    double getOuterRadius() const
    {
      return 0.5 * (Lmax + Lmin);;
    }
    
 
    /**
     * Get cosine zenith angle for a given baseline.
     *
     * \param  L              baseline [km]
     * \return                cosine zenith angle
     */
    double getCosth(const double L) const
    {
      const double r = getInnerRadius();
      const double R = getOuterRadius();
      
      return (R*R - r*r - L*L) / (2*L*r);
    }
 
    
    /**
     * Get baseline for a given cosine zenith angle.
     *
     * \param  costh           cosine zenith angle
     * \return                 baseline [km]
     */
    double getBaseline(const double costh) const
    {
      const double r = getInnerRadius();
      const double R = getOuterRadius();
 
      const double ct = (fabs(costh) < 1.0 ? costh : (costh < 0 ? -1.0 : 1.0));
    
      return (-r * ct + sqrt(R*R - r*r * (1 - ct) * (1 + ct)));
    }
    
 
    /**
     * Get baseline for a given cosine zenith angle.
     *
     * \param  costh           cosine zenith angle
     * \return                 baseline [km]
     */
    double operator()(const double costh) const
    {
      return getBaseline(costh);
    }
    
    
    /**
     * Stream input of baseline calculator.
     *
     * \param  in              input stream
     * \param  object          object
     * \return                 input stream
     */
    friend inline std::istream& operator>>(std::istream& in, JBaselineComputer& object)
    {
      return in >> object.Lmin >> object.Lmax;
    }
 
 
    /**
     * Stream output of baseline calculator.
     *
     * \param  out             output stream
     * \param  object          object
     * \return                 output stream
     */
    friend inline std::ostream& operator<<(std::ostream& out, const JBaselineComputer& object)
    {
      using namespace JPP;
      
      return out << FIXED(15,5) << object.Lmin << FIXED(15,5) << object.Lmax;
    }
 
    
  protected:
    
    double Lmin; //!< Minimum baseline [km]
    double Lmax; //!< Maximum baseline [km]
  };
}
 
#endif