GammaLib  1.7.0.dev
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Pages
GCOMIaq::response_kernel Class Reference
Inheritance diagram for GCOMIaq::response_kernel:
GFunction

Public Member Functions

 response_kernel (const GCOMD1Response &response_d1, const GCOMD2Response &response_d2, const double &etrue1, const double &etrue2, const double &phibar, const double &etmin, const double &etmax, const double &e1min, const double &e1max, const double &e2min, const double &e2max)
 
double eval (const double &energy1)
 Computes product of D1 and D2 responses at energy E1 and phibar. More...
 
- Public Member Functions inherited from GFunction
 GFunction (void)
 Void constructor. More...
 
 GFunction (const GFunction &function)
 Copy constructor. More...
 
virtual ~GFunction (void)
 Destructor. More...
 
GFunctionoperator= (const GFunction &function)
 Assignment operator. More...
 

Protected Attributes

const GCOMD1Responsem_response_d1
 Reference to D1 module response. More...
 
const GCOMD2Responsem_response_d2
 Reference to D2 module response. More...
 
double m_etrue1
 True D1 energy (MeV) More...
 
double m_etrue2
 True D2 energy (MeV) More...
 
double m_cos_phibar
 cos(phibar) More...
 
double m_sin_phibar
 sin(phibar) More...
 
double m_etmin
 Minimum total energy (MeV) More...
 
double m_etmax
 Maximum total energy (MeV) More...
 
double m_e1min
 Minimum D1 energy (MeV) More...
 
double m_e1max
 Maximum D1 energy (MeV) More...
 
double m_e2min
 Minimum D2 energy (MeV) More...
 
double m_e2max
 Maximum D2 energy (MeV) More...
 

Additional Inherited Members

- Protected Member Functions inherited from GFunction
void init_members (void)
 Initialise class members. More...
 
void copy_members (const GFunction &function)
 Copy class members. More...
 
void free_members (void)
 Delete class members. More...
 

Detailed Description

Definition at line 97 of file GCOMIaq.hpp.

Constructor & Destructor Documentation

GCOMIaq::response_kernel::response_kernel ( const GCOMD1Response response_d1,
const GCOMD2Response response_d2,
const double &  etrue1,
const double &  etrue2,
const double &  phibar,
const double &  etmin,
const double &  etmax,
const double &  e1min,
const double &  e1max,
const double &  e2min,
const double &  e2max 
)
inline

Definition at line 99 of file GCOMIaq.hpp.

Member Function Documentation

double GCOMIaq::response_kernel::eval ( const double &  energy1)
virtual

Computes product of D1 and D2 responses at energy E1 and phibar.

Parameters
[in]energy1D1 energy deposit (MeV).

The method computes

\[ R(E_1,E_2|\hat{E_1},\hat{E_2}) = R_1(E_1|\hat{E_1}) \times R_2(E_2|\hat{E_2}) \times J \]

where \(R_1(E_1|\hat{E_1})\) is the D1 module response function, \(R_2(E_2|\hat{E_2})\) is the D2 module response function, \(E_1\) and \(E_2\) are the measured D1 and D2 energy deposits, respectively, \(\hat{E_1}\) and \(\hat{E_2}\) are the true D1 and D2 energy deposits, respectively, and \(J\) is the Jacobian.

The measured D2 energy deposit is computed using

\[ E_2 = \frac{1}{2} \times \left( \sqrt{\frac{4 m_e c^2 E_1}{1 - \cos \bar{\varphi}} + E_1^2} - E_1 \right) \]

where \(m_e\,c^2\) the electron rest mass, and \(\bar{\varphi}\) the Compton scatter angle.

The Jacobian is given by

\[ J = \frac{m_e c^2 \sqrt{E_1} \sin \bar{\varphi}} {(1 - \cos \bar{\varphi})^2 \sqrt{\frac{4 m_e c^2}{1 - \cos \bar{\varphi}} + E_1}} \]

The code implementation is based on the COMPASS RESPSIT2 function FUNC.F (release 4.0, 21-Oct-91).

Implements GFunction.

Definition at line 1366 of file GCOMIaq.cpp.

References abs(), m_cos_phibar, m_e1max, m_e1min, m_e2max, m_e2min, m_etmax, m_etmin, m_etrue1, m_etrue2, m_response_d1, m_response_d2, m_sin_phibar, gammalib::mec2, pow(), and sqrt().

Member Data Documentation

double GCOMIaq::response_kernel::m_cos_phibar
protected

cos(phibar)

Definition at line 128 of file GCOMIaq.hpp.

Referenced by eval().

double GCOMIaq::response_kernel::m_e1max
protected

Maximum D1 energy (MeV)

Definition at line 133 of file GCOMIaq.hpp.

Referenced by eval().

double GCOMIaq::response_kernel::m_e1min
protected

Minimum D1 energy (MeV)

Definition at line 132 of file GCOMIaq.hpp.

Referenced by eval().

double GCOMIaq::response_kernel::m_e2max
protected

Maximum D2 energy (MeV)

Definition at line 135 of file GCOMIaq.hpp.

Referenced by eval().

double GCOMIaq::response_kernel::m_e2min
protected

Minimum D2 energy (MeV)

Definition at line 134 of file GCOMIaq.hpp.

Referenced by eval().

double GCOMIaq::response_kernel::m_etmax
protected

Maximum total energy (MeV)

Definition at line 131 of file GCOMIaq.hpp.

Referenced by eval().

double GCOMIaq::response_kernel::m_etmin
protected

Minimum total energy (MeV)

Definition at line 130 of file GCOMIaq.hpp.

Referenced by eval().

double GCOMIaq::response_kernel::m_etrue1
protected

True D1 energy (MeV)

Definition at line 126 of file GCOMIaq.hpp.

Referenced by eval().

double GCOMIaq::response_kernel::m_etrue2
protected

True D2 energy (MeV)

Definition at line 127 of file GCOMIaq.hpp.

Referenced by eval().

const GCOMD1Response& GCOMIaq::response_kernel::m_response_d1
protected

Reference to D1 module response.

Definition at line 124 of file GCOMIaq.hpp.

Referenced by eval().

const GCOMD2Response& GCOMIaq::response_kernel::m_response_d2
protected

Reference to D2 module response.

Definition at line 125 of file GCOMIaq.hpp.

Referenced by eval().

double GCOMIaq::response_kernel::m_sin_phibar
protected

sin(phibar)

Definition at line 129 of file GCOMIaq.hpp.

Referenced by eval().


The documentation for this class was generated from the following files: