A_FIELD Derived Type

  1. korc_types.f90
  2. korc_types
  3. A_FIELD

type, private :: A_FIELD

The analytical magnetic field is given by: where is the aspect ratio, the constant denotes the magnitude of the toroidal magnetic field, and is the poloidal magnetic field with safety factor . The constant is the safety factor at the magnetic axis and the constant is obtained from the values of and at the plasma edge .


Inherited by

type~~a_field~~InheritedByGraph type~a_field A_FIELD type~fields FIELDS type~fields->type~a_field AB

Contents

Variables

Source Code

A_FIELD

Components

TypeVisibility AttributesNameInitial
real(kind=rp), public :: Bo

Magnitude of the toroidal magnetic field .
real(kind=rp), public :: a

Plasma edge as measured from the magnetic axis.
real(kind=rp), public :: Ro

Radial position of the magnetic axis

real(kind=rp), public :: qa

Safety factor at the plasma edge.
real(kind=rp), public :: qo

Safety factor at the magnetic axis .
real(kind=rp), public :: lambda

parameter of .
real(kind=rp), public :: Bpo

@deprecated Parameter not used anymore.

real(kind=rp), public :: Bp_sign

Sign of . This depends on current_direction, Bp_sign=1 for current_direction='PARALLEL', and Bp_sign=-1 for current_direction='ANTI-PARALLEL'.
character(len=MAX_STRING_LENGTH), public :: current_direction

Direction of plasma current: PARALLEL or ANTI-PARALLEL to the toroidal magnetic field.
real(kind=rp), public :: Ero

radial electric field amplitude.
real(kind=rp), public :: rmn

mode location rmn
real(kind=rp), public :: sigmamn

mode width sigmamn

Source Code

  TYPE, PRIVATE :: A_FIELD
     !! @note Derived type having all the parameters of the analytical
     !! magnetic field included in KORC. @endnote
     !! The analytical magnetic field is given by:
     !! $$\mathbf{B}(r,\vartheta) = \frac{1}{1 + \eta \cos{\vartheta}}
     !! \left[ B_0 \hat{e}_\zeta  + B_\vartheta(r) \hat{e}_\vartheta \right],$$
     !! where \(\eta = r/R_0\) is the aspect ratio, the constant \(B_0\)
     !! denotes the magnitude of the toroidal magnetic field, 
     !! and \(B_\vartheta(r) = \eta B_0/q(r)\) is the poloidal magnetic
     !! field with safety factor 
     !! \(q(r) = q_0\left( 1 + \frac{r^2}{\lambda^2} \right)\). The
     !! constant \(q_0\) is the safety factor at 
     !! the magnetic axis and the constant \(\lambda\) is obtained from
     !! the values of \(q_0\) and \(q(r)\) 
     !! at the plasma edge \(r=r_{edge}\).

     REAL(rp) 			:: Bo 
     !! Magnitude of the toroidal magnetic field \(B_0\).
     REAL(rp) 			:: a 
     !! Plasma edge \(r_{edge}\) as measured from the magnetic axis.
     REAL(rp) 			:: Ro 
     !! Radial position of the magnetic axis \(R_0\)
     REAL(rp) 			:: qa 
     !! Safety factor at the plasma edge.
     REAL(rp) 			:: qo 
     !! Safety factor at the magnetic axis \(q_0\).
     REAL(rp) 			:: lambda 
     !! \(\lambda\) parameter of \(q(r)\).
     REAL(rp) 			:: Bpo 
     !! @deprecated Parameter not used anymore. @todo Delete parameter.
     REAL(rp) 			:: Bp_sign 
     !! Sign of \(B_\vartheta(r)\). This depends on current_direction,
     !! Bp_sign=1 for 
     !! current_direction='PARALLEL', and Bp_sign=-1 for
     !! current_direction='ANTI-PARALLEL'.
     CHARACTER(MAX_STRING_LENGTH) :: current_direction 
     !! Direction of plasma current: PARALLEL or ANTI-PARALLEL to the
     !! toroidal magnetic field.
     REAL(rp) 			:: Ero 
     !! radial electric field amplitude.
     REAL(rp) 			:: rmn
     !! mode location rmn
     REAL(rp)			:: sigmamn
     !! mode width sigmamn
  END TYPE A_FIELD