!
! This file is part of SACAMOS, State of the Art CAble MOdels for Spice. 
! It was developed by the University of Nottingham and the Netherlands Aerospace 
! Centre (NLR) for ESA under contract number 4000112765/14/NL/HK.
! 
! Copyright (C) 2016-2018 University of Nottingham
! 
! SACAMOS is free software: you can redistribute it and/or modify it under the 
! terms of the GNU General Public License as published by the Free Software 
! Foundation, either version 3 of the License, or (at your option) any later 
! version.
! 
! SACAMOS is distributed in the hope that it will be useful, but 
! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
! or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License 
! for more details.
! 
! A copy of the GNU General Public License version 3 can be found in the 
! file GNU_GPL_v3 in the root or at <http://www.gnu.org/licenses/>.
! 
! SACAMOS uses the EISPACK library (in /SRC/EISPACK). EISPACK is subject to 
! the GNU Lesser General Public License. A copy of the GNU Lesser General Public 
! License version can be found in the file GNU_LGPL in the root of EISPACK 
! (/SRC/EISPACK ) or at <http://www.gnu.org/licenses/>.
! 
! The University of Nottingham can be contacted at: ggiemr@nottingham.ac.uk
!
!
! File Contents:
! SUBROUTINE twinax_set_parameters
! SUBROUTINE twinax_set_internal_domain_information
! SUBROUTINE twinax_plot
!
! NAME
!     twinax_set_parameters
!
! AUTHORS
!     Chris Smartt
!
! DESCRIPTION
!     Set the overall parameters for a twinax cable
!
! COMMENTS
!      
!
! HISTORY
!
!     started 5/9/2016 CJS based on twinax.F90
!     16/11/2017 CJS Include network synthesis process to replace s-domain transfer functions
!     October 2023 CJS Proximity_effects branch: Embed FastHenry2 frequency dependent proximity effects
!
!
SUBROUTINE twinax_set_parameters(cable)

USE type_specifications

IMPLICIT NONE

! variables passed to subroutine

  type(cable_specification_type),intent(INOUT)    :: cable

! local variables

! START

  cable%cable_type=cable_geometry_type_twinax
  cable%tot_n_conductors=3
  cable%tot_n_domains=2
  cable%n_external_conductors=1
  cable%n_internal_conductors=2
  cable%n_internal_domains=1
  cable%n_parameters=8
  cable%n_dielectric_filters=2
  cable%n_transfer_impedance_models=1

END SUBROUTINE twinax_set_parameters
!
! NAME
!     twinax_set_internal_domain_information
!
! AUTHORS
!     Chris Smartt
!
! DESCRIPTION
!     Set the overall parameters for a twinax cable
!
! COMMENTS
!     Set the dimension of the domain transformation matrices to include an external reference conductor for the cable 
!      
!
! HISTORY
!
!     started 5/9/2016 CJS based on twinax.F90
!     19/9/2016 CJS frequency dependent dielectric in Laplace solver
!     8/5/2017         CJS: Include references to Theory_Manual
!     30/10/2023       CJS: Start FastHenry model
!
!
SUBROUTINE twinax_set_internal_domain_information(cable)

USE type_specifications
USE constants
USE general_module
USE maths
USE PUL_parameter_module

IMPLICIT NONE

! variables passed to subroutine

  type(cable_specification_type),intent(INOUT)    :: cable

! local variables

  integer :: n_conductors
  integer :: dim

  integer :: domain

  type(PUL_type)    :: PUL
  
  integer :: ierr,i
  
  real(dp) :: epsr
 
! variables for cable parameter checks 
  logical :: cable_spec_error
  real(dp) :: rw
  real(dp) :: s
  real(dp) :: rd
  real(dp) :: rs
  real(dp) :: rd2
  real(dp) :: t
  real(dp) :: sigma_w
  real(dp) :: sigma_s
 
  type(Sfilter) :: epsr1,epsr2,ZT
  
  character(LEN=error_message_length) :: message 

! START

! Check the cable parameters

  rw=cable%parameters(1)
  rd=cable%parameters(2)
  s=cable%parameters(3)
  rs=cable%parameters(4)
  t=cable%parameters(5)
  rd2=cable%parameters(6)
  sigma_w=cable%parameters(7)
  sigma_s=cable%parameters(8)
  
  epsr1=cable%dielectric_filter(1)
  epsr2=cable%dielectric_filter(2)
  ZT=cable%transfer_impedance(1)
  
  cable_spec_error=.FALSE.    ! assume no errors initially
  message=''
  CALL shielded_twisted_pair_check(rw,rd,s,rs,rd2,cable_spec_error,cable%cable_name,message)
  CALL conductivity_check(sigma_w,cable_spec_error,cable%cable_name,message)
  CALL conductivity_check(sigma_s,cable_spec_error,cable%cable_name,message)
  CALL dielectric_check(epsr1,cable_spec_error,cable%cable_name,message)
  CALL dielectric_check(epsr2,cable_spec_error,cable%cable_name,message)
  CALL transfer_impedance_check(Zt,cable_spec_error,cable%cable_name,message)
  CALL surface_impedance_check(ZT,sigma_s,rs,t,cable_spec_error,cable%cable_name,message)
  
  if (cable_spec_error) then       
    run_status='ERROR in cable_model_builder, error on parameters for cable:'//trim(cable%cable_name)//'. '//trim(message)
    CALL write_program_status()
    STOP 1
  end if
    
! Set the parameters for the single internal domain  
  domain=1
    
  cable%n_internal_conductors_in_domain(domain)=3
    
! The number of modes in the internal domain is 2

  dim=2
  cable%L_domain(domain)%dim=dim
  ALLOCATE(cable%L_domain(domain)%mat(dim,dim))
  cable%C_domain(domain)%dim=dim
  ALLOCATE(cable%C_domain(domain)%mat(dim,dim))

  epsr=evaluate_Sfilter_high_frequency_limit(epsr1)
  
!  if (use_laplace) then
  if ( (use_laplace).OR.(use_FastHenry) ) then
  
! allocate memory for the PUL parameter solver interface

    if(verbose) write(*,*)'Domain:',domain
    if(verbose) write(*,*)'Allocating PUL data structure for twinax'
    n_conductors=3
    
    CALL allocate_and_reset_PUL_data(PUL,n_conductors)
    
    PUL%shape(1:n_conductors)=circle
    
    PUL%x(1)=-s/2d0
    PUL%y(1)=0.0
    PUL%r(1)=rw
    PUL%rd(1)=rd
    PUL%epsr(1)=epsr1
    PUL%sigma(1)=sigma_w
    
    PUL%x(2)=s/2d0
    PUL%y(2)=0.0
    PUL%r(2)=rw
    PUL%rd(2)=rd
    PUL%epsr(2)=epsr1
    PUL%sigma(2)=sigma_w
    
    PUL%epsr_background = 1d0  ! permittivity of homogeneous dielectric medium surrounding conductors (air)
    
! no ground plane
    PUL%ground_plane_present=.FALSE.
      
! add overshield i.e. the twinax shield
    PUL%overshield_present=.TRUE.
    PUL%overshield_x = 0d0          ! shield is centred at the origin in this calculation
    PUL%overshield_y = 0d0
    PUL%overshield_r = rs           ! twinax shield radius
    
    CALL PUL_LC_Laplace(PUL,cable%cable_name,cable%Y_fit_model_order,cable%Y_fit_freq_spec,domain) 
    
    cable%L_domain(domain)%mat(:,:)=PUL%L%mat(:,:)
    cable%C_domain(domain)%mat(:,:)=PUL%C%mat(:,:)
    
    cable%Z_domain(domain)%dim=dim
    ALLOCATE(cable%Z_domain(domain)%sfilter_mat(dim,dim))
    cable%Y_domain(domain)%dim=dim
    ALLOCATE(cable%Y_domain(domain)%sfilter_mat(dim,dim))
    
    cable%Y_domain(domain)%sfilter_mat(:,:)=PUL%Yfilter%sfilter_mat(:,:)
      
    if (use_FastHenry) then      
      CALL PUL_RL_FastHenry2(PUL,cable%cable_name,cable%Y_fit_model_order,cable%Y_fit_freq_spec,domain)   
    end if
    
    cable%Z_domain(domain)%sfilter_mat(:,:)=PUL%Zfilter%sfilter_mat(:,:)
    
  else
  
! See C.R. Paul, 1st edition, equation 3.67a,b with cos(thetaij)=-1 ! Theory_Manual_Eqn 2.27, 2.28

    cable%L_domain(domain)%mat(1,1)=(mu0/(2d0*pi))*log( (rs**2-(s/2d0)**2)/(rs*rw) )
    cable%L_domain(domain)%mat(1,2)=(mu0/(2d0*pi))*log( (s/(2d0*rs)) * (rs**2+(s/2d0)**2)/(2d0*(s/2d0)**2) )
    cable%L_domain(domain)%mat(2,1)=cable%L_domain(domain)%mat(1,2)
    cable%L_domain(domain)%mat(2,2)=cable%L_domain(domain)%mat(1,1)
  
! calculate the capacitance matrix from the inverse of the inductance matrix *eps0*epsr*mu0
! Note this is for a homogeneous medium within the twinax internal domain

    ierr=0   ! set ierr=0 on input to matrix inverse to cause the program to stop if we have a singular matrix
    CALL  dinvert_Gauss_Jordan(cable%L_domain(domain)%mat,2,cable%C_domain(domain)%mat,2,ierr)
    cable%C_domain(domain)%mat(:,:)=eps0*epsr*mu0*cable%C_domain(domain)%mat(:,:)
  
    CALL Z_Y_from_L_C(cable%L_domain(domain),cable%C_domain(domain),cable%Z_domain(domain),cable%Y_domain(domain))
  
  end if 
  
  if (use_laplace) CALL deallocate_PUL_data(PUL)  ! deallocate the PUL data structure

! Set the domain decomposition matrices ! Theory_Manual_Eqn 6.7, 6.8

! The dimension of the domain transformation matrices is 4
  dim=4
  cable%MI%dim=dim
  ALLOCATE(cable%MI%mat(dim,dim))
  cable%MV%dim=dim
  ALLOCATE(cable%MV%mat(dim,dim))

  cable%MI%mat(1,1)=1d0
  cable%MI%mat(1,2)=0d0
  cable%MI%mat(1,3)=0d0
  cable%MI%mat(1,4)=0d0
  
  cable%MI%mat(2,1)=0d0
  cable%MI%mat(2,2)=1d0
  cable%MI%mat(2,3)=0d0
  cable%MI%mat(2,4)=0d0
  
  cable%MI%mat(3,1)=1d0
  cable%MI%mat(3,2)=1d0
  cable%MI%mat(3,3)=1d0
  cable%MI%mat(3,4)=0d0
  
  cable%MI%mat(4,1)=1d0
  cable%MI%mat(4,2)=1d0
  cable%MI%mat(4,3)=1d0
  cable%MI%mat(4,4)=1d0


  cable%MV%mat(1,1)=1d0
  cable%MV%mat(1,2)=0d0
  cable%MV%mat(1,3)=-1d0
  cable%MV%mat(1,4)=-0d0
  
  cable%MV%mat(2,1)=0d0
  cable%MV%mat(2,2)=1d0
  cable%MV%mat(2,3)=-1d0
  cable%MV%mat(2,4)=0d0
  
  cable%MV%mat(3,1)=0d0
  cable%MV%mat(3,2)=0d0
  cable%MV%mat(3,3)=1d0
  cable%MV%mat(3,4)=-1d0
  
  cable%MV%mat(4,1)=0d0
  cable%MV%mat(4,2)=0d0
  cable%MV%mat(4,3)=0d0
  cable%MV%mat(4,4)=1d0

! Set the local reference conductor numbering  
  ALLOCATE( cable%local_reference_conductor(3) )
  cable%local_reference_conductor(1)=3              ! inner wire, reference is the shield conductor
  cable%local_reference_conductor(2)=3              ! inner wire, reference is the shield conductor
  cable%local_reference_conductor(3)=0              ! external domain conductor, reference not known

! Set the local domain information: include a reference conductor in the count
  ALLOCATE( cable%local_domain_n_conductors(1:cable%tot_n_domains) )
  cable%local_domain_n_conductors(1)=3              ! internal domain 
  cable%local_domain_n_conductors(2)=2              ! external domain 
  
! Set the external domain conductor and dielectric information
   
  ALLOCATE( cable%external_model(cable%n_external_conductors) )
  CALL reset_external_conductor_model(cable%external_model(1))
  cable%external_model(1)%conductor_type=circle
  cable%external_model(1)%conductor_is_shield=.TRUE.
  cable%external_model(1)%conductor_radius=rs
  cable%external_model(1)%dielectric_radius=rd2
  cable%external_model(1)%dielectric_epsr=epsr2
  cable%external_model(1)%conductor_sigma=sigma_s          ! For FastHenry2
    
! set the conductor impedance model for the two inner conductors
  do i=1,2
    cable%conductor_impedance(i)%impedance_model_type=impedance_model_type_cylindrical_with_conductivity
    cable%conductor_impedance(i)%radius=rw
    cable%conductor_impedance(i)%conductivity=sigma_w
  end do
    
! set the impedance model for the shield conductor
    
  cable%conductor_impedance(3)%impedance_model_type=impedance_model_type_cylindrical_shield
  cable%conductor_impedance(3)%radius=rs
  cable%conductor_impedance(3)%thickness=t
  cable%conductor_impedance(3)%conductivity=sigma_s
  cable%conductor_impedance(3)%ZT_filter=ZT
  
  CALL deallocate_Sfilter(epsr1)
  CALL deallocate_Sfilter(epsr2)
  CALL deallocate_Sfilter(ZT)
  
  ALLOCATE( cable%conductor_label(1:cable%tot_n_conductors) )
  cable%conductor_label(1)='Cable name: '//trim(cable%cable_name)//   &
                           '. type: '//trim(cable%cable_type_string)//'. conductor 1 : Twinax inner wire 1'
  cable%conductor_label(2)='Cable name: '//trim(cable%cable_name)//   &
                           '. type: '//trim(cable%cable_type_string)//'. conductor 2 : Twinax inner wire 2'
  cable%conductor_label(3)='Cable name: '//trim(cable%cable_name)//   &
                           '. type: '//trim(cable%cable_type_string)//'. conductor 3 : Shield'

END SUBROUTINE twinax_set_internal_domain_information
!
! NAME
!     twinax_plot
!
! AUTHORS
!     Chris Smartt
!
! DESCRIPTION
!     plot twinax cable 
!
! COMMENTS
!     the angle has an impact here...
!     The conductor geometry must be consistent with the documentation...
!
! HISTORY
!
!     started 5/9/2016 CJS based on twinax.F90
!
SUBROUTINE twinax_plot(cable,x_offset,y_offset,theta,xmin,xmax,ymin,ymax)

USE type_specifications
USE general_module

IMPLICIT NONE

! variables passed to subroutine

  type(cable_specification_type),intent(IN)    :: cable
  
  real(dp),intent(IN) :: x_offset,y_offset,theta
  real(dp),intent(INOUT) ::  xmin,xmax,ymin,ymax

! local variables

  real(dp) :: x,y,r,rd
  real(dp) :: s

! START

! plot inner conductor, 1
  r=cable%parameters(1)   ! inner conductor radius
  rd=cable%parameters(2)  ! inner dielectric radius
  s=cable%parameters(3)   ! inner conductor separation
  x=x_offset+(s/2d0)*sin(-theta)
  y=y_offset+(s/2d0)*cos(-theta)

  CALL write_circle(x,y,r,conductor_geometry_file_unit,xmin,xmax,ymin,ymax)

! plot inner dielectric 1
  CALL write_circle(x,y,rd,dielectric_geometry_file_unit,xmin,xmax,ymin,ymax)

! plot inner conductor, 2
  x=x_offset-(s/2d0)*sin(-theta)
  y=y_offset-(s/2d0)*cos(-theta)

  CALL write_circle(x,y,r,conductor_geometry_file_unit,xmin,xmax,ymin,ymax)
  
! plot inner dielectric 2
  CALL write_circle(x,y,rd,dielectric_geometry_file_unit,xmin,xmax,ymin,ymax)

! plot shield conductor
  r=cable%parameters(4)   ! shield radius
  x=x_offset
  y=y_offset

  CALL write_circle(x,y,r,conductor_geometry_file_unit,xmin,xmax,ymin,ymax)

! plot circular dielectric
  rd=cable%parameters(6)   ! outer dielectric radius
  x=x_offset
  y=y_offset

  CALL write_circle(x,y,rd,dielectric_geometry_file_unit,xmin,xmax,ymin,ymax)
  
  RETURN
  
END SUBROUTINE twinax_plot