Integrated Modeling of Tokamak Plasmas

DIII-D 132014

&tbl_param             ! (anomalous) turbulence diffusion
tbl_diffusion_on=1     ! 0: no turbulence diffusion, 1: simple turbulence diffusion
tbl_diffusion_mode=3   ! 1 = random walk model, 2 = advection-diffusion model
! mode=2 enables separate control of particle and heat diffusion
tbl_stop_time=500000   ! Stop the turbulence diffusion
tbl_period = 1       ! frequency of calling turbulence diffusion and fmcfm_call

tbl_d_profile_on=-1     ! 1: spatially varying D_turb profile (tanh), 0: spatially constant profile in pedestal region
tbl_slope_on=0         ! D_turb turned on only within finite poloidal angles (+45 deg) around outside midplane
tbl_d_profile_psicen=0.93D0  ! D_turb profile center
tbl_d_profile_psiwid=0.02D0  ! D_turb profile full width
tbl_d_profile_psicen2=0.999D0  ! D_turb profile center
tbl_d_profile_psiwid2=-0.01D0  ! D_turb profile full width

! particle diffusivities (random walk diffusion coefficients)
tbl_D_coeff_in=0.2D0     ! m^2/sec, inside (pedestal top) value of D_turb
tbl_D_coeff=0.03D0      ! m^2/sec, outside (pedestal bottom) value of D_turb
tbl_D_coeff2=0.6D0     ! m^2/sec, D_turb for outside of separatrix (SOL+private flux region)

! ion thermal diffusivities
tbl_therDi_coeff_in=.070D0    ! m^2/sec, inside (pedestal top) value of thermal D_turb for ions
tbl_therDi_coeff=-0.050D0    ! m^2/sec, outside (pedestal bottom) value of thermal D_turb for ions
tbl_therDi_coeff2=0.9D0    ! m^2/sec, thermal D_turb for outside of separatrix (SOL+private flux region) for ions

! electron thermal diffusivities
tbl_therDe_coeff_in=0.8D0    ! m^2/sec, inside (pedestal top) value of thermal D_turb for electrons
tbl_therDe_coeff=-0.1D0    ! m^2/sec, outside (pedestal bottom) value of thermal D_turb for electrons
tbl_therDe_coeff2=0.9D0    ! m^2/sec, thermal D_turb for outside of separatrix (SOL+private flux region) for electrons

DIII-D 132016

&tbl_param             ! (anomalous) turbulence diffusion
tbl_diffusion_on=1     ! 0: no turbulence diffusion, 1: simple turbulence diffusion
tbl_diffusion_mode=3   ! 1 = random walk model, 2 = advection-diffusion model
! mode=2 enables separate control of particle and heat diffusion
tbl_stop_time=500000   ! Stop the turbulence diffusion
tbl_period = 1       ! frequency of calling turbulence diffusion and fmcfm_call

tbl_d_profile_on=-1     ! 1: spatially varying D_turb profile (tanh), 0: spatially constant profile in pedestal region
tbl_slope_on=0         ! D_turb turned on only within finite poloidal angles (+45 deg) around outside midplane
tbl_d_profile_psicen=0.94D0  ! D_turb profile center
tbl_d_profile_psiwid=0.02D0  ! D_turb profile full width
tbl_d_profile_psicen2=0.999D0  ! D_turb profile center
tbl_d_profile_psiwid2=-0.01D0  ! D_turb profile full width

! particle diffusivities (random walk diffusion coefficients)
tbl_D_coeff_in=0.13D0     ! m^2/sec, inside (pedestal top) value of D_turb
tbl_D_coeff=0.04D0      ! m^2/sec, outside (pedestal bottom) value of D_turb
tbl_D_coeff2=0.3D0     ! m^2/sec, D_turb for outside of separatrix (SOL+private flux region)

! ion thermal diffusivities
tbl_therDi_coeff_in=0.1D0    ! m^2/sec, inside (pedestal top) value of thermal D_turb for ions
tbl_therDi_coeff=-0.05D0    ! m^2/sec, outside (pedestal bottom) value of thermal D_turb for ions
tbl_therDi_coeff2=0.7D0    ! m^2/sec, thermal D_turb for outside of separatrix (SOL+private flux region) for ions

! electron thermal diffusivities
tbl_therDe_coeff_in=0.25D0    ! m^2/sec, inside (pedestal top) value of thermal D_turb for electrons
tbl_therDe_coeff=-0.05D0    ! m^2/sec, outside (pedestal bottom) value of thermal D_turb for electrons
tbl_therDe_coeff2=0.7D0    ! m^2/sec, thermal D_turb for outside of separatrix (SOL+private flux region) for electrons
/

DIII-D 132017

&tbl_param             ! (anomalous) turbulence diffusion
tbl_diffusion_on=1     ! 0: no turbulence diffusion, 1: simple turbulence diffusion
tbl_diffusion_mode=3   ! 1 = random walk model, 2 = advection-diffusion model
! mode=2 enables separate control of particle and heat diffusion
tbl_stop_time=500000   ! Stop the turbulence diffusion
tbl_period = 1       ! frequency of calling turbulence diffusion and fmcfm_call

tbl_d_profile_on=-1     ! 1: spatially varying D_turb profile (tanh), 0: spatially constant profile in pedestal region
tbl_slope_on=0         ! D_turb turned on only within finite poloidal angles (+45 deg) around outside midplane
tbl_d_profile_psicen=0.91D0  ! D_turb profile center
tbl_d_profile_psiwid=0.02D0  ! D_turb profile full width
tbl_d_profile_psicen2=0.995D0  ! D_turb profile center
tbl_d_profile_psiwid2=-0.01D0  ! D_turb profile full width

! particle diffusivities (random walk diffusion coefficients)
tbl_D_coeff_in=0.13D0     ! m^2/sec, inside (pedestal top) value of D_turb
tbl_D_coeff=0.015D0      ! m^2/sec, outside (pedestal bottom) value of D_turb
tbl_D_coeff2=0.3D0     ! m^2/sec, D_turb for outside of separatrix (SOL+private flux region)

! ion thermal diffusivities
tbl_therDi_coeff_in=.1D0    ! m^2/sec, inside (pedestal top) value of thermal D_turb for ions
tbl_therDi_coeff=0.001D0    ! m^2/sec, outside (pedestal bottom) value of thermal D_turb for ions
tbl_therDi_coeff2=0.5D0    ! m^2/sec, thermal D_turb for outside of separatrix (SOL+private flux region) for ions

! electron thermal diffusivities
tbl_therDe_coeff_in=0.35D0    ! m^2/sec, inside (pedestal top) value of thermal D_turb for electrons
tbl_therDe_coeff=-0.1D0    ! m^2/sec, outside (pedestal bottom) value of thermal D_turb for electrons
tbl_therDe_coeff2=0.9D0    ! m^2/sec, thermal D_turb for outside of separatrix (SOL+private flux region) for electrons
/

DIII-D 132018

&tbl_param             ! (anomalous) turbulence diffusion
tbl_diffusion_on=1     ! 0: no turbulence diffusion, 1: simple turbulence diffusion

tbl_diffusion_mode=3   ! 1 = random walk model, 2 = advection-diffusion model
! mode=2 enables separate control of particle and heat diffusion
tbl_stop_time=500000   ! Stop the turbulence diffusion
tbl_period = 1       ! frequency of calling turbulence diffusion and fmcfm_call

tbl_d_profile_on=-1     ! 1: spatially varying D_turb profile (tanh), 0: spatially constant profile in pedestal region
tbl_slope_on=0         ! D_turb turned on only within finite poloidal angles (+45 deg) around outside midplane
tbl_d_profile_psicen=0.89D0  ! D_turb profile center
tbl_d_profile_psiwid=0.02D0  ! D_turb profile full width
tbl_d_profile_psicen2=0.995D0  ! D_turb profile center
tbl_d_profile_psiwid2=-0.01D0  ! D_turb profile full width

! particle diffusivities (random walk diffusion coefficients)
tbl_D_coeff_in=0.05D0     ! m^2/sec, inside (pedestal top) value of D_turb
tbl_D_coeff=0.002D0      ! m^2/sec, outside (pedestal bottom) value of D_turb
tbl_D_coeff2=1D0     ! m^2/sec, D_turb for outside of separatrix (SOL+private flux region)

! ion thermal diffusivities
tbl_therDi_coeff_in=0.5D0    ! m^2/sec, inside (pedestal top) value of thermal D_turb for ions
tbl_therDi_coeff=0.001D0    ! m^2/sec, outside (pedestal bottom) value of thermal D_turb for ions
tbl_therDi_coeff2=2.0D0    ! m^2/sec, thermal D_turb for outside of separatrix (SOL+private flux region) for ions

! electron thermal diffusivities
tbl_therDe_coeff_in=.8D0    ! m^2/sec, inside (pedestal top) value of thermal D_turb for electrons
tbl_therDe_coeff=-0.07D0    ! m^2/sec, outside (pedestal bottom) value of thermal D_turb for electrons
tbl_therDe_coeff2=0.2D0    ! m^2/sec, thermal D_turb for outside of separatrix (SOL+private flux region) for electrons
/

The effect of neutrals is studied for the discharge DIII-D 132016. The heat load width is relatively weekly affected by the neutral collisions.

Summary, the effect of neutrals are rather small comparing to the anomalous effects.