gray/input/gray.ini

[raytracing]
; Number of rays in the radial/angular direction
nrayr  = 1
nrayth = 16
; Normalized maximum radius of the beam power
rwmax = 1

; Switch between simple raytracing (0) and beamtracing (1)
igrad = 0

; Max number of passes inside the plasma  [multipass module]
; When positive reflections occur on the plasma limiter provided by the
; G-EQDSK file; when negative on a simple limiter at R=`rwall`, see below.
ipass = 1

; Whether to compute the wave polarisation
ipol = 0
; Step size (cm) for the numerical integration
dst = 0.1
; Max number of integration steps
nstep = 12000

; Choice of the integration variable
;  0: path length (s)
;  1: "time" (actually c⋅t)
;  2: real part of the eikonal (S_r)
idst = 0

; Choice of the integration method
;   0: Explicit Euler (1⁰ order)
;   1: Semi-implicit Euler (1⁰ order, symplectic)
;   2: Velocity Verlet (2⁰ order, symplectic)
;   3: 2-stage Runge-Kutta (2⁰ order)
;   4: 4-stage Runge-Kutta (4⁰ order)
integrator = 4

; Whether to automatically adjust the integration step
; size based on the local error. If true `dst` will set
; the initial step size.
adaptive_step = false

; Enable the realtime mode
; In realtime a single ray is traced until absorption reaches ≈50% of the
; total. The simulation is stopped immediately after returning only the
; position (as ρ_p=√ψ) of the peak. So, no post-processing is
; performed at all. In addition:
;  - all outputs units are inactivated (equivalent to passing --units 0);
;  - current drive computation is disabled (ecrh_cd.ieccd=0);
;  - absorption is computed in weakly relativistic approximation
;    (ecrh_cd.iwarm=1);
;  - reflections and multiple plasma passes are disabled;
realtime = false


[ecrh_cd]
; Choice of the power absorption model
;  0: no absorption at all
;  1: weakly relativistic
;  2: fully relativistic (faster variant)
;  3: fully relativistic (slower variant)
;  4: tenuous plasma (very fast)
; Note: iwarm>0 is required for current driver
iwarm = 2

; Order of the electron Larmor radius expansion
; (used by some absorption models)
ilarm = 5

; Max number of iterations for the solution of the dispersion relation.
; (used by some absorption models)
; Note: if negative the result of the first iteration will be used in
; case the result doesn't converge within |imx| iterations.
imx = -20

; Current drive model
;   0: no current drive at all
;   1: Cohen
;   2: no trapping
;   3: Neoclassical
ieccd = 3


[antenna]
; Wave launch angles (deg)
alpha = 45 ; Poloidal angle (positive → up)
beta  = 0  ; Toroidal angle (positive → right)

; Injected power (MW)
power = 1

; Polarisation mode
;   1: ordinary (O)
;   2: extraordinary (X)
iox = 1
; Alternatively, parameters of the polarisation ellipse
;   χ: angle between the principal axes and the (x,y) axes
;   ψ: atan(ε), where ε is the ellipticity
chi = 0
psi = 0

; Beam description kind
;  0: simple beam shape
;  1: 1D table
;  2: 2D table
ibeam = 0

; Filepath of the beam data (relative to this file)
filenm = "beamdata.txt"


[equilibrium]
; MHD equilibrium kind
;   0: vacuum (i.e. no plasma at all)
;   1: analytical
;   2: G-EQDSK format - data valid on the whole domain
;   3: G-EQDSK format - data valid only inside the LCFS
iequil = 3

; Filepath of the equilibrium data (relative to this file)
filenm = "magneticdata.eqdsk"
; COCOS index
icocos = 0

; Normalisation of the poloidal function
;   0: G-EQDSK, ψ → |ψ - ψ(edge)|/|ψ(axis) - ψ(edge)|
;   1: no normalisation
ipsinorm = 0

; G-EQDSK format parameters
; Whether header starts with a description, a.k.a identification string
idesc = 1
; Whether the records have variable length
; Note: some non-compliant programs output numbers formatted with variable length
; instead of using the single (5e16.9) specifier.
ifreefmt = 0

; Position of the X point
;   -1: bottom
;    0: no X point
;   +1: top
ixp = 0

; Tension of splines
; Note: 0 means perfect interpolation
ssplps = 0.005  ; for ψ(R,Z), normalised poloidal flux
ssplf = 0.01    ; for I(ψ)=R⋅B_T, poloidal current function

; Sign of toroidal field/current (used when COCOS index is 0,10)
; When viewing from above: +1 → counter-clockwise, -1 → clockwise
sgnb = -1
sgni = +1
; Rescaling factor for the magnetic field
factb = 1


[profiles]
; (input) plasma profiles parameters

; Profiles kind
;   0: analytical
;   1: numerical
iprof = 1

; Profile radial coordinate
;  0: ρ_t = √Φ (where Φ is the normalised toroidal flux)
;  1: ρ_p = √ψ (where ψ is the normalised poloidal flux)
;  2: normalised poloidal flux ψ
irho = 0

; Filepath of the equilibrium (relative to this file)
filenm = "profiles.txt"

; Tension of the density spline
; Note: 0 means perfect interpolation
sspld = 0.1

; Rescaling factor for electron temperature/density
factte = 1
factne = 1

; Choice of model for rescaling the temperature/density with the
; magnetic field
;   1: costant Greenwald density (ab=1)
;   2: no rescaling (ab=0)
iscal = 2


[output]
; Output data parameters

; ECRH&CD profiles grid:
; Radial coordinate
;  1: ρ_p = √ψ (where ψ is the normalised poloidal flux)
;  2: ρ_t = √Φ (where Φ is the normalised toroidal flux)
ipec = 1
; Number of points
nrho = 501

; Subsampling factors:
istpr = 5  ; beam cross section (units 8, 12)
istpl = 5  ; outer rays data (unit 33)


[misc]
; Other parameters

; Radius of the inner wall (m)  [multipass module]
; (when ipass<0, used to build a simple limiter for reflections)
rwall = 1.36