divertor_variables Module

area divertor / area main plasma (along separatrix)

angle of incidence of field line on plate (rad)

field line angle wrt divertor target plate (degrees)

poloidal plane angle between divertor plate and leg, inboard (rad)

poloidal plane angle between divertor plate and leg, outboard (rad)

reference B_p at outboard divertor strike point (T)

fitting coefficient to adjust ptpdiv, ppdiv

fitting coefficient to adjust ptpdiv, ppdiv

fitting coefficient to adjust ptpdiv, ppdiv

fitting coefficient to adjust ptpdiv, ppdiv

fitting coefficient to adjust ptpdiv, ppdiv

fitting coefficient to adjust ptpdiv, ppdiv

coeff for power distribution along main plasma

plasma density at divertor (10**20 /m3)

density at plate (on separatrix) (10**20 /m3)

divertor coolant fraction

divertor structure density (kg/m3)

switch for divertor Zeff model:

• =0 calc
• =1 input

divertor structure vertical thickness (m)

divertor plate mass (kg)

divertor plate thickness (m) (from Spears, Sept 1990)

divertor surface area (m2)

radial gradient ratio

divertor area fudge factor (for ITER, Sept 1990)

fraction of power to outboard divertor (for single null)

coefficient for gamdiv

The plasma flux expansion in the divertor (default 2; Wade 2020)

fraction of radiated power to plate

divertor heat load (MW/m2)

switch for user input hldiv:

• = 0: divtart model turned off and user inputs hldiv
• = 1: divtart model calculates hldiv
• = 2: divwade model calculates hldiv

heat load limit (MW/m2)

power fraction for outboard double-null scrape-off plasma

power flow width (m)

minimum strike angle for heat flux calculation

pressure ratio (nT)_plasma / (nT)_scrape-off

power spillage to private flux factor

peak heat load at plate (with radiation) (MW/m2)

n-scrape-off / n-average plasma; (input for ipedestal=0, = nesep/dene if ipedestal>=1)

peak temperature at the plate (eV)

connection length ratio, outboard side

ratio of collision length / connection length

maximum value for length ratio (rlclolcn) (constraintg eqn 22)

effective separatrix/divertor radius ratio

main plasma connection length (m)

temperature at divertor (eV) (input for stellarator only, calculated for tokamaks)

temperature at the separatrix (eV)

parallel heat transport coefficient (m2/s)

perpendicular heat transport coefficient (m2/s)

Zeff in the divertor region (if divdum/=0)