...
The gas puffing units are electron/s in DYON and Pa*m^3/s in IMAS. The unit conversion is made on the assumption that the gas is H2 H2 (D2D2) molecules with the temperature of 300 K:
PIMAS = PDYON k T / 2,
with P the gas puffing, T = 300 K, k = 1.3807*10-23 J/K.
...