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## Plasma-Material Interaction Data Set 81

### Permeation of D in W

$$
P = P_0 \exp\left(-\frac{E_\mathrm{p}}{k_\mathrm{B}T}\right)
$$

[In the above formula, the Boltzmann constant is expressed in \(\mathrm{eV\,K^{-1}}\).]

- Material: W
- Material composition: 99.97%
- Method: Experiment
- Data scaled for isotope mass? No

*P*_{0} = 6.74e-07 mol m^{-1} s^{-1} Pa^{-1/2}
- T = 1200 – 2600 K

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- B62: G. Holzner, "Determining fundamental transport parameters of hydrogen isotopes in tungsten",
*[missing journal]* (2020). [https://mediatum.ub.tum.de/?id=1542224]

## Comment

Gas loading of cylindrical W specimen followed by unloading at given temperature and measurement of released H/D Data provided by M. Lavrentiev (UKAEA, 2024) with permission from STEP.