HCPB first wall

The HCPB-style first wall was based off the design from the following paper:

Zhou, G.; Hernández, F.A.; Pereslavtsev, P.; Kiss, B.; Retheesh, A.; Maqueda, L.; Park, J.H. The European DEMO Helium Cooled Pebble Bed Breeding Blanket: Design Status at the Conclusion of the Pre-Concept Design Phase. Energies 2023, 16, 5377. https://doi.org/10.3390/en16145377

This component has the class key first_wall. An example is given in examples/sample_first_wall.json. This component requires a material key with the desired material and geometrical parameters as shown in First wall parameters.

First wall parameters