Next100 shielding revision

next-exp / nexus

Geant4 simulation framework of the NEXT Collaboration

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Next100 shielding revision #111

Closed gondiaz closed 3 years ago

gondiaz commented 3 years ago

This PR revisits and updates the shielding geometry and generators. The dimensions and components were gently provided by Jordi Torrent and are shown in

Shielding.pdf pedastal.pdf

Besides the relevant change of the new dimensions, two extra changes are made in this revision:

the steel shielding in the laterals is enlarged, as shown in the drawings. The steel roof is also positioned above the inner steel box.
solves a bug in the distribution of the vertex generator in the steel shielding structure composed by the roof and the top beams. I have also tryed to rewrite the code to be more easily readable.

paolafer commented 3 years ago

Still to be implemented: different thickness of the beams (4 and 6 mm), two beams below the vessel, which support it, and should be simulated, since they are not shielded by the lead bricks.

paolafer commented 3 years ago

Regarding the vertices: we could probably drop the INNER_AIR region, since we are not generating background from the air inside the castle, right @jmunozv, @msorel? On the other hand, the SHIELDING_STEEL and PEDESTAL regions must be reviewed, because the vertices turn out to be generated in different volumes, so there must be some mismatch of dimensions/positions.

msorel commented 3 years ago

Regarding the vertices: we could probably drop the INNER_AIR region, since we are not generating background from the air inside the castle, right @jmunozv, @msorel? On the other hand, the SHIELDING_STEEL and PEDESTAL regions must be reviewed, because the vertices turn out to be generated in different volumes, so there must be some mismatch of dimensions/positions.

Concerning INNER_AIR, if the vertex generator does not do any harm, perhaps we can keep it. In normal operations, we will take NEXT-100 low-bgr data always with Rn abatement system on, so we won't generate radon in the air there. But perhaps one day we will want to estimate the contributions of Rn system being off, you never know... If it is not a problem, we could leave this capability in, unless I am missing something.

paolafer commented 3 years ago

In line with the coding conventions of nexus, try to keep all the lines between 80 and 100 characters.