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RILIS cabin upgrade - impact on GLM/GHM
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Europe/Zurich
Description
During LS3, the RILIS cabin will be extended to increase both the capacity and the safety of the RILIS operation, which will benefit the wider physics community. A second iteration of the design has now been prepared, taking into account the detailed input provided by the GLM and GHM users.
The purpose of this meeting is to present this updated design and to receive any further feedback from the community, so that the layout can be finalised early next year.
RILIS cabin upgrade - impact on GLM/GHM
- Vincent shows the new design which increases the surface space by moving the concrete blocks and stairs, and increases the available height compared to previously proposed design (2.55 m below the high beams, 2.77 m below the concrete slab which forms the RILIS cabin floor). 80-cm distance from beam lines to concrete blocks is maintained, for first aid purposes.
- Needs to confirm with SCE feasibility of having 4-m high concrete blocks for shielding the stairs.
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For height comparison, the cable trays currently installed in the GLM area are at ~2.56 m height.
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Note that this is higher than the RILIS office (2.14 m under the beams and 2.3 m to the ceiling) and similar height as the RILIS labs.
- Letizia comments that there are no safety concerns for a 2.55-m ceiling height, to host all necessary equipment including routing of HV cables, etc.
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Juliana asks is there enough space to crane extra concrete blocks to provide more shielding for Mössbauer experiments? Vincent says yes.
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Alternative of movable shielding was also proposed, but this actually takes up a lot of floor space, seems not really suitable for GLM/GHM
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The options of adding a small craning underneath one of the beams on GLM was discussed, but this is not usefull since most installations are on wheels. Crane is only needed for concrete blocks.
- Guilherme appreciates the increased surface area thanks to the move of concrete blocks, and highlights how we should ensure to respect radiation safety measures while prioritizing the increased surface area.
- Suggests to add radiation monitors on the stairs side of the concrete blocks if this can help identify moments when the visitor path should not go up the stairs.
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Alexandre comments that this might be hard to coordinate.
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Hanne suggests that the stairs and REXTRAP platform can be temporarily/permanently removed from visit's path, since the place is difficult to host a group in any case. Only downside is that it gives a good view on the low energy-side, particularly VITO.
- Alexandre raises question about shielding the visitor room in bldg. 508: shall we consider blocking the line of sight for the worst case scenario (like Tb collections)?
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Alexandre comments that the best practice in terms of shielding is to install local shielding around the chamber (similarly to lead shielding surrounding MEDICIS collection chamber). Historically, this local shielding was not available in the 149Tb setup, and at that point increased ambient dose rate could be measured in the visitors room.
- Calculations by RP are needed to check that the currently proposed design satisfies radiation safety requirements in the worst case scenario.
- Vincent suggests as an alternative scenario to have an horizontal 10-cm high concrete slab which covers both GLM and GHM area, for shielding purposes. This would be the same slab that forms the floor of the RILIS cabin.
- Guilherme will check with his colleagues for height restrictions on their side.
- Hanne points out that if we were to pursue this option, we should collect setup measurements like we did for the GLM area.
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Guilherme suggests additional alternative scenario: placing a vertical shielding along the wall of the RILIS sas area/entrance, to shield the visitor room in 508.
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Design freeze foreseen for end of February, so comments and modifications should happen prior to that.
- Juliana says that April would be a good time for them to remove equipment from the GLM area (to have the space to install tape station, etc.), as collaborators will be onsite for MultiPAC installation.
- Juliana asks if it's possible to see the integration including the tapestation for all the different setups (in particular eMMA and eMIL) since she is concerned whether the space is sufficient to always allow the new implantation chamber to remain in place like it was intended or whether it will need to be moved out.
- Carlotta asks if moving the focal point of the GLM beamline further downstream due to installation of tape station would cause tuning/focusing problems. Guilherme comments that it’s easier to focus further than closer relative to the quadrupoles position, so there shouldn't be issues.
Actions
- Carlotta asks Vincent to integrate other setups in the drawing (new implantation chamber and Mössbauer setups).
- Juliana sends Carlotta the step files for Mössbauer setups.
- Vincent sends proposed design to Alexandre/Nadine/Elodie/Fabio of HSE-RP, so that they can do radiation safety calculations.
There are minutes attached to this event.
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