ukaea / ukaea/PROCESS

Picture frame coil CP vertical tension

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@kj5248 is already working on this.

Since Oct 9, 2025.

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Description

In GitLab by @skahn on Jul 10, 2020, 16:39

Description

The STEP demoutable joints might be non-sliding. This means that, if there is not vertical compressive structures, a non negligible fraction of the vertical forces will be applied to the CP (around 65%).

Although this repartition depends of the coil shape, and more specifically to the coil curvature radius, the Princeton-D coil providing an equirepartition of the inboard-outboard vertical tention. As this repartition is quite complicated in reality and depends on both shape and inter-coil structure, the inboard vertical tension fraction can be set by the user.

However, in the case of a picture frame coil, this repartition can be relatively simply calculated as indicated in the following document

K:\Power Plant Physics and Technology\PROCESS\SCTF Model\Vertical force and moment on TF coil of finite thickness.pdf

The proposed action of the issue is to implement this formula in the case of a picture frame coil.

Ref : @stuartmuldrew, @mkovari and @jmorris-uk

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