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ukaea / PROCESS

PROCESS is a systems code at UKAEA that calculates in a self-consistent manner the parameters of a fusion power plant with a specified performance, ensuring that its operating limits are not violated, and with the option to optimise to a given function of these parameters.
https://ukaea.github.io/PROCESS/
MIT License
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Implement new ripple calculation model for picture frame coils #1764

Closed jonmaddock closed 1 year ago

jonmaddock commented 2 years ago

In GitLab by @mn3981 on Oct 10, 2022, 14:03

Ken McClements has developed a new analytical model based on the vacuum Maxwell equations for picture frame coils. The current model by @mkovari is an empirical fit to a numerically determined ripple for D-shaped coils in a conventional aspect ratio tokamak.

The new model proposed by Ken is as follows:

\delta = \Bigg(\frac{R_{major}+R_{minor}}{r_{tf outboard}}\Bigg)^N

Where $N$ is the number of TF coils.

This model has been shown to have an agreement within 10% of numerical calculations.

A Desmos plot for comparison of the two models can be seen here

jonmaddock commented 2 years ago

In GitLab by @mn3981 on Oct 10, 2022, 14:06

created branch 1763-implement-new-ripple-calculation-model-for-picture-frame-coils to address this issue

jonmaddock commented 2 years ago

In GitLab by @stuartmuldrew on Oct 18, 2022, 11:45

closed via merge request !837

jonmaddock commented 2 years ago

In GitLab by @stuartmuldrew on Oct 18, 2022, 11:45

mentioned in commit eb7364a04c54799e9da2df4ec260e0e91b164b9b

jonmaddock commented 1 year ago

In GitLab by @mkovari on Apr 11, 2023, 14:30

Note that r_tf_outboard_mid is the radius of the midline of the TF outer leg. The calculation of the midline includes the case thickness, which can be substantial. The actual winding pack has a smaller major radius.