Slightly more realistic B-field

[jdkio]

This is what the real B-field will look like. When there's more steel, the B-field drops. The lowest B region is double thick, while the highest B region is thin.

We have the tech to add a super-realistic B-field. This can cause issues with analysis though. A good middle ground is to change to use three regions of constant B-field.

We want this for the FDR. Not clear if 1T B-field means 1T in thin region or 1T in thick region.

Image source
https://dunescience.slack.com/archives/C0183BT3W1W/p1782491700010429

See also
https://dunescience.slack.com/archives/C0183BT3W1W/p1782496225464669

[ast0815]

What is causing the peaks at the front and end of the detector?

[sushil1739]

1. Real end/fringe-field behavior,
2. The averaging choice over only B>0 points.

[jdkio]

@sushil1739, is this plot for a nominal 1T B-field or for a 1.3T field? If it's 1.3T then we want to scale the new values down.

Also, can you please extract the values of the flat areas for regions 1 and 2, and then the average for region 3? That's what we'd want to set the values to imo.

[sushil1739]

I cannot determine from the exported field-map values alone whether the map corresponds to the nominal 1.0 T or 1.3 T configuration. I am verifying the original magnet operating point with Marco before applying any rescaling.

The B-vs-z profile and the extracted representative values are shown below: