RF Cavity can produce overlaps

The RF cavity with SRF geometry can produce overlaps. The following produce geometry that overlaps:

 rf1 : rfcavity, l=0.1*m, gradient = 0.1 * MV / m, outerDiameter=0.3*mm, material =  "Copper", cavityModel = "Tesla9Cell", frequency = 8*MHz; 
Tesla9Cell: cavitymodel,
       type="elliptical",
       irisRadius = 35*mm,
       equatorRadius = 103.3*mm,
!      halfCellLength = 57.7*mm,
       equatorHorizontalAxis = 40*mm,
       equatorVerticalAxis = 42*mm, 
       irisHorizontalAxis = 12*mm,
       irisVerticalAxis = 19*mm,
       tangentLineAngle = 13.3*pi/180,
       thickness = 1*mm,
       numberOfPoints = 24,
       numberOfCells = 1;

The code to create this geometry should warn that the chosen length of the object is incompatible with the cavity specifications.

Also, if a length longer than the cavity cell is provided, it should pad it with a straight section with the same aperture. Currently, the iris curves are placed at the edges and the cavity curves are central resulting in a straight angled section if the length is even slightly too long.

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