1. Optimized Nose Cavity Geometry for Dual Helicity Targets
Simulated with COMSOL Multiphysics
By Josh Pond
University of Virginia

2. Testing of Nose design from Practical Experiment
We began by mimicking the geometry from the SolidWorks file we received and simulating under similar parameters as our older tests to get a baseline and feel for the nose.

3. Addition of Target Cups
Next we added target cups to test for the irradiation of the targets.

4. Test Norm of Power in the Surface of the cups as frequency changed.
After each simulation we took the integral of the norm of the power over the surface of each cup.
(emw.Poavx^2 + emw.Poavy^2 + emw.Poavz^2)^.5

5. Upward trend as a function of Frequency
Due to limits in COMSOL’s linear equation solver, the simulation in 3D has to be run at a frequency close to 14 GHz. We use points taken in this range to extrapolate the power at 140 GHz.
|Power| (W)
Frequency (GHz)

6. Testing our own designs

7. Testing in 2D
Because of the drastically smaller geometries in 2D we were able to simulate at 140 GHz. Both of these designs are very promising; returning very high power through the cups, and a very close ratio.

8. Moving forward
The last step will be to compare 3D and 2D models to make our final judgments on nose geometry.