Plots from HFSS and related analysis
08-Jan-2007 Using single pocket model from .step file provided by design engineers
- Complete Model from design engineers
- HFSS simulation
- Simulated Model
- HFSS Results: Magnitude of S21 parameter, Real part of long. impedance, Imaginary part of long. impedance
Single Pocket L=0.6m
Here only the TEM mode is fed to HFSS waveports, adding more modes does not change the results.
- 3Dmodel1, 3Dmodel2
- Magnitude of S21 Parameter
- Longitudinal Impedance for different wire (beam) horizontal positions
- Longitudinal Effective Impedance for different wire (beam) horizontal positions
Two Pockets L=0.6m each, distance D=1.2m
Here simulations are done with 5 modes at HFSS wave ports, actually I've to check what happens with only 1 mode.
Wire diameter was increased from 0.5mm to 1mm to avoid excessive time consuming simulations.
The HFSS project file is HERE
Plots:
- Model : 3Dmodel_2pockets
- wire at 12.5 mm from pocket wall
- Magnitude of S21 Parameter
- Real Part of Long. Impedance
- Imaginary Part of Long. Impedance
- wire at 7.5 mm from pocket wall
- Magnitude of S21 Parameter
- Real Part of Long. Impedance
- Imaginary Part of Long. Impedance
- wire at 2.5 mm from pocket wall
- Magnitude of S21 Parameter
- Real Part of Long. Impedance
- Imaginary Part of Long. Impedance
Estimation of heating power due to real part of longitudinal impedance
Very preliminary plots. Prediction is based on model used for SPS kickers. TO BE CHECKED!
Single and double pocket using nominal RMS bunch length = 0.25 ns:
Single Pocket only, dependence on bunch length:
