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RFQ Design Optimisation with Electromagnetic Simulations

Explore the process of designing and optimizing Radio Frequency Quadrupoles (RFQs) using electromagnetic simulations for efficient beam acceleration. This study demonstrates the simulation, meshing, and tuning methods for both rod and vane type RFQ designs to achieve the desired resonant frequency and Q-value. Discover how the use of 3D modeling software streamlines the simulation process and enhances engineering features in the design. The conclusions and future plans highlight the progress made in optimizing the RFQ designs for improved performance.

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RFQ Design Optimisation with Electromagnetic Simulations

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  1. Status of the FETS Radio Frequency Quadrupole Ajit Kurup UKNFIC Meeting 20th October 2005

  2. Introduction • RFQ requirements: Bunch and accelerate 65mA beam from 65keV to 3MeV. • Resonant frequency is 324MHz. • Can have a either a rod type or vane type rfq. • The plan was • Do simulations for both types to get a design that resonates at the correct frequency. The designs have to include tuning, power coupling ports and vacuum ports and other engineering features. • Build models of both designs to test the accuracy of the simulations. • Optimise the q-value of the designs. Ajit Kurup

  3. 4 rod VS. 4 vane Ajit Kurup

  4. Electromagnetic Simulations • Use Inventor to draw a 3D model and import this into the program that will do the electromagnetic simulation. • Eliminates the need to duplicate the drawing in different programs. • Easier to get engineering features in the model. • MAFIA was originally used to do the simulations. • Solves Maxwell’s equations (using the finite integration method) to get the resonant frequency. • Geometry needs to be discretised. Ajit Kurup

  5. Meshing Automatic meshing in Microwave Studio Manual Meshing in MAFIA Ajit Kurup

  6. 4 Vane Model Ajit Kurup

  7. 4 Vane Model 2 217.4mm B Field Surface current density Ajit Kurup

  8. 4 Vane Model 3 quadrupole field dipole field Ajit Kurup

  9. 4 Vane Model 4 Ajit Kurup

  10. Tuning Ajit Kurup

  11. 4 Rod 89mm 90mm 65mm B Field Surface current density Ajit Kurup

  12. Conclusions and Future Plans • Simulations have been done for a 4 vane and 4 rod rfq to obtain designs that resonate at 324 MHz. • 4 vane cold model is about to be manufactured • Optimise tuning of the 4 vane model for q-value. • 4 rod design needs cooling and tuning. Ajit Kurup

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