RFQ Integrated Design Would like to have a method of designing RFQ where all steps are integrated:...
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Transcript of RFQ Integrated Design Would like to have a method of designing RFQ where all steps are integrated:...
RFQ Integrated Design• Would like to have a
method of designing RFQ where all steps are integrated:– Engineering design.– EM modelling.– Beam dynamics
simulations.• Integrating design steps
allows us to characterise effects of:– Fringe fields and higher
order modes.– Limitations of current
modelling techniques.– Thermal and mechanical
stress limits.– Particular CNC machining
techniques and options on beam dynamics.
24/02/11 Simon Jolly, Imperial College London
1
RFQ Integrated Design Steps
24/02/11
RFQSIMInventor (CAD)
Comsol
GPT
Matlab
Integrate RFQSIM, Inventor, Comsol, GPT and Matlab
Excel
Matlab
2Simon Jolly, Imperial College London
CAD & E-field Modelling
• Electrostatic field mapping in Comsol almost complete:– Semi-automated modelling of individual
cells: almost fully automated, just working out the gremlins…
– Already produced high resolution field map from CAD model for beam dynamics simulations.
– Currently focusing on design of matching-in and -out sections.
• CAD modelling of vane tip modulations now complete:– Using values in Excel spreadsheet, possible to create arbitrary vane
modulation design up to 1,000 cells in less than a minute.– Vane tip modulation model already added to bulk FETS RFQ CAD model:
ready for machining.
24/02/11 Simon Jolly, Imperial College London
3
Beam Dynamics Simulations
24/02/11 Simon Jolly, Imperial College London
4
Energy Spread (60mA)
Transmission (60mA)
• Beam dynamics simulations carried out in GPT using field maps.
• For nominal 60mA beam, CAD-based field map gives very similar results to coefficient-based field map from RFQSIM (A. Letchford):– >92% transmission of particles above
2.9MeV.– Slight difference in energy spread and
transmission: CAD-based map gives better transmission at high currents!