Speaker
Description
The RF-focused interdigital (RFI) linac combines longitu-
dinal acceleration and transverse RF quadrupole focusing in
a compact IH-type cavity without embedded magnets. In a
multicell RFI cavity, fringe fields and phase dependent focus-
ing make simplified beam dynamics models difficult to map
reliably onto the final three-dimensional geometry. A staged
electromagnetic beam dynamics optimization framework is
therefore established by integrating Python reference par-
ticle calculations, CST three-dimensional electromagnetic
simulations, and TraceWin multiparticle tracking. The lon-
gitudinal stage corrects the axial gap and drift tube layout
through phase feedback in the recalculated field, whereas the
transverse stage varies the focusing geometry under trans-
mission, aperture, mismatch, and emittance criteria. For the
200 MHz model, the present longitudinal candidate reaches
3.3038 MeV, while the transverse candidate gives 97.48 %
transmission. Common geometry verification remains in
progress.
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