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Description
We present a multi-frequency kicker design based on the superposition of a fundamental frequency and its third harmonic. This multi-harmonic configuration can introduce additional flexibility in shaping the RF field profile across the central region of the bunch compared to a single-frequency kicker. As a result, it can be applied to applications that require tailored longitudinal and transverse couplings. One of the primary applications under consideration is efficient tail removal with preserving core beam quality for beams injected into the ATLAS Positive Ion Injector (PII) linac at Argonne National Laboratory. Presently, satellite bunches formed after the RFQ, are lost in PII and can initiate quench in downstream superconducting solenoids and significantly limit the performance. Although a single-frequency kicker can remove these satellite bunches, it introduces strong transverse-to-longitudinal coupling that degrades the beam quality and causes particle loss downstream. The proposed multi-harmonic kicker can provide additional control over this coupling and enable effective removal of satellite bunches while preserving the core beam quality. Beam dynamics studies were carried out using TRACK3D simulations using electromagnetic field maps generated in CST.
| Working group | WG5 |
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