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Description
A S-band linac platform is designed as a dedicated testbed for validating angular dispersion-driven fully coherent radiation (ADM) and its modulation-demodulation scheme. The machine consists of a photoinjector, a laser-heater section, a chicane section and a S-band main linac, enabling multiple beam working points on a common lattice. In the baseline round-beam working point, the photoinjector delivers a near-round bunch at its exit with a charge of Q=0.25 nC and an energy of~110 MeV, which is accelerated in the main linac to~730 MeV. On the same beamline, a flat-beam working point is obtained by introducing an axial magnetic field near the gun and operating a small subset of injector quadrupoles as skew quadrupoles to remove canonical angular momentum, yielding at the injector exit a flat beam with a transverse emittance ratio of ~10. These two working points demonstrate that, with only local adjustments of a few injector magnets,a S-band linac can switch between a baseline round beam and a flat beam better adapted to ADM-oriented coherent-radiation experiments. In this work,the detailed physics design is described and the recent commissioning result is reported.
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