Speaker
Description
CLARA is a 250 MeV/celectron beam user facility currently undergoing final beam commissioning at Daresbury Laboratory, in the UK. CLARA features a 4-dipole variable bunch compressor, allowing a wide range of R56 values up to 60 mm, coupled with an X-band fourth harmonic cavity (4HC) for longitudinal harmonic correction of the S-band main linacs. An S-band transverse deflecting cavity (TDC) situated in a diagnostic straight following the bunch compressor, coupled with a high-resolution spectrometer beamline, enables full transverse and longitudinal reconstruction of the beam phase space. The FEBE arc, which delivers beam to a dedicated user area, can also act as an additional variable longitudinal compressor, with R56 variation of ±50 mm possible with limited dispersion leakage, and with 2 sextupole families for T566 correction. A Coherent Transition Radiation (CTR) target is situated at the exit of the arc and can be used for longitudinal tuning. Commissioning of the various longitudinal compression and linearisation systems has recently taken place, to facilitate a first tranche of “friendly” user experiments, several with demanding requirements on the bunch length.
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