Y. BYLINSKY, A. M. LOMBARDI, W. PIRKL (CERN, Geneva, Switzerland)
The RFQD is designed to decelerate antiprotons of momentum 100 MeV/c (kinetic energy 5.3 MeV) down to a kinetic energy between 10 keV and 120 keV. Inside the RFQ body at ground potential the RF structure of the four-rod type is mounted on insulating supports. It can be biased between plus/minus 55 kV DC to achieve the continuous adjustment of the output energy required by the ASACUSA experiment. Two separate RF cavities mounted upstream provide bunching and input energy correction of the beam. Non-interceptive diagnostics monitor the beam continuously during operation: alternatively, two Faraday cups are provided for temporary insertion. A separate measurement line, using a rudimentary 20-degree spectrometer magnet, has been set up to assess the parameters of the decelerated beam with protons at the tandem accelerator of the 'Institut for Fysikn in Aarhus/Denmark'. The different parts of the RFQD system are described and measurement results presented.
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