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Description
The High Intensity Proton Accelerator (HIPA) at the Paul Scherrer Institute (PSI) delivers a continuous-wave (CW) proton beam at a frequency of 50.63 MHz, with currents up to 2.2 mA and a maximum energy of 590 MeV. The beam is successively directed to two meson production targets before reaching the spallation target.
To monitor key beam parameters, various diagnostics based on the RF beam signal detection have been implemented. For beam intensity measurements, 11 resonators tuned at the second harmonic (101.26 MHz) have been deployed on the different beam lines. Capacitive probes in the cyclotrons provide the phase measurements; to improve the signal-to-noise ratio, the beam phase measurements are performed at the sixth harmonic. Beam energy is determined by extracting phase information from signals obtained via beam current monitors positioned along the beamline. In additional, a cross-correlation technique applied to phase pick-up signals at the entry and exit points of the cyclotron, enables a precise determination of the number of turns completed by the beam.
Beam alignment on a rotating target is monitored using a novel fin-and-groove structure engraved on the target surface. The resulting intensity modulation, measured with a downstream beam current monitor, is analyzed in the frequency domain to directly infer the beam offset on target.
Details of each diagnostic system, their implementation, and performance will be presented.
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