Abstract
A spiral resonant cavity has been installed at Nuclear Science Centre to monitor the phase of the accelerated pulsed beam from the 15 UD Pelletron. The cavity, made of stainless steel, is optimised for particles with β 0 ∼ 0.08. The unloaded Q-factor of the cavity is ∼ 2000 at a resonant frequency of 48 MHz. The measured sensitivity of the cavity pickup for 161.5 MeV 58Ni pulsed beam is 5.9 μV (peak to peak) per nA of average beam current. The cavity signal can be used for average beam current down to 1 nA.
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