A large 4π array of charged particle detectors has been developed at Variable Energy Cyclotron Centre to facilitate high resolution charged particle reaction and spectroscopy studies by detecting event-by-event the charged reaction products emitted in heavy ion reactions at energy ∼ 10-60 MeV/A. The forward part (θ ∼ ± 7 0 -±45 0 ) of the array consists of 24 highly granular, high resolution charged particle telescopes, each of which is made by three layers [single sided silicon strip(∆E) + double sided silicon strip (E/∆E) + CsI(Tl)(E)]of detectors. The backward part of the array consists of 112 CsI(Tl) detectors which are capable of detecting primarily the light charged particles (Z ≤ 2) emitted in the angular range of θ ∼ ± 45 0 -±175 0 . The extreme forward part of the array (θ ∼ ± 3 0 -±7 0 ) is made up of 32 slow-fast plastic phoswich detectors that are capable of detecting light (Z ≤2) and heavy charged particles (3 ≤ Z 20) as well as handling high count rates. The design, construction and characterization of the array has been described.
In an isochronous cyclotron, measurements of central phase of the ion beam with respect to rf and the phase width provide a way to tune the cyclotron for maximum energy gain per turn and efficient extraction. We report here the development of a phase measurement system and the measurements carried out at the Variable Energy Cyclotron Centre's (VECC's) K = 500 superconducting cyclotron. The technique comprises detecting prompt γ-rays resulting from the interaction of cyclotron ion beam with an aluminium target mounted on a radial probe in coincidence with cyclotron rf. An assembly comprising a fast scintillator and a liquid light-guide inserted inside the cyclotron was used to detect the γ-rays and to transfer the light signal outside the cyclotron where a matching photo-multiplier tube was used for light to electrical signal conversion. The typical beam intensity for this measurement was a few times 10(11) pps.
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