High-rate axial-field ionization chamber for particle identification of radioactive beams

Abstract : The design, construction and performance characteristics of a simple axial-field ionization chamber suitable for identifying ions in a radioactive beam are presented. Optimized for use with low-energy radioactive beams View the MathML source(<5MeV/A) the detector presents only three 0.5 µm/cm2 foils to the beam in addition to the detector gas. A fast charge sensitive amplifier (CSA) integrated into the detector design is also described. Coupling this fast CSA to the axial field ionization chamber produces an output pulse with a risetime of 60–70 ns and a fall time of 100 ns, making the detector capable of sustaining a relatively high rate and providing a time resolution of 6–8 ns. Tests with an α source establish the detector energy resolution as ∼8%∼8% for an energy deposit of ∼3.5 MeV. The energy resolution with beams of 2.5 and 4.0 MeV/A 39K ions and the dependence of the energy resolution on beam intensity is measured. At an instantaneous rate of 3×105 ions/s the energy resolution has degraded to 14% with a pileup of 12%. The good energy resolution of this detector at rates up to 3×105 ions/s makes it an effective tool in the characterization of low-energy radioactive beams.
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Contributor : Michel Lion <>
Submitted on : Friday, September 16, 2016 - 8:25:09 AM
Last modification on : Thursday, February 1, 2018 - 1:35:42 AM

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J. Vadas, Varinderjit Singh, G. Visser, A. Alexander, S. Hudan, et al.. High-rate axial-field ionization chamber for particle identification of radioactive beams. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, 2016, 837, pp.28-33. ⟨10.1016/j.nima.2016.08.056⟩. ⟨in2p3-01367369⟩

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