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A Beam Profile Monitor for Rare Isotopes in Accelerator Mass Spectrometry: Preliminary Measurements

  • F Taccetti (a1), L Carraresi (a1), M E Fedi (a1), M Manetti (a1), P Mariani (a1), G Tobia (a1) and P A Mandò (a1)...

Abstract

In accelerator systems, beam lines are generally equipped with diagnostic elements, such as Faraday cups and beam profile monitors (BPM), to optimize beam transport. These diagnostic elements, or at least commercial ones, are designed to only work with continuous beams, and their typical maximum sensitivity is about few tens of pA. Thus, in the case of diagnosis of rare isotope beams in accelerator mass spectrometry (AMS), Faraday cups and BPMs are not suitable on the high-energy side of the tandem accelerator, after energy-mass-charge analysis. For example, in 14C AMS, even for a modern sample, the expected counting rate is a few tens of Hz; in these conditions, a commercial BPM cannot be used. On the other hand, checking the shape and the position of the rare isotope beam hitting the detector can be important in order to better identify signals in the detector itself, thus also helping in reducing the measurement background.

This paper presents a prototype BPM especially designed for low-intensity beams. The BPM is based on a multiwire proportional chamber characterized by 2 grids of anode wires, oriented perpendicular to each other in order to measure both the x and the y coordinates of the particle impact point. Details about the design and the electronics of the device are given, and the first test measurements are discussed.

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Copyright

Corresponding author

Corresponding author. Email: fedi@fi.infn.it

References

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Charpak, G, Sauli, F. 1979. Multiwire proportional chambers and drift chambers. Nuclear Instruments and Methods 162(1–3):405–28.
Fedi, ME, Cartocci, A, Manetti, M, Taccetti, F, Mandò, PA. 2007. The 14C AMS facility at LABEC, Florence. Nuclear Instruments and Methods in Physics Research B 259(1):1822.
Mandò, PA. 2009. INFN-LABEC, nuclear techniques for cultural heritage and environmental applications. Nuclear Physics News 19(1):512.
Mirto, FA, Carraresi, L. 2007. The pulsed beam facility at the Tandetron accelerator in Florence. Nuclear Instruments and Methods in Physics Research B 266(10):2113–6.
Taccetti, N, Poggi, G, Carraresi, L, Bini, M, Casini, G, Ciaranfi, R, Giuntini, L, Maurenzig, PR, Montecchi, M, Olmi, A, Pasquali, G, Piantelli, S, Stefanini, AA. 2003. Linear electronics for Si-detectors and its energy calibration for use in heavy ion experiments. Nuclear Instruments and Methods in Physics Research A 496(2–3):481–95.

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