Characterisation of CVD diamond detectors used for fast neutron flux monitoring |
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| Affiliation: | 1. LETI (CEA-Technologies Avancées)/DEIN/SPE, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France;2. Troitsk Institute for Innovation and Fusion Research, TRINITI, RU-142092 Troitsk, Moscow Region, Russia;1. Centre for Medical Radiation Physics, University of Wollongong, Northfields Avenue, Gwynneville, New South Wales, 2500, Australia;2. Illawarra Health and Medical Research Institute, University of Wollongong, Northfields Avenue, Gwynneville, New South Wales, 2500, Australia;1. INFN Torino, Via Pietro Giuria 1, Torino, Italy;2. HEPHY Vienna, Austria;3. University of California, Santa Cruz, United States;1. Dip. Di Fisica, Università degli Studi di Genova, Italy;2. INFN, Sezione di Genova, Italy;3. Dip. Di Fisica, Università degli Studi di Torino, Italy;4. INFN, Sezione di Torino, Italy;1. Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom |
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| Abstract: | Natural diamond detectors (NDD) have been successfully used for fast neutron spectrometry on various fusion installations in plasma diagnostics. These detectors can work at high temperature, are radiation hard and exhibit a high energy resolution. However, the use of NDD is limited by the availability of IIa type diamonds exhibiting high electronic properties. With the recent advance in the growth of high quality chemically vapour deposited (CVD) diamond at LETI, CVD diamond appears to be a very promising material for plasma diagnostics. We present here for the first time results of the use of CVD diamond detectors for fast neutron flux monitoring on a neutron generator. The characteristics of CVD diamond detectors are compared with that of high quality NDD made by TRINITI. Pulse height spectra have been measured with CVD detectors and NDD under both 5.5 MeV alpha particles and 14.1 MeV neutrons. The quality of CVD diamond enables the recording of structured spectra allowing the distinction between the different neutron reactions on carbon. The efficiency of CVD diamond monitors and their actual limitations are analysed and discussed. |
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