Title: Artificial diamonds as radiation-hard detectors for ultra-fast fission-fragment timing
Authors: OBERSTEDT StephanBORCEA RuxandraBRYS TOMASZGAMBONI ThierryGEERTS WouterHAMBSCH Franz-JosefOBERSTEDT AndreasVIDALI Marzio
Citation: NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT vol. 714 p. 31-37
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2013
JRC N°: JRC73556
ISSN: 0168-9002
URI: http://dx.doi.org/10.1016/j.nima.2013.02.029
http://publications.jrc.ec.europa.eu/repository/handle/JRC73556
DOI: 10.1016/j.nima.2013.02.029
Type: Articles in periodicals and books
Abstract: In the framework of the construction of the double time-of-flight spectrometer VERDI, where we aim at measuring pre- and post-neutron masses directly and simultaneously, ultra-fast time pick-up detectors based on artificial diamond material were investigated for the first time with low-energy heavy ions produced in fission(0.5 MeV/u < E/A < 2 MeV/u). Signal stability under a high radiation dose was determined up to at least 10^9 fission fragments together with more than 3.5 x 10^9 neutrons and 3 x 10^10 alpha-particles. These doses are characteristic for fission experiments. The intrinsic timing resolution of a 100 micron thick polycrystalline CVD diamond detector with a size of 1 x 1 cm^2 was determined to sigma_{int} = (283 +- 41) ps by comparison with Monte-Carlo simulations. Using broadband pre-amplifiers, 4-fold segmented detectors of same total size and with a thickness of 180 micron show an intrinsic timing resolution of sigma_{int} = (124 +- 32) ps. This is highly competitive with the best micro-channel plate detectors. Due to the limited and batch-dependent charge collection efficiency of polycrystalline diamond material, the detection efficiency for fission fragments may be smaller than 100%. This restriction will no longer be an issue when detectors made from single-crystal diamonds are used.
JRC Directorate:Health, Consumers and Reference Materials

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