The compact neutron spectrometer at ASDEX Upgrade

L. Giacomelli, A. Zimbal, K. Tittelmeier, H. Schuhmacher, G. Tardini, R. Neu

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The first neutron spectrometer of ASDEX Upgrade (AUG) was installed in November 2008. It is a compact neutron spectrometer (CNS) based on a BC501A liquid scintillating detector, which can simultaneously measure 2.45-MeV and 14-MeV neutrons emitted from deuterium (D) plasmas and γ radiation. The scintillating detector is coupled to a digital pulse shape discrimination data acquisition (DPSD) system capable of count rates up to 106s-1. The DPSD system can operate in acquisition and processing mode. With the latter n-γ discrimination is performed off-line based on the two-gate method. The paper describes the tests of the CNS and its installation at AUG. The neutron emission from the D plasma measured during a discharge with high auxiliary heating power was used to validate the CNS performance. The study of the optimal settings for the DPSD data processing to maximize the n-γ discrimination capability of the CNS is reported. The CNS measured both 2.45-MeV and 14-MeV neutrons emitted in AUG D plasmas with a maximum count rate of 5.4 ×105s-1(≥10 times higher than similar spectrometers previously achieved) with an efficiency of 9.3 × 10-10events per AUG neutron. © 2011 American Institute of Physics.
Original languageEnglish
Article number123504
Pages (from-to)-
JournalReview of Scientific Instruments
Issue number12
Publication statusPublished - Dec 2011
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Giacomelli, L., Zimbal, A., Tittelmeier, K., Schuhmacher, H., Tardini, G., & Neu, R. (2011). The compact neutron spectrometer at ASDEX Upgrade. Review of Scientific Instruments, 82(12), -. [123504].