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Single crystal diamond detectors are under consideration for neutron measurements in the neutron camera of high performance fusion devices, such as ITER. Being compact, insensitive to magnetic fields and gamma-ray background, they offer advantages with respect to the more conventionally used liquid scintillators, also in terms of their better resilience to neutron damage. An additional feature is offered by their intrinsic high energy resolution (at the level of a few %), which may enable spectroscopy measurements along multiple line of sights, complementing the information attainable by a non compact, dedicated neutron spectrometer on a single line of sight. In this work we present a selection of neutron spectroscopy measurements with a single crystal diamond detector performed at JET in the recent experimental campaigns (2013-2014). After a brief introduction on the instrumentation, examples of neutron spectra measured in plasmas heated with neutral beam injection and radio-frequency waves are presented and their shapes interpreted in terms of the energy distribution of fast deuterons accelerated by the auxiliary heating. Prospects for future neutron measurements in JET deuterium-tritium plasmas using diamond detectors are finally addressed.

Neutron emission spectroscopy measurements with a single crystal diamond detector at JET