Neutron and photon spectrometry with liquid scintillation detectors in mixed fields

The compact neutron spectrometer at ASDEX Upgrade

“…The CNS provides an integral measurement of the detected events, which results in a continuous PHS up to the maximum energy deposited in the scintillating liquid. Unfolding techniques and an accurate knowledge of the response function are necessary to determine the correspondent neutron energy spectra [11]. The full characterization of the CNS, i.e., the determination of its response function, will be performed at a later stage of the project.…”

“…MeV in the CNS detector, respectively [11]. Their positions provide useful information for setting the working points of the spectrometer (i.e., the HV of the PMT) and for defining the energy calibration.…”

“…The full characterization of the CNS will be obtained at a later stage by exposing the instrument to well-defined neutron beams in terms of energy and fluence at the PTB accelerator. This will make the measurement of the CNS response function possible which will then be use to unfold the neutron PHS to extract the correspondent neutron energy spectrum [11]. From the fit, the resolution in terms of full width at half maximum (FWHM) is calculated [16].…”

“…From the fit, the resolution in terms of full width at half maximum (FWHM) is calculated [16]. Typical values for the resolution of the The values for the detector described in [11] using this method are 28 % for the first The CNS goal is the study and interpretation of the ion velocity distribution of the reactants that give rise to the measured 2.45-MeV neutron PHS. Since tritons are also produced in D plasmas discharges at 1 MeV energy, they can react with deuterons in t(d,n)α (about 100 % branching ratio) and produce neutrons of energy > 14.03 MeV.…”

“…Particularly, the neutron PHS is the one of interest since it contains the spectroscopic information, which is extracted using the CNS response function and data unfolding techniques [11]. The C&M data correction makes use of the average LED pulse area With N o * = 5 samples for the offset reduction and ∆t = 100 ms for the LED correction of the data, the analysis of AUG discharge 24151 was carried out to determine the optimal S-L gate combination that maximizes the n-γ discrimination [21] [22].…”