Fast-ion orbit origin of neutron emission spectroscopy measurements in the JET DT campaign

In the JET DTE2 deuterium-tritium campaign, neutron diagnostics were employed to measure 14 MeV neutrons originating from D(T,n)4He reactions. In discharge 99965, a diamond matrix detector (KM14) and a magnetic proton recoil (MPRu) detector with a vertical and an oblique line-of-sight were used, respectively. At the timepoints of interest, a significant decrease in the expected diagnostic signals can be observed as electromagnetic wave heating in the ion cyclotron range of frequencies (ICRF) is switched off. Utilizing only TRANSP simulation data, the fast-ion distribution is found to have been likely composed mostly of trapped orbits. In contrast, analysis performed using orbit weight functions revealed that the majority of neutrons in the KM14 <img src="https://content.cld.iop.org/journals/0029-5515/64/2/026015/revision2/nfad1a57ieqn1.gif?Expires=1707126744&Signature=Lw-MySxEHZ0m~~F54H3-7rTXE94J0p4XDW8YLJMHvTk5dGn6rm6whyLFmfZlO8KW5iw5Hf7EFvw81AGK9N~U7iY9aTgp4J4bC81hnGgtgRiVRVeYSAIwURvuBgbcmzFsq-FeUBiaKP~VRXCzyseLhUR2jqe31WINESCCSjOs7424nr8V22hEhB4XcERZD~dzsH6TvaOXOpmTUUxGhH75ttllTq3eLhFfiB4dnIeLfwrQahdkNRzc6E2oxUXaQrwcXg7K01AjcBy98dRY86W31cupXb6G-HS25~oeOhlvfuVdTciAOeOhQFe5rj11BeouvMjZv1opcuoraRxkMPxX6Q__&Key-Pair-Id=KL1D8TIY3N7T8" data-src="https://content.cld.iop.org/journals/0029-5515/64/2/026015/revision2/nfad1a57ieqn1.gif?Expires=1707126744&Signature=Lw-MySxEHZ0m~~F54H3-7rTXE94J0p4XDW8YLJMHvTk5dGn6rm6whyLFmfZlO8KW5iw5Hf7EFvw81AGK9N~U7iY9aTgp4J4bC81hnGgtgRiVRVeYSAIwURvuBgbcmzFsq-FeUBiaKP~VRXCzyseLhUR2jqe31WINESCCSjOs7424nr8V22hEhB4XcERZD~dzsH6TvaOXOpmTUUxGhH75ttllTq3eLhFfiB4dnIeLfwrQahdkNRzc6E2oxUXaQrwcXg7K01AjcBy98dRY86W31cupXb6G-HS25~oeOhlvfuVdTciAOeOhQFe5rj11BeouvMjZv1opcuoraRxkMPxX6Q__&Key-Pair-Id=KL1D8TIY3N7T8" /> MeV and MPRu <img src="https://content.cld.iop.org/journals/0029-5515/64/2/026015/revision2/nfad1a57ieqn2.gif?Expires=1707126744&Signature=gHe00iihghFuG-2BYp-01KzctWDSKuEdBHyffkSUakNWmXdzNOijSZ0qRQHJmkyoxNlsR4pkqj2pZF52S0SIaxN