Speaker
Description
We present calculations of the orbit-space sensitivity of two-step reaction gamma-ray spectroscopy diagnostics, with arbitrary line-of-sight in toroidally symmetric magnetic equilibria. We consider the two-step reaction between alpha particles and beryllium-9, generating a neutron and an excited carbon-12, the latter of which then decays emitting an MeV photon. We show how the kinematics of this process influences the diagnostic sensitivity, and how this relates to experimentally obtained spectra. Each synthetic spectrum is calculated orbit-wise, and each orbit, in a toroidally symmetric tokamak, is described via the triplet of energy 'E', pitch value 'pm' at the maximum major radius position 'Rm', and 'Rm'. Given the high dimensionality of the task, we also show how neglecting the velocity of the thermal beryllium leads to an analytical solution that well approximates the same results and requires less computational power, i.e. an alternative route to standard Monte Carlo methods.
| Presentation type | Oral |
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