Challenges with localized plasma rotation and momentum transport analysis under heating and current drive conditions

Investigation of the localized effects of ICRH (Ion Cyclotron Resonance Heating), LHCD (Lower Hybrid Current Drive), and ECRH (Electron Cyclotron Resonance Heating) to plasma rotation and momentum transport in magnetically confined plasmas poses inherent difficulties due to the lack of understanding on the actual torque amount being locally deposited. There are no proven analytic models to simulate such effects in fusion plasmas and diagnostics must provide a sufficient accuracy in the affected local area measurements as well. Given reliable velocity profile measurements, there are possibilities of investigating their localized effects to plasma rotation and momentum transport. In this work, a forward and a backward calculation schemes to predict the localized torque density are presented and discussed.