Solutions to mitigate heat loads due to electrons on sensitive components of ITER HNB beamlines

This report presents the solutions adopted for effective cryopump protection against the heat load from electrons in MITICA and ITER HNB. The use of three - dimensional numerical simulations of particle trajectories in the complex geometry of the beamline was needed for the quantitative estimations of the heat loads. The presented design solutions were optimized to minimize the impact on gas pumping and on the functionality of other components ; t he results of this work were applied to the CAD design development of the neutralizer. The report consists of one annexed document, which is the manuscript presented at ISFNT (International Symposium on Fusion Nuclear Technology) conference held in September 2015, and submitted to Fusion Engineering and Design journal.