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

Emanuele Sartori, Pierluigi Veltri, Mauro Dalla Palma, Piero Agostinetti, Ronald Hemsworth, Mahendrajit Singh, Gianluigi Serianni

Research output: Contribution to journalArticle

3 Citations (Scopus)


The operation of neutral beam injectors for plasma heating and current drive in a fusion device provides challenges in the thermal management of beamline components. Sensitive components such as the cryogenic pumps at beamline periphery shall be protected from the heat flux due to stray electrons. These are emitted by the negative ion accelerator or generated along the beamline by interaction of fast electrons, ions or atoms with background gas and surfaces. In this article the case of the ITER Heating Neutral Beam (HNB) and its test facility MITICA is discussed, for which the beam parameters and the required pulse length of one hour is a major leap forward with respect to the present experience with neutral beam systems. The engineering solutions adopted for effective cryopump protection against the heat load from electrons are described. 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 solutions were optimized to minimize the impact on gas pumping and on the functionality of other components.
Original languageEnglish
Pages (from-to)377 - 382
Number of pages6
JournalFusion Engineering and Design
Publication statusPublished - 1 Nov 2016
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Civil and Structural Engineering
  • Mechanical Engineering

Cite this

Sartori, E., Veltri, P., Dalla Palma, M., Agostinetti, P., Hemsworth, R., Singh, M., & Serianni, G. (2016). Solutions to mitigate heat loads due to electrons on sensitive components of ITER HNB beamlines. Fusion Engineering and Design, 109-111, 377 - 382.