title: Comparative study of beam losses and heat loads reduction methods in MITICA beam source.
abstract: In negative ion electrostatic accelerators a considerable fraction of extracted ions is lost by collision processes causing efficiency loss and heat deposition over the components. Stripping is proportional to the local density of gas, which is steadily injected in the plasma source; its pumping from the extraction and acceleration stages is a key functionality for the prototype of the ITER Neutral Beam Injector, and it can be simulated with the 3D code AVOCADO. Different geometric solutions were tested aiming at the reduction of the gas density. The parameter space considered is limited by constraints given by optics, aiming, voltage holding, beam uniformity, and mechanical feasibility. The guidelines of the optimization process are presented together with the proposed solutions and the results of numerical simulations.
authors.affiliation: Consorzio RFX, Euratom-ENEA association, C.so Stati Uniti 4, 35127 Padova, Italy.
authors.forename: E
authors.initials: E
authors.lastname: Sartori
authors.affiliation: Consorzio RFX, Euratom-ENEA association, C.so Stati Uniti 4, 35127 Padova, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Agostinetti
authors.affiliation: Consorzio RFX, Euratom-ENEA association, C.so Stati Uniti 4, 35127 Padova, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Dal Bello
authors.affiliation: Consorzio RFX, Euratom-ENEA association, C.so Stati Uniti 4, 35127 Padova, Italy.
authors.forename: D
authors.initials: D
authors.lastname: Marcuzzi
authors.affiliation: Consorzio RFX, Euratom-ENEA association, C.so Stati Uniti 4, 35127 Padova, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Serianni
authors.affiliation: Consorzio RFX, Euratom-ENEA association, C.so Stati Uniti 4, 35127 Padova, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Sonato
authors.affiliation: Consorzio RFX, Euratom-ENEA association, C.so Stati Uniti 4, 35127 Padova, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Veltri