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Title: Comparative study of beam losses and heat loads reduction methods in MITICA beam source

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:
; ; ; ; ;  [1] ;  [1] ;  [2]
  1. Consorzio RFX, Euratom-ENEA association, C.so Stati Uniti 4, 35127 Padova (Italy)
  2. (Italy)
Publication Date:
OSTI Identifier:
22254091
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 2; Conference: ICIS 2011: 14. international conference on ion sources, Giardini-Naxos, Sicily (Italy), 12-16 Sep 2011; Other Information: (c) 2013 Euratom; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANIONS; COMPUTERIZED SIMULATION; ELECTRIC POTENTIAL; ELECTROSTATIC ACCELERATORS; HEATING LOAD; ION BEAMS; ITER TOKAMAK; LIMITING VALUES; PLASMA ACCELERATION; PLASMA DENSITY; REDUCTION; STRIPPING