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Title: Ion collector design for an energy recovery test proposal with the negative ion source NIO1

Commercial viability of thermonuclear fusion power plants depends also on minimizing the recirculation power used to operate the reactor. The neutral beam injector (NBI) remains one of the most important method for plasma heating and control. For the future fusion power plant project DEMO, a NBI wall plug efficiency at least of 0.45 is required, while efficiency of present NBI project is about 0.25. The D{sup −} beam from a negative ion source is partially neutralized by a gas cell, which leaves more than 40% of energy in residual beams (D{sup −} and D{sup +}), so that an ion beam energy recovery system can significantly contribute to optimize efficiency. Recently, the test negative ion source NIO1 (60 keV, 9 beamlets with 15 mA H{sup −} each) has been designed and built at RFX (Padua) for negative ion production efficiency and the beam quality optimization. In this paper, a study proposal to use the NIO1 source also for a beam energy recovery test experiment is presented and a preliminary design of a negative ion beam collector with simulations of beam energy recovery is discussed.
Authors:
 [1] ;  [2] ; ; ;  [3]
  1. INFN-BA, Via Orabona 4, I-70125 Bari (Italy)
  2. INFN – LNL, viale dell’Università 2, I-35020 Legnaro (PD) (Italy)
  3. Consorzio RFX, Corso Stati Uniti 4, I-35127 Padova (Italy)
Publication Date:
OSTI Identifier:
22482970
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ANIONS; DESIGN; EFFICIENCY; ENERGY RECOVERY; ION BEAMS; KEV RANGE 10-100; PLASMA HEATING; SIMULATION; THERMONUCLEAR POWER PLANTS