European design of a neutral beam injector module for ITER
The main design points of the European Community proposal for an injector module suitable for ITER are described. Such a module has to deliver 8.3 MW of 1.3 MeV D(0) to the plasma for very long pulses, up to 2 weeks in duration. The design takes as starting assumptions the use of a pure volume D(-) source, an electrostatic accelerator, and a D(2) gas neutraliser. Subdivision of the neutraliser reduces the total gas flow, which, combined with differential pumping at the source, minimises the required cryo pump speed. The combined in-line electrostatic residual ion deflector and dump are also subdivided, which reduces the required deflection angle and electric field. The expected power densities on all components except the beamline calorimeter are relatively low, permitting the use of conventional cooling technology, giving good inherent safety and long component lifetime. The beamline calorimeter, where the expected power density is less than 7 MW/m2, is not exposed continuously to the beam, and such power densities are readily handled by a variety of technologies.
Bibliographic Reference: Paper presented: 6th Symposium on the Production and Neutralisation of Negative Ions, Brookhaven (US), November 9-13, 1992
Availability: Available from (1) as Paper EN 37025 ORA
Record Number: 199211522 / Last updated on: 1994-11-29
Original language: en
Available languages: en