14-16 March 2016
INFN Laboratori Nazionali di Legnaro
Europe/Rome timezone

High current storage rings for neutral beam injectors

14 Mar 2016, 16:35
2h 40m
Cafeteria Hall (INFN Laboratori Nazionali di Legnaro)

Cafeteria Hall

INFN Laboratori Nazionali di Legnaro

Speaker

Marco Cavenago (INFN-LNL)

Description

The gas neutralizer converter used to produce a neutral hydrogen (or deuterium) beam from a H- (or D-) beam has intrinsic limitation on conversion efficiency and requires a residual ion dump for H-, and produced H+. By recirculating H- into gas neutralizer N times (with N up to 4) conversion efficiency can be increased and the ion dump size is greatly reduced. In other words, the gas neutralizer becomes one element of a large acceptance H- storage ring, which is here studied both with linear theory and with numerical simulation. Among several practical solutions, the rectangular lattice with M=2 and M=4 bending dipole seems the more convenient for an initial studies; symmetry number (number of equal section per turn) is S=2 for both lattices. It is important to control secondary ion accumulation inside storage rings, which has beneficial effect (reduction of space charge) and unwanted effects (beam stripping in dipoles); clearing electrodes may be useful. Among advanced concepts, note first that controlling secondary plasma may also produce a plasma neutralizer, with higher efficiency. Second, adding a H+ storage ring, with a long straight section in common, is a convenient method to exploit the H+ and H- mutual neutralization, so that in principle conversion effiency may approach unity. Application to fusion and other use of dual beam technology are also reviewed.
If a proceedings is prepared,<br></br> will you submit a contribution? no

Primary author

Marco Cavenago (INFN-LNL)

Co-authors

Emanuele Sartori (Consorzio RFX, Eurofusion) Gianluigi Serianni (Consorzio RFX) Piergiorgio sonato (Consorzio RFX) Pierluigi Veltri (INFN-LNL) Vanni antoni (Consorzio RFX, CNR)

Presentation Materials

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