Layout of the classical magnet structure.
Layout of the non-classical magnet structure.
A view of the VENUS sextupole end turns. Interaction with the axial fields results in strong radially outward W1 and inward W2 forces due to the opposite end turn currents.
Possible combinations of a set of two related components of A (solenoids) and B (sextupole). The partial overlap of A and B is the only remaining combination (c) not yet being used in ECRISs.
Layout of the new magnet structure in which the injection solenoid sits inside and the middle and extraction solenoids sit outside the close-loop sextupole magnet.
Schematic views of the sextupole Ioffe bars constructed with combined racetrack coils (a) and rectangles (b). The red dots represent the line currents. D and d are the distances from the line current centrals to the magnet gap surfaces.
Cross-sectional views of the cold iron enclosed MK-I magnet with a stepped and partial hexagonal warm bore and a plasma chamber (enlarged for better viewing).
MK-I (NbTi) current loadings for operation frequency up to 50 GHz and comparison to SECRAL.
The axial field profiles generated by the new magnet structure MK-I. The maximum axial field reaches 7.0 T for NbTi and 12.0 T for Nb3Sn wires at the injection, respectively.
The central radial field profiles inside the maximum plasma chamber generated by the MK-I magnet structure with NbTi and Nb3Sn wires. Up to 3.7 T for NbTi and 6.0 T for Nb3Sn wires can be achieved.
Utilization of sextupole radial field profiles in MK-I and SECRAL plasma chambers.
Maximum axial field produced by the MK-I (NbTi) sextupole alone. The slightly asymmetric field is caused by the asymmetric irons.
A few example beams produced with SECRAL and VENUS.
A few key parameters of MK-I and SECRAL.
A few parameters and comparison.
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