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A new structure of superconducting magnetic system for 50 GHz operations (invited)a)
a)Invited paper, published as part of the Proceedings of the 14th International Conference on Ion Sources, Giardini Naxos, Italy, September 2011.
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Image of FIG. 1.
FIG. 1.

Layout of the classical magnet structure.

Image of FIG. 2.
FIG. 2.

Layout of the non-classical magnet structure.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

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.

Image of FIG. 7.
FIG. 7.

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).

Image of FIG. 8.
FIG. 8.

MK-I (NbTi) current loadings for operation frequency up to 50 GHz and comparison to SECRAL.

Image of FIG. 9.
FIG. 9.

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.

Image of FIG. 10.
FIG. 10.

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.

Image of FIG. 11.
FIG. 11.

Utilization of sextupole radial field profiles in MK-I and SECRAL plasma chambers.

Image of FIG. 12.
FIG. 12.

Maximum axial field produced by the MK-I (NbTi) sextupole alone. The slightly asymmetric field is caused by the asymmetric irons.


Generic image for table
Table I.

A few example beams produced with SECRAL and VENUS.

Generic image for table
Table II.

A few key parameters of MK-I and SECRAL.

Generic image for table
Table III.

A few parameters and comparison.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A new structure of superconducting magnetic system for 50 GHz operations (invited)a)