  We propose a new type of high temperature superconducting (HTS) conductor
concept: modularized conductors (MC) connected by Chinese traditional tenon
mortise (TM) connection structure, reffered as TMMC. The conductor consists of
multiple concentric round sub conductors with slots for stacking REBCO tapes.
Innovatively, the REBCO stacks in the adjacent sub conductors are arranged with
the fully misaligned configuration to enhance the critical current' s isotropy
with respect to magnetic field and reduce ac loss. For example, the angle
between the adjacent stacks in the two adjacent sub conductors is 45 degree if
each subconductor contains 4 REBCO stacks. In order to construct the fully
misaligned configuration, the sub conductors are designed with two open half
circular formers and connected by tenonmortise structure which makes the
conductor modulrized and simply to assembly and disassembly. Based on the
design concept, a prototype conductor containing 160 REBCO tapes distributed in
the four concentric sub conductors is fabricated. The conductor measured
critical current is 13.69 kA at 77 K and sefl field, which is consistent to the
simulaiton result. In order to further improve the TMMC' s engineering critical
current density (Jce) and bending performance, we propose two enhancement
approaches which are reducing the former' s thickness and rearrange stacks in
the outer sub conductors. With the enhancements, both TMMC' s radius and Jce
are comparable to the existing slotted core conductor. The study shows the
TMMC' s advantages of nontwisted structures, easy assembly, high current
carrying and low ac losses, which makes it promising for constructing large
scale scientific devices.
