TITLE:
Elaboration of a Promising Design of the HTS Conductor for the Central Solenoid of a Compact Thermonuclear Reactor TRT
AUTHORS:
Victor Sytnikov, Sergey Lelechov, Vasiliy Zubko
KEYWORDS:
Central Solenoid, Conductor Design, Operating Current, HTS Tapes, Magnetic Field Distribution
JOURNAL NAME:
Engineering,
Vol.14 No.10,
October
28,
2022
ABSTRACT: The results of the preliminary development of the HTS conductor based on
the VS-type design and parallel stacks for the central solenoid of the compact thermonuclear reactor TRT are presented. One of
the main problems that need to be solved for the
successful implementation of such projects is the creation of high-current
high-temperature superconducting (HTS) conductors for Toroidal Field coils (TF)
and Central Solenoid (CS) sections. The conductor must have a high engineering
current density of at least 90 A/mm2. The induction of the magnetic
field in the central solenoid reaches 14 T, which leads to the occurrence of
large mechanical stresses due to the influence of Lorentz forces. Like many
large magnets, CS has a lot of stored energy. For the safe withdrawal of stored energy from the magnet, it
requires the inclusion of elements in the conductor that provide an
acceptable level of electrical voltage and heating of the conductor insulation.
Thus, a sufficient amount of stabilizing and reinforcing materials should be
placed in the conductor. In addition, the
“cable-in-conduit” type of conductor must have channels for pumping the refrigerant. Two fundamentally different
versions of the conductor based on radially arranged REBCO tapes and on the
basis of pre-assembled tape packages are considered. Based on the
analysis of the magnetic field distribution in the conductor by finite element
method, the design characteristics of the proposed conductors under various
operating modes of the electromagnetic system (EMS) of the tokamak TRT was
evaluated. The results of the evaluation of the current carrying capacity of
the conductor and the estimation of energy
losses in a changing magnetic field in comparison with known methods are
also presented.