Central solenoid for spherical tokamak GLOBUS-M

V. Gusev, Jukka Heikkinen, A. Helenius, S. Kivivuori, V. Korotkov, A. Panin, N. Sakharov, V. Shpeitman, V. Soikin, J. Somerkoski

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)


The central solenoid is a critical component of the spherical tokamak Globus-M (plasma major radius R = 0.36 m, plasma minor radius a = 0.24 m, aspect ratio R/a = 1.5, toroidal magnetic field BT ≤ 0.62 T, plasma current Ip ≤ 0.5 MA).
The two-layer solenoid, 1312 mm long with a 200-mm outer diameter, is located between the 112-mm-diam inner rod of the toroidal field coils and the 217-mm-diam inner cylinder of the vacuum vessel. Strong magnetic and thermal cyclic loads acting on the solenoid require that it be manufactured from a high-strength hollow conductor.
The conductor material selected for the solenoid winding is CuAg0,1(OF). Advanced manufacturing technology has made it possible to increase the continuous length of conductor (with an ~20 × 20 mm2 cross section) up to the 66 m that is required for Globus-M.
To verify the winding procedure, a one-sixth-length solenoid prototype has been constructed and tested with loads exceeding the design loads acting on the full-scale solenoid.
The tests included magnetic and strain measurements.
The results are in satisfactory agreement with structural analysis.
Original languageEnglish
Pages (from-to)137-146
JournalFusion Technology
Issue number2
Publication statusPublished - 1998
MoE publication typeA1 Journal article-refereed


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