Development of ITER Toroidal Field Coil in Japan Hemmi, Tsutomu; Matsui, Kunihiro; Kajitani, Hideki ...
IEEE transactions on applied superconductivity,
2017-June, 2017-6-00, Letnik:
27, Številka:
4
Journal Article
Recenzirano
Full-scale trials were performed to qualify and optimize the manufacturing procedure of the toroidal field (TF) coil prior to the series production. In the full-scale trials, winding, reaction ...heat-treatment, conductor transfer, insulation, and cover plate (CP) welding trials were performed to resolve some technical issues and to demonstrate the fabrication procedure. Major requirements are: high accuracy conductor winding of 0.01%; the evaluation of the conductor elongation due to the reaction heat-treatment; the conductor transfer in a radial plate groove without adding more than 0.1% strain to the conductor; the conductor insulation without breakage of the insulation tape; and the flatness of 2 mm of the double pancake (DP) by CP welding. Then, the first TF coil fabrication has been started from March 2014. In this paper, the progress of the series production of TF coils in Japan is reported.
•High accuracy conductor winding of 0.1% was achieved in TF coil fabrication.•Conductor elongation due to heat treatment satisfied with the expected value of 0.06%±0.02%.•Commissioning of a transfer ...tooling without adding strain to conductor was completed.•Commissioning of a conductor insulation and CP welding was successfully completed.
JAEA performed full-scale trials to qualify and optimize manufacturing procedure of TF coil fabrication prior to series production. In the full-scale trials, conductor winding, heat treatment, conductor transfer, conductor insulation and cover plate (CP) welding trials were performed to resolve some technical issues and to demonstrate the fabrication procedure. The followings are major achievement. (1) High accuracy conductor winding of 0.01%, (2) the evaluation of 0.06% conductor elongation due to heat treatment, (3) conductor transfer in a radial plate (RP) groove with addition strain under 0.1%, (4) conductor insulation without breakage of the insulation tape and (5) flatness of 2mm of the double pancake (DP) by CP welding. Then JAEA started the 1st TF coil fabrication from March 2014, and has already completed ten conductor windings and heat treatment of nine windings.
In recent years, the tilting vehicle of air spring type, which uses air springs as the car-body tilt mechanism, has been employed even for Shinkansen trains to speed up on curved sections. On the ...test train with the tilt mechanism running at the speed of about 300km/h, however, it was found that the car-body roll and lateral vibrations increased in a compound curve where plane and vertical curves were overlapping. In this study, with an analytical model of the tilting vehicle of air spring type, numerical simulation is carried out to investigate the high-speed curving behavior in the compound curve. Then, anti-roll damper, which is equipped between the car-body and the existing anti-roll device, is examined as a counter measure. As a result, it is shown that the vibration phenomena occurred in compound curves is caused by the centrifugal force due to the vertical curve and the unbalanced stiffness between the right and left air springs for the car-body tilting, and that the anti-roll damper has a potential to reduce the car-body vibration increased in the compound curve.
In recent years, air-spring-type tilting vehicles, which use air springs as the car-body tilt mechanism, have been employed, even in Shinkansen trains, to increase the operation speed on curved ...sections. On a test train running at a speed of about 300 km/h with the tilt mechanism, however, it was found that the car-body roll and lateral vibrations increased in compound curves where the plane and vertical curves overlapped. In this study, an analytical model of the air-spring-type tilting vehicle is developed, and a numerical simulation is carried out to clarify the high-speed curving behavior in a compound curve. Then an antiroll damper, which is installed between the car-body and the existing anti-rolling device, is examined as a countermeasure to reduce car-body vibration. As a result, it is shown that the vibration occurring in the compound curve is caused by the centrifugal force generated by the passage of the train on the vertical curve and the imbalance in stiffness between the left and right air springs during tilting. It is also shown that an antiroll damper has a potential to suppress the increase in car-body vibration in compound curves.
PDF
