27pA01

サテライト•トカマク(JT-60SA)計画の進展	 
Progress of the Satellite Tokamak (JT-60SA) Programme	 石田真一1)、鎌田裕2)、ピエトロ•バラバスキ3)、JT-60SAチーム
Shinichi Ishida1), Yutaka Kamada2), Pietro Barabaschi3) and the JT-60SA Team
JT-60SA事業チーム1)、日本原子力研究開発機構2)、
ITER及び核融合エネルギー開発のための欧州共同事業3)
JT-60SA Project Team1), JAEA2), Fusion for Energy3)
The mission of JT-60SA is to contribute to the early
realization of fusion energy by supporting theexploitation of ITER and research towards DEMO byaddressing key physics issues associated with thesemachines. As reported in 1-3), the Satellite Tokamak
Programme has been jointly implemented since 2007
by Europe and Japan at the JAEA Naka site as shownin Fig.1 by constructing and exploitating JT-60SA, adevice with Ip=5.5 MA, Bt=2.25 T, Rp~3 m,PNBI+ECRF=41 MW for 100 s.

Germany, CIEMAT (Cryostat) in Spain, SCK-CEN(TFC test) in Belgium.
Overall the project has progressed well as described
below along the high-level project schedule as shownin Fig.2. JT-60SA is now foreseen to start operatingin 2019, pursuing its challenging mission for therealization of fusion energy. For the procurement
implementation, significant delays affecting the critical
path in the schedule have not been encountered either
in Europe or Japan. Most recently, the successful
manufacturing of the cryostat base, the first massive
deliverable from Europe to Japan, ensures the real startof the JT-60SA assembly at the JAEA Naka site fromJanuary 2013. The disassembly of JT-60 and removalfrom the torus hall was also successfully completed inOctober 2012.

Fig.1 In-kind contributions from Europe and Japan
So far, 18 Procurement Arrangements (about 80% of
the total value of construction) have been agreed
between the two Implementing Agencies (IAs), JAEA
for Japan, and Fusion for Energy (F4E) for Europe,and related contracts awarded and implemented for
manufacturing the components including toroidal
field coils (TFC), poloidal field coils (PFC), hightemperature superconducting current leads (HTS-CL),vacuum vessel (VV), cryostat base (CB), power
supplies (PS), first wall materials, diverter cassettes,
and remote handling (RH) tools. In Europe, some parts
are directly contributed by F4E, but the bulk of theprocurement is being also carried out by EU Voluntary
Contributors: CEA in France (Cryogenic system, TFC,PS, TFC test), ENEA (TFC, PS, TFC test) andConsorzio-RFX (PS) in Italy, KIT (HTS-CL) inFig.2 High-level project schedule
For the TFC, the NbTi strand production continues onschedule. Manufacture of the TFC conductors andwindings is also on track for series production asshown in Fig.3. The contract for the TFC casings wasawarded in July 2012. Delivery of all the components
such as the cryostat and valve box vessel for the TFC
test facility by truck from Liege to CEA Saclay wascompleted in October 2012. For the PFC, series
production of the conductors for the equilibrium field(EF) coils and central solenoid (CS) is in progress inthe conductor manufacturing building in Naka. Thelowest EF coil (EF4) was completed and delivered toNaka in April 2012. A CS quad pancake using acopper dummy conductor was completed. Lower EFcoils (EF5 and EF6) are now being fabricated in thecoil winding building in Naka as shown in Fig.4.

Assembly of the inboard and outboard parts of the VV
40-degree sector is in progress in the vacuum vessel
sector-assembly building in Naka. Three VV
40-degree sectors have already been completed asshown in Fig.5. Connection by welding of the inboard
and outboard parts of the fourth 40-degree sector
delivered to Naka will be completed in November
2012.
Manufacture of the cryostat base will be completed by
the end of October as shown in Fig.6. The delivery of
the cryostat base to Japan is foreseen at the beginningof January 2013 in time for the assembly on site. Thecryostat base will be transported from Aviles in Spainto the Hitachi port by F4E and from the port to Nakaby JAEA.

Fig, 3 Impregnation mould of winding pack TF coilFig.6 Pre-assembly of lower structure for cryostat base
The JT-60SA Research Plan (version 3.0) to be carriedout once JT-60SA is operating is now under revision this plan is being developed jointly by the several
hundred researchers involved in the fusion
programmes of Europe and Japan.
Fig.4 Fabrication of EF coils in Naka

Despite the complicated nature of arrangements for theinvolved institutions, and the long distance between
Europe and Japan, there is a good and everimproving understanding and relationship between
members of the JT-60SA Team, and enthusiasm anddedication from all to try to maintain the schedule andquality of the delivery of components andeventual machine assembly and commissioning. Thisis very encouraging for the successful outcome of thisinternational project.
References:
1) S. Ishida et al., Nucl. Fusion 51 (2011) 094018.
2) P. Barabaschi et al., Fusion Eng. and Des. 86(2011) 484
3) Y. Kamada et al, “Progress of the JT-60SAProject” Proc. 24th Int. Conf. on Fusion Energy
2012 (San Diego, US, 2012) OV4-1

Fig.5 Assembly of VV 40-degree sector in Naka