H. "Yoshida

T." Norimatsu

National Institute for Fusion Science (NIFS-Repository)

  A target for First Ignition for Inertial Fusion Energy is protected from thermal radiation by a container sabot.  The target is separated from the sabot before entering to the reactor chamber.  We have been developed magnetic sabot-remover applying Lorentz force generated by permanent magnet array (PMA)1-6).  The force acts on only sabot for removal it.  In order to improve injection accuracy, improvement of machining accuracy of sabot and introduction of sabot rotation are carried out5). Fig. 1 shows the experimental injector system.  A poly-styrene form target (4.0± 0.05mmφ, 0.8mg) was inserted in an aluminum sabot (9.35mmφx40mm, 5.07g) with machining accuracy of 50 µm.  A solenoid valve releases 106 Pa N2 gas to accelerate the sabot up to 40 m/s with the target.  Forty donut shape permanent magnets (OD30mm、ID14mm、5mmt) of PMA are set outside of the barrel.  The sabot passing through the PMA is selectively decelated down to 20 m/s.  Fig. 2 shows injection accuracy of ~13 mrad measured at the end of vaccum chamber.   Fig. 3 shows preliminary testing sabot rotation apparatus.  The pieces of neodymium magnets (232mT) are spirally set on the vertically fixed transparent acrylic barrel.  A free fallen sabot passed through it was rotated at the angular velocity of 30 π rad/s.  Its slip was estimated s=0.95.  The slip can be decreased by rearrangement of neodymium magnets.  We are introducing the tested rotating magnetic field to newly designed target injector.  We are constructing the new injector system shown in Fig. 4.  The effect of sabot rotation for target injection accuracy will be evaluated   1)  H. Yoshida, R. Makino, T. Niwa, Tokai-Section Joint Conference on Electrical and Related Engineering (2010) Pol-19. 2)  H. Yoshida, R. Makino, T. Niwa, Tokai-Section Joint Conference on Electrical and Related Engineering (2011) O3-8. 3)  H. Yoshida, N. Kameyama, Conference on Inertial Fusion Energy ’12 (2012) CIFE5-5. 4)  Kameyama N and Yoshida H 2013 Plasma Fusion Res.8, 3404045(2013). 5)  Kojima K, Kameyama N and Yoshida H, C521pIII04 (2014).  6)  Kameyama N, Kojima K and Yoshida H, C521pIII05 (2014).      Fig. 3 Preliminary tested sabot rotation apparatus.  Fig.1 Experimental injector system     Fig. 2 Target injection accuracy  Fig. 4 Newly designed target injector 1m 1m Neodymium Magnet (232mT) Sabot Acrylic barrel 561§62. Optimization of Sabot for Target Injection Accuracy - Development of Sabot Remover of Target Injector for IFE -Yoshida, H. (Gifu Univ.),  Norimatsu, T. (Osaka Univ.)

Optimization of Sabot for Target Injection Accuracy - Development of Sabot Remover of Target Injector for IFE -

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