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Reduction of outgassing from the ferrite cores in the kicker magnet of J-PARC RCS

J-PARC RCS用キッカー電磁石において使用されているフェライト材の放出ガスの低減処理

荻原 徳男; 菅沼 和明 ; 引地 裕輔; 西川 雅章; 柳橋 亨; 神谷 潤一郎  ; 金正 倫計 

Ogiwara, Norio; Suganuma, Kazuaki; Hikichi, Yusuke; Nishikawa, Masaaki; Yanagibashi, Toru; Kamiya, Junichiro; Kinsho, Michikazu

Kicker magnets are used to kick out the accelerated beam to the beam transport lines in the RCS of the J-PARC. A high voltage is applied to kickers for a short period, so they must be installed in a vacuum to prevent discharge. Therefore, it is important to reduce the outgassing of water vapor from the ferrite cores. After bake-out at 200$$^{circ}$$C for 300 hours, the outgassing rate decreased to less than 1$$times$$10$$^{-7}$$ Pam/s. However, the small amount of water vapor and carbon monoxide were emitted from the ferrite cores at charging voltage of 80 kV. This time, we have decided to construct the reserve magnets with very low outgassing at high-voltage discharge. First of all, the thermal desorption behavior of the ferrite was investigated. Water vapor has two peaks: at about 150$$^{circ}$$C and 350$$^{circ}$$C. Carbon monoxide is rather largely emitted around 400$$^{circ}$$C and then decreases with the temperature. From these results, the ferrite cores were vacuum-fired at 450$$^{circ}$$C for 48 h. Then the good properties for the magnetic cores were confirmed. And now the assembling of the kicker magnet is undertaken.

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