12．COMET と耐放射線超伝導磁石開発

高エネルギー加速器研究機構
吉田

誠

飯尾雅実

目

次

COMETと耐放射線超伝導磁石開発
１

はじめに……………………………………………………………………………………………………

12−１

２

ミューオンビームライン………………………………………………………………………………

12−１

３

COMET超伝導磁石……………………………………………………………………………………

12−１

３．１

パイオン捕獲ソレノイド …………………………………………………………………………

12−２

３．２

ミューオン輸送ソレノイド ………………………………………………………………………

12−３

４

COMET超伝導磁石の放射線耐性

５

実際の設計例６……………………………………………………………………

12−３……………………………………………………………………………………………

12−４

５．１

パイオン捕獲ソレノイドの構造 …………………………………………………………………

12−４

５．２

有限要素法によるシミュレーション ……………………………………………………………

12−５……………………………………………………………………………

12−11

６．１

将来の耐放射線超伝導磁石 ………………………………………………………………………

12−12

６．２

REBCO線材の照射効果 …………………………………………………………………………

12−12

６．３

無機絶縁コイルの開発 ……………………………………………………………………………

12−16

７

さらなる大強度化に向けてまとめと謝辞参考文献……………………………………………………………………………………………

12−21………………………………………………………………………………………………………

12−22

COMET ࡜⪏ᨺᑕ⥺㉸ఏᑟ☢▼㛤Ⓨ
1. ࡣࡌࡵ࡟

(2 െ 1)ࡇࡢ࡜ࡁࠊࣃ࢖࢜ࣥࢆ⏕ᡂࡍࡿࡓࡵࡢᶆⓗ࡜㸪ᶆⲈᇛ┴ᮾᾏᮧࡢ኱ᙉᗘ㝧Ꮚຍ㏿ჾ᪋タ J-PARC࡛ ࡣࠊ ࣑࣮ࣗ ࢜ࣥ ̿㟁Ꮚ ㌿᥮ 㐣⛬ࢆ ᥈⣴ ࡍࡿ
COMET ᐇ㦂[1]ࡢ‽ഛࡀ㐍ࡵࡽࢀ࡚࠸ࡿࠋ
࣑࣮ࣗ࢜ࣥࡣࠊ┿✵୰࡛ࡣ 2.2 ࣐࢖ࢡࣟ⛊ࡢᑑ࿨࡛࣑࣮ࣗࢽ࣮ࣗࢺࣜࣀ࡜཯㟁Ꮚࢽ࣮ࣗࢺࣜࣀࠊ
㟁Ꮚࡢ㸱ࡘࡢ⣲⢏Ꮚ࡟ᔂቯࡍࡿࡀࠊ≀㉁୰࡛ࡣ㈇࣑࣮ࣗ࢜ࣥࡣཎᏊ᰾࡟ᤕ⋓ࡉࢀ࡚࣑࣮ࣗࢽ࣮ࣗ
ࢺࣜࣀࡀᨺฟࡉࢀࡿࠋࡇࢀࡽࡢᔂቯ㐣⛬ࡣ⣲⢏Ꮚᶆ‽⌮ㄽ࡟ࡼࡗ࡚ㄝ࡛᫂ࡁࠊᔂቯࡢ๓ᚋ࡛ࣞࣉࢺ
ࣥࣇ࢓࣑࣮ࣜᩘࡣཝᐦ࡟ಖᏑࡉࢀࡿࠋ୍᪉ࠊࢽࣗ
࣮ࢺࣜࣀࡀ᭷㝈ࡢ㉁㔞ࢆᣢ࡚ࡤᶆ‽⌮ㄽࡢᯟෆ࡛ࡶⲴ㟁ࣞࣉࢺࣥࡢࣞࣉࢺࣥࣇ࣮ࣞࣂ㠀ಖᏑ㐣⛬ࡣ㉳ࡇࡾ࠼ࡿࡀࠊࢽ࣮ࣗࢺࣜࣀ㉁㔞ࡀ㠀ᖖ࡟ᑠࡉ࠸ࡇ࡜ࡶ࠶ࡗ࡚ࠊࡑࡢᔂቯศᒱẚࡣ 10-54 ⛬ᗘ࡜ࠊ฿ᗏほ ࡛ࡁ࡞࠸ࢫࢣ࣮࡛ࣝ࠶ࡿࠋࡋࡓࡀࡗ
࡚ࠊࡶࡋⲴ㟁ࣞࣉࢺࣥࣇ࣮ࣞࣂࡢ◚ࢀࢆほ ࡛ࡁࢀࡤࠊᶆ‽⌮ㄽࢆ㉸࠼ࡿᮍ▱ࡢ┦஫స⏝ࡢᏑᅾࢆ♧ࡍドᣐ࡜࡞ࡿࠋᶆ‽⌮ㄽࢆ㉸࠼ࡿ≀⌮ࣔࢹࣝࡢከࡃࡣࠊⲴ㟁ࣞࣉࢺࣥࣇ࣮ࣞࣂ࡟࠾࠸࡚኱ࡁ࡞◚ࢀࢆணゝࡋ࡚࠾ࡾ[2]ࠊ᥈⣴⢭ᗘࡢྥୖࡀᚅࡕᮃࡲ
ࢀ࡚࠸ࡿࠋ
COMET ᐇ㦂ࡣࠊ㐣ཤࡢᐇ㦂ࡼࡾ᥈⣴⢭ᗘࢆ 1୓ಸ⛬ᗘྥୖࡍࡿࡇ࡜ࢆ┠ᣦࡋ࡚࠾ࡾࠊࡑࡢࡓࡵ
࡟ࡣୡ⏺᭱኱ᙉᗘ࡜࡞ࡿẖ⛊ 1011 ಶࡢ㈇࣑࣮ࣗ
࢜ࣥࢆ⏕ᡂࡍࡿ᪂ࡋ࠸ࣅ࣮࣒ࣛ࢖ࣥࡀᚲせ࡛࠶ࡿࠋᮏ✏ࡣࠊCOMET ᐇ㦂ࡢ࣑࣮ࣗ࢜ࣥࣅ࣮࣒ࣛ
࢖ࣥ࡟ࡘ࠸࡚ࠊࡑࡢ≉Ⰽ➼࡟ࡘ࠸࡚⤂௓ࡋࠊ኱ᙉ
ᗘ࣑࣮ࣗ࢜ࣥࣅ࣮࣒ࢆ⏕ᡂࡍࡿࡓࡵࡢ㉸ఏᑟ☢
▼ࡢタィࡸࠊࡼࡾ኱ᙉᗘ໬ࢆ┠ᣦࡋ࡚ᨺᑕ⥺⪏ᛶࢆྥୖࡉࡏࡿࡓࡵࡢ㉸ఏᑟ☢▼㛤Ⓨ࡟ࡘ࠸࡚㏙࡭ࡿࠋⓗ࠿ࡽᨺฟࡉࢀࡿࣃ࢖࣭࣑࣮࢜ࣥࣗ࢜ࣥࢆᤕ⋓ࡋࣅ࣮࣒ࣛ࢖ࣥ࡟ྲྀࡾ㎸ࡴࡓࡵࡢ☢▼㸪࠾ࡼࡧࣃ࢖
࢜ࣥࢆᔂቯࡉࡏ࣑࣮ࣗ࢜ࣥࢆᐇ㦂ᐊ࡟㍺㏦ࡍࡿ
ࡓࡵࡢ☢▼ࡀᚲせ࡛࠶ࡿࠋᚑ᮶ࡢ࣑࣮ࣗ࢜ࣥࣅ࣮
࣒ࣛ࢖࡛ࣥࡣᅄ㔜ᴟ☢▼࡞࡝ࡀ⏝࠸ࡽࢀ࡚࠸ࡓ
ࡀࠊ㏆ᖺࡣ࣑࣮ࣗ࢜ࣥࣅ࣮࣒ࡢ኱ᙉᗘ໬㸪㧗⣧ᗘ໬࡞࡝ࡢᛶ⬟ྥୖࡢࡓࡵࠊᙉ☢ሙࢆⓎ⏕࡛ࡁࡿ㉸ఏᑟࢯࣞࣀ࢖ࢻ☢▼ࡀ฼⏝ࡉࢀ࡚࠸ࡿࠋ౛࠼ࡤ㸪J-PARC ≀㉁࣭⏕࿨⛉Ꮫᐇ㦂᪋タෆࡢ࣑࣮ࣗ࢜ࣥ
⛉Ꮫᐇ㦂᪋タ(MUSE)[3]࡛ࡣࠊᶆⓗ࠿ࡽᨺฟࡉࢀ
ࡓ࣑࣮ࣗ࢜ࣥࢆ㞟ࡵࡿࡓࡵ࡟ᶆⓗ㏆ഐ࡟ᅄ㔜ᴟ☢▼ࡲࡓࡣᖖఏᑟࡢࢯࣞࣀ࢖ࢻ☢▼ࢆタ⨨ࡋࠊ6m 㛗ࡢ㉸ఏᑟࢯࣞࣀ࢖ࢻ☢▼[4]࡟ࡼࡗ࡚༑ศ࡞
ࢻࣜࣇࢺ㛗ࢆ☜ಖࡍࡿࡇ࡜࡛ࠊ࣑ࣗ࢜ࣥࢫࣆࣥᅇ
㌿/⦆࿴/ඹ㬆㸦PSR㸧ἲࡸ㠀◚ቯඖ⣲ศᯒ࡞࡝࡟࣑
࣮ࣗ࢜ࣥࣅ࣮࣒ࢆᥦ౪ࡋ࡚࠸ࡿࠋ
ࡉࡽ࡟኱ᙉᗘࡢ࣑࣮ࣗ࢜ࣥࣅ࣮࣒ࢆᘬࡁฟࡍ
ࡓࡵ࡟ࠊ㉸ఏᑟࢯࣞࣀ࢖ࢻෆ㒊࡟ᶆⓗࢆタ⨨ࡋࠊᶆⓗୖ࡟༳ຍࡉࢀࡓᙉ☢ሙ࡟ࡼࡗ࡚࣑࣮࣭ࣗ࢜ࣥ
ࣃ࢖࢜ࣥࢆࢺࣛࢵࣉࡍࡿ”solenoid capture system”
㸦௨ୗ㸪ࣃ࢖࢜ࣥᤕ⋓ࢩࢫࢸ࣒㸧ࡀ⪃᱌ࡉࢀࡓ[5]ࠋ
ࣃ࢖࢜ࣥᤕ⋓ࢩࢫࢸ࣒ࡣ㸪ཌ࠸ᶆⓗࢆ㉸ఏᑟ☢▼ෆ㒊࡟タ⨨ࡋᙉ☢ሙࢆ༳ຍࡍࡿࡇ࡜࡛㸪ᚑ᮶ᆺࡢ1000 ಸ௨ୖࡢ࣑࣮ࣗ࢜ࣥࢆᘬࡁฟࡍࡇ࡜ࡀ࡛ࡁ
ࡿࠋࣃ࢖࢜ࣥᤕ⋓ࢩࢫࢸ࣒ࡣࠊ኱㜰኱Ꮫ᰾≀⌮◊✲ࢭࣥࢱ࣮࡟ᘓタࡉࢀࡓ࣑࣮ࣗ࢜ࣥࣅ࣮࣒ࣛ࢖
ࣥ MuSIC[6]࡟᥇⏝ࡉࢀࠊࡑࡢ㧗ຠ⋡ᛶࡀᐇドࡉࢀ࡚࠸ࡿࠋ
COMET ᐇ㦂࡟࠾࠸࡚ࡣࠊࡼࡾ኱ᙉᗘࡢ࣑࣮ࣗ
࢜ࣥࣅ࣮࣒⏕ᡂࢆ┠ᣦࡋ࡚ࠊJ-PARC ୺ࣜࣥࢢࢩ
ࣥࢡࣟࢺࣟࣥ(MR)ࡢ኱ᙉᗘ㝧Ꮚࣅ࣮࣒ࢆ฼⏝ྍ⬟࡞኱ᆺ㉸ఏᑟ☢▼࡟ࡼࡿࣃ࢖࢜ࣥᤕ⋓ࢩࢫࢸ

2. ࣑࣮ࣗ࢜ࣥࣅ࣮࣒ࣛ࢖ࣥ

࣒ࢆ᥇⏝ࡋࡓࠋ

࣑࣮ࣗ࢜ࣥࡣࠊ㧗࢚ࢿࣝࢠ࣮㝧Ꮚࢆᶆⓗ࡟ධᑕࡋࠊⓎ⏕ࡋࡓ 2 ḟ⢏Ꮚ࡛࠶ࡿࣃ࢖࢜ࣥࡢᔂቯ࡟ࡼ
ࡗ࡚ᚓࡽࢀࠊ࣑࣮ࣗ࢜ࣥ̿㟁Ꮚ㌿᥮㐣⛬᥈⣴࡟ᚲせ࡞㈇࣑࣮ࣗ࢜ࣥࡣḟᘧࡢᔂቯ࡛ᚓࡽࢀࡿࠋߨ ି ՜ ߤି + തതതߥఓ

3. COMET ㉸ఏᑟ☢▼
COMET ࣑࣮ࣗ࢜ࣥࣅ࣮࣒ࣛ࢖ࣥࡣࡍ࡭࡚㉸ఏᑟ☢▼࡛ᵓᡂࡉࢀࠊJ-PARC ࣁࢻࣟࣥᐇ㦂᪋タ࡟᪂タࡉࢀࡓࣁࢻࣟࣥ༡ᐇ㦂Ჷ࡟タ⨨ࡉࢀࡿࠋࣞ

12㸫 1ὶഃࡢ☢▼ࢆࣃ࢖࢜ࣥᤕ⋓ࢯࣞࣀ࢖ࢻࠊୗὶഃࢆ
࣑࣮ࣗ࢜ࣥ㍺㏦ࢯࣞࣀ࢖ࢻ࡜࿧ࡪࠋ௨ୗࠊྛ☢▼ࡢ≉ᚩࢆ㏙࡭ࡿࠋ
3.1. ࣃ࢖࢜ࣥᤕ⋓ࢯࣞࣀ࢖ࢻ
ᶆⓗୖ࡟༳ຍࡍࡿ☢ሙࡀᙉ࠸࡯࡝࣑࣮ࣗ࢜ࣥ
཰㔞ࡀୖࡀࡿࡢ࡛ࠊCOMET ᐇ㦂࡛ࡣࣃ࢖࢜ࣥᤕ
⋓ࢯࣞࣀ࢖ࢻࡢ୰ᚰ࡟⏕ᡂᶆⓗࢆ㓄⨨ࡋࠊᶆⓗୖ࡟ 5 T ࢆ༳ຍࡍࡿࠋFig. 3-2 ࡟࠾࠸࡚ࠊ㝧Ꮚࣅ࣮࣒ࡣᶓ㍈ࡢ࣐࢖ࢼࢫ᪉ྥ࡬ྥ࠿ࡗ࡚ධᑕࡋࠊ๓᪉
࡬ᩓ஘ࡉࢀࡓ㝧Ꮚ࡞࡝ࡢ㧗࢚ࢿࣝࢠ࣮⢏Ꮚࡣ☢
▼እ࡛ࢲࣥࣉࡍࡿࠋࡍ࡞ࢃࡕࠊ࣑࣮ࣗ࢜ࣥࣅ࣮࣒
ࣛ࢖ࣥࢆᵓᡂࡍࡿ㉸ఏᑟ☢▼ࡸᚋ⥆ࡢᐇ㦂⿦⨨ࡢ⿕ࡤࡃ㔞ࢆῶࡽࡍࡓࡵࠊ⏕ᡂᶆⓗࡢᚋ᪉࡟ᨺฟ

)LJ &20(7㸦3KDVH,㸧࣑࣮ࣗ࢜ࣥࣅ࣮
࣒ࣛ࢖ࣥࡢࣞ࢖࢔࢘ࢺ

ࡉࢀࡓࣃ࢖࢜ࣥࡢࡳࢆ཰㞟ࡍࡿࠋ8 GeV 㝧Ꮚࣅ࣮࣒ࢆᶆⓗ࡟ධᑕࡋࡓ࡜ࡁ࡟ᨺฟࡉࢀࡿࣃ࢖࢜ࣥ

࢖࢔࢘ࢺࢆ Fig. 3-1 ࡟♧ࡍࠋJ-PARC MR ࡛ 8 GeVࡣࠊ㝧Ꮚࣅ࣮࣒๓᪉࡟ྥ࠿ࡗ࡚ᨺฟࡉࢀࡿࡶࡢࡀ

ࡲ࡛ຍ㏿ࡉࢀࡓࣃࣝࢫ㝧Ꮚࣅ࣮࣒ࢆࠊ㉸ఏᑟࢯࣞከ࠸ࡀࠊ᭱⤊ⓗ࡟ᐇ㦂࡟ᚲせ࡟࡞ࡿ࠾࠾ࡴࡡ 50

ࣀ࢖ࢻ☢▼ࡢ࣎࢔ෆ࡟タ⨨ࡋࡓᶆⓗ࡟ධᑕࡋࠊ⏕MeV/c ௨ୗࡢప㐠ື㔞㈇࣑࣮ࣗ࢜ࣥ࡟㛵ࡋ࡚ࡣࠊᡂࡋࡓ࣑࣮ࣗ࢜ࣥࣅ࣮࣒ࢆ㐽ⶸቨ࡛㝸࡚ࡽࢀࡓᚋ᪉࡟ᨺฟࡉࢀࡓప㐠ື㔞ࣃ࢖࢜ࣥࡢࡳࢆᤕ⋓㞄ࡢᐇ㦂ᐊ࡬㍺㏦ࡍࡿࠋ࣑࣮ࣗ࢜ࣥࢆࣟࢫࡋ࡞࠸

ࡋ࡚ࡶ኱ࡁ࡞ᕪࡣ⏕ࡌ࡞࠸ࠋᙉ☢ሙ࡟ࡼࡗ࡚ᤕ⋓ࡋࡓࣃ࢖࢜ࣥࡣࠊୗὶ࡟ྥ
࠿ࡗ࡚₞ῶࡍࡿ☢ሙ໙㓄ࢆ฼⏝ࡋ࡚཰᮰ࡉࢀࡿࠋ
ࢻࣜࣇࢺ୰ࡢࣃ࢖࢜ࣥ࡟࠾࠸࡚ࠊࢯࣞࣀ࢖ࢻ☢ሙࢆ Bࠊࢯࣞࣀ࢖ࢻ㍈࡟ᆶ┤࡞㐠ື㔞ࢆp௧ , ㌶㐨༙ᚄࢆ R ࡜ࡍࡿ࡜௨ୗࡢᘧࡀᡂࡾ❧ࡘࠋࡓࡵ࡟ࠊᶆⓗ࠿ࡽ᳨ฟჾࡲ࡛㐃⥆ࡋࡓࢯࣞࣀ࢖ࢻ
☢▼࡛ᵓᡂࡍࡿࠋࡇࡢ࣑࣮ࣗ࢜ࣥࣅ࣮࣒ࣛ࢖ࣥࡣ
ᙉ☢ሙࠊ኱ཱྀᚄࡢ㉸ఏᑟࢯࣞࣀ࢖ࢻ࡟ࡼࡗ࡚ࠊ௨
ୗ࡟ᣲࡆࡿᶵ⬟ࢆᐇ⌧ࡍࡿࠋ㸯) ⏕ᡂᶆⓗ࠿ࡽᨺฟࡉࢀࡿ㈇ࣃ࢖࢜ࣥࢆᤕ⋓ࡋࠊୗὶ࡟ྥ࠿ࡗ࡚཰᮰ࡉࡏࡿࠋpଶ௧ ൗ‫ ן ܤ‬p௧ × R = const.

(3 െ 1)㸰) 㛗࠸ࢻࣜࣇࢺ㊥㞳ࢆ☜ಖࡋ࡚ࣃ࢖࢜ࣥࢆᔂ
ቯࡉࡏࠊప㐠ື㔞ࡢ㈇࣑࣮ࣗ࢜ࣥࡢࡳࢆ㑅ูࡍࡿࠋ
Fig. 3-2 ࡟ COMET ࣑࣮ࣗ࢜ࣥࣅ࣮࣒ࣛ࢖ࣥ
ࡢ㍈ୖ☢ሙศᕸࢆ♧ࡍࠋ㉸ఏᑟ☢▼࡟ࡼࡗ࡚ 5 Tࡢᙉ☢ሙࢆⓎ⏕ࡋࠊࡑࡢ☢ሙࣆ࣮ࢡୖ(z=0)࡟⏕ᡂᶆⓗࢆ㓄⨨ࡍࡿࠋࣃ࢖࢜ࣥࡣ 5 T ࠿ࡽ 3 T ࡬₞ῶࡍࡿ☢ሙ໙㓄(z=0 ࠿ࡽ z=500 cm)࡟ࡼࡗ࡚ୗὶ
᪉ྥ࡬཰᮰ࡉࢀࠊ3 T ࡢ‴᭤ࡋࡓࢯࣞࣀ࢖ࢻ☢ሙ㸦ࢺࣟ࢖ࢲࣝ☢ሙ㸧(z=500 cm ࠿ࡽ z=1000 cm)୰࡛ᔂቯࡋࠊᐇ㦂ᐊ࡬㍺㏦ࡉࢀࡿࠋCOMET ࡛ࡣࡇࡢ࣑࣮ࣗ࢜ࣥࣅ࣮࣒⏕ᡂࡢࡓࡵࡢ☢ሙࢆࠊ኱ࡁࡃ
ศࡅ࡚ࡩࡓࡘࡢ㉸ఏᑟ☢▼࡟ࡼࡗ࡚Ⓨ⏕ࡉࡏࠊୖ

12㸫 2)LJ  &20(7 3KDVH, ⏝㉸ఏᑟ☢▼ࡢ㍈ୖ☢ሙศᕸࡍ࡞ࢃࡕࠊᆶ┤㐠ື㔞p௧ ࡣξ‫཯࡟ܤ‬ẚ౛ࡋ࡚ᑠࡉࡃ
࡞ࡿࡢ࡛ࠊࢯࣞࣀ࢖ࢻ☢ሙࢆᚎࠎ࡟ୗࡆࡿࡇ࡜࡛
p௧ ࢆ㍈᪉ྥ㐠ື㔞pκ ࡟ኚ᥮ࡋࠊ୪⾜ࣅ࣮࣒࡟㏆࡙ࡅࡿࡇ࡜ࡀ࡛ࡁࡿࠋࡓࡔࡋࠊࡇࡢ࡜ࡁ㌶㐨༙ᚄࡣξ‫཯࡟ܤ‬ẚ౛ࡋ࡚኱ࡁࡃ࡞ࡿࡓࡵࠊࢻࣜࣇࢺࢫ࣮࣌
ࢫࢆᚎࠎ࡟ᗈࡆ࡚࠸ࡃᚲせࡀ࠶ࡿࠋCOMET ࣃ࢖࢜ࣥᤕ⋓ࢯࣞࣀ࢖ࢻ☢▼ࡢヲ⣽タィ࡟ࡘ࠸࡚ࡣ
ᚋ㏙ࡍࡿࡀࠊᕳࡁᩘࡢ␗࡞ࡿ」ᩘࡢ㉸ఏᑟࢥ࢖ࣝ
㸦Fig. 3-1 ࡢ CS0 ࢥ࢖ࣝ࠿ࡽ TS1 ࢥ࢖ࣝ㸧ࢆ⤌ࡳྜࢃࡏࡿࡇ࡜࡛ࠊࡇࡢࡼ࠺࡞☢ሙศᕸࢆᐇ⌧ࡍࡿࠋࢥ࢖ࣝᵓ㐀యࡢヲ⣽タィ࡟㛵ࡋ࡚ࡣࠊ5 ❶࡛
⤂௓ࡍࡿࠋ

7DEOH ࣑࣮ࣗ࢜ࣥ㍺㏦ࢯࣞࣀ࢖ࢻࡢㅖඖ
Item

Value

Conductor

NbTi/Cu monolith wire

Cable dimensions

I1.5 mm (without insulation)(Solenoids)

I1.56 mm (with insulation)

Cable dimensions

I1.2 mm (without insulation)(Dipole coils)

I1.3 mm (with insulation)

Cable insulation

Polyamide-imide enamel (AIW),

Cu/NbTi = 6

PVF (TS2-15,16, TS3)

3.2. ࣑࣮ࣗ࢜ࣥ㍺㏦ࢯࣞࣀ࢖ࢻ
ࣃ࢖࢜ࣥᤕ⋓ࢯࣞࣀ࢖ࢻ࡛ᤕ⋓ࡉࢀࡓࣃ࢖࢜ࣥ ࡣࠊ ࢯࣞࣀ ࢖ࢻ ☢ሙ࡟ ἢࡗ ࡚㍺㏦ ࡉࢀ ࡿ ࠋMagnet length~6 meters

Curvature Radius

3 meters

Num. of solenoid coils

18

Num. of dipole coils

16 pairs

Operation current

210 A (solenoids)
175 A (dipole coils)

COMET ࡛ࡣࠊ5 ࣓࣮ࢺࣝ㛗㸦Phase-II ࡛ࡣ 10

Field on axis࣓࣮ࢺࣝ㛗㸧ࡢ 3 T ࢯࣞࣀ࢖ࢻ☢ሙ୰࡛ࣃ࢖࢜ࣥ

~3 T (solenoid)~0.056 T (dipole)ࢆᔂቯࡉࡏࡿࠋࡉࡽ࡟ࠊࡇࡢ㛗࠸ࢯࣞࣀ࢖ࢻࢆ᭤

Stored energy

5.6 MJ⋡༙ᚄ 3 ࣓࣮ࢺࣝࡢ‴᭤ࡋࡓᙧ≧࡜ࡍࡿࡇ࡜࡛ࠊ

Total inductance254 H‴᭤ෆഃࡢ☢ሙࡀᙉࡃࠊእഃࡀᙅ࠸ࢺࣟ࢖ࢲࣝ☢

Coil inner diameter

468 mm (TS2a~TS2-16)
600 mm (TS3)ሙࢆᙧᡂࡍࡿࠋࡇࡢ‴᭤ࢯࣞࣀ࢖ࢻ࡟ࡼࡿ☢ሙ୰

RefrigerationࢆⲴ㟁⢏Ꮚࡀ㍺㏦ࡉࢀࡿ㝿ࠊࡽࡏࢇ㌶㐨ࡢᅇ㌿୰

conduction from forced flow 2phase LHe piping (7~10 g/s)

ᚰࡣࠊ‴᭤㠃࡟ᑐࡋ࡚ᆶ┤᪉ྥ࡟ࢻࣜࣇࢺࡍࡿࠋ

Quench protection

semi-active quench back heaterࢻࣜࣇࢺ㔞ࡣⲴ㟁⢏Ꮚࡢ㐠ື㔞࡜ࣆࢵࢳ࢔ࣥࢢ
ࣝ࡟ࡼࡗ࡚ḟᘧ࡛⾲ࡉࢀࡿ㸹D=

1 ‫݌ ݏ‬1ቀ ቁ ቀ ቁ ൬cos ߠ +൰‫ ܴ ܤݍ‬2cos ߠ(3 െ 2)

ࡇࡇ࡛ࠊSࠊT ࡣ㍺㏦ࡍࡿ⢏Ꮚࡢ㟁Ⲵࠊ㐠ື㔞ࠊTࡣࢯࣞࣀ࢖ࢻ㍈࡟ᑐࡍࡿࣆࢵࢳ࢔ࣥࢢࣝࠊV ࡣࢯ
ࣞࣀ࢖ࢻ㍈࡟ἢࡗ࡚㍺㏦ࡉࢀࡓ㊥㞳ࠊR ࡣ‴᭤ࢯࣞࣀ࢖ࢻࡢ᭤⋡༙ᚄ࡛࠶ࡿࠋࡍ࡞ࢃࡕࠊࢻࣜࣇࢺ
㔞ࡀ㐠ື㔞࡟ẚ౛ࡋࠊࡉࡽ࡟㟁Ⲵࡢṇ㈇࡟ࡼࡗ࡚
ࢻࣜࣇࢺ᪉ྥࡀ㏫࡟࡞ࡿࡇ࡜࠿ࡽࠊప㐠ື㔞ࡢ㈇࣑࣮ࣗ࢜ࣥࢆࠊᐇ㦂ࡢࣂࢵࢡࢢࣛࣥࢻ࡜࡞ࡾ࠺ࡿ
ṇ㟁Ⲵ࣑࣮ࣗ࢜ࣥࡸ㧗㐠ື㔞࣑࣮ࣗ࢜ࣥ࡞࡝࠿
ࡽศ㞳ࡍࡿࡇ࡜ࡀྍ⬟࡜࡞ࡿࠋࡓࡔࡋࠊḧࡋ࠸࣑࣮ࣗ࢜ࣥࡀ㐣ᗘ࡟ࢻࣜࣇࢺࡍࡿ࡜☢▼ෆ⟄࡟ᙜࡓࡗ࡚ᾘኻࡋ࡚ࡋࡲ࠺ࡢ࡛ࠊḟᘧ࡛⾲ࡍࢲ࢖࣏࣮
ࣝ☢ሙࢆ㏣ຍࡋ࡚ࢻࣜࣇࢺࢆ࢟ࣕࣥࢭࣝࡍࡿᚲ
せࡀ࠶ࡿࠋ
B௖௢௠௣ =1 ‫݌‬1ቀ ቁ ൬cos ߠ +൰‫ ܴݍ‬2cos ߠ(3 െ 3)࣑࣮ࣗ࢜ࣥ㍺㏦ࢯࣞࣀ࢖ࢻࡣࠊFig. 3-1 ࡟♧ࡍࡼ࠺࡟ࠊෆᚄ⣙ 46 cmࠊ㍈㛗⣙ 20 cm ࡢ▷࠸㉸ఏᑟࢯࣞࣀ࢖ࢻࢥ࢖ࣝࢆ᭤⋡༙ᚄ 3 ࣓࣮ࢺࣝࡢ࿘ୖ࡟
㐃ࡡࡓᵓ㐀ࢆࡋ࡚࠾ࡾࠊྛࢯࣞࣀ࢖ࢻࢥ࢖ࣝ࡟㉸ఏᑟࢲ࢖࣏࣮ࣝࢥ࢖ࣝࢆేタࡍࡿࡇ࡜࡛ࠊప㐠ື㔞ࡢ㈇࣑࣮ࣗ࢜ࣥࢆ☢▼୰ᚰ࡟ಖᣢࡋࡓࡲࡲ㍺㏦ࡍࡿࡇ࡜ࡀ࡛ࡁࡿタィ࡜࡞ࡗ࡚࠸ࡿࠋࡑࡢ௚ࠊ
☢▼ㅖඖࢆ Table 3-1 ࡟♧ࡍࠋ௨ୖࡢࡼ࠺࡟ࠊCOMET ࣑࣮ࣗ࢜ࣥࣅ࣮࣒ࣛ࢖
ࣥࡣࠊ࣑࣮ࣗ࢜ࣥࣅ࣮࣒ࡢ኱ᙉᗘ໬ࡢࡳ࡞ࡽࡎࠊ
ࣂࢵࢡࢢࣛࣥࢻ⢏Ꮚࡢపῶࡶᅗࡗ࡚᭱㐺໬ࡉࢀ࡚࠸ࡿࠋḟ❶࡛ࡣࠊ኱ᙉᗘ໬࡟క࠺㧗࠸ᨺᑕ⥺࡟ᑐᛂࡍࡿࡓࡵࡢタィ࡟ࡘ࠸࡚㏙࡭ࡿࠋ

4. COMET ㉸ఏᑟ☢▼ࡢᨺᑕ⥺⪏ᛶ
COMET ࡣ J-PARC MR ࡢ 8 GeV/56 kW 㝧Ꮚࣅ࣮࣒(Phase-I ࡛ࡣ 3.2 kW)ࢆ౑ࡗ࡚኱ᙉᗘ࣑ࣗ
࣮࢜ࣥࣅ࣮࣒ࢆ౪⤥ࡍࡿィ⏬࡛࠶ࡿࠋࣃ࢖࢜ࣥᤕ
⋓ࢯࣞࣀ࢖ࢻ࡛ࡣࠊࣃ࢖࢜ࣥᤕ⋓ຠ⋡ࢆ᭱኱໬ࡍ
ࡿࡓࡵࠊ⏕ᡂᶆⓗࢆ 5 T ☢ሙࢆⓎ⏕ࡍࡿ CS1 ࢥ

12㸫 3࢖ࣝࡢ࡯ࡰ୰ᚰ࡟タ⨨ࡍࡿࠋ⏕ᡂᶆⓗ࠿ࡽࡣࣃ࢖
࢜ࣥࡢࡳ࡞ࡽࡎ࣐࢞ࣥ⥺ࡸ୰ᛶᏊ࡞࡝ᵝࠎ࡞ᨺᑕ⥺ࡀⓎ⏕ࡋࠊ㉸ఏᑟࢥ࢖ࣝࡀ⿕ࡤࡃࡍࡿࡇ࡜࡟
࡞ࡿࠋࡑࡢࡓࡵࠊᶆⓗࡢ࿘ࡾ࡟ࡣ᭱኱ 44 cm ཌࡢࢱࣥࢢࢫࢸࣥྜ㔠ࡢ㐽ⶸయࢆᤄධࡋ㉸ఏᑟࢥ࢖ࣝࢆಖㆤࡍࡿタィ࡛࠶ࡿࡀࠊࡑࢀ࡛ࡶ࡞࠾㐽ⶸయ
ࢆ㏱㐣ࡋ࡚ࡃࡿ୰ᛶᏊ➼ࡀ࠶ࡿࡓࡵࠊࣃ࢖࢜ࣥᤕ
⋓ࢯࣞࣀ࢖ࢻࡣ㧗࠸ᨺᑕ⥺⎔ቃୗ࡛㐠㌿࡛ࡁࡿࡇ࡜ࡀせồࡉࢀࡿࠋ
≉࡟ࠊᴟప ࡛ࡣ㔠ᒓᮦᩱࡢ⇕ᐜ㔞ࡀᴟ➃࡟ᑠࡉࡃ࡞ࡿࡢ࡛ࠊᨺᑕ⥺࡟ࡼࡿⓎ⇕ࡸ⇕ఏᑟ⋡ࡢຎ໬࡞࡝࡟ࡼࡗ࡚ࢥ࢖ࣝ ᗘࡀୖ᪼ࡋ࡞࠸ࡼ࠺࡟ࠊ
≉ู࡞ᑐฎࡀᚲせ࡜࡞ࡿࠋCOMET ࣃ࢖࢜ࣥᤕ⋓ࢯࣞࣀ࢖ࢻ࡜㍺㏦ࢯࣞ
ࣀ࢖ࢻࡣࠊᐇ㦂Ჷᆅୖ㝵࡟タ⨨ࡋࡓ࣒࣊ࣜ࢘෭෾
ᶵ࠿ࡽ౪⤥ࡉࢀࡿ 2 ┦ὶᾮయ࣒࣊ࣜ࢘࡟ࡼࡗ࡚෭
༷ࡉࢀࡿࡀࠊ࣒࣊ࣜ࢘࡟୰ᛶᏊࡀ↷ᑕࡉࢀࡿ࡜ࢺ
ࣜࢳ࣒࢘ࡀⓎ⏕ࡋࠊᨺᑕ⬟ࡀᗫᲠ㝈ᗘࢆ㉸࠼ࡿ࡞࡝ྲྀࡾᢅ࠸ࡀᅔ㞴࡟࡞ࡿࡇ࡜ࡀண᝿ࡉࢀࡿࠋࡑࡢ
ࡓࡵࠊࡇࢀࡽ㉸ఏᑟ☢▼ࡢ෭༷᪉ᘧࡣࠊ኱㔞ࡢᾮయ࣒࣊ࣜ࢘ࡀᚲせ࡞ᾐₕ෭༷࡛ࡣ࡞ࡃࠊ☢▼ෆ㒊࡟㓄⟶ࡋࡓ෭༷⟶࡟ᾮయ࣒࣊ࣜ࢘ࢆᚠ⎔ࡉࡏ࡚෭༷⟶࠿ࡽఏ⇕ᯈࢆ௓ࡋ࡚ࢥ࢖ࣝࢆ෭༷ࡍࡿ㛫᥋෭༷᪉ᘧ࡜ࡋࡓࠋ
ࣃ࢖࢜ࣥᤕ⋓ࢯࣞࣀ࢖ࢻ࡛ண᝿ࡉࢀࡿ୰ᛶᏊ
ࣇࣛࢵࢡࢫࡣࠊࣆ࣮ࢡ఩⨨࡛ 4×1021 n/m2 ࡟㐩ࡍࡿࠋ㉸ఏᑟࢥ࢖ࣝ࡜୰ᛶᏊ࡜ࡢ཯ᛂ࡟ࡼࡿⓎ⇕ࢆ᭱ᑠ㝈࡟ࡍࡿࡓࡵࠊ㉸ఏᑟࢥ࢖ࣝࢆྵࡴࢥ࣮ࣝࢻ
࣐ࢫࡣཎᏊ␒ྕࡀᑠࡉࡃ୰ᛶᏊ཯ᛂ᩿㠃✚ࡢᑠࡉ࠸࢔࣑࡛ࣝᵓᡂࡉࢀࡿࠋ㉸ఏᑟ⥺࡟㧗ᙉᗘ࢔࣑ࣝᏳᐃ໬ᮦࢆ౑⏝ࡍࡿࡇ࡜࡛ࢥ࢖ࣝ⮬యࡢ๛ᛶࢆୖࡆࠊࡉࡽ࡟෭༷⟶࠿ࡽࡢఏᑟ෭༷࡜ࡍࡿࡇ࡜
࡛ࠊࢥ࣮ࣝࢻ࣐ࢫࢆ᭱ᑠ㝈ࡢᵓ㐀య࡛ᵓᡂࡍࡿࡇ
࡜࡜ࡋࡓࠋ㉸ఏᑟࢥ࢖ࣝෆ㒊ࡢ᰾Ⓨ⇕ࡣ᭱኱ 40 mW/kg ࡟㐩ࡍࡿ࡜ண᝿ࡉࢀ࡚࠾ࡾࠊࢥ࢖ࣝ⾲㠃ࢆ෭༷ࡍࡿ
ࡔࡅ࡛ࡣෆ㒊 ᗘࡀୖࡀࡗ࡚ࡋࡲ࠸ NbTi ࡢ⮫⏺
ᗘࢆ㉸࠼ࡿࡇ࡜ࡀᠱᛕࡉࢀࡿࠋࡑࡇ࡛ࠊFig. 41 ࡢࡼ࠺࡟ࠊࢯࣞࣀ࢖ࢻࢥ࢖ࣝࡢᒙ㛫࡟⣧࢔࣑ࣝఏ⇕ᯈࢆᤄධࡋࠊࡇࡢఏ⇕ᯈࢆ෭༷⟶࡟᥋⥆ࡍࡿࡇ࡜࡛ࠊࢥ࢖ࣝෆ㒊ࢆ┤᥋෭༷ࡍࡿᵓ㐀࡜ࡋࡓࠋ
1020 n/m2 ࢆ㉸࠼ࡿ୰ᛶᏊࡀ↷ᑕࡉࢀࡿ࡜ఏ⇕ᯈࡢ㔠ᒓ⤖ᬗࡀ஘ࡉࢀ࡚⇕ఏᑟ⋡ࡀຎ໬ࡋ[7]ࠊࢥ
࢖ࣝ ᗘࡀୖ᪼ࡍࡿࡇ࡜ࡀண᝿ࡉࢀࡿࠋ⇕ఏᑟ⋡ࡢຎ໬ࢆ⪃៖ࡋࡓࢩ࣑࣮ࣗࣞࢩࣙࣥࢫࢱࢹ࢕[8]࡟ࡼࡿ࡜ࠊ56 kW ࣅ࣮࣒࡛ 100 ᪥㐠㌿ࡍࡿ࡜ࠊࢥ࢖ࣝෆ ᗘࡀ 6.4 K ࢆ㉸࠼࡚ ᗘ࣐࣮ࢪࣥࢆ☜ಖ

)LJ&20(7 ࣃ࢖࢜ࣥᤕ⋓ࢯࣞࣀ࢖ࢻ &6ࢥ࢖ࣝࡢᵓ㐀
࡛ࡁ࡞ࡃ࡞ࡿࡀࠊ࠸ࡗࡓࢇ᪼ ࡋ࡚Ḟ㝗ࢆ࢔ࢽ࣮ࣝࡍࢀࡤ෌ᗘ㐠㌿ྍ⬟࡜࡞ࡿࠋࡑࡢ௚ࠊ࣏ࣜ࢖࣑ࢻᇶᮦࡢከᒙ᩿⇕ࣇ࢕࣒ࣝࡸ
BT ᶞ⬡࡜࣍࢘⣲ࢆྵࡲ࡞࠸࢞ࣛࢫࢡࣟࢫࢆ౑ࡗ
ࡓ⤯⦕ࢸ࣮ࣉ[9]ࠊGFRP[10]ࢆ᥇⏝ࡋࠊ㧗ᨺᑕ⥺⎔ቃ࡟ᑐᛂࡋ࡚࠸ࡿࠋ

5. ᐇ㝿ࡢタィ౛ࡇࡢ❶࡛ࡣࠊࡇࢀࡲ࡛࡟㏙࡭ࡽࢀࡓᇶᮏࢥࣥࢭ
ࣉࢺࡸᇶ♏◊✲ࢹ࣮ࢱࢆᇶ࡟ᐇ㝿࡟⾜ࡗࡓタィࡢ౛࡜ࡋ࡚ࠊJ-PARC COMET ᐇ㦂⏝ࣃ࢖࢜ࣥᤕ
⋓ࢯࣞࣀ࢖ࢻ㸦Pion capture solenoid: PCS㸧ࡢᶵᲔタィ࡟ࡘ࠸࡚⡆༢࡟⤂௓ࡍࡿࠋᮏ❶ࡣ 2017 ᖺ࡟㞧ㄅ࡟ᥖ㍕ࡉࢀࡓ[11]ࢆᇶ࡟
ᇳ➹ࡉࢀ࡚࠸ࡿࡀࠊ2022 ᖺ࡟࠾࠸࡚ PCS ࡢ〇సࡣ㐍⾜୰࡛࠶ࡾࠊᮏ❶ࡢグ㏙࠿ࡽࡢኚ᭦ⅬࡀከᩘᏑᅾࡍࡿࠋኚ᭦Ⅼࡢ᭦᪂࡟ࡣ㏣ຍࡢ᳨ウ࡜ゎᯒࡀ⾜ࢃࢀ࡚࠾ࡾࠊࡑࢀࡽࢆ඲࡚⥙⨶ࡍࡿ࡜↹㞧࡟࡞ࡿࠋᮏ❶ࡢ┠ⓗࡣᐇ㝿ࡢタィࡢᇶᮏⓗ࡞ὶࢀࢆ⤂௓ࡍࡿࡶࡢ࡛࠶ࡿࡓࡵࠊ᭦᪂ࡉࢀ࡚࠸࡞࠸㒊ศࡀከᩘྵࡲࢀ࡚࠸ࡿࡇ࡜࡟ὀពࢆࡋ࡚㡬ࡁࡓ࠸ࠋ
5.1. ࣃ࢖࢜ࣥᤕ⋓ࢯࣞࣀ࢖ࢻࡢᵓ㐀
PCS ࡢタィ࣭〇సࡣ㠀ᖖ࡟ᣮᡓⓗ࡞ㄢ㢟࡛࠶ࡿࠋෆᚄ 1300 mm ࡢ኱ཱྀᚄ࣎࢔୰ᚰ࡟⣙ 5 T ࡢᙉ☢ሙࢆⓎ⏕ࡉࡏࠊ47 MJ ࡟ࡶཬࡪ࢚ࢿࣝࢠ࣮ࢆ

12㸫 4Ᏻ඲࡟ᅇ཰ࡋࠊ
᭦࡟୰ᛶᏊࣇ࢚ࣝࣥࢫࡀ 1021 n/m2ࢥ࢖ࣝࡸ☢▼㒊ရ࡬ࡢᨺᑕ⥺ࡢᙳ㡪ࢆపῶࡍ࡟㐩ࡍࡿ㧗ᨺᑕ⥺⎔ቃୗ࡛Ᏻᐃ࡟㐠㌿ࡋ࡞ࡅࢀࡿࡓࡵ PCS ࡢ࣎࢔ෆ㒊࡟㔜㔞⣙ 40 t ࡢࢱࣥࢢࢫ

ࡤ࡞ࡽ࡞࠸ࠋࡋࡓࡀࡗ࡚ࠊ㏻ᖖ㉸ఏᑟ☢▼࡛⪃៖ࢸࣥྜ㔠〇࡜⣙ 9 t ࡢ㖡〇ࡢ 2 ࡘࡢỈ෭᪉ᘧࡢᨺ

ࡍ࡭ࡁࠊຊᏛⓗ᮲௳ࠊ㟁☢ẼᏛⓗ᮲௳ࠊ⇕ຊᏛⓗᑕ⥺ࢩ࣮ࣝࢻࡀ㓄⨨ࡉࢀࡿࠋᵝࠎ࡞ไ㝈࡟ࡼࡾ⌧᮲௳࡟ຍ࠼࡚ࠊᨺᑕ⥺࡟ࡼࡿⓎ⇕ࡸ≉ᛶຎ໬ࢆ⪃ᆅ࡛ࡢᤄධࡀᅔ㞴࡞ࡇ࡜࠿ࡽࠊ㖡〇ࡢᨺᑕ⥺ࢩ࣮៖ࡍࡿᚲせࡀ࠶ࡿࠋ

ࣝࢻࡣ┿✵ᐜჾ࡜୍య໬ࡋࡍࡿࡇ࡜࡟ࡋࠊタィ࡟

Fig.5-1 ࡟ PCS ࡢᵓ㐀ࢆ♧ࡍࠋཱྀᚄࡢ኱ࡁ࡞ 4ࡣࢩ࣮ࣝࢻࡢᵓ㐀ࡶ⪃៖ࡋࡓࠋࡲࡓࠊࢱࣥࢢࢫࢸ

ࡘࡢࢥ࢖ࣝ㸦CS0, CS1, MS1, MS2㸧࡜ཱྀᚄࡢᑠ

ࣥࢩ࣮ࣝࢻࡣࠊPCS タ⨨ᚋ࡟ᤄධࡉࢀࡿࡀࠊ㖡ࢩ

ࡉ࡞ 6 ࡘࡢࢥ࢖ࣝ㸦TS1a, TS1b, TS1c, TS1d,࣮ࣝࢻ࡜⤖ྜࡉࢀࡿࡓࡵⲴ㔜ࡢ༙ศࢆ┿✵ᐜჾTS1e, TS1f㸧ࡣࢧ࣏࣮ࢺᵓ㐀୍࡛య໬ࡉࢀࠊࡑࢀ

ࡀཷࡅᣢࡘࡇ࡜࡟࡞ࡿࠋ

ࡒࢀ CS ࢥ࣮ࣝࢻ࣐ࢫࠊTS1 ࢥ࣮ࣝࢻ࣐ࢫ࡜࿧ࡤ
ࢀ࡚࠸ࡿࠋࢥ࣮ࣝࢻ࣐ࢫࡣࠊࢥ࢖ࣝࢆᶵᲔⓗ࡟ࢧ

5.2. ᭷㝈せ⣲ἲ࡟ࡼࡿࢩ࣑࣮ࣗࣞࢩࣙࣥ

࣏࣮ࢺࡍࡿࡔࡅ࡛࡞ࡃఏᑟ෭༷ᵓ㐀ࡶᢸࡗ࡚࠾

᭷㝈せ⣲ἲ㸦Finite Element Method, FEM㸧ࡾࠊᵓ㐀㒊ᮦࡣᙉᗘࡔࡅ࡛ࡣ࡞ࡃᾮయ࣒࣊ࣜ࢘㓄࡜ࡣᩘ್ゎᯒᡭἲࡢ୍ࡘ࡛ࠊ」㞧࡞ᙧ≧࣭ᛶ㉁ ࢆ⟶ࡸఏ⇕ᯈࡢ᪋ᕤᛶࡶ㔜せ࡛࠶ࡿࠋࡲࡓࠊᨺᑕ⥺ᣢࡘᑐ㇟ࢆᑠ㡿ᇦ㸦࣓ࢵࢩࣗࠊせ⣲㸧࡟ศ๭ࡍࡿ࡟ࡼࡿ⇕㈇Ⲵࢆ᭱ᑠ㝈࡟ࡍࡿࡓࡵ࡟ᐦᗘࢆపࡃ

ࡇ࡜࡛㏆ఝࡋࠊ඲యࡢᣲືࢆண ࡋࡼ࠺࡜ࡍࡿࡶࡍࡿᚲせࡀ࠶ࡾࠊࡑࢀࡽࢆ⪃៖ࡋ࡚ࢥ࣮ࣝࢻ࣐ࢫ

ࡢ࡛࠶ࡿࠋ㉸ఏᑟ㟁☢▼ࡢタィࡣ㠀ᖖ࡟」㞧࡞せ⏝ᵓ㐀㒊ရࡢᮦᩱࡣ A5083 ࢔࣑ࣝࢽ࣒࢘ྜ㔠ࡀ⣲ࡀ⤡ࢇ࡛࠸ࡿࡓࡵࠊFEM ゎᯒࡣ㠀ᖖ࡟ᙉຊ࡞

᥇⏝ࡉࢀ࡚࠸ࡿࠋ

ࢶ࣮ࣝ࡜࡞ࡿࠋᮏ⠇࡛ࡣ PCS ࡢ඲యタィࡢࡓࡵࢥ࣮ࣝࢻ࣐ࢫࡣࠊᐊ ࠿ࡽࡢ⇕㈇Ⲵࢆ᭱ᑠ໬ࡍ
ࡿࡓࡵ࡟ࣟࢵࢻ࡟ࡼࡗ࡚┿✵ᐜჾ࡟ᅛᐃࡉࢀࡿࠋ
ࣟࢵࢻ࡟ࡣ㠀☢ᛶ࡛ప⇕ఏᑟ⋡ࡀせồࡉࢀࡿࡓ࡟ FEM ࡟ࡼࡿ㐃ᡂゎᯒࢆ⤂௓ࡍࡿࠋ5.2.1. ゎᯒ⏝ࣔࢹࣝసᡂ

ࡵࠊ୍⯡ⓗ࡞㉸ఏᑟ☢▼࡛ࡣ࢞ࣛࢫ⧄⥔ᙉ໬ࣉࣛᐇ㝿ࡢタィ࡛ࡣࠊ㝈ࡽࢀࡓ᫬㛫ෆ࡛ FEM ゎᯒࢫࢸ࢕ࢵࢡ㸦GFRP㸧ࡀ⏝࠸ࡽࢀࡿࡇ࡜ࡀከ࠸ࠋ

ࢆ⧞ࡾ㏉ࡋࠊࡑࡢ⤖ᯝࢆᇶ࡟ᙧ≧ࠊᵓ㐀㒊ᮦࠊ᪋ࡋ࠿ࡋ࡞ࡀࡽࠊPCS ࡢ㐠㌿⎔ቃ࡟࠾࠸࡚ࣉࣛࢫࢳ

ᕤ᪉ἲࢆ᭱㐺໬ࡋ࡚࠸ࡃࡇ࡜࡟࡞ࡿࠋࡋࡓࡀࡗ

ࢵࢡࡢᨺᑕ⥺࡟ࡼࡾຎ໬ࡀண᝿ࡉࢀࡿࡓࡵࠊࢧ࣏

࡚ࠊ⤖ᯝࡢጇᙜᛶ࡜ಙ㢗ᛶཬࡧゎᯒࡢຠ⋡ᛶࡀ㔜࣮ࢺࣟࢵࢻࡣ Ti-6Al-4V ࢳࢱࣥྜ㔠࡛〇సࡍࡿࡇ

せ࡛࠶ࡿࠋᵓ㐀ࢆ⣽㒊ࡲ࡛ᐃ⩏ࡋ࣓ࢵࢩࣗࡶ⣽࠿࡜࡟ࡋࡓࠋࡃษࡿ஦࡟ࡼࡾ⌧ᐇⓗ࡞ࢩ࣑࣮ࣗࣞࢩࣙࣥࡀྍ
⬟࡛࠶ࡿࡀࠊィ⟬᫬㛫ࡀ⭾኱࡜࡞ࡾホ౯࡟᫬㛫ࢆせࡍࡿࠋ୍᪉ࣔࢹࣝࢆ⡆␎໬ࡋࡍࡂࡿ࡜▷᫬㛫ࡢィ⟬࡛⤖ᯝࡀᚓࡽࢀࡿࡀࠊゎᯒ⤖ᯝࡢጇᙜᛶ࡜ಙ
㢗ᛶࡀపୗࡍࡿࠋ≧ἣ࡟ᛂࡌ࡚┦཯ࡍࡿࡑࢀࡽࢆ
࠺ࡲࡃᩚྜࡉࡏࡓࣔࢹࣝసᡂࡀᚲせ࡜࡞ࡿࠋලయ౛࡜ࡋ࡚ࠊCS ࢥ࢖ࣝࡢࣔࢹࣝసᡂ࡟ࡘ࠸࡚
グ㏙ࡋ࡚࠸ࡃࠋCS1 ࡣෆᚄ 1344 mmࠊཌࡉ 152mmࠊ㛗ࡉ 1391 mm ࡜㠀ᖖ࡟኱ࡁ࡞ࢥ࢖࡛ࣝࠊ
ᵓᡂࡣ Fig. 4-1 ࡛♧ࡉࢀ࡚࠸ࡿᵝ࡟࣏ࣜ࢖࣑ࢻࣇ
࢕࣒ࣝ㸩BT ᶞ⬡࡛⤯⦕ࡉࢀࡓ࢔࣑ࣝࢽ࣒࢘Ᏻᐃ
໬㉸ఏᑟࢣ࣮ࣈࣝࡀ 270 ࢱ࣮ࣥࡢ 9 ᒙᵓ㐀࡟࡞ࡗ࡚࠸ࡿࠋᒙ㛫࡟ࡣఏ⇕⏝࡟ᖜ 75 mmࠊཌࡉ 1)LJ&20(73&6 ࡢᵓ㐀

mm ࡢ 5N㸦99.999%㸧⣧࢔࣑ࣝࢽ࣒࢘෭༷ᯈࡀ࿘

12㸫 5ᮇⓗ࡟ᕪࡋ㎸ࡲࢀ࡚࠾ࡾࠊ㝽㛫ࡣ BT㸩࢚࣏࢟ࢩࡢΰྜᶞ⬡࡛ᇙࡵࡽࢀ࡚࠸ࡿࠋࡲࡓࠊᖜ 4.7 mmࠊ
ཌࡉ 15 mm ࡢ࢔࣑ࣝࢽ࣒࢘Ᏻᐃ໬㉸ఏᑟࢣ࣮ࣈ
ࣝࡣࠊ┤ᚄ 1.2 mmࠊ㖡ẚ 0.9 ࡢ NbTi-Cu ㉸ఏᑟ⥺ 14 ᮏ࠿ࡽᡂࡿࣛࢨࣇ࢛࣮ࢻ᧍⥺࡜⣧࢔࣑ࣝࢽ࣒࢘Ᏻᐃ໬ᮦ࡛ᵓᡂࡉࢀ࡚࠸ࡿࠋ㕲࣮ࣚࢡࢆྵࡴ
☢▼඲యࡢ኱ࡁࡉࡣࠊᖜ 3560 mmࠊ㧗ࡉ 3560mmࠊ㛗ࡉ 6370 mm ࡛࠶ࡾࠊ┤ᚄ 1.2 mm ࡢᑟయࡸཌࡉ 0.2 ࡢ㟁Ẽ⤯⦕ᒙ࠿ࡽ࡞ࡿࣔࢹࣝࢆᐃ⩏ࡍࡿࡢࡣ㠀⌧ᐇⓗ࡛࠶ࡿࠋࡑࡇ࡛ࠊࡲࡎࡣࢥ࢖ࣝ
ࢆ୍ࡘࡢ」ྜᮦᩱ࡜ࡋ࡚ᐃ⩏ࡋ࡚ゎᯒࢆ㐍ࡵࠊ᭱

)LJ ࢥ࢖ࣝ」ྜᮦࡢ⥺⭾ᙇಀᩘ⤊ⓗ࡟ᙳ㡪ࡢ኱ࡁ࠸୍㒊ศ࡟ࡢࡳ⡆᫆ⓗ࡞ࢣ࣮ࣈࣝᵓ㐀ࢆᐃ⩏ࡋࡓゎᯒࢆ⾜ࡗࡓࠋFig. 5-2 ࡟ࢥ࢖ࣝࢆ」ྜᮦᩱ࡜ࡋ࡚ᐃ⩏ࡍࡿ㝿ࡢィ⟬࡟⏝࠸ࡓࢣ࣮ࣈࣝ࿘㎶ࡢ᩿㠃ᵓᡂࢆ♧ࡍࠋࢥ࢖ࣝ」ྜᮦࡣࠊNbTiࠊ㖡ࠊ࢔࣑ࣝࢽ࣒࢘ࠊᶞ⬡࡛ᵓᡂࡉࢀ࡚࠾ࡾࠊࡑࡢయ✚ẚ 1.0:0.9:7.0:1.3 ࡼࡾồࡵࡽࢀࡓྜᡂᐦᗘࡣ 3515 kg/m3 ࡛࠶ࡿࠋࡲ
ࡓࠊࡇࡢࢥ࢖ࣝ」ྜᮦࡣ␗᪉ᛶࢆᣢࡗ࡚࠾ࡾࠊ」ྜᮦᩱࡢ」ྜ๎[12]ࢆ⏝࠸࡚ࠊ┤஺ᗙᶆ⣔ཬࡧ෇⟄ᗙᶆ⣔ࡢࡑࢀࡒࢀࡢ᪉ྥ࡟ᑐࡋ࡚ࠊEX(R)=43.2
GPa, EY(T)=73.7 GPa, EZ=37.8 GPa ࡢᙎᛶಀᩘࢆ
ᐃ⩏ࡋ࡚࠸ࡿࠋ⥺⭾ᙇಀᩘࠊ⇕ఏᑟ⋡ࡶྠᵝࡢ」ྜ๎࡛ィ⟬ࡉࢀ࡚࠾ࡾࠊFig. 5-3, 5-4 ࡟♧ࡍࡼ࠺࡞ᗘ౫Ꮡᛶࢆࡶࡗࡓ⥺⭾ᙇಀᩘ࡜⇕ఏᑟ⋡ࢆࡑࢀࡒࢀࡢᗙᶆ᪉ྥ࡛ᐃ⩏ࡋ࡚࠸ࡿ[13]ࠋPCS ࡢࢥ࢖ࣝࡣ㧗ᨺᑕ⥺⎔ቃ࡟㓄⨨ࡉࢀࡿࡓࡵࠊࢥ࢖ࣝ
ࢆᵓᡂࡍࡿ㔠ᒓᮦᩱࡢ⇕ఏᑟ⋡ࡣࠊ4 ❶࡛グ㏙ࡉࢀࡓ୰ᛶᏊ࡟ࡼࡿຎ໬ࢆ⪃៖ࡍࡿᚲせࡀ࠶ࡿࠋ≉࡟ࢥ࢖ࣝࡢᒙ㛫࡟ᤄධࡉࢀࡿఏ⇕ᯈࡢᮦᩱࡣࠊṧ)LJ ࢥ࢖ࣝ」ྜᮦࡢ⇕ఏᑟ⋡␃᢬ᢠẚ㸦Residual Resistivity Ratio: RRR㸧ࡀᩘ༓ࡢ㉸㧗⣧ᗘ࢔࣑ࣝࢽ࣒࡛࢘࠶ࡿࡀࠊࢥ࢖ࣝෆ
ࡢ࢔࣑ࣝࢽ࣒࢘ࡢ⇕ఏᑟ⋡ࡣ඲࡚ RRR=30 ࡢ್࡛タᐃࡉࢀ࡚࠸ࡿࠋ
ヲ⣽ࡣ 5. 2. 3. 㡯࡛グ㏙ࡉࢀࡿࡀࠊ෇⟄ᆺࡢ」ྜᮦ࡛ᐃ⩏ࡉࢀࡓࢥ࢖ࣝࣔࢹ࡛ࣝゎᯒࢆ⾜࠸ࠊࢥ)LJ ࢥ࢖ࣝ」ྜᮦࡢᵓ㐀)LJ ୍㒊ศࡔࡅヲ⣽ᵓ㐀ࡢࣔࢹࣝ12㸫 6࢖ࣝࡢෆ㒊ᛂຊࡀチᐜ್௨ୗ࡟࡞ࡿᵝ࡟ࢧ࣏࣮ࢺᵓ㐀࡞࡝ࡢᙧ≧ࢆ᭱㐺໬ࡋࡓࠋࡋ࠿ࡋࠊ」ྜᮦ
ࣔࢹ࡛ࣝࡣࠊ㉸ఏᑟࢣ࣮ࣈࣝࠊᏳᐃ໬ᮦࠊ⤯⦕ᮦ࡞࡝ಶࠎࡢᵓ㐀㒊ᮦ࡟ᑐࡋุ࡚᩿ࡀ㞴ࡋ࠸ࠋࡑࡇ
࡛ࠊFig. 5-5 ࡟♧ࡉࢀࡿࡼ࠺࡟ᛂຊࡀ㧗ࡃ࡞ࡿ୍㒊ศ࡟ᐇ㝿ࡢࢥ࢖ࣝᵓ㐀࡟㏆࠸ᙧ≧࡛ࣔࢹࣝࢆ
෌ᐃ⩏ࡋ࡚ゎᯒࢆ⾜ࡗࡓࠋ5.2.2. 㟁☢ሙゎᯒࢥ࢖ࣝࡢཬࡧ㕲࣮ࣚࢡࡢ㓄⨨ࠊࢥ࣮ࣝࢻ࣐ࢫ㒊ရࡢᇶᮏᙧ≧᭱㐺໬ࡢࡓࡵ࡟ 2 ḟඖ෇⟄ࣔࢹࣝ࡟)LJ ࢥ࢖ࣝ」ྜᮦࡢ⇕ఏᑟ⋡ࡼࡿ☢ሙゎᯒࢆ⾜ࡗࡓࠋ㕲࣮ࣚࢡ࡟㛵ࡋ࡚ࠊᐇ㝿ࡢ〇స࡟࠾࠸࡚㒊ရࢆ⤌ࡳྜࢃࡏࡿᵓ㐀࡟࡞ࡿࢀ༑ศప࠸್࡜࡞ࡗ࡚࠸ࡿࡀࠊ㐠㌿ࢆ⥅⥆ࡍࡿ࡟ࡓࡵࠊࣔࢹ࡛ࣝࡣ㕲࣮ࣚࢡࢆศ๭ࡋ㝽㛫㸦✵Ẽᒙ㸧ࡘࢀ࡚ࠊᨺᑕ⥺࡟ࡼࡿ⇕ఏᑟ⋡ࡢຎ໬࡟ࡼࡗ࡚ࢥ

ࢆ 1 mm タࡅ࡚࠸ࡿࠋࡲࡓࠊࣔࢹࣝ࡟ࡣ࣑࣮ࣗ࢜࢖ࣝࣥ ㍺ ㏦ ࢯ ࣞ ࣀ ࢖ ࢻ (Muon transport solenoid:ᗘࡀୖ᪼ࡋ㈇Ⲵ⋡ࡀቑຍࡍࡿࡢ࡛ὀពࡀᚲせ࡛࠶ࡿࠋ

MTS)ࡢᙳ㡪ࢆ⪃៖ࡍࡿࡓࡵ࡟ࠊୖὶ 10 ಶࡢࢥ࢖

Table 5-1 ࡟ࢥ࢖ࣝࡢࢹࢨ࢖ࣥࣃ࣓࣮ࣛࢱ࡜ࢥ

ࣝ࡜ MTS ⏝ࡢ㕲࣮ࣚࢡࡶࣔࢹࣝ࡟ᐃ⩏ࡉࢀ࡚࠸࢖ࣝ࡟స⏝ࡍࡿ㟁☢ຊࡀࡲ࡜ࡵࡽࢀ࡚࠸ࡿࠋ☢ሙࡿࠋᐇ㝿ࡢ MTS ࡣ 90 ᗘ‴᭤ࡋࡓᙧ≧ࢆࡋ࡚࠸ࡿ

ࡀ㧗ࡃ࡞ࡗ࡚࠸ࡿ CS ࢥ࣮ࣝࢻ࣐ࢫࡢࢥ࢖ࣝ࡟኱ࡀࠊPCS ࡢゎᯒ࡟࠾࠸࡚ࠊࡑࡢᙳ㡪ࡣ↓ど࡛ࡁࡿࡁ࡞ࣇ࣮ࣉᛂຊ㸦R ᪉ྥ㸧ࡀⓎ⏕ࡋ࡚࠸ࡿࠋ≉࡟ࡶࡢ࡜ࡋ࡚┤⥺ᵓ㐀࡟ࡋ࡚࠸ࡿࠋFig. 5-6 㸦A㸧

CS1 ࡟ࡣ㠀ᖖ࡟኱ࡁ࡞ࣇ࣮ࣉຊࡀⓎ⏕ࡍࡿࡓࡵࠊ

࡟ 2 ḟඖ෇⟄ᑐ⛠ࣔࢹࣝࡢ☢ሙศᕸ࡜㸦B㸧࡟ࢯࢥ࢖ࣝࡀ◚ቯࡉࢀ࡞࠸ࡼ࠺࡞ᙉຊ࡞ࢧ࣏࣮ࢺᵓ

ࣞࣀ࢖ࢻ㍈ୖࡢ☢ሙࡢᙉࡉࢆ♧ࡍࠋ☢ሙࡢ᭱኱್㐀ࡀᚲせ࡟࡞ࡿࠋ୍᪉ࠊTS1 ࢥ࣮ࣝࢻ࣐ࢫࡣ㍈᪉ࡣ 5.4 T ࡜࡞ࡾࠊCS1 ࢥ࢖ࣝࡢෆഃ୰ኸ࡟఩⨨ࡋྥࡢᡂศࡀ㠀ᖖ࡟㧗ࡃ࡞ࡗ࡚࠾ࡾࠊPCS ࢆ༢⊂࡛࡚࠸ࡿࠋ㉸ఏᑟ⣲⥺ࡢ㈇Ⲵ⋡ࡣ 0.2%⛬ᗘ࡜ぢ✚ࡽບ☢ࡋࡓሙྜࠊCS ࢥ࣮ࣝࢻ࣐ࢫഃ࡟ 100 kN ࡢ

7DEOH ࢥ࢖ࣝࡢタィࣃ࣓࣮ࣛࢱ࡜㟁☢ຊࡢ⤖ᯝ
PCS: ”ON”, MTS: ”ON”

タィࣃ࣓࣮ࣛࢱ
ID

PCS: ”ON”, MTS: ”OFF”

Cold mass

Cold mass

ෆᚄ

ཌࡉ

㛗ࡉ

㟁ὶ್

FR

FZ

FZ

FR

FZ

FZ

[mm]

[mm]

[mm]

[A]

[kN]

[kN]

[kN]

[kN]

[kN]

[kN]

152

180

5568

5762

5568

5762

152

1391

60404

2371

60403

2370

84

1468

26467

-3108

26463

-3112

MS2

118

721

15139

-4943

15117

-4969

TS1a

16

200

2700

194

-3

194

-3

TS1b

48

240

2581

1056

-53

1052

-55

64

200

2700

1148

-8

1137

-13

TS1d

64

320

2619

1686

-42

1648

-66

TS1e

48

200

2538

853

58

818

20

96

350

2916

3001

-321

2894

-806

CS0
CS1
MS1

TS1c

TS1f

1344

500

820

2700

12㸫 7

81

-368

51

-923

ຊ࡛ᘬࡁ㎸ࡲࢀࡿࠋ≉࡟ TS3 ࢥ࢖ࣝࡢຊࡀᙉ࠸ࡓ

⦰㔞ࡣࠊNb ᡂศࡀධࡗ࡚࠸ࡿࡓࡵࠊእഃࡢ࢔ࣝ

ࡵࠊཱྀᚄࡢ␗࡞ࡿࢥ࢖ࣝ㛫ࡢࢧ࣏࣮ࢺࡀኚᙧࡋ࡞࣑ࢽ࣒࢘〇ࢩ࢙ࣝࡼࡾࡶⱝᖸᑠࡉࡃ࡞ࡗ࡚࠸ࡿࠋ

࠸ࡼ࠺࡞ᙉຊ࡞ࣜࣈᵓ㐀ࡀᚲせ࡜࡞ࡿࠋࡲࡓࠊࡇ

ࡇࢀࡣ෭༷࡟ࡼࡾࢥ࢖ࣝࢆ⥾ࡵ௜ࡅࡿࡇ࡜࡟࡞

ࡢ኱ࡁ࡞㍈᪉ྥ㟁☢ຊࡣࠊ┿✵ᐜჾ࠿ࡽࢥ࣮ࣝࢻ

ࡿࡢ࡛ࠊບ☢᫬ࡢࢥ࢖ࣝࡢࣉ̿ࣉᛂຊࢆ 9 MPa ⛬࣐ࢫࢆᨭ࠼ࡿࢧ࣏࣮ࢺࣟࢵࢻࡸ┿✵ᐜჾ࡟ࡶᙳ

ᗘ⦆࿴ࡉࡏࡿࠋࡋ࠿ࡋࠊࡇࡢ෭༷࡟ࡼࡿຠᯝࡣタ㡪ࢆཬࡰࡍࡢ࡛༑ศ࡟⪃៖ࡍࡿᚲせࡀ࠶ࡿࠋィࡢ⿱ᗘ࡜ࡋ࡚ᢅ࠸ࠊࢧ࣏࣮ࢺࢩ࢙ࣝࡣࡑࡢᵓ㐀ࢩ࣑࣮ࣗࣞࢩࣙࣥࡣࠊ2 ḟඖ෇⟄ᑐ⛠ࣔࢹ࡛ࣝࡢࡳ࡛チᐜᛂຊ௨ୗ࡟࡞ࡿᵝ࡟タィࡉࢀ࡚࠸ࡿࠋ

ࡢㄪᩚࡢᚋ࡟ 3 ḟඖࣔࢹࣝ࡟ᣑᙇࡉࢀࡓࠋ㸱ḟඖ

Fig. 5-7 ࡟෭༷࡜㟁☢ຊࡢ୧᪉ࢆ⪃៖ࡋࡓ CS

ࣔࢹ࡛ࣝࡣࠊࢥ࢖ࣝࡢᙧ≧ࠊ㓄⨨ࠊ㟁ὶᐦᗘ➼ࡣࢥ࣮ࣝࢻ࣐ࢫࡢ࣑࣮ࢮࢫᛂຊศᕸࢆ♧ࡍࠋ㸦A㸧ࡣ

2 ḟඖࣔࢹࣝ࡜ྠᵝ࡛ࠊ㕲࣮ࣚࢡࡢᙧ≧ࡔࡅࡀ෇ࢥ࢖ࣝ」ྜᮦࣔࢹࣝࡢ⤖ᯝࢆ♧ࡋ࡚࠾ࡾࠊཌࡉ 50⟄࠿ࡽ⟽ᆺ࡟ኚࢃࡗ࡚࠸ࡿࠋFig. 5-6 㸦B㸧࡟ 2 ḟmm ࡢࢩ࢙ࣝࡢእഃ୰ኸ࡟ࠊཌࡉ 70 mmࠊ㛗ࡉඖࣔࢹࣝ࡜ 3 ḟඖࣔࢹࣝࡢࢯࣞࣀ࢖ࢻ㍈ୖࡢ☢ሙ

700 mm ࡢࣜࣈࢆ㏣ຍࡍࡿࡇ࡜࡛ࠊCS1 ࢥ࢖ࣝᛂࡢᙉࡉࢆẚ㍑ࡋ࡚࠸ࡿࡀࠊ࡯࡜ࢇ࡝ኚ໬ࡀぢࡽࢀຊࢆチᐜ್௨ୗࡢ 54 MPa ࡟ࡍࡿࡇ࡜ࡀ࡛ࡁࡿࠋ

࡞࠸ࠋ3 ḟඖࣔࢹ࡛ࣝࡢ㐃ᡂゎᯒࢆ⾜࠺ࡓࡵ࡟ࠊ

෭༷ࢆ⪃៖ࡋ࡞࠸ሙྜࡢᛂຊࡣチᐜ್࡜ྠ➼ࡢィ⟬ࡉࢀࡓࢥ࢖ࣝࡢ㟁☢ຊ⠇Ⅼゎࢆḟ⠇ࡢᵓ㐀

63 MPa ⛬ᗘ࡛࠶ࡿࠋ
㸦B㸧࡜㸦C㸧ࡣᛂຊࡀ᭱ࡶ

ゎᯒ࡟ධຊࡋ࡚࠸ࡿࠋ

㧗࠸ CS1 ࢥ࢖ࣝࡢෆഃ୰ኸ࡟୍㒊ศࡔࡅ⌧ᐇⓗ࡞ࣔࢹࣝ㸦3 ࢱ࣮ࣥࠊ3 ᒙ㸧ࢆᐃ⩏ࡋࡓィ⟬ࡢ⤖ᯝ

5.2.3. ᵓ㐀ゎᯒࢆ♧ࡋ࡚࠸ࡿࠋࢥ࢖ࣝᵓ㐀࡟࠾࠸࡚ࠊNbTi ࣛࢨࣇ

PCS ࡢᐇ〇స࡟ྥࡅ࡚ࠊCS ࢥ࣮ࣝࢻ࣐ࢫࠊTS1࢛࣮ࢻࢣ࣮ࣈࣝࡢᛂຊࡀ᭱ࡶ㧗ࡃ࡞ࡾࠊ᭱኱್ࡣ

ࢥ࣮ࣝࢻ࣐ࢫཬࡧᨺᑕ⥺ࢩ࣮ࣝࢻࢆྵࡴ┿✵ᐜ

110 MPa ࡛࠶ࡿࠋ⤌ᡂ࡟ࡶࡼࡿࡀ୍⯡ⓗ࡞ NbTi

ჾࡢ 3 ḟඖᵓ㐀ゎᯒࢆ⾜ࡗࡓࠋࡢᘬᙇᙉࡉࡣ 1 GPa ௨ୖ࡛࠶ࡾࠊࢣ࣮ࣈࣝࡣ༑ศ
࡞⿱ᗘࢆᣢࡗ࡚࠸ࡿࡇ࡜ࡀศ࠿ࡿࠋࡲࡓࠊ࢔࣑ࣝ

A. CS ࢥ࣮ࣝࢻ࣐ࢫ

ࢽ࣒࢘Ᏻᐃ໬ᮦࡢᛂຊࡣ 60 MPa ⛬ᗘ࡜࡞ࡾチᐜCS ࢥ࣮ࣝࢻ࣐ࢫࡣ 5. 2. 1. 㡯࡛㏙࡭ࡽࢀࡓࡼ

್࡟㏆࠸ࠋ࠺࡟ࢥ࢖ࣝࢆ␗᪉ᛶ」ྜᮦᩱ࡛ᐃ⩏ࡋࠊࢧ࣏࣮ࢺ
ᙧ≧ࢆ⾜ࡗࡓࠋࢥ࢖ࣝࡢࢧ࣏࣮ࢺࡶ㠀ᖖ࡟኱ࡁ࡞
CS1 ࡢࣇ࣮ࣉຊ࡟ᑐࡋ࡚ࢥ࢖ࣝࡀ◚ቯࡉࢀ࡞࠸
ࡼ࠺࡞ᙉຊ࡞ࢧ࣏࣮ࢺࡀᚲせ࡛࠶ࡿࡀࠊࢧ࣏࣮ࢺ
ࡶᨺᑕ⥺࡟ࡼࡿⓎ⇕※࡟࡞ࡿࡓࡵ㍍㔞໬ࡶồࡵࡽࢀࡿࠋ5. 1. ⠇࡛㏙࡭ࡓࡼ࠺࡟ࠊࢥ࢖ࣝࡢ෭༷ࡶ
⪃៖ࡋ࡚ࢧ࣏࣮ࢺࢩ࢙ࣝࡣ A5083 ࢔࣑ࣝࢽ࣒࢘
ྜ㔠࡛〇సࡍࡿࡇ࡜࡟ࡋࠊࡑࡢᙧ≧ࡣࢥ࢖ࣝࡢෆ
㒊ᛂຊࡀチᐜ್௨ୗ࡟࡞ࡿᵝ࡟᭱㐺໬ࡉࢀࡓࠋࡑ
ࡢ㝿ࡢチᐜᛂຊࡣࠊ࢔࣑ࣝࢽ࣒࢘Ᏻᐃ໬ᮦࡢ 4.5
K ࡛ࡢ 0.2%⪏ຊࡢᐇ ್ࢆᇶ‽࡜ࡋࠊࡑࡢ 3 ศ
ࡢ 2 ࡛࠶ࡿ 63.3 MPa ࡟タᐃࡉࢀࡓࠋ
ḟ㡯࡛⇕ゎᯒࡢヲ⣽࡟ࡘ࠸࡚㏙࡭ࡿࡀࠊᮏᵓ㐀ゎᯒ࡛ࡶᗘศᕸ࡜⇕཰⦰ࡀཬࡰࡍᙳ㡪ࡣ⪃៖ࡉࢀ࡚࠸ࡿࠋࢥ࣮ࣝࢻ࣐ࢫࡢ୺せ㒊ရࡣ෭༷⟶ࡶྵࡵ࡚࢔࣑ࣝࢽ࣒࡛࢘ᵓᡂࡉࢀ࡚࠾ࡾࠊ෭༷࡟ࡼ
ࡿᛂຊࡣᑠࡉࡃ࡞ࡗ࡚࠸ࡿࠋࢥ࢖ࣝ」ྜᮦᩱࡢ཰

12㸫 8)LJ&6 ࢥ࣮ࣝࢻ࣐ࢫࡢ࣑࣮ࢮࢫᛂຊศᕸ

ᐇ㝿ࡢ CS1 ⏝ࡢࢧ࣏࣮ࢺࢩ࢙ࣝࡣࠊ⤌❧ࡸ〇㐀᪉ἲࢆ᳨ウࡋࠊ⁐᥋ヨ㦂➼ࡶ⾜ࡗࡓࡀࠊ᭱⤊ⓗ࡟㏣ຍࣜࣈศࡀ୍య໬ࡉࢀࡓ୰ኸ㒊ࡢཌࡳࡀ 120
mm ࣜࣥࢢ㘫㐀ရࢆᇶ࡟〇సࡉࢀࡓࠋ

B. TS1 ࢥ࣮ࣝࢻ࣐ࢫ
TS1 ࢥ࢖ࣝࡢࣇ࣮ࣉຊࡣᑠࡉࡃࢩ࢙ࣝࡢእഃ
࡟⿵ᙉᵓ㐀ࢆᚲせ࡜ࡋ࡞࠸ࡀࠊ㠀ᖖ࡟ᙉ࠸㛗ᡭ᪉ྥࡢ㟁☢ຊࢆ⪃៖ࡋࡓタィࡀᚲせ࡛࠶ࡿࠋFig. 58 ࡟ᙧ≧᭱㐺໬ࡉࢀࡓ TS1 ࢥ࣮ࣝࢻ࣐ࢫࢧ࣏࣮ࢺ
ࡢᛂຊศᕸࢆ♧ࡍࠋ50 MPa ⛬ᗘࡢࡸࡸ㧗࠸ᛂຊࡀࡳࡽࢀࡿࡀࠊA5083-H113 ᮦࡢ 0.2%⪏ຊ 280
MPa ࡼࡾࡣ༑ศ࡟ᑠࡉࡃ࡞ࡗ࡚࠸ࡿࠋ
ᛂຊࡢ㧗࠸㒊ศࡢ୍ࡘࡣ㛗ᡭ᪉ྥࣟࢵࢻࡢᨭ
ᣢྎᗙ࡛࠶ࡿࠋ㛗ᡭ᪉ྥࣟࢵࢻࡣࠊ2 ␒┠ࡢࢥ࢖ࣝ㸦TS1b㸧ࡢࢩ࢙ࣝእ࿘㒊࡟タࡅࡽࢀࡿྎᗙ࡟ᅛ
ᐃࡉࢀࡿࠋࡇࡢྎᗙ㒊ศ࡟㠀ᖖ࡟኱ࡁ࡞ᛂຊࡀⓎ⏕ࡋࠊࢩ࢙ࣝ࡜ྎᗙ㛫ࡢ࣎ࣝࢺࡸ⁐᥋࡛ࡢ⥾⤖࡛ࡣᙉᗘࡀ୙㊊ࡋࡓࠋࡑࡇ࡛ࠊTS1b ࢩ࢙ࣝࡣࣜࣥ
ࢢ㘫㐀ရࢆᇶ࡟ྎᗙ㒊ศࢆṧࡍࡼ࠺࡞๐ࡾฟࡋ
ຍᕤ࡟ࡼࡾ〇సࡉࢀࡓࠋࡶ࠺୍ࡘࡢᛂຊࡢ㧗࠸㒊ศࡣࠊ᭱ᚋࡢࢥ࢖ࣝ㸦TS1f㸧ࡢࣇࣛࣥࢪഃࡢࣇ࢕
ࣥᵓ㐀ࡢ᰿ᮏ࡛࠶ࡿࠋࢯࣞࣀ࢖ࢻ㍈᪉ྥࡢ㟁☢ຊࡣ୍ࡘࡔࡅෆ┤ᚄࡀ኱ࡁ࠸ TS1f ࢥ࢖ࣝࡀᨭ㓄ⓗ࡛࠶ࡿࡓࡵࠊTS1f ࡜ TS1e ࢥ࢖ࣝ㛫ࡢࣇࣛࣥࢪ࡟
ࡣ኱ࡁ࡞ࡏࢇ᩿ຊࡀస⏝ࡋࠊኚᙧཬࡧᛂຊࡀ㧗ࡃ࡞ࡿࠋࡑࡇ࡛ࠊᲓᏊࡢᵝ࡞ᙧ≧ࡢࣇ࢕ࣥᵓ㐀࡛
TS1b ࢩ࢙ࣝࡢࢧ࣏࣮ࢺྎᗙ࡜㐃⤖ࡉࡏࡿࡇ࡜࡟
ࡼࡾᵓ㐀ࢆᙉ໬ࡋ࡚࠸ࡿࠋ

)LJ ┿✵ᐜჾࡢゎᯒࣔࢹࣝ

C. ┿✵ᐜჾ
┿✵ᐜჾࡣࠊࢥ࣮ࣝࢻ࣐ࢫࡸ⇕㍽ᑕࢩ࣮ࣝࢻࢆ
᱁⣡ࡍࡿ᩿⇕┿✵࡜ᶆⓗ࡟㝧Ꮚࣅ࣮࣒ࢆᙜ࡚ࣃ
࢖࢜ࣥࡸ࣑࣮ࣗ࢜ࣥࢆ⏕ᡂࡍࡿࣅ࣮࣒┿✵ࡢ㝸㞳ࡉࢀࡓ 2 ࡘ✵㛫ࡀ࠶ࡿࠋFig. 5-9 ࡟┿✵ᐜჾゎᯒ⏝ࡢ 3 ḟඖࣔࢹࣝࢆ♧ࡍࠋ᩿⇕┿✵ᒙ࡟࠾࠸࡚ࠊ
CS ࢥ࣮ࣝࢻ࣐ࢫ࡜ TS1 ࢥ࣮ࣝࢻ࣐ࢫࡢ㛫࡟ࡣ୰㛫ࣇࣛࣥࢪ࡜࿧ࡤࢀࡿᵓ㐀యࡀ࠶ࡿࡀࠊᶵᲔⓗ࡞ᙉᗘࢆ⿵࠺ࡓࡵࡢ≀࡛࠶ࡾࠊẼᐦᵓ㐀࡟ࡣ࡞ࡗ࡚
࠸࡞࠸ࠋෆⶶࡉࢀࡿ⣙ 9 t ࡢᨺᑕ⥺ࢩ࣮ࣝࢻࡢⲴ
㔜ࡣ୰㛫ࣇࣛࣥࢪ࡜┿✵ᐜჾෆ⟄࡛ཷࡅᣢࡗ࡚
࠾ࡾࠊ᭦࡟⌧ᆅ࡛ᤄධࡉࢀࡿ 40 t ࡢࢱࣥࢢࢫࢸࣥ
ྜ㔠〇ࡢᨺᑕ⥺ࢩ࣮ࣝࢻࡢඛ➃ࡣෆⶶࢩ࣮ࣝࢻ
࡟᥋⥆ࡉࢀࡿࡓࡵࠊ✌ാᯫྎࡢࡶྵࡵࡓ⣙ 80 t ࡢⲴ㔜ࡢ༙ศࡶ㈇Ⲵࡉࢀࡿࠋࣅ࣮࣒┿✵ࡢ୧ഃ┿✵Ẽᐦࡣࠊࡑࢀࡒࢀࣆ࣮ࣟࢩ࣮ࣝ࡜࿧ࡤࢀࡿ 0.6
MPa ✵Ẽᅽ࡛ᯖࡢᵝ࡟⭾ࡽࡲࡏࡓࢲ࢖࢔ࣇ࣒ࣛ
࡜ࣇࣛࣥࢪࡢ᥋ゐ࡟ࡼࡗ࡚⾜ࢃࢀࡢ࡛ࠊ㛗ᡭ᪉ྥ࡟ᅽ⦰ຊࡀస⏝ࡍࡿࠋFig. 5-9 ࡟࠾࠸࡚ࠊࣔࢹࣝ
࡟ࡣᨺᑕ⥺ࢩ࣮ࣝࢻഃࡢࣇࣛࣥࢪ࡟ࡣ 18.2 t ࡛ᕥྥࡁࠊMTS ഃࡣྑྥࡁ࡟ 6.5 t ࡢⲴ㔜ࢆᐃ⩏ࡋ࡚࠸ࡿࠋᵓ㐀ゎᯒ࡛ࡣᆅ㟈ࡶ⪃៖ࡋ᭱኱ࡢⲴ㔜࡜ࡋ࡚㖄┤ୗྥࡁ࡟ 2G ࡢຍ㏿ᗘ୚࠼࡚࠸ࡿࠋ
Fig. 5-10 㸦A㸧࡟ຍ㏿ᗘࠊ኱Ẽᅽࠊࣆ࣮ࣟࢩ࣮
ࣝᅽຊࠊ㟁☢ຊࢆ⪃៖ࡋࡓ┿✵ᐜჾ඲యࡢ࣑࣮ࢮ
ࢫᛂຊศᕸࢆ♧ࡍࠋ┿✵ᐜჾࡣ SUS304 ࢫࢸࣥࣞࢫ㗰࡛〇సணᐃ࡛࠶ࡾࠊチᐜᛂຊࡣᘬᙇ࡛ 130
MPaࠊ⁐᥋㒊࡛ 80 MPa ࡜ࡋ࡚࠸ࡿࠋ2 ࡘࡢᨺᑕ⥺ࢩ࣮ࣝࢻࡢⲴ㔜ࢆཷࡅᣢࡘ CS ࢥ࣮ࣝࢻ࣐ࢫഃ

)LJ76 ࢥ࣮ࣝࢻ࣐ࢫࡢᛂຊศᕸ

ࡢࢭࣥࢱ࣮ࣜࣥࢢ࡟ࡣ㧗࠸ᛂຊࡀⓎ⏕ࡋ࡚࠸ࡿ12㸫 9ࡿ෭༷⟶ࡢᙳ㡪ࢆ᭱ᑠ໬ࡋ࡚࠸ࡿࠋࢥ࣮ࣝࢻ࣐ࢫ
ࢧ࣏࣮ࢺࡢᮦᩱ࡛࠶ࡿ A5083 ࡣࠊ௚ࡢ࢔࣑ࣝᮦ
ᩱ࡜ẚ㍑ࡋ࡚ࡶ⇕ఏᑟ⋡ࡀప࠸ࠋ(Fig. 5-4 ཧ↷)ࢥ࣮ࣝࢻ࣐ࢫࢧ࣏࣮ࢺࡢఏ⇕ࡣࢥ࢖ࣝࡢ෭༷࡟
ࡶᐤ୚ࡍࡿࡓࡵࠊ෭༷⟶࡜ࢧ࣏࣮ࢺྎᗙࡢ㛫࡟㸲N ⣧࢔࣑ࣝࢽ࣒࢘〇ࡢ෭༷ྎᗙࢆタࡅ࡚ࠊࢥ࣮ࣝ
ࢻ࣐ࢫࢧ࣏࣮ࢺࡢ ᗘᕪࢆᑠࡉࡃࡋ࡚࠸ࡿࠋ
෭༷࡟ࡼࡿ ᗘศᕸࠊ⇕཰⦰࡟ࡼࡿኚ఩ࡸᛂຊ
ࡢᙳ㡪ࢆㄪ࡭ࡿࡓࡵ࡟⇕ゎᯒࢆ⾜ࡗࡓࠋFig. 5-11
࡟ CS ࢥ࣮ࣝࢻ࣐ࢫࡢ⇕ゎᯒ᮲௳ࢆ♧ࡍࠋࢳࢱࣥ
ྜ㔠〇ࡢࢧ࣏࣮ࢺࣟࢵࢻࡢඛ➃ࡣ┿✵ᐜჾ࡟ᅛᐃࡉࢀࡿࡓࡵ 300 K ࡢ ᗘࢆᐃ⩏ࡋ࡚࠸ࡿࠋࣟࢵ
ࢻࡣᐊ࠿ࡽࡢ⇕ࢆ┤᥋ࢥ࣮ࣝࢻ࣐ࢫ࡟ఏ࠼࡞

࠸ࡓࡵ࡟ࠊ70 K ࡢ⇕㍽ᑕࢩ࣮ࣝࢻ࡟⇕ⓗ࡟࢔࣮ࣥ࢝ࡉࢀ࡚࠸ࡿࠋࢥ࣮ࣝࢻ࣐ࢫ⾲㠃࡬ࡢ㍽ᑕ࡟ࡼࡿ⇕㈇Ⲵࡣ 1.25 W ࡜ぢ✚ࡽࢀ࡚࠸ࡿࠋᨺᑕ⥺࡟ࡼ

)LJ ┿✵ᐜჾࡢᛂຊศᕸࡀࠊチᐜ್௨ୗ࡜࡞ࡗ࡚࠸ࡿࠋ୍᪉ TS1 ࢥ࣮ࣝࢻ࣐ࢫഃࡣࢯࣞࣀ࢖ࢻ㍈᪉ྥࡢ㧗࠸㟁☢ຊࡢᙳ㡪࡛チᐜ್ࡼࡾࡶ㧗࠸ᛂຊࡀⓎ⏕ࡋ࡚࠸ࡿࠋࡑࡇ
࡛ࠊ┿✵ᐜჾࡢ TS1 ഃࡔࡅࡢࣔࢹࣝࢆ〇సࡋࣜࣈࡢᙧ≧᭱㐺໬ࢆ⾜ࡗࡓࠋࡑࡢ⤖ᯝࢆ Fig. 5-10㸦B㸧࡜㸦C㸧࡟♧ࡍࠋ
㸦B㸧ࡢሙྜࠊ┿✵ᐜჾእഃ࡜୰
㛫࡟㠀ᖖ࡟ᒅᙉ࡞ࣜࣈࢆከᩘྲྀࡾ௜ࡅࡿᚲせࡀ࠶ࡾࠊ᭱ෆᒙࡢࣇࣛࣥࢪ࡜ෆ⟄ࡢ௜ࡅ᰿ࡣࠊ✵㛫ⓗไ㝈ࡼࡾ୍య≀ࢆ‴᭤࡟ษ๐ࡋࡓᵝ࡞ᙧ≧ࡀᚲせ࡟࡞ࡿࠋ
㸦C㸧ࡣ㙾ᯈࢆ౑ࡗ࡚᭱㐺ࡉࢀࡓᙧ≧࡛࠶ࡿࠋ୧᪉ࡢᵓ㐀࡛ᛂຊࡣチᐜ್ࢆୗᅇࡗ࡚࠸
ࡿࡀࠊ࡝ࡕࡽࡢᙧ≧ࢆ᥇⏝ࡍࡿ࠿ࡣ〇㐀࣓࣮࣮࢝࡟୍௵ࡍࡿࡇ࡜࡟ࡋࡓࠋ

ࡿⓎ⇕ࡀࢥ࣮ࣝࢻ࣐ࢫ࡬ࡢ⇕㈇Ⲵࡢ᭱኱࡜࡞ࡗ
࡚࠾ࡾࠊᨺᑕ⥺ࢩ࣑࣮ࣗࣞࢩࣙࣥ࡟ࡼࡾ CS ࢥ࣮ࣝࢻ࣐ࢫࡢⓎ⇕㔞ࡣ 190 W ࡜ぢ✚ࡽࢀ࡚࠸ࡿࠋ
ᨺᑕ⥺࡟ࡼࡿ㧗⣧ᗘ࢔࣑ࣝࢽ࣒࢘෭༷ᯈࡢ⇕ఏᑟ⋡ࡢຎ໬ࢆ⪃៖ࡋࠊṧ␃᢬ᢠẚ 50 ࡢ⇕ఏᑟ⋡ࢆᐃ⩏ࡋ࡚࠸ࡿࠋࡇࢀࡣ 4.5 K ࡛ࡢ⇕ఏᑟ⋡ࡀ
95%␗ᖖపୗࡋ࡚࠸ࡿࡇ࡜ࢆ♧ࡋ࡚࠸ࡿࠋࡲࡓࠊ
ὶయࡸ⟶ෆࡢ᮲௳࡟኱ࡁࡃ౫Ꮡࡍࡿࡓࡵ෭༷᮲
௳ࡢᐃ⩏ࡣ㞴ࡋ࠸ࡀࠊᮏࣔࢹ࡛ࣝࡣ෭༷⟶ࡢෆഃ࡟⿱ᗘࢆᣢࡗࡓ 4.5 K ࡛ 600 W/(m2࣭K)ࡢ⇕ఏ㐩ಀᩘࢆᐃ⩏ࡋ࡚࠸ࡿࠋ
Fig. 5-12 ࡟ CS ࢥ࣮ࣝࢻ࣐ࢫࢧ࣏࣮ࢺࡢ ᗘศᕸࢆ♧ࡍࠋ⇕࢔࣮ࣥ࢝ࡢຠᯝ࡛ࢧ࣏࣮ࢺᵓ㐀࡟ࡼࡿᐊ ࠿ࡽࡢ⇕ὶධ㔞ࡣᑠࡉࡃ࡞ࡾࠊࢥ࣮ࣝࢻ࣐
ࢫࡢࢧ࣏࣮ࢺྎᗙ㒊ศ࡛ࡶ

5.2.4. ⇕ゎᯒ
4 ❶࡛㏙࡭ࡽࢀࡓࡼ࠺࡟ PCS ࡢࢥ࢖ࣝࡣᵝࠎᗘࡣ 6.4 K ⛬ᗘ࡛࠶ࡿࠋ෭༷⟶ࡢ⤒㊰࡜෭༷ྎᗙࡢ᭱㐺໬࡟ࡼࡾࠊⓎ࡞ᨺᑕ⥺ࡢᙳ㡪ࢆ᭱ᑠ໬ࡍࡿࡓࡵ࡟ࠊ෭༷⟶ࢆ⏝࠸ࡓఏᑟ෭༷ἲᘧࡀ᥇⏝ࡉࢀ࡚࠸ࡿࠋPCS ࡜
MTS ࡣࠊ┤ิ࡟᥋⥆ࡉࢀࡓ෭༷⟶ࢆ௓ࡋ෭෾ᶵ
࠿ࡽ౪⤥ࡉࢀࡿ 2 ᒙὶ࣒࣊ࣜ࢘࡟ࡼࡾ෭༷ࡉࢀࡿ
[14]ࠋ࢔࣑ࣝࢽ࣒࢘〇ࡢ෭༷⟶ࡣࢧ࣏࣮ࢺࢩ࢙ࣝ
ࡢእഃ࡟⁐᥋࡛ྲྀࡾ௜ࡅࡽࢀࠊࢥ࢖ࣝᒙ㛫࡟ᕪࡋ㎸ࡲࢀ࡚࠸ࡿ㧗⣧ᗘ࢔࣑ࣝࢽ࣒࢘ఏ⇕ᯈࡣࠊࡲ࡜
ࡵ࡚෭༷⟶ࡢ᰿ඖ࡟⁐᥋ࡉࢀࡿࠋᮏ☢▼࡛ࡣ⁐᥋ࣅ࣮ࢻ௜ࡁ෭༷⟶ࢆ⏝࠸ࡿࡇ࡜࡛ࠊ⁐᥋ᅛᐃ࡟ࡼ

12㸫 10)LJ&6 ࢥ࣮ࣝࢻ࣐ࢫࡢ⇕ゎᯒ᮲௳)LJ&6 ࢥ࣮ࣝࢻ࣐ࢫࢧ࣏࣮ࢺࡢ ᗘศᕸ)LJ&6 ࢥ࢖ࣝࡢ ᗘศᕸ⇕㔞ࡀ᭱ࡶ኱ࡁ࠸ CS1 ࢩ࢙ࣝࡢ୰ኸ㒊࡛ࡶ ᗘ᭱኱್ࡣ 4.9 K ࡛࠶ࡾࠊ90 ᪥㛫ࡢᨺᑕ⥺࡟ࡼࡿᙳࡣ 6 K ௨ୗ࡜࡞ࡗ࡚࠸ࡿࠋ

㡪࡛ 6.3 K ࡲ࡛ ᗘࡀୖ᪼ࡍࡿࠋ෭༷⟶࠿ࡽ㐲࠸⇕཰⦰࡟㛵ࡋ࡚ࠊኚ఩ศᕸࡼࡾᚓࡽࢀࡓ཰⦰㔞ࢩ࢙ࣝእ࿘୰ኸࡢ ᗘࡣ 6.2 K ࡜࡞ࡗ࡚࠾ࡾࠊࡑ

ࡣࠊᚄ᪉ྥ࡛᭱኱ 4 mmࠊ㛗ᡭ᪉ྥ࡛ 17 mm ࡜ࡢᙳ㡪࡛ࢥ࢖ࣝࡢእᒙࡶ୰ኸࡢ

࡞ࡗࡓࠋPCS ࡢࢥ࢖ࣝ㓄⨨⢭ᗘࡣࠊຍ㏿ჾ☢▼ࡼࡗ࡚࠸ࡿࠋᐇ㝿ࡢ CS1 ࢩ࢙ࣝࡣࠊࢥ࢖ࣝࡢࣇ࣮ࣉ

ࡾࡶపࡃᩘ࣑ࣜ⛬ᗘ࡛࠶ࡿࡢ࡛ࠊ෭༷๓ᚋ࡛⢭ᐦຊ࡟ࡼࡿෆ㒊ᛂຊࢆపῶࡍࡿࡓࡵ࡟ࢩ࢙ࣝࡢ୰

࡞఩⨨ㄪᩚᶵᵓ➼ࢆタࡅࡿᚲせࡣ࡞࠸ࡀࠊࡇࢀࡽ

ኸ㒊ศࡢཌࡳࢆ 120 mm ࡟ቑຍࡋ࡚࠾ࡾࠊࡇࡢィࡢ⇕཰⦰㔞ࢆ⪃៖ࡋࡓタィࡀᚲせ࡜࡞ࡿࠋࡲࡓࠊ

⟬ࣔࢹࣝࡼࡾࡶ᰾Ⓨ⇕ࡣቑຍࡋ᭦࡟ఏᑟ㊥㞳ࡶࢥ࣮ࣝࢻ࣐ࢫࢆᐊ

㛗ࡃ࡞ࡗ࡚࠸ࡿࠋࢥ࢖ࣝࡢ

࡛᏶඲࡟┿✵ᐜჾ࡟ᅛᐃࡋ

ᗘࡀ㧗ࡵ࡟࡞

ᗘୖ᪼ࡀᠱᛕࡉࢀࡿ

ࡓሙྜࠊ㛗ᡭ᪉ྥ 17 mm ࡢ཰⦰㔞ࡣ㠀ᖖ࡟኱ࡁࡓࡵࠊ෭༷⟶ࡢ 4 ⤒㊰࡟ቑຍࡉࡏࠊ⣧࢔࣑ࣝࢽ࢘࡞ᛂຊࢆⓎ⏕ࡉࡏࡿࠋᅇ㌿ᗙ㔠ࡸࡤࡡ➼ࢆ⏝࠸࡚࣒෭༷ྎᗙࢆ㓄⨨ࡍࡿࡇ࡜࡛ࠊFig. 5-12 ࡢᵝ࡟ࢩࢥ࣮ࣝࢻ࣐ࢫࡸࢧ࣏࣮ࢺ࡟㐣๫࡞㈇Ⲵࢆ㏨ࡀࡍ࢙ࣝࡢ⾲㠃 ᗘࢆ 6 K ௨ୗࡲ࡛ᢚ࠼࡚࠸ࡿࠋࡇ࡜ࡀ㔜せ࡛࠶ࡿࠋ
㉸ఏᑟ☢▼ࡢタィ࡟࠾࠸࡚ࠊࢥ࢖ࣝࡢෆ㒊 ᗘࢆṇ☜࡟ぢ✚ࡿࡇ࡜ࡀᴟࡵ࡚㠀ᖖ࡟㔜せ࡛࠶ࡿࡀࠊ」ྜᮦᩱࣔࢹ࡛ࣝࡣ㞴ࡋ࠸ࠋࡑࡇ࡛ࠊCS ࢥ࣮ࣝࢻ࣐ࢫࡢࢥ࢖ࣝ࡟㛵ࡋ࡚ 2 ḟඖ෇⟄ᑐ⛠ࣔࢹࣝ࡟ࡼࡿᕪศἲゎᯒ࡟ࡼࡾホ౯ࡉࢀࡓ[15]ࠋᮏࣔࢹ
ࣝࡣࠊᨺᑕ⥺ࡢࣔࣥࢸ࢝ࣝࣟࢩ࣑࣮ࣗࣞࢩࣙࣥ࡜
㐃ᦠࡉࢀ࡚࠾ࡾࠊ⥺㔞࡟౫Ꮡࡋࡓ᰾Ⓨ⇕㔞ࡸ≀ᛶ್ࡢ⪃៖ࡉࢀ࡚࠸ࡿࠋ
Fig. 5-13 ࡟ COMET Phase-II ࡢᐇ㦂᮲௳㸦㝧Ꮚࣅ࣮࣒㸸㸶GeV, 56 kW㸧࡛ 30 ᪥㛫㐠㌿ࡋࡓᚋࡢ CS1 ࢥ࢖ࣝࡢ ᗘศᕸࢆ♧ࡍࠋFig. 5-13 ࡟࠾࠸࡚ࠊ㧗⣧ᗘ࢔࣑ࣝ෭༷ᯈࡢඛ➃ࡀ 4.5 K ࡟෭ࡸࡉࢀ࡚࠸ࡿࠋࢥ࢖ࣝࡢእഃ࡟ࡣཌࡉ 500 mm ࡢ
A5083 〇ࡢࢧ࣏࣮ࢺࢩ࢙ࣝࡀ㓄⨨ࡉࢀ࡚࠾ࡾࠊ෭
༷⟶ࢆ᝿ᐃࡋࡓ 4.5 K ࡢ෭༷㒊ࡀࢩ࢙ࣝእഃࡢୖ
ὶ࡜ୗὶࡢ 2 ⟠ᡤ࡟タࡅࡽࢀ࡚࠸ࡿࠋ⇕ఏᑟ⋡ࡀຎ໬ࡋ࡚࠸࡞࠸ᐇ㦂㛤ጞ᫬ࡢ CS1 ࢥ࢖ࣝ ᗘࡢ

6. ࡉࡽ࡞ࡿ኱ᙉᗘ໬࡟ྥࡅ࡚
㉸ఏᑟ☢▼ࡣ࣑࣮ࣗ࢜ࣥࣅ࣮࣒ࣛ࢖ࣥ࡟ᛂ⏝ࡉࢀ㸪㧗ရ㉁໬㸪኱ᙉᗘ໬࡟኱ࡁࡃ㈉⊩ࡋ࡚࠸ࡿࡀࠊ࣑࣮ࣗ࢜ࣥ⛥ᔂቯ᥈⣴࡞࡝ࡢࡓࡵ࡟ࡣࠊࡉࡽ
࡞ࡿ኱ᙉᗘ໬ࡀษᮃࡉࢀ࡚࠸ࡿࠋ
኱ᙉᗘ໬ࡢࡓࡵ࡟ࡣࠊࢥ࢖ࣝྵ౵ࡸᵓ㐀య࡞࡝࡟౑ࢃࢀࡿ᭷ᶵᮦᩱ࡞࡝ࡢ☢▼ᮦᩱ࡟࠾࠸࡚ᨺ
ᑕ⥺ᑐ⟇ࡀ୙ྍḞ࡛࠶ࡿࠋ㉸ఏᑟ⥺ᮦ࡟ࡘ࠸࡚
ࡣࠊCOMET ࣃ࢖࢜ࣥᤕ⋓ࢯࣞࣀ࢖ࢻࡢࡼ࠺࡟ཌ
࠸㐽ⶸయࢆ☢▼ෆ㒊࡟ᤄධࡋࠊ෭༷ᯈࢆࢥ࢖ࣝෆ
㒊࡟ᑟධࡍࡿ࡞࡝ᵝࠎ࡞ᕤኵࢆྲྀࡾධࢀࡓ࡜ࡋ
࡚ࡶࠊNbTi ࢆ౑ࡗࡓ㉸ఏᑟ☢▼࡟ࡣ COMET ࢆ㉸࠼ࡿ኱ᙉᗘ㝧Ꮚࣅ࣮࣒ࡢཷࡅධࢀࡸᙉ☢ሙ໬ࡣ㞴ࡋ࠸࡜⪃࠼ࡽࢀࡿࠋ
ࡑࡇ࡛㸪ḟୡ௦ࡢ࣑࣮ࣗ࢜ࣥࣅ࣮࣒ࣛ࢖ࣥ࡟ࡣ㧗 ㉸ఏᑟయ㸦HTS㸧ࢆ౑⏝ࡍࡿࡇ࡜ࡀ᳨ウࡉࢀ
࡚࠾ࡾࠊHTS ࢆ౑ࡗ࡚ᤕ⋓ࢯࣞࣀ࢖ࢻࢆᐇ⌧࡛ࡁࢀࡤࠊ኱ᙉᗘ໬ࡢࡳ࡞ࡽࡎࣃ࢖࢜ࣥᤕ⋓ࢩࢫࢸ࣒ࡢࢥࣥࣃࢡࢺ໬ࡶᮇᚅ࡛ࡁࡿ[16]ࠋHTS ࢥ࢖ࣝࡣNbTi ࡟ẚ࡭࡚㧗࠸ ᗘ㡿ᇦ࡛㐠㌿࡛ࡁࡿࡢ࡛ࠊ

12㸫 11㐠㌿ ᗘࢆ 20 K ⛬ᗘ࡟ࡍࢀࡤ㸪࢔࣑ࣝࡸ㖡࡞࡝ࡢẚ⇕ࡀ 4 K ࡟ẚ࡭୍࡚᱆௨ୖ኱ࡁࡃ࡞ࡿࡓࡵ
᰾Ⓨ⇕࡟ࡼࡿ ᗘୖ᪼ࢆ⦆࿴࡛ࡁࠊࡉࡽ࡟⇕ఏᑟ⋡ࡶᩘ᱆ᨵၿࡍࡿࡢ࡛ࠊ༑ศ࡞ ᗘ࣐࣮ࢪࣥࢆಖࡗ࡚㐠㌿࡛ࡁࡿࠋࡓࡔࡋ㸪࣐࢞ࣥ⥺࡞࡝࡟ࡼࡿ᭷
ᶵᮦᩱࡢຎ໬ࡣ㑊ࡅࡽࢀ࡞࠸ࡢ࡛㸪⥺ᮦࢆࢭ࣑ࣛ
ࢵࢡࢫ࡛ࢥ࣮ࢸ࢕ࣥࢢࡍࡿ࡞࡝↓ᶵ⤯⦕ࢆ౑ࡗࡓᕳࡁ⥺ᢏ⾡ࡢ㛤Ⓨࡀ㐍ࡵࡽࢀ࡚࠾ࡾࠊ኱ᙉᗘ໬
ࡢࡳ࡞ࡽࡎࠊ᪤Ꮡࣅ࣮࣒ࣛ࢖ࣥࡢᖖఏᑟࢯࣞࣀ࢖
ࢻࡢ⨨ࡁ᥮࠼࡟ࡶᮇᚅࡉࢀ࡚࠸ࡿࠋᮏ❶࡛ࡣࠊࡇࢀࡽࡢ㛤Ⓨ≧ἣ࡟ࡘ࠸࡚⤂௓ࡍࡿࠋࡵࡓྛ㉸ఏᑟ⥺ᮦࡢ⮫⏺㟁ὶᐦᗘࡢ☢ሙ≉ᛶࢆ♧ࡍࠋೃ⿵࡜࡞ࡿࡢࡣࠊNb3Sn ࡸ Nb3Al ࡜࠸ࡗࡓA15 ᆺ㉸ఏᑟయ࡜࢖ࢵࢺ࣒ࣜ࢘⣔ཬࡧࣅࢫ࣐ࢫ⣔ࡢ HTS ࡛࠶ࡿࠋᨺᑕ⥺ࡢၥ㢟ࡶ㠀ᖖ࡟㔜せ࡛࠶ࡾࠊ⾪✺Ⅼ㏆ഐ࡟㓄⨨ࡉࢀࡿ☢▼ࡸࣃ࢖࢜ࣥᤕ⋓ࢯࣞࣀ࢖ࢻ➼ࡢ㧗㍤ᗘ 2 ḟࣅ࣮࣒ࣛ࢖ࣥ⏝☢▼࡟ࡶ㠀ᖖ࡟㧗࠸ᨺᑕ⥺⪏ᛶࡀせồࡉࢀࡿࠋFCC ࡢ┠ᶆ࣑ࣝࣀࢩࢸ
࢕ࡣ㧗㍤ᗘ LHC ࡼࡾ୍᱆㧗࠸ࡓࡵࠊ⾪✺Ⅼ௜㏆ࡢᶵჾࡢ⥲⥺㔞ࡣᩘⓒ MGy ࡟㐩ࡍࡿ࡜ண᝿ࡉ
ࢀ [19]ࠊMuon Collider ࡢࣃ࢖࢜ࣥᤕ⋓ࢯࣞࣀ࢖

6.1. ᑗ᮶ࡢ⪏ᨺᑕ⥺㉸ఏᑟ☢▼ཎᏊ᰾࣭⣲⢏Ꮚ≀⌮ᏛࡢⓎᒎࡣࠊ⢏Ꮚຍ㏿ჾࡸ᳨ฟ⿦⨨ࡢ㧗ᗘ໬࡜ඹ࡟Ṍࢇ࡛࠾ࡾࠊࡑࡢ୰࡛ࡶ
☢▼ᢏ⾡ࡢⓎᒎࡣḞ࠿ࡍࡇ࡜ࡀ࡛ࡁ࡞࠸ࡶࡢࡢ
୍ࡘ࡛࠶ࡿࠋ⌧ᅾ CERN ࡼࡾᥦ᱌ࡉࢀ࡚࠸ࡿ࿘
㛗 100 km ࡟ࡶ࡞ࡿ㉸኱ᆺࡢ෇ᙧ⾪✺ᆺຍ㏿ჾࡢ ᘓ タ ィ ⏬ Future Circular Collider (FCC,
https://fcc.web.cern.ch ) ࡛ࡣࠊ✲ᴟࡢ┠ᶆ࡛࠶ࡿ࢚ࢿࣝࢠ࣮100 TeV ࡢ㝧Ꮚࣅ࣮࣒ࢆࢥࣥࢺ࣮ࣟࣝ
ࡍࡿࡓࡵ࡟ 20 T ⣭ࡢ㧗☢ሙ☢▼ࡀせồࡉࢀ࡚࠸ࡿ[17]ࠋ᭦࡟ࡑࡢඛࡢ Muon Collider ィ⏬࡛ࡣࠊ
20 T ࡢࣃ࢖࢜ࣥᤕ⋓ࢯࣞࣀ࢖ࢻࡸ 40~60 T ࡢ࣑࣮ࣗࣥࣅ࣮࣒෭༷⏝ࢯࣞࣀ࢖ࢻ࡞࡝ࠊ㠀ᖖ࡟ᣮᡓⓗ࡞ᛶ⬟ࢆせồࡋ࡚࠸ࡿࡶࡢࡀ࠶ࡿ[18]ࠋࡇࡢᵝ࡞ 㧗☢ ሙ࡛ࡣ ࠊ⌧ ᅾ୍⯡ ⓗ࡟ ౑⏝ࡉ ࢀ࡚ ࠸ࡿ
NbTi ࡣࠊ㉸ఏᑟ≧ែࢆ⥔ᣢ࡛࠸࡞࠸ࡓࡵ᪂ࡓ࡞
㉸ఏᑟ⥺ᮦࢆ⏝࠸ࡓ☢▼ࡢ㛤Ⓨࡀᚲせ࡟࡞ࡿࠋFig. 6-1 ࡟⡿ᅜࡢ National High Magnetic Field
Laboratory㸦https://nationalmaglab.org/㸧ࡀࡲ࡜ࢻࡣࡉࡽ࡟ཝࡋ࠸ᨺᑕ⥺⎔ቃୗ࡛㐠㌿ࡉࢀࡿࡇ࡜ࡀண᝿ࡉࢀࡿࠋ
J-PARC ࡢᑗ᮶ィ⏬࡟࠾࠸࡚ࠊ≀㉁࣭⏕࿨⛉Ꮫᐇ㦂᪋タ㸦MLF㸧࡛ࡣ➨ 2 ࢱ࣮ࢤࢵࢺࢫࢸ࣮ࢩࣙ
ࣥ㸦TS2㸧ࡢᘓタࡀᥦ᱌ࡉࢀ࡚࠾ࡾࠊࡑࡢ࣑࣮ࣗ
࢜ࣥࣅ࣮࣒ࣛ࢖ࣥ⏝ࡢࣃ࢖࢜ࣥᤕ⋓ࢯࣞࣀ࢖ࢻ
㸦TS2-PCS㸧ࡢ᳨ウࡀ⾜ࢃࢀ࡚࠸ࡿ[20]ࠋTS2-PCSࡣࠊ࣑࣮ࣗ࢜ࣥࣅ࣮࣒཰㔞ࢆ᭱኱໬ࡍࡿࡓࡵࠊ3
GeVࠊ1 MW ࡢ㝧Ꮚࣅ࣮࣒ࡀ↷ᑕࡉࢀࡿ 2 ḟ⢏Ꮚ⏕ᡂᶆⓗࡢ㏆ഐ࡟㓄⨨ࡉࢀࡿࡓࡵࠊ྾཰⥺㔞ࡣ
10 ᖺ㛫࡛ 130 MGy ࡟㐩ࡋࠊ᰾ຍ⇕ࡣ㐽ⶸᵓ㐀࡟ࡶࡼࡿࡀ 650 W ࡜ぢ✚ࡶࡽࢀ࡚࠸ࡿࠋࡇࡢᵝ࡞኱ࡁ࡞ධ⇕࡟ᑐࡍࡿ෭༷ࡣ⡆༢࡛ࡣ࡞࠸ࡀࠊHTS ⥺ᮦࡣ෭༷࡟㛵ࡋ࡚ࡶ㠀ᖖ࡟᭷฼࡟ാࡃࠋHTS ࡢ⮫⏺ ᗘࡣ⣙ 90 K ࡜㧗࠸ࡓࡵࠊNbTi ࡟ẚ࡭࡚ࢥ࢖ࣝࡀ㉸ఏᑟᛶࢆ⥔ᣢ࡛ࡁࡿᗘ⿱ᗘࡀ᱁ẁ࡟኱ࡁ࠸ࠋࡲࡓࠊᨺᑕ⥺ࡢᙳ㡪ࢆ⪃៖ࡋࡓ
㍍㔞໬ࡢࡓࡵ࡟ࠊఏᑟ෭༷᪉ᘧ࡟ࡼࡿ෭༷࡟࡞ࡿ
ࡀࠊ࢔࣑ࣝࢽ࣒࢘ࡸ㖡ࡢ⇕ఏᑟ⋡ࡢ㠀ᖖⰋ࠸ ᗘ㡿ᇦ 20 K ࡛ࢥ࢖ࣝࢆ㐠㌿ࡍࡿࡇ࡜ࡀ࡛ࡁࠊຠ⋡ࡢⰋ࠸㐠㌿࡜෭፹ࡢᨺᑕ໬ࡶ᭱ᑠ໬࡛ࡁࡿࠋ
ᡃࠎࡣࠊTS2-PCS ࡢᐇ⌧࡟୺㍈ࢆ⨨ࡁࠊHTS⥺ᮦ࡛࠶ࡿ REBCO (rare-earth barium copperoxide)࡟╔┠ࡋ࡚ࠊᇶ♏ⓗ࡞◊✲㛤Ⓨࢆ⾜ࡗ࡚࠸ࡿࠋᮏ❶࡛ࡣࠊREBCO ⥺ᮦࡢ↷ᑕຠᯝ࡜↓ᶵ⤯⦕
REBCO ࢥ࢖ࣝ◊✲㛤Ⓨ࡟ࡘ࠸࡚⤂௓ࡍࡿࠋ
6.2. REBCO ⥺ᮦࡢ↷ᑕຠᯝᮏ✏࡛ࡣࠊᩥ⊩[21]ࢆᇶ࡟ REBCO ⥺ᮦ⏣ࡍࡿ࣐࢞ࣥ⥺↷ᑕ࡜୰ᛶᏊ↷ᑕ࡟㛵ࡋ࡚⤂௓ࡍࡿࠋ)LJ ྛ⥺ᮦࡢ⮫⏺㟁ὶᐦᗘࡢ☢ሙ≉ᛶ

12㸫 12

6.2.1. ⫼ᬒ࣭┠ⓗࣉࣝࡢ෗┿ࢆ♧ࡍࠋࢧࣥࣉࣝ࡟ࡣࠊᖹᆒ⥺㔞⋡ 8.4

PCS ࡢࢥ࢖ࣝࡣᵝࠎ࡞ᨺᑕ㉸ఏᑟᮦᩱࡢศ㔝kGy/h ࡛ 14.9 MGy ࡲ࡛࣐࢞ࣥ⥺ࡀ↷ᑕࡉࢀࡓࠋ

࡛ࡣࠊ᪂ࡋ࠸ேᕤࣆࣥࢽࣥࢢࢭࣥࢱ࣮ࡢᑟධ࡟ࡼ

1 ࡘࢧࣥࣉࣝࢭࢵࢺࡣࠊ
᭦࡟ᖹᆒ⥺㔞⋡ 5.7 kGy/hࡿ㉸ఏᑟ≉ᛶᨵၿࢆㄪ࡭ࡿࡓࡵ࡟ࠊప↷ᑕ⥺㔞࡛

࡛ 27.4 MGy ࡲ࡛↷ᑕࡉࢀࡓࠋ↷ᑕࡉࢀࡓࢧࣥࣉ

ࡉࡲࡊࡲ࡞⢏Ꮚࢆ⏝࠸ࡓ↷ᑕࡀ⾜ࢃࢀࡓ [22-ࣝࡣࠊIC24]ࠋࡉࡽ࡟ࠊ࢖ࢵࢺ࣒ࣜ࢘ ⣔(YBCO) ㉸ఏᑟయ㡪ࢆ᭱ᑠ㝈࡟ᢚ࠼ࡿࡓࡵ࡟┿✵୰࡛ಖᏑࡉࢀࡓࠋ

࡟ᑐࡍࡿ࣐࢞ࣥ⥺↷ᑕࡢᙳ㡪࡟㛵ࡍࡿ࠸ࡃࡘ࠿
ࡢ◊✲άືࡀ⾜ࢃࢀ࡚࠸ࡿ [25-27]ࠋ ࣐࢞ࣥ⥺↷ᐃ࡟ࡼࡿホ౯ヨ㦂ࡲ࡛ࠊ↷ᑕ௨እࡢᙳ

A. ࣐࢞ࣥ⥺↷ᑕ࡟ࡼࡿ⮫⏺㟁ὶࡢᙳ㡪ᗘ࣐࢞ࣥ⥺↷ᑕ࡟ࡼࡿ㉸ఏᑟ≉ᛶ࡬ࡢᙳ㡪ࢆホ㸦TC 㸧ࡢ኱ᖜ࡞పୗࡣほᐹࡉࢀ࡞࠿ࡗࡓࡀࠊ0.4

౯ࡍࡿࡓࡵ࡟ࠊ↷ᑕࡉࢀࡓ REBCO ࢧࣥࣉࣝࡢ IC

MGy ࢆ㉸࠼ࡿ⥺㔞࡛⮫⏺㟁ὶ (IC) ࡢపୗࡀሗ

ࡣࠊᾮయ❅⣲ࢆ⏝࠸࡚እ㒊☢ሙࡀ࡞࠸≧ែ࡛ ᐃ࿌ࡉࢀ࡚࠸ࡿࠋࡑࡇ࡛ࠊᡃࠎࡣᐇ⏝⥺ᮦ࡟ᑐࡍࡿ

ࡉࢀࡓࠋFig. 6-3 ࡟ ICᐃ⏝἞ලࡢᵓᡂࢆ♧ࡍࠋ↷ᑕຠᯝࡢ⌮ゎࢆ῝ࡵࡿࡓࡵ࡟ࠊᕷ㈍ࡢ REBCOࢸ࣮ࣉࡣ↓㓟⣲㖡ࡢ㟁ᴟᯈᣳࡲࢀᶵᲔⓗ࡟἞ලࢸ࣮ࣉ⥺ᮦࡢ IC ࡟ᑐࡍࡿ࣐࢞ࣥ⥺↷ᑕࡢᙳ㡪ࢆ࡟ᅛᐃࡉࢀࡿࠋ⤌ࡳ❧࡚ࡽࢀࡓ἞ලࡣᾮయ❅⣲࡟ᑕ࡟ࡼࡗ࡚ YBCO ࣂࣝࢡࢧࣥࣉࣝࡢ⮫⏺

ㄪ࡭ࡿࡇ࡜࡟ࡋࡓࠋ
ேᕤ⾨ᫍ࡟ᦚ㍕ࡍࡿほ⿦⨨ࡸ᰾⼥ྜ⅔࡬ࡢᛂ⏝ࢆ┠ᣦࡋࡓ HTS ࡟ᑐࡍࡿ୰ᛶᏊ↷ᑕࡢ◊✲ࡶ⾜ࢃࢀ࡚࠸ࡿ [28-30]ࠋMLF-TS2 ࡢタィ࡟࠾࠸࡚ࠊᩥ⊩[28]ࢆཧ⪃࡟㧗㏿୰ᛶᏊ↷ᑕ࡟ࡼࡿ ICࡢຎ໬ࢆ⿣ࡅࡿࡓࡵ࡟ TS2-PCS ࡬ࡢ୰ᛶᏊࣇࣝ
࢚ࣥࢫࡢୖ㝈ࢆ 1×1023 n/m2 ࡟タᐃࡋࡓࠋࡑࡇ
࡛ࠊᡃࠎࡣ TS2-PCS 㛤Ⓨࡢࡓࡵࡢࢹ࣮ࢱࢆྲྀᚓ
ࡍࡿࡓࡵ 1021㹼1023 n/m2 ࡢ୰ᛶᏊࣇ࢚ࣝࣥࢫࡢ
⠊ᅖ࡛ REBCO ࢸ࣮ࣉ⥺ᮦ࡬ࡢ୰ᛶᏊ↷ᑕࢆ⾜ࡗࡓࠋ
6.2.2. ࣐࢞ࣥ⥺↷ᑕ࣐࢞ࣥ⥺↷ᑕࡣࠊ㔞Ꮚ⛉Ꮫᢏ⾡◊✲㛤Ⓨᶵᵓ㧗ᓮ㔞Ꮚᛂ⏝◊✲ᡤࡢࢥࣂࣝࢺ 60 ↷ᑕ᪋タ࡛⾜)LJ ホ౯⏝ ,&ᐃ⏝἞ලࡢᵓᡂ

ࢃࢀࡓ[31]ࠋTS2-PCS ࡢ྾཰⥺㔞ࡢ᥎ᐃ್ࡣ 130
MGy ࡛࠶ࡿࡀࠊ↷ᑕ᫬㛫ࡀ㛗ᮇ࡟ཬࡪࡓࡵ᭱ึ
ࡢ┠ᶆ⥺㔞ࡣ 20 MGy ࡟タᐃࡉࢀࡓࠋ↷ᑕ⏝ࡢࢧࣥࣉࣝࡣࠊᖜ 4 mmࠊཌࡉ 0.1 mmࠊ㛗ࡉ 200 mm
ࡢேཱྀࣆࣥධࡾ GdBCO ࢸ࣮ࣉ㸦SCS4050-AP㸧࡛࠶ࡾࠊ࢞ࣛࢫ〇࢔ࣥࣉࣝ࡟┿✵࡛ᐦ㛢ࡉࢀࡓࠋ
Fig. 6-2 ࡟࢞ࣛࢫ࢔ࣥࣉࣝ࡟┿✵ᑒධࡉࢀࡓࢧࣥ

)LJ ࣐࢞ࣥ⥺↷ᑕ࡟ࡼࡿ ,& ࡢຎ໬⋡

)LJ ┿✵ᑒධࡉࢀࡓ↷ᑕ⏝ࢧࣥࣉࣝ12㸫 13ࡺࡗࡃࡾỿࡵࡽࢀࠊ༑ศ࡟෭༷ࡋࡓᚋ࡟㏻㟁ࡉࢀࡓࠋ㟁ᅽࡣࢸ࣮ࣉ⾲㠃࡟᥋ゐࡋ࡚࠸ࡿ 70 mm 㞳
ࢀࡓ 2 ᮏࡢࡤࡡᘧࡢࢥࣥࢱࢡࢺࣉ࣮ࣟࣈࡢ୧➃࡛ᐃࡉࢀࡿࠋᮏ ᐃ࡛ࡣࠊ㟁ὶࢆᤲᘬࡋ᢬ᢠᡂศ
࡟ࡼࡿ㟁ᅽࡀ 1 PV/cm ࡟㐩ࡋࡓ㟁ὶ್ࢆ IC ࡜ᐃ⩏ࡋ࡚࠸ࡿࠋFig. 6-4 ࡟⥺㔞࡜↷ᑕࡉࢀࡓࢧࣥࣉࣝࡢ IC ࢆᮍ↷ᑕࡢ IC0 ࡛㝖ࡋࡓຎ໬⋡ࡢ㛵ಀࢆ♧ࡍࠋ⤖ᯝ࡜ࡋ࡚ࠊ27.4 MGy ࡲ࡛ࡢ࣐࢞ࣥ⥺↷ᑕ࡟ࡼࡿ IC ࡢຎ໬ࡣほ ࡉࢀ࡞࠿ࡗࡓࠋ
6.2.3. ୰ᛶᏊ↷ᑕ୰ᛶᏊ⥺↷ᑕࡣࠊᮾ໭኱Ꮫ㔠ᒓᮦᩱ◊✲ᡤࡢඹྠ฼⏝◊✲ࣉࣟࢢ࣒ࣛࢆ฼⏝ࡋ࡚ࠊ㔞Ꮚ࢚ࢿࣝࢠ
࣮ᮦᩱ⛉Ꮫᅜ㝿◊✲ࢭࣥࢱ࣮㸦IRCNMS㸧࡛⾜ࢃࢀ࡚࠸ࡿࠋIRCNMS ࡛ࢧࣥࣉࣝࡀ⿦ሸࡉࢀࡓ࢝
ࣉࢭࣝࡣࠊ࣋ࣝࢠ࣮࣭ࣔࣝ◊✲ᡤ࡟㏦ࡽࢀࠊᐇ㦂ཎᏊ⅔ (BR2) ෆ࡛ 100Υᮍ‶ࡢᛶᏊࣇ࢚ࣝࣥࢫ

ᗘ࡛┠ᶆࡢ୰

(1021㹼1023 n/m2ࠊEn> 0.1 MeV)ࡲ࡛୰ᛶᏊࢆ↷ᑕࡉࢀࡿࠋ ↷ᑕࡉࢀࡓ࢟ࣕࣉࢭ
ࣝࡣࠊ㍺㏦ྍ⬟࡞⥺㔞࡟㐩ࡍࡿࡲ࡛ BR2 ࡛෭༷ࡉࢀᚋ࡟㏉㑏ࡉࢀࡿࠋࡑࡢᚋࢧࣥࣉࣝࡣ IRCNMS
ࡢᨺᑕ⥺⟶⌮༊ᇦ࡛ཝᐦ࡟⟶⌮ࡉࢀࡿࠋA. ㉸ఏᑟ≉ᛶホ౯⿦⨨↷ᑕࡉࢀࡓ REBCO ࢧࣥࣉࣝࡢ㉸ఏᑟ≉ᛶࡣࠊ

)LJ97, ࡜ࢧࣥࣉࣝ࣍ࣝࢲ࣮ࡢᵓ㐀

IRCNMS ࡢ࣍ࢵࢺᐇ㦂ᐊෆ࡟タ⨨ࡉࢀ࡚࠸ࡿྍ

ࡣࢸ࣮ࣉ⾲㠃࡟᥋ゐࡉࢀࡿࣉ࣮ࣟࣈ࡛ ᐃࡉࢀࠊᗘ࢖ࣥࢧ࣮ࢺ (VTI) ࡜ 15.5 T ㉸ఏᑟ☢▼ࣉ࣮ࣟࣈ㛫ࡢ㊥㞳ࡣ 1.4 cm ࡛࠶ࡿࠋSD ࢱ࢖ࣉࡢ࠿ࡽ࡞ࡿホ౯⿦⨨ࢆ฼⏝ࡋ࡚ㄪ࡭ࡽࢀ࡚࠸ࡿࠋホ

Cernox® ᗘィ㸦CX-SD㸧ࡣࠊ㟁ᅽࣉ࣮ࣟࣈࡢ㛫౯⿦⨨ࡣࠊࡑࢀࡒࢀࡢࢧࣥࣉࣝ࡟㐺ࡋࡓ࣍ࣝࢲ࣮

࡛ REBCO ࢧࣥࣉࣝ࡟┤᥋᥋ゐࡍࡿࡼ࠺࡟ྲྀࡾ௜

ࢆ஺᥮ࡍࡿࡇ࡜࡛ࠊࡉࡲࡊࡲ࡞㉸ఏᑟ⥺ᮦ࡜እ㒊ࡅࡽࢀ࡚࠾ࡾࠊ᭦࡟ CU ࢱ࢖ࣉࡢ Cernox® ᗘィ☢ሙ㓄ྥ࡟ᑐᛂࡋ࡚࠸ࡿࠋ㸦CX-CU㸧ࡀࢧࣥࣉࣝ࣍ࣝࢲ࣮㟁ᴟࡢ୧➃࡟ࡑࢀኚ

Fig. 6-5 ࡟ VTI ࡜ REBCO ࢸ࣮ࣉ⏝ࢧࣥࣉࣝ࣍

ࡒࢀྲྀࡾ௜ࡅࡽࢀ࡚࠸ࡿࠋࢧࣥࣉࣝ࣍ࣝࢲ࣮ࡢ

ࣝࢲ࣮ࡢᵓ㐀ࢆ♧ࡍࠋ෭፹ࡢᨺᑕ໬ࢆ㜵ࡄࡓࡵᗘࡣࠊ࢔࣑ࣝࢽ࣒࢘෭༷ࣟࢵࢻࡢඛ➃࡟࠶ࡿࣄ࣮

࡟ࠊࢧࣥࣉࣝࡢ෭༷ࡣ 2 ྎࡢ Gifford-McMahonࢱ࣮࡟ࡼࡗ࡚ 5㹼77 K ࡢ⠊ᅖ࡛s0.1 K ࡢᏳᐃ(GM) ෭෾ᶵ࡟ࡼࡿ෭፹ࣇ࣮ࣜࡢఏᑟ෭༷᪉ᘧࡀ

ᛶ࡛ไᚚࡉࢀࡿࠋ
ᮏࢭࢵࢺ࢔ࢵࣉ࡟ࡣࢧࣥࣉࣝ࣍ࣝࢲ࣮㟁ᴟ㛫᥇⏝ࡉࢀ࡚࠸ࡿࠋࢧࣥࣉࣝ࣍ࣝࢲ࣮ࡣࠊGM ෭෾ᶵ࣊ࢵࢻ࠿ࡽ↓㓟⣲㖡㸦OFC㸧ࡢ෭༷ࢫࢸ࣮ࢪࠊࡢ ᗘᕪࡀ࠶ࡾࠊࢧࣥࣉࣝ

ᗘࡢ୙ᐃᛶࡢ୍ࡘ࡟

㧗⣧ᗘ࢔࣑ࣝࢽ࣒࢘෭༷ࣟࢵࢻࠊOFC 〇ࡢࣂࢫࣂ࡞ࡗ࡚࠸ࡿࠋ࢔࣑ࣝࢽ࣒࢘෭༷ࣟࢵࢻ࡜ࣂࢫࣂ࣮

࣮ࢆ௓ࡋ࡚෭༷ࡉࢀࡿࠋFig.6-5 㸦B㸧࡟♧ࡉࢀ࡚ࡢ㛫࡟ࡣ㟁Ẽ⤯⦕ࡢࡓࡵ࡟࣏ࣜ࢖࣑ࢻࣇ࢕࣒ࣝ

࠸ࡿࢧࣥࣉࣝ࣍ࣝࢲ࣮ࡢሙྜࠊREBCO ࡢ c ㍈ᣳࢇ࡛࠸ࡿࡀࠊࡑࢀࡒࢀࡢ᥋ゐ᮲௳࡟㉳ᅉࡋࡓ⇕ࡀእ㒊☢ሙ࡜ᖹ⾜࡟タᐃࡉࢀࡿࠋࢧࣥࣉࣝࡢ㟁ᅽ᢬ᢠࡀ␗࡞ࡿࡇ࡜࡛⏕ࡌ࡚࠸ࡿ࡜᥎ ࡋ࡚࠸ࡿࠋ
ࡑࡇ࡛ࠊࢧࣥࣉࣝ ᗘࡢ୰ኸ್ࡣࠊ┤᥋᥋ࡋ࡚࠸

12㸫 14ࡿ CX-SD ࢭࣥࢧ࣮࡛ồࡵࠊ㟁ᅽ ᐃ༊㛫ࡢ ᗘ໙㓄࡟ࡼࡿ୙ṇ☜ࡉࡣࠊ୧㟁ᴟࡢ CX-CU ࢭࣥࢧ࣮ࡢ ᐃࢹ࣮ࢱ࠿ࡽ᥎ᐃࡋ࡚࠸ࡿࠋ
ࢧࣥࣉࣝ ᗘࡢ୙ᐃᛶࡢࡶ࠺㸯ࡘࡢせᅉࡣࠊ㟁ὶ㍺㏦࡟ࡼࡿ᢬ᢠⓎ⇕࡟ࡼࡿ ᗘୖ࡛᪼࠶ࡿࠋᨺ
ᑕ໬ࡋࡓࢧࣥࣉࣝ࠿ࡽࡢ⿕ࡤࡃࢆ᭱ᑠ㝈࡟ᢚ࠼ࡿࡓࡵ࡟ࠊ࣎ࣝࢺᅛᐃ࡟ࡼࡿ⡆༢࡛㎿㏿࡞࣐࢘ࣥࢺ᪉ἲࡀ᥇⏝ࡉࢀ࡚࠾ࡾࠊࡇࡢ᪉ἲࡣ୍⯡ⓗ࡞ࡣࢇࡔ᥋⥆ࡼࡾࡶ᥋ゐ᢬ᢠࡀ㧗ࡃ࡞ࡿࠋࢧࣥࣉࣝ
ᗘࡣ㟁ὶᤲᘬ୰ୖ᪼ࡋ࡚࠸ࡃࡀࠊIC ࡟฿㐩ࡋࡓ᫬࡟ࡕࡻ࠺࡝┠ᶆ

ᗘࡢ±1 K ࡢ⠊ᅖ࡟࡞ࡿᵝ࡟༳ຍ๓ࡢ࣮࣋ࢫ

ᗘࢆୗࡆࡿࡇ࡜࡛ㄪᩚࡋ࡚࠸

)LJ ㉸ఏᑟ㌿⛣

ᗘࡢ

ᐃ⤖ᯝ

ࡿࠋ౛࡜ࡋ࡚ࠊFig. 6-6 ࡟㟁ὶᤲᘬ᫬ࡢ㟁ᅽ࡜ࢧᐃࡉࢀࡓࠋFig. 6-7 ࡟ SCS4050-AP ࢧࣥࣉࣝࡢࣥࣉࣝ ᗘࢆ♧ࡍࠋ┠ᶆ ᗘ 20 K ௜㏆ࡢሙྜࠊእ㒊☢ሙ↓ࡋ࡛ࡢ ᐃ⤖ᯝࢆ♧ࡍࠋࢧࣥࣉࣝࡢ᢬

እ㒊☢ሙ 5 T ࡢሙྜࠊIC ࡣ 207A ࡜࡞ࡾࠊࡑࡢ᫬

ᢠࡣࠊ0.1 A ࡢ㟁ὶ౪⤥࡟ࡼࡾᚓࡽࢀࡿࣉ࣮ࣟࣈ

ᗘୖ᪼ࡣ 0.98 K ࡛࠶ࡗࡓࠋ༳ຍ๓ࡢ࣮࣋ࢫ

㛫ࡢ㟁ᅽ࠿ࡽᑟฟࡋ࡚࠸ࡿࠋ⅊Ⰽ୕ゅࡢ࣐࣮࣮࢝

ᗘࢆ 19 K ࡟ไᚚࡍࡿࡇ࡜࡛ࠊIC ࡛ 20 K ࡟࡞ࡣᮍ↷ᑕࡢࢧࣥࣉࣝࡢ≀࡛࠶ࡾࠊ90 K ௜㏆࡛㉸ఏࡢࡿᵝ࡟ㄪᩚࡋ࡚࠸ࡿࠋ
௒ᅇࡢ୍㐃ࡢᑟ㌿⛣࡟ࡼࡿ᢬ᢠࡢᾘኻࡀぢ࠼ࡿࠋ㉥୸ࡣ୰ᛶᏊ

ᐃ࡛୧᪉せ⣲ࢆྵࡴ IC ࡢᗘࣇ࢚ࣝࣥࢫ 8.23×1021 n/m2 ࡢ⤖ᯝࢆ♧ࡋ࡚࠾ᐃࡣࠊᮍ↷ᑕࡢࢧࣥ

ࡾࠊ⣙ 10 K ࡢ㌿⛣ ᗘࡢపୗࡀほ ࡉࢀ࡚࠸ࡿࠋ

ࣉࣝࢆ⏝࠸ࡓ ᗘ 20 Kࠊእ㒊☢ሙ 2 TࠊIC 419 A

4.11×1022 ࠾ࡼࡧ 7.92×1022 n/m2 ࡢࢹ࣮ࢱ࡛

࡛࠶ࡾࠊㄗᕪࡣ±4.1 K ࡜ぢ✚ࡽࢀ࡚࠸ࡿࠋ⤖ㄽࡣࠊ ᗘࡀୗࡀࡿ࡟ࡘࢀ࡚᢬ᢠࡀ༢ㄪ࡟ῶᑡࡋ࠾

࡜ࡋ࡚ࠊᮏࢭࢵࢺ࢔ࢵࣉ࡛ࡣ㍺㏦㟁ὶࡀ㧗࠸࡯࡝ࡾࠊࢧࣥࣉࣝࡢ㉸ఏᑟᛶࡀᾘኻࡋ࡚࠸ࡿࡇ࡜ࢆ♧࡟ࡼࡿㄗᕪࡀ᭱኱࡜࡞ࡗࡓᗘ ᐃࡢㄗᕪࡀ኱ࡁࡃ࡞ࡿࠋ

ࡋ࡚ࡿࠋᩥ⊩[29]࡟ࡼࡿ࡜ࠊప࢚ࢿࣝࢠ࣮୰ᛶᏊ
ᢚไࡢࡓࡵ࡟ࢩ࣮ࣝࢻࡉࢀࡓ SCS4050-AP ࡢ TC

B. ㉸ఏᑟ㌿⛣ ᗘࡢ୰ᛶᏊ↷ᑕຠᯝࡢຎ໬ࡣࠊ6×1021 n/m2 ࡛ࡣほ ࡉࢀࡲࡏࢇ࡛ࡋ

↷ᑕࡉࢀࡓ REBCO ࢧࣥࣉࣝࡢ㉸ఏᑟ㌿⛣ ᗘࡓࠋࢩ࣮ࣝࢻࡉࢀ࡚࠸࡞࠸ SCS4050-AP ࡢ TC ࡣࠊ

ࡣࠊIRCNMS ࡢ㉸ఏᑟ≉ᛶホ౯⿦⨨ࢆ౑⏝ࡋ࡚ࠊእ㒊☢ሙ࡞ࡋ࡛ 6×1021 n/m2 ࡛⣙ 5 K పୗࡍࡿࠋ
ࡇࢀࡽࡢࢹ࣮ࢱࡣࠊᡃࠎࡢ

ᐃ⤖ᯝ࡜㢮ఝࡋ࡚࠾

ࡾࠊ୰ᛶᏊ↷ᑕ࡟ࡼࡿ㉸ఏᑟ≉ᛶࡢຎ໬࡟ᑐࡋ
࡚ࠊప࢚ࢿࣝࢠ࣮୰ᛶᏊࡢᐤ୚ࡀ኱ࡁ࡞ࡇ࡜ࢆ♧၀ࡋ࡚࠸ࡿࠋ

C. ⮫⏺㟁ὶࡢ୰ᛶᏊ↷ᑕຠᯝ⣙ 10 K ࡢ㉸ఏᑟ㌿⛣ ᗘࡢపୗࡀほ ࡉࢀࡓ୰ᛶᏊࣇ࢚ࣝࣥࢫ 8.23×1021 n/m2 ࡢࢧࣥࣉࣝࡢ
IC-B ᭤⥺ࡀࠊ ᗘ 20ࠥ77 Kࠊ☢ሙ 0ࠥ15 T ࡢ⠊ᅖ࡛ ᐃࡉࢀࡓࠋᮏ ᐃ࡟࠾࠸࡚ࠊ㟁ᅽࢱࢵࣉ㛫ࡢ㊥㞳ࡣ 1.4 cm ࡛࠶ࡾࠊ1 PV/cm ࡢ㟁ᅽ࡟ᑐᛂࡍࡿ㟁ὶ್ࢆ IC ࡜ᐃ⩏ࡋ࡚࠸ࡿࠋFig. 6-8 ࡟እ㒊
)LJ 㟁ὶᤲᘬ᫬ࡢ ᗘୖ᪼☢ሙࡢྥࡁࡀ REBCO ࡢ c ㍈ (B//c) ࡟ᖹ⾜࡛ࡢ12㸫 15)LJ,& ຎ໬⋡࡜ ᐃ ᗘࡢ㛵ಀ

)LJ,&% ᭤⥺ࡢ ᐃ⤖ᯝ20ࠊ40ࠊ50ࠊཬࡧ 77 K ࡢᗘ࡟ᑐࡍࡿ IC-B ᭤࠸ࡿࠋࡲࡓࠊ㧗 ഃ࡛ຎ໬⋡ࡀప࠸ཎᅉࡣࠊ㉸ఏ⥺ࢆ♧ࡍࠋࡑࢀࡒࢀࡢ ᗘ࡛ࠊ⅊Ⰽࡢ࣐࣮࣮࢝ࡣᑟ㌿⛣ ᗘࡢపୗ࡟㛵ಀࡋ࡚࠸ࡿ࡜ᛮࢃࢀࡿࠋ௒

ᮍ↷ᑕࡢࢧࣥࣉࣝࡢ ᐃ್ࠊⰍ௜ࡁࡢ࣐࣮࣮࢝ࡣ

ᚋࠊ୰ᛶᏊ↷ᑕ࡟ࡼࡿ IC ࡢຎ໬࣓࢝ࢽࢬ࣒ࢆ⌮ゎ୰ᛶᏊࣇ࢚ࣝࣥࢫ 8.23×1021 n/m2 ࡲ࡛↷ᑕࡉࢀࡍࡿࡓࡵ࡟ࡣࠊ⤖ᬗᵓ㐀ࡢゎᯒࡶᚲせ࡛࠶ࡿࠋࡓࢧࣥࣉࣝࡢ⤖ᯝࢆ♧ࡋ࡚࠸ࡿࠋᩥ⊩[32]ࡢ㛵ᩘ࡛ᐃࢹ࣮ࢱࢆࣇ࢕ࢵࢺࡋࡓ㏆ఝ᭤⥺ࡣࠊ ᐃࢹ

6.3. ↓ᶵ⤯⦕ࢥ࢖ࣝࡢ㛤Ⓨ࣮ࢱ㛫ࢆ⿵᏶ࡍࡿࡓࡵ࡟Ⅼ⥺࡛ᥥ࠿ࢀ࠸ࡿࠋ୰ᛶ

୍⯡ⓗ࡞㉸ఏᑟ☢▼ࡢ㟁Ẽ⤯⦕࡟⏝࠸ࡽࢀ࡚Ꮚ↷ᑕ࡟ࡼࡿࡢ IC ຎ໬ࡣࠊࡍ࡭࡚ࡢ ᗘ࡛᫂☜࡟࠸ࡿ࢚࣏࢟ࢩᶞ⬡࡞࡝ࢆᇶ࡟ࡋࡓ᭷ᶵᮦᩱࡣࠊ10☜ㄆࡓࠋSCS4050-AP ࡢ୺࡞⤌ᡂࡣ GdBCO ࡛

MGy ࢆ㉸࠼ࡿᨺᑕ⥺㔞࡛ࠊᶵᲔᙉᗘࡢపୗࡀ㢧࠶ࡾࠊ㉸ఏᑟᛶຎ໬࡟ᑐࡍࡿప࢚ࢿࣝࢠ࣮୰ᛶᏊ

ⴭ࡟࡞ࡿ[34]ࠋᩘ༑ MGy ࡲ࡛⪏࠼࠺ࡿ⤯⦕ᮦᩱࡢ኱ࡁ࡞ᐤ୚ࡣࠊ⣙ 49 kb ࡢ㧗࠸୰ᛶᏊ཯ᛂ᩿㠃࡜ࡋ࡚ࠊࢩ࢔ࢿ࣮ࢺ࢚ࢫࢸࣝࡸࣅࢫ࣐ࣞ࢖࣑ࢻࢺ

✚ࢆᣢࡘ Gd ࡟ࡼࡿࡶࡢ࡜᥎ ࡉࢀࡿ[33]ࠋᩥ⊩ࣜ࢔ࢪࣥࢆᇶ࡟ࡋࡓ⪏ᨺᑕ⥺ᶞ⬡ᮦᩱࡢ㛤Ⓨࡶ

[28] ࡣࠊ㧗㏿୰ᛶᏊࡢࣇ࢚ࣝࣥࢫࡀ 1022 n/m2㐍ࢇ࡛࠸ࡿࡀ[10]ࠊ100 MGy ㉸࠼ࡿᨺᑕ⥺⎔ቃ࡛ࡢ᱆࡛ YBCO ࡢ IC ࡀቑຍࡋࡓࡇ࡜ࡀሗ࿌ࡉࢀ࡚

౑⏝ࡍࡿࡇ࡜ࡣ㞴ࡋ࠸ࠋࡑࡇ࡛ᡃࠎࡣࠊࢭ࣑ࣛࢵ

࠾ࡾࠊࡉࡲࡊࡲ࡞ࢱ࢖ࣉࡢ REBCO ⥺ᮦ࡛↷ᑕヨࢡࢥ࣮ࢸ࢕ࣥࢢཬࡧࢭ࣑ࣛࣥࢡ࣎ࣥࢹ࢕ࣥࢢᢏ

㦂ࢆ⾜࠼ࡤࠊ཯ᛂ᩿㠃✚࡜㉸ఏᑟຎ໬࡜ࡢ㛵ಀࢆ⾡ࢆᛂ⏝ࡋࡓ↓ᶵ⤯⦕㉸ఏᑟࢥ࢖ࣝࡢᇶ♏ⓗ࡞᫂ࡽ࠿࡟࡛ࡁࡿ࠿ࡶࡋࢀ࡞࠸ࠋ

◊✲㛤Ⓨࢆ⾜ࡗ࡚࠸ࡿࠋᮏ㡯࡛ࡣࠊᩥ⊩[35]ࢆᇶ

ࣇ࢚ࣝࣥࢫ 8.23×1021 n/m2 ࡢ IC ࢆᮍ↷ᑕࢧࣥࣉࣝࡢ IC0 ࡛㝖ࡋࡓຎ໬⋡࡜ ᐃ ᗘࡢ㛵ಀࢆ
Fig. 6-9 ࡟♧ࡍࠋ ᐃ ᗘ 20 K ࡛⣙ 0.6 ࡔࡗࡓຎ࡟↓ᶵ⤯⦕ࢥ࢖ࣝࡢ㛤Ⓨ≧ἣࢆ⤂௓ࡍࡿࠋ
6.3.1. ࢥ࢖ࣝࡢタィ◊✲໬⋡ࡣࠊ77 K ࡛ࡣ 0.02 ࡟పୗࡋ࡚࠸ࡿࠋࡇࢀࡣHTS ࡢ⪏ᨺᑕ⥺☢▼ࡢྍ⬟ᛶࢆ᥈ࡿࡓࡵ࡟ࠊ

ຎ໬ࡢᙳ㡪ࡀ୍ᐃ࡛ࡣ࡞ࡃࠊ ᐃ ᗘ࡟౫Ꮡࡋ࡚

Phase-I ᐇ㦂ࡢ㝧Ꮚࣅ࣮࣒᮲௳㸦㸶GeV, 3 kW㸧࠸ࡿࡇ࡜ࢆ♧၀ࡋ࡚࠸ࡿࠋࡲࡓࠊప࠸ ᗘࡢຎ໬࡟࠾࠸࡚ࠊCOMET-PCS ࡜ྠ➼ࡢᛶ⬟ࢆᣢࡘࡀᑠࡉ࠸ഴྥ࡟࠶ࡿࡓࡵࠊ㐠㌿ ᗘࡀప࠸࡯࡝☢

REBCO ࢸ࣮ࣉ⥺ᮦࢆ⏝࠸ࡓࣃ࢖࢜ࣥᤕᤊࢯࣞ

▼ࡢᑑ࿨ࡀᘏࡧࡿ࡜ᛮࢃࢀࡿࠋᩥ⊩ [29] ࡛ࡶྠࣀ࢖ࢻࡢタィ◊✲ࡀ⾜ࢃࢀࡓ[11]ࠋෆᚄ 340 mmࠊ

ᵝ࡟ࠊ ᗘ࡟౫Ꮡࡋࡓຎ໬⋡ࡢపୗࡀほᐹࡉࢀ࡚ཌࡉ 25 mmࠊ㛗ࡉ 340 mm ࡢࢥࣥࣃࢡࢺ࡞ PCS

12㸫 16

ࡣࠊᖜ 4 mmࠊཌࡉ 0.1 mm ࡢ REBCO ࢸ࣮ࣉࢆࣇࣛࢵࢡࢫࢆ 1×1023 n/m2 ௨ୗ࡟タィࡉࢀ࡚࠾⏝࠸ࡓ 34 ಶࡢࢲࣈࣝࣃࣥࢣ࣮࢟ࢥ࢖ࣝࢆࢫࢱࢵ

ࡾࠊࢥ࢖ࣝࡢෆഃ࡟኱ࡁ࡞ࢱࣥࢢࢫࢸࣥྜ㔠〇ࡢࢡࡋࡓᵓ㐀࡟࡞ࡗ࡚࠾ࡾࠊCOMET-PCS ࡢ㔜㔞ࢆᨺᑕ⥺ࢩ࣮ࣝࢻࡀ㓄⨨ࡉࢀࡿࠋFig. 6-10 ࡢ㓄⨨ࡼ100 ศࡢ 1 ࡟⦰ᑠࡍࡿࡇ࡜ࡀ࡛ࡁࡿࠋᮏࣔࢹ࡛ࣝ

ࡿࣔࣥࢸ࢝ࣝࣟࢩ࣑࣮ࣗࣞࢩࣙࣥࡢ⤖ᯝࠊ୰ᛶᏊ

ࡣࠊ⣲⥺⤯⦕࡜ࡋ࡚↓ᶵ⤯⦕࡛ࡣ࡞ࡃཌࡉ 25ࣇࣛࢵࢡࢫࡣ 7.7×1020 n/m2/y ࡜࡞ࡾࠊᨺᑕ⥺࡟

Pm ࡢ࣏ࣜ࢖࣑ࢻࡀ REBCO ࡟ᕳࡁ௜ࡅࡽࢀ࡚࠸

ࡼࡿࢥ࣮ࣝࢻ࣐ࢫࡢⓎ⇕㔞ࡣ 650 W ࡜ぢ✚ࡽࢀࡿࠋࣔࣥࢸ࢝ࣝࣟࢩ࣑࣮ࣗࣞࢩࣙࣥ࡟ࡼࡾᨺᑕ⥺࡚࠸ࡿࠋࢥ࣮ࣝࢻ࣐ࢫࡣ 3 ྎࡢࢥ࢖ࣝࣈࣟࢵࢡ࠿

㔞ࡀィ⟬ࡉࢀࡿࡀࠊCOMET-PCS ࡼࡾࢥࣥࣃࢡࢺ

ࡽ࡞ࡗ࡚࠾ࡾࠊ1 ྎࡢࢥ࢖ࣝࣈࣟࢵࢡࡣࠊෆᚄ

࡟࡞ࡗࡓࡇ࡜࡛ࠊ⏕ᡂᶆⓗࢆᅖࡴ❧యゅࡀቑຍ

1600 mmࠊཌࡉ 21 mmࠊ㛗ࡉ 10 mm ࡢࢲࣈࣝࣃ

ࡋࠊᨺᑕ⥺࡟ࡼࡿⓎ⇕ᐦᗘࡣࠊ10 ಸࡢ 0.43 W/kgࣥࢣ࣮࢟෇ᙧࢥ࢖ࣝࢆ 20 ಶࢫࢱࢵࢡࡋࡓᵓ㐀࡟࡟ቑຍࡍࡿࠋࡋ࠿ࡋࠊ㔜㔞ࡣ 100 ศࡢ 1 ࡛࠶ࡿࡓ࡞ࡗ࡚࠸ࡿࠋ2 ᒙᵓ㐀ࡢࢥ࢖ࣝ࡟ࡣࠊᖜ 4 mmࠊࡵࠊ⥲Ⓨ⇕㔞ࡣ 10 ศࡢ 1 ࡜࡞ࡾ 7.1 W ࡜࡞ࡿࠋཌࡉ 0.1 mm ࡢ REBCO ࢸ࣮ࣉࡀ 1 ᒙᙜࡓࡾ 70ࡲࡓࠊ࣮࣋ࢫ ᗘࢆ 20 K ࡛㐠㌿ࡋࡓሙྜࠊ⣧࢔ࢱ࣮ࣥᕳ࠿ࢀ࡚࠸ࡿࠋ㐠㌿㟁ὶ 200 A ࡟࠾࠸࡚ࠊ

࣑ࣝࢽ࣒࢘෭༷ᯈࡢ㠀ᖖ࡟㧗࠸⇕ఏᑟ⋡ࢆά࠿ࢯࣞࣀ࢖ࢻ㍈ୖࡢ᭱኱☢ሙࡣ 1.1 Tࠊࢥ࢖ࣝෆࡢ

ࡍࡇ࡜ࡀ࡛ࡁࠊ
ࢥ࢖ࣝࡢ ᗘࡣ᭱኱࡛ࡶ 21.6 K ࡲ᭱኱☢ሙࡣ 2.3 T ࡜࡞ࡾࠊ㈇Ⲵ⋡ࡣ 48㸣࡛࠶ࡿࠋ࡛ࡋ࠿ୖ᪼ࡋ࡞࠸ࠋࡇࡢࡼ࠺࡟ REBCO ࢆ⏝࠸ࡓTS2-PSC ࡢᐇ⌧ྍ⬟ᛶࢆ᳨ドࡍࡿࡓࡵ࡟ࠊ

PCS ࡣࠊࢧ࢖ࢬ࠾ࡼࡧ෭༷࡟㛵ࡋ࡚ᚑ᮶ࡢࡶࡢࡼREBCO ࢸ࣮ࣉࢆ⏝࠸ࡓᑠᆺࡢ↓ᶵ⤯⦕ࢥ࢖ࣝࡾ኱ࡁ࡞ඃ఩ᛶࢆᣢࡘࡇ࡜ࡀ☜ㄆࡉࢀࡓࠋ

ࡢ㛤Ⓨࢆ⾜ࡗࡓࠋ ᳨ドࢥ࢖ࣝࡣࠊෆᚄ 80 mmࠊ

ୖグࡢඛ⾜◊✲ࢆᇶ࡟ࠊTS2-PCS ࡢᴫᛕタィࡀ

1 ᒙ࠶ࡓࡾ⣙ 30 ࢱ࣮ࣥࡢ෇ᙧࢲࣈࣝࣃࣥࢣ࣮

⾜ࢃࢀࡓ[36]ࠋFig. 6-10 ࡟ TS2-PCS ࡢᵓ㐀࡜☢

࢟ᆺ࡜࡞ࡗ࡚࠾ࡾࠊFig.6-11 ࡟ HTS ᳨ドࢥ࢖ࣝሙศᕸࢆ♧ࡍࠋTS2-PCS ࡣࠊᚋ᪉࡟⏕ᡂࡉࢀࡿࣃ

ࡢᵓ㐀ᅗࢆ♧ࡍࠋ ᳨ドࢥ࢖ࣝࡣࠊࢭ࣑ࣛࢵࢡ᥋╔࢖࢜ࣥ࡜࣑࣮ࣗ࢜ࣥࡢᤕ⋓㔞ࢆ᭱኱໬ࡍࡿࡓࡵ

๣࡛ࢭ࣑ࣛࢵࢡࢥ࣮ࢸ࢕ࣥࢢࡉࢀࡓ REBCO ࢸ࡟ࠊ࢚ࢿࣝࢠ࣮㸱GeVࠊࣅ࣮࣒ࣃ࣮࣡1 MW ࡢ኱࣮ࣉ࡛ᕳ࠿ࢀ࡚࠸ࡿࠋࢱ࣮ࣥ㛫࡟ሬᕸࡉࢀࡿࢭࣛ

ᙉᗘ㝧Ꮚࣅ࣮࣒ࡀ↷ᑕࡉࢀࡿ⏕ᡂᶆⓗࡢ┤ୗὶ࣑ࢵࢡ᥋╔๣ࡣࠊ㟁Ẽ⤯⦕࡜ࢥ࢖ࣝࡢᶵᲔⓗᙉᗘ࡟㓄⨨ࡉࢀࡿࠋTS2-PCS ࡣࠊ10 ᖺ㛫ࡢ㐠⏝ᮇ㛫ࡢᙉ໬ࡀᮇᚅࡉࢀ࡚࠸ࡿࠋ ᳨ドࢥ࢖ࣝࡣࠊᶵᲔⓗ࡛ 6. 2. 1. 㡯࡛グ㏙ࡋࡓࡼ࠺࡟ࢥ࢖ࣝ࡬ࡢ୰ᛶᏊ

)LJ763&6 ࡢᵓ㐀࡜☢ሙศᕸ

)LJ+76 ᳨ドࢥ࢖ࣝࡢᵓ㐀ᅗ

12㸫 17ᙉᗘ࡜⇕ఏᑟࢆᙉ໬ࡍࡿࡓࡵ࡟ࠊࢭ࣑ࣛࢵࢡ ࢥࢵࢺ࡟ࡋࡓ᪋ᕤࡢ⧞ࡾ㏉ࡋᅇᩘ࡛ㄪᩚࡉࢀࡿࠋ

࣮ࢸ࢕ࣥࢢࡉࢀࡓ࢔࣑ࣝࢽ࣒࢘〇㒊ရ࡜⣧࢔ࣝ

SCS4050-AP ࡢ▷ᑻࢧࣥࣉࣝࢆ౑⏝ࡋࡓヨ㦂࡛ࠊ࣑ࢽ࣒࢘ఏ⇕∧࡜ࢭ࣑ࣛࢵࢡ᥋╔๣୍࡛య໬ࡉ

100Υ࡛ 20 ศ㛫ࡢ᭱㐺࡞᭱⤊⇕ฎ⌮᮲௳ࡀ☜ㄆ

ࢀࡿࠋ

ࡉࢀࡓࠋ
Fig. 6-13 ࡟┠ᶆ⭷ཌ ǍP ࡢࢭ࣑ࣛࢵࢡࢥ࣮

6.3.2. ࢭ࣑ࣛࢵࢡࢥ࣮ࢸ࢕ࣥࢢࡢᛂ⏝ࢸ࢕ࣥࢢࢆ᪋ࡋࡓ REBCO ࢸ࣮ࣉࡢ඲య࠾ࡼࡧ᩿

A. REBCO ࢧࣥࣉࣝ࡬ࡢࢥ࣮ࢸ࢕ࣥࢢ

㠃෗┿ࢆ♧ࡍࠋREBCO ࢸ࣮ࣉࡢ⾲㠃࡟ࡣࠊཌࡉ

ࢭ࣑ࣛࢵࢡࢥ࣮ࢸ࢕ࣥࢢ࡟㛵ࢃࡽࡎࠊ⥺ᮦ࡟ఱ⣙ 40 ǍP ࡢࢭ࣑ࣛࢵࢡᒙࡀᙧᡂࡉࢀ࡚࠸ࡿࠋࢥ࣮

࠿ࡋࡽࡢ᪉ἲ࡛⾲㠃ฎ⌮ࢆ⾜࠺㝿࡟ࡣࠊ࡯࡜ࢇ࡝

ࢸ࢕ࣥࢢᚋࡢࢧࣥࣉࣝࡣࠊ࣏࢖ࣥࢺࣉ࣮ࣟࣈࢆ⏝ࡢሙྜ⇕ฎ⌮ࡀᚲせ࡛࠶ࡿࠋࡋ࠿ࡋࠊ㧗 ⎔ቃ࡛࠸ࡓ⪏㟁ᅽヨ㦂࡟ࡼࡾ㟁Ẽ⤯⦕ᛶ⬟ࡢホ౯ࡀ⾜

REBCO ㉸ఏᑟ≉ᛶࡣ㓟⣲ࡢ⵨Ⓨ࡟ࡼࡾపୗࡍࡿ

ࢃࢀࡓࠋ⪏㟁ᅽヨ㦂ࡢ㈇Ⲵࡣࠊ࿘Ἴᩘ 50 Hz ࡢ஺ࡇ࡜ࡀ▱ࡽࢀ࡚࠸ࡿࠋFig. 6-12 ࡟ᡃࠎࡀ ᐃࡋࡓὶ㟁ᅽ࡛୚࠼ࡽࢀࡓࠋFig. 6-14 ࡟⤯⦕◚ቯ㟁ᅽࡢ

SCS4050-AP ࡢ⇕ᒚṔ࡟ࡼࡿ IC ࡢపୗࢆ♧ࡍࠋ⭷ཌ౫Ꮡᛶࢆ♧ࡍࠋ ⤯⦕◚ቯ㟁ᅽࡣࠊཌࡉ 24 PmỈᖹ㍈ࡢ⤒㐣᫬㛫ࡣࠊ஝⇱⅔ෆࡢタᐃ ᗘ࡛ࡢಖᣢ᫬㛫ࢆ⾲ࡋ࡚࠸ࡿࠋ⤒㐣᫬㛫㸮ࡢሙྜࠊࢧࣥࣉࣝࡣタᐃᗘ࡟฿㐩┤ᚋ࡟஝⇱⅔ࡢࣄ࣮ࢱฟຊ

ࡀࢮࣟ࡟࡞ࡾ⮬↛෭༷ࡉࢀ࡚࠸ࡿࠋ౛࡜ࡋ࡚ࠊ
180Υ࡛ 5 ᫬㛫ࡢ⇕ฎ⌮ࢆ⾜ࡗࡓሙྜࠊIC ࡀ 10㸣పୗࡍࡿࠋࡇࡢ ᗘࡣࠊ୍⯡ⓗ࡞ࢭ࣑ࣛࢵࢡࢫࡢ
↝⤖ ᗘࡼࡾࡶ㐶࠿࡟ప࠸ࠋࡑࡇ࡛ࠊᡃࠎࡣẚ㍑ⓗప࠸ᗘ࡛ࡶᡂ⭷ྍ⬟࡞ࢰ࣮ࣝࢤࣝἲ࡟ࡼࡿ

ࢭ࣑ࣛࢵࢡࢥ࣮ࢸ࢕ࣥࢢᢏ⾡࡟╔┠ࡋࠊREBCOࡸ☢▼㒊ရࡢ㟁Ẽ⤯⦕࡬ࡢᛂ⏝ࢆヨࡳࡓࠋᕷ㈍ࡢ
࠸ࡃࡘ࠿ࡢࢥ࣮ࢸ࢕ࣥࢢ๣࡛ࠊࢫࣉ࣮ࣞࠊๅẟሬࡾࠊࢹ࢕ࣥࣆࣥࢢ➼ࡢ᪉ἲ࡛ヨ⾜㘒ㄗࢆ⧞ࡾ㏉ࡋࡓ⤖ᯝࠊ⌧᫬Ⅼ࡛᭱㐺໬ࡉࢀ࡚࠸ࡿ᪉ἲࡣࠊSiO2)LJ ࢥ࣮ࢸ࢕ࣥࢢᚋࡢࢧࣥࣉࣝࡢ෗┿࡜ Al2O3 ࢆ 1:1 ࡛≉ู࡟㓄ྜࡋࡓ᪥◊〇 G925 ሬᩱࢆࢫࣉ࣮࡛ࣞࡢሬᕸ࡛࠶ࡿࠋ⤯⦕ᒙࡢ⭷ཌ
ࡣࠊ1 ᅇࡢࢫࣉ࣮ࣞ࡜ 80Υ࡛ 10 ศ㛫ࡢ஝⇱ࢆࢭ

)LJ ⇕ᒚṔ࡟ࡼࡿ ,& ࡢపୗ)LJ ⤯⦕◚ቯ㟁ᅽࡢ⭷ཌ౫Ꮡᛶ12㸫 18᭷ࡽࢀࡓ࣮ࣜࣝ࡟ᕳࡁྲྀࡽࢀࡿࠋࢸ࣮ࣉࡢ⤒㊰ࡣࣉ࣮࣮ࣜࢆ⏝࠸࡚⾜ࢃࢀࡿࡀࠊࣉ࣮࣮ࣜ࡜ࡢ᥋ゐ㠃ࡣࢫࣉ࣮ࣞ࡟ࡼࡿሬᕸ㠃࡜཯ᑐ࡟࡞ࡿࠋ⭷ཌไᚚࡢࡓࡵࡢ⧞ࡾ㏉ࡋ᪋ᕤ࡛ࡣࠊ࣮ࣜࣝࢆ㏫ᅇ㌿ࡉࡏ࡚ࠊࢸ࣮ࣉ఩⨨ࢆඖ࡟ᡠࡋ෌᪋ᕤࡉࢀࡿࠋ᪉ഃ
ࢥ࣮ࢸ࢕ࣥࢢ᏶஢ࡢᚋࠊ࣮ࣜࣝࢆྲྀእࡋࢸ࣮ࣉ㠃⾲⿬ࢆ㏫࡟ࡋ࡚ࠊࡶ࠺∦᪉ࡢࢥ࣮ࢸ࢕ࣥࢢࡀ᪋ᕤ
ࡉࢀࡿࠋ▷ᑻࢧࣥࣉࣝ࡟ࡼࡗ࡚᭱㐺໬ࡉࢀࡓ⇕ฎ⌮᮲௳ࡣࠊ10 ಶࡢ⁥㌴࡛ ࣃࢫ㛗 7.6 m ࡢ⇕ฎ⌮ࢭࢡࢩࣙࣥࡢ㏻㐣᫬㛫࡟ࡼࡗ࡚ㄪᩚࡉࢀࡿࠋ౛࠼
ࡤࠊ80Υ࡛ 10 ศ㛫ࡢ஝⇱ࡢሙྜࠊ㛗ࡉ 380 mm
ࡢࢸ࣮ࣉࡢ୍㒊࡟ࢫࣉ࣮ࣞࡋࠊ⇕ฎ⌮ࢭࢡࢩࣙࣥ

)LJ ࢥ࣮ࢸ࢕ࣥࢢ๓ᚋࡢ ,& ࡢẚ㍑

࡟㏦ࡾ㎸ࡴ᫬㛫ࡣ 30 ⛊࡛࠶ࡿࠋ(┠ᶆཌࡉ 30 Pm) ࡛チᐜ㟁ᅽࡢ 2 kV ௨ୖ࡟࡞ࡗ

Fig. 6-17 ࡟∦㠃 8 m ࡟ࢃࡓࡗ࡚ࢥ࣮ࢸ࢕ࣥࢢ

ࡓࠋ Fig. 6-15 ࡣࠊእ㒊☢ሙ࡞ࡋࡢᾮయ❅⣲୰࡛ࡉࢀࡓ REBCO ࢸ࣮ࣉࡢ⭷ཌࡢࢭ࣑ࣛࢵࢡࢥ࣮ࢸ࢕ࣥࢢ๓ᚋࡢ IC ࡢẚ㍑ࢆ♧ࡍࠋᖹᆒཌࡉ 19 Pm ࡢࢭ࣑ࣛࢵࢡ⤯⦕⭷ࢆ 8 m

ࡋ࡚࠸ࡿࠋࢥ࣮ࢸ࢕ࣥࢢࡉࢀࡓ REBCO ࢸ࣮ࣉࡢࡢ㛗ᑻࢸ࣮ࣉ࡟ᙧᡂ࡛ࡁࡓࠋࡓࡔࡋࠊࢫࣉ࣮ࣞࡸIC ࡣࠊᮍ᪋ᕤࡢࢧࣥࣉࣝ࡜ࡢ᭷ព࡞ᕪࡣࡳࡽࢀ࡞

ࢸ࣮ࣉ㏦ࡾࡣேࡢᡭ࡛⾜ࢃࢀ࡚࠾ࡾࠊ⭷ཌࡢࡤࡽ࠸ࠋ⇕ฎ⌮᫬㛫ࡀ▷࠸ࡓࡵࠊ㉸ఏᑟ≉ᛶࡢ⇕ᒚṔࡘࡁࡀ኱ࡁ࠸ࠋ

࡟ࡼࡿຎ໬ࡀ࡞࠸஦ࡀ☜࠿ࡵࡽࢀࡓࠋࢭ࣑ࣛࢵࢡ

ᐃࡢ⤖ᯝࢆ♧⌧ᅾࠊ㐃⥆ࢥ࣮ࢸ࢕ࣥࢢ⿦⨨ࡣᨵⰋࡉࢀࠊࢥ࣮⿕そࢸ࣮ࣉ࡟ᐊ 㹼77 K ࡢ⧞ࡾ㏉ࡋ⇕㈇Ⲵࢆ 10ᅇ௨ୖ୚࠼࡚ࡶࠊእほࠊ⤯⦕᢬ᢠࠊ⮫⏺㟁ὶ࡟ኚ໬ࡣ࡞ࡃࠊⰋዲ࡞⤯⦕⭷ࡀᡂᙧࡉࢀ࡚࠸ࡿࡇ࡜ࡀ
☜ㄆࡉࢀࡓࠋ

B. 㛗ᑻࢸ࣮ࣉࡢ㐃⥆ࢥ࣮ࢸ࢕ࣥࢢ
▷ᑻࢧࣥࣉࣝ࡟ࡼࡗ࡚᪋ᕤ᮲௳ࡢ᭱㐺໬ࡀ⾜ࢃࢀࡓࠋḟ࡟ࡑࡢ᮲௳ࢆᇶ࡟㛗ᑻࢸ࣮ࣉ࡬ࡢ㐃⥆ࢥ࣮ࢸ࢕ࣥࢢࡢヨ⾜ࡀ⾜ࢃࢀࡓࠋFig. 6-16 ࡟㛤Ⓨࡉࢀࡓ㐃⥆ࢥ࣮ࢸ࢕ࣥࢢࢩࢫࢸ࣒ࡢ෗┿ࢆ♧ࡍࠋ
REBCO ࢸ࣮ࣉࡣ࣮ࣜࣝ࡟ᕳ࠿ࢀࡓ≧ែ࡛㏦ฟࡋᶵ࡟ࢭࢵࢺࡉࢀࡿࠋࢸ࣮ࣉࡣࢫࣉ࣮ࣞࢭࢡࢩࣙ
)LJ ࢥ࣮ࢸ࢕ࣥࢢࢸ࣮ࣉࡢ⭷ཌࣥࠊ⇕ฎ⌮ࢭࢡࢩࣙࣥࢆ௓ࡋᕳࡁྲྀࡾᶵྲྀࡾ௜ࡅ

ᐃ⤖ᯝࢸ࢕ࣥࢢ๣ᄇᑕᶵ㸦⮬ືࢫࣉ࣮ࣞ㸧ࡢ㏣ຍ࡜㏦ฟ
ࡋ㏿ᗘࡢ୍ᐃ໬ࡀᅗࡽࢀࡓࠋࡑࡢ⤖ᯝࠊ㛗ࡉ 40 m
ࡢ REBCO ࢸ࣮ࣉ୧㠃࡟ࡑࢀࡒࢀ±4.3 Pm(V)ࡢ
ᆒ୍ᗘ࡛ࡢ⤯⦕⭷ࢥ࣮ࢸ࢕ࣥࢢ࡟ᡂຌࡋ࡚࠸ࡿࠋ
6.3.3. ᳨ドࢥ࢖ࣝࡢᕳࡁ⥺↓ᶵ⤯⦕ࢥ࢖ࣝࡢᐇ⌧ᛶࢆ᳨ドࡍࡿࡓࡵ࡟ࠊ

)LJ 㐃⥆ࢥ࣮ࢸ࢕ࣥࢢࢩࢫࢸ࣒ࡢ෗┿Fig. 6-16 ࡢ㐃⥆ࢥ࣮ࢸ࢕ࣥࢢ⿦⨨࡛୧㠃ࢭ࣑ࣛ

12㸫 19ࢵࢡࢥ࣮ࢸ࢕ࣥࢢࡉࢀࡓ㛗ࡉ 14 m ࡢ REBCO ࢸࡗ࡚ไᚚࡉࢀࡿࣇ࢕࣮ࢲ࣮࡟ࡼࡗ࡚ࠊ0.85㹼0.95

࣮ࣉࢆ౑⏝ࡋ࡚ࠊࢭ࣑ࣛࢵࢡ᥋╔๣ࢆ⏝࠸ࡓ࢙࢘kg ࡟ㄪᩚࡉࢀࡓࠋ 1 ᅇ┠ࡢᕳ⥺ヨస࡛ࠊ1 ᒙ┠ࢵࢺ࣡࢖ࣥࢹ࢕ࣥࢢ᪉ᘧ࡛ࠊᑠᆺࡢࢲࣈࣝࣃࣥࢣ

26 ࢱ࣮ࣥࠊ2 ᒙ┠ 24 ࢱ࣮ࣥࡢ෇ᙧࢩ࣮࣒ࣞࢫࢲ

࣮࢟ࢥ࢖ࣝࡢᕳࡁ⥺ࡀ⾜ࢃࢀࡓࠋ࠸ࡃࡘ࠿ࡢᕷ㈍ࣈࣝࣃࣥࢣ࣮࢟ࢥ࢖ࣝࡢ〇స࡟ᡂຌࡋࡓࠋFig. 6-ࡢࢭ࣑ࣛࢵࢡ᥋╔๣ࢆ⏝࠸࡚ࢫࢱࢵࢡࢧࣥࣉࣝ

18 ࡣࠊ↓ᶵ⤯⦕ࣉࣟࢭࢫ࡛ᕳ࠿ࢀࡓ᭱ึࡢ᳨ド〇సࢆ⧞ࡾ㏉ࡋࡓ⤖ᯝࠊ᳨ドࢥ࢖ࣝᕳ⥺⏝ࡢ᥋╔ࢥ࢖ࣝࡢ෗┿࡛࠶ࡿࠋࢥ࢖ࣝࡢᖹᆒཌࡉࡣࠊ1 ᒙ๣࡟ࡣᮾவྜᡂᰴᘧ఍♫〇࢔ࣟࣥࢭ࣑ࣛࢵࢡ®ࢱ┠࡛ 5.71 mmࠊ2 ᒙ┠࡛ 5.49 mm ࡛࠶ࡾࠊࢥ࣮

࢖ࣉ C ࢆ᥇⏝ࡋࡓ(https://www.toagosei.co.jp)ࠋ

ࢸ࢕ࣥࢢᒙ࡜᥋╔๣࠿ࡽᵓᡂࡉࢀࡿࢸ࣮ࣉ㛫ࡢࡇࡢ᥋╔๣ࡢ◳໬᮲௳ࡣࠊᐊ ࡛ 16 ᫬㛫஝⇱ࡉ⤯⦕ᒙࡢ᭷ຠཌࡉࡣࠊ0.13 mm ࡜᥎ᐃࡉࢀࡿࠋ

ࡏࡓᚋࠊ90Υ࡛ 1 ᫬㛫ࠊ150Υ࡛ 1 ᫬㛫ࡢ⇕ฎ⌮᳨ドࢥ࢖ࣝࡢ೺඲ᛶࡢ☜ㄆࡢࡓࡵ࡟ࠊ㉸ఏᑟ㌿

࡛ⰋࡃࠊIC ࡢపୗࡀ㉳ࡇࡽ࡞࠸࡜᥎ ࡛ࡁࡿࠋࡲ⛣ᗘࡀ ᐃࡉࢀࡓࠋ4 ➃Ꮚἲ࡟ࡼࡾ ᐃࡉࢀࡓࡓࠊࢱ࢖ࣉ C ࢆ㑅ᐃࡋࡓ⌮⏤ࡣࠊ0Υ࡛ 13×10-6

ᐊ࡛ࡢࢥ࢖ࣝ᢬ᢠࡣ 1.57 :࡜࡞ࡾࠊᕳࡁ⥺๓ࡢ/Υࡢ⥺⭾ᙇಀᩘࡣࠊ௚ࢱ࢖ࣉࡼࡾࡶ REBCO ࢸ

14 m 㛗ࡢ REBCO ࢸ࣮ࣉࡢ᢬ᢠ್࡜ྠࡌ್࡛࠶

࣮ࣉࡸ㔠ᒓ〇ࡢࢧ࣏࣮ࢺ㒊ရࡢ⥺⭾ᙇಀᩘ࡟㏆ࡾࠊࢥ࢖ࣝࡢࢱ࣮ࣥ㛫ࢩ࣮ࣙࢺ࡞࡝ࡢၥ㢟ࡣ㉳ࡇ࠸஦࡛࠶ࡾࠊ෭༷࡟ࡼࡿ⇕཰⦰ࡢᙳ㡪ࢆᑠࡉࡃ࡛

ࡗ࡚࠸࡞࠸ࠋFig. 6-19 ࡟኱Ẽ୰࡛ᾮయ❅⣲ࢆ⏝࠸ࡁࡿࠋ࡚෭༷ࡉࢀࡓࢥ࢖ࣝ᢬ᢠࡢኚ໬ࢆ♧ࡍࠋ ᗘࡣࢥ᳨ドࢥ࢖ࣝࡣࠊ┠ᶆ⭷ཌ 50 Pm ࡛ࢭ࣑ࣛࢵࢡࢥ

࢖ࣝ⾲㠃࡟ྲྀࡾ௜ࡅࡽࢀࡓⓑ㔠᢬ᢠయ࣮ࢸ࢕ࣥࢢࡉࢀࡓࢫࢸࣥࣞࢫ㗰〇ࡢ෇ᙧࡢࢭࣥ

㸦Pt100㸧࡛ ᐃࡉࢀ࡚࠸ࡿࡀࠊࡇࢀࡣࢥ࢖ࣝ⾲㠃ࢱ࣮࣎ࣅࣥ࡟᥋╔๣ࢆሬᕸࡋࡘࡘࢸ࣮ࣉࢆᕳࡁ

ࡢ௜ࡅࡿࡇ࡜࡛〇సࡉࢀࡓࠋࢸ࣮ࣉࡢᙇຊࡣࠊࣂࢿ

௜㏆࡟㉸ఏᑟ㌿⛣࡟క࠺᢬ᢠ್ࡢᛴ⃭࡞⌧㇟ࡀࢆ⏝࠸࡚ࢭࣥࢱ࣮ࣟࢵࢻ࡜࣋ࣝࢺ㛫ࡢᦶ᧿࡟ࡼ

ぢࡽࢀࡓࠋࡇࢀࡣ REBCO ⥺ᮦࡢ㉸ఏᑟ≉ᛶࡀຎᗘ࡜⎔ቃ ᗘྜࢃࡏࡓཧ⪃ ᗘ࡛࠶ࡿࠋ90 K໬ࡋ࡚࠸࡞࠸ࡇ࡜ࢆ♧ࡋ࡚࠾ࡾࠊ↓ᶵ⤯⦕㉸ఏᑟ☢▼ࡢᐇ⌧࡟ྥࡅࡓ኱ࡁ࡞୍Ṍ࡜࡞ࡗࡓࠋHTS ࡢຍ㏿ჾࡸཎᏊ᰾࣭⣲⢏Ꮚᐇ㦂⿦⨨࡬ࡢᛂ⏝ࡣୡ⏺୰࡛㛵ᚰࡀ㧗ࡲࡗ࡚࠾ࡾࠊREBCO ࡟㝈ࡽࡎᵝࠎ࡞◊✲ࡀ⾜ࢃࢀ࡚࠸ࡿࠋᡃࠎࡣࠊHTS ࡢᛂ⏝࡟㛵ࡋ࡚ࠊி㒔኱Ꮫࠊᮾ໭኱Ꮫࠊ࣮ࣟࣞࣥࢫ
ࣂ࣮ࢡ࣮ࣞ◊✲ᡤ㸦LBNL㸧ࠊࣈࣝࢵࢡ࣊ࣈࣥᅜ❧◊✲ᡤ㸦BNL㸧࡜ඹྠ◊✲ࢆ⾜ࡗ࡚࠸ࡿࠋࡑࡢࣉ

)LJ ᳨ドࢥ࢖ࣝࡢ෗┿)LJ ヨ㦂⏝࣮ࣞࢫࢺࣛࢵࢡࢥ࢖ࣝࡢᵓ㐀12㸫 20ලయ౛࡜ࡋ࡚ࠊCOMET ᐇ㦂⏝ࣃ࢖࢜ࣥᤕ⋓ࢯࣞࣀ࢖ࢻࡢタィ࡛ࡣ㟁☢Ẽ≉ᛶࠊ⇕≉ᛶࠊᶵᲔ≉ᛶࡀ┦஫࡟ᙳ㡪ࢆཬࡰࡍࡓࡵࠊ᭷㝈せ⣲ἲࢆ⏝࠸ࡓ㐃ᡂゎᯒࡣ㠀ᖖ࡟᭷ຠ᪉ἲ࡛࠶ࡗࡓࠋ㧗ᨺᑕ⥺⎔ቃ࡛ࡢ㐠㌿ࡉࢀࡿ㉸ఏᑟ☢▼ࡢሙྜࠊୖグ࡟ຍ࠼࡚⥺㔞࡟౫Ꮡࡋࡓᮦᩱ≉ᛶࡢຎ໬ࡸ⇕㈇Ⲵ➼ࡶ⪃៖ࡍࡿᚲせࡀ࠶ࡿࠋ㐠㌿⎔ቃࡀ 100 MGy ㉸࠼ࡿࡼ࠺࡞ࠊᑗ᮶ࡢ⪏ᨺᑕ⥺㉸ఏᑟ☢▼ࡢᐇ⌧ࢆ┠ᣦࡋࡓᇶ♏㛤Ⓨ◊✲ࡢ⌧≧ࡶ⤂௓ࡋࡓࠋḟୡ௦⪏ᨺᑕ⥺㉸ఏᑟ☢▼)LJ ヨ㦂⏝࣮ࣞࢫࢺࣛࢵࢡࢥ࢖ࣝࡢᵓ㐀ࡢ⥺ᮦೃ⿵࡛࠶ࡿ࢖ࢵࢺ࣒ࣜ࢘⣔㧗ࣟࢢ୍࣒ࣛࡘ࡜ࡋ࡚ࠊ↓ᶵ⤯⦕ REBCO ࢥ࢖ࣝࡢ

ࡢ REBCO ࡜࿧ࡤࢀࡿࢸ࣮ࣉ⥺ᮦࡢ↷ᑕຠᯝࡢ◊㧗☢ሙヨ㦂ࡀィ⏬ࡉࢀ࡚࠸ࡿࠋᡃࠎࡣୖグࡢᡭἲ✲ࢆ⾜ࡗ࡚࠾ࡾࠊ࣐࢞ࣥ⥺↷ᑕ࡛ࡣ 27.4 MGy ࡲ

ࢆ㋃くࡋ࡚ Fig. 6-20 ࡟♧ࡉࢀ࡚࠸ࡿࡼ࠺࡞㛗ᑻ࡛⮫⏺㟁ὶࡢຎ໬ࡣほ ࡉࢀ࡞࠿ࡗࡓࠋ୍᪉ࠊ୰ࡢ ࣞ ࣮ ࢫ ࢺ ࣛ ࢵ ࢡ ࢥ ࢖ ࣝ ࢆ 〇 స ࡋ ࠊ BNL ࡢᛶᏊ↷ᑕ࡟࠾࠸࡚ࠊ୰ᛶᏊࣇ࢚ࣝࣥࢫ 8.23×1021

Nb3Sn ࣮ࣞࢫࢺࣛࢵࢡ࡛ᵓᡂࡉࢀ࡚࠸ࡿヨ㦂タ

n/m2 ࡛ຎ໬ࡀほ ࡉࢀࠊ4.11×1022 n/m2 ࡛㉸ఏഛ࡛ࠊእ㒊☢ሙ⣙ 10 Tࠊ ᗘ 4.2 K ࡛ࡢヨ㦂ࢆィᑟᛶࡀᾘኻࡋࡓࠋప࢚ࢿࣝࢠ࣮୰ᛶᏊࡢᐤ୚ࡀ኱

⏬ࡋ࡚࠸ࡿࠋ⌧ᅾࠊࢲ࣑࣮࡜ࡋ࡚ྠᙧ≧ࡢ㖡ࢸ࣮ࡁ࠸ࡇ࡜ࡀ♧၀ࡉࢀ࡚࠾ࡾࠊCd ࡟ࡼࡗ࡚ࢩ࣮ࣝ

ࣉࢆ⏝࠸࡚ᕳࡁ⥺ࢆ⾜࠸ࠊࢥ࢖ࣝ㒊ရࡸᕳࡁ⥺἞ࢻࡉࢀࡓࢧࣥࣉࣝࡢ↷ᑕࢆ⾜࠸ຎ໬࣓࢝ࢽࢬ࣒

ලࡢᨵⰋ࡜ඹ࡟ᢏ⾡ࡢ⩦⇍ࢆ⾜ࡗ࡚࠸ࡿࠋ๓㡯࡛ࡢ⌮ゎࢆ῝ࡵࠊ௒ᚋࡢ☢▼㛤Ⓨ࡟⏕࠿ࡋ࡚࠸ࡃࠋ

グ㏙ࡋࡓ㛗ࡉ 40 m ࡢ REBCO ࢸ࣮ࣉ⥺ᮦ࡬ࡢࢭࢭ࣑ࣛࢵࢡࢥ࣮ࢸ࢕ࣥࢢཬࡧ᥋╔ᢏ⾡ࢆ⏝࠸࣑ࣛࢵࢡࢥ࣮ࢸ࢕ࣥࢢࡣ᪤࡟᏶஢ࡋ࡚࠾ࡾࠊ㛫ࡶࡓ↓ᶵ⤯⦕ࢥ࢖ࣝࡢ◊✲㛤Ⓨࢆ㐍ࡵ࡚࠾ࡾࠊࢥ࣮

࡞ࡃ㧗☢ሙヨ㦂⏝ࡢ࣮ࣞࢫࢺࣛࢵࢡࢥ࢖ࣝࡢᕳ

ࢸ࢕ࣥࢢ๣ࢆࢫࣉ࣮ࣞࡋ 100Υ࡛⇕ฎ⌮ࡍࡿࡇ࡜ࡁ⥺ࡀ㛤ጞࡉࢀࡿࠋ

࡛ࠊࢸ࣮ࣉ⾲㠃࡟ SiO2 ࡜ Al2O3 ࡛ᵓᡂࡉࢀࡿⰋ

㉸ఏᑟయዲ࡞⤯⦕⭷ࢆᡂᙧࡍࡿࡇ࡜࡟ᡂຌࡋࡓࠋࡲࡓࠊ↓7. ࡲ࡜ࡵ࡜ㅰ㎡ᶵ⤯⦕㉸ఏᑟࢥ࢖ࣝࡢᐇ⌧ᛶࢆㄪ࡭ࡿࡓࡵ࡟ࢥ

㧗࠸ᨺᑕ⥺⎔ቃ࡛㐠⏝ࡉࢀࡿ㉸ఏᑟ☢▼ࡢᛂ࣮ࢸ࢕ࣥࢢࡉࢀࡓࢸ࣮ࣉ⥺ᮦࢆ⏝࠸࡚ࢭ࣑ࣛࢵ

⏝౛࡜ࡋ࡚ࠊCOMET ᐇ㦂⏝࣑࣮ࣗ࢜ࣥࣅ࣮࣒ࣛ

ࢡ᥋╔๣࡟ࡼࡿᑠᆺࡢ෇ᙧࢲࣈࣝࣃࣥࢣ᳨࣮࢟

࢖ࣥ࡜ J-PARC-MLF ➨ 2 ࢱ࣮ࢤࢵࢺࢫࢸ࣮ࢩࣙ

ドࢥ࢖ࣝࡀ〇సࡉࢀࡓࠋ᳨ドࢥ࢖ࣝࡢ㉸ఏᑟ≉ᛶࣥ⏝ࣃ࢖࢜ࣥᤕ⋓ࢯࣞࣀ࢖ࢻࡢ㛤Ⓨཬࡧᇶ♏◊࡟ຎ໬ࡀぢࡽࢀ࡞࠸ࡇ࡜࠿ࡽࠊᡃࠎࡢᡭἲࡢ᭷ຠ

✲ࡀ⤂௓ࡉࢀࡓࠋ㏆ᖺࡢ࣑࣮ࣗ࢜ࣥࣅ࣮࣒ࣛ࢖ࣥ

ᛶࡀ☜ㄆࡉࢀࡓࠋḟࡢ┠ᶆ࡜ࡋ࡚ࠊBNL ࡟࠾ࡅࡿ࡛ࡣࠊ2 ḟ⢏Ꮚ⏕ᡂᶆⓗࢆࢯࣞࣀ࢖ࢻෆ㒊࡟㓄⨨పࡋᶆⓗୖ࡟༳ຍࡉࢀࡓᙉ☢ሙ࡛࣑࣮ࣗ࢜ࣥཬࡧ

ࢥ࢖ࣝࡢ㛤Ⓨࡀ㐍⾜୰࡛࠶ࡿࠋ

ࣃ࢖࢜ࣥࢆࢺࣛࢵࣉࡍࡿࡓࡵࠊᚑ᮶ࡢ 2 ḟ⢏Ꮚࣅࠊ㧗☢ሙヨ㦂ࢆ┠ᣦࡋࡓ㛗ᑻ࣮ࣞࢫࢺࣛࢵࢡ
᭱ᚋ࡟㔞Ꮚ⛉Ꮫ◊✲㛤Ⓨᶵᵓ 㧗ᓮ㔞Ꮚᛂ⏝◊࣮࣒ࣛ࢖ࣥ࡜ẚ㍑ࡋࠊ1000 ಸ௨ୖࡢ࣑࣮ࣗ࢜ࣥ

✲ᡤࡢࢫࢱࢵࣇ࡟ࡣࠊ࣐࢞ࣥ⥺↷ᑕࡢ㝿࡟ᵝࠎ࡞ࢆᘬࡁฟࡍࡇ࡜ࡀ࡛ࡁࡿࠋࡋ࠿ࡋࠊࡑࡢᵓ㐀࡟㉳౽ᐅࢆᅗࡗ࡚㡬࠸ࡓࠋࡲࡓࠊᮾ໭኱Ꮫ㔠ᒓᮦᩱ◊ᅉࡋ࡚ࠊ㉸ఏᑟ☢▼ࡣࠊᶆⓗ࡜ࢥ࢖ࣝࡢ㛫࡟㧗ᐦ✲ᡤᮦᩱ⛉Ꮫᅜ㝿◊✲ࢭࣥࢱ࣮ࡢࢫࢱࢵࣇ࡟ࡣࠊ

ᗘࡢᨺᑕ⥺ࢩ࣮ࣝࢻࢆ㓄⨨ࡋ࡚ࡶࠊ㧗ᨺᑕ⥺⎔ቃ୰ᛶ↷ᑕ࡟㛵ࡍࡿᵝࠎ࡞ᡭ⥆ࡁࡸసᴗࡔࡅ࡛ࡣ

ୗ࡛ࡢ㐠⏝ࢆᙉ࠸ࡽࢀࡿࡓࡵࠊᨺᑕ⥺࡟ࡼࡿᙳ㡪࡞ࡃࠊ ᐃ࡟㛵ࡍࡿ⿵ຓࡶࡸࡗ࡚㡬࠸ࡓࠋࡇࡇ࡟

ࢆ᭱ᑠ໬ࡋࠊ┠ᶆ⥺㔞࡟⪏࠼࠺ࡿタィࢆࡍࡿᚲせ῝ࡃឤㅰࡢពࢆ⾲ࡋࡓ࠸ࠋࡀ࠶ࡿࠋ

12㸫 21㡪࡟㛵ࡍࡿ◊✲ࠖࠊ༤ኈᏛ఩ㄽᩥࠊ஑ᕞ኱Ꮫࠊ
2017 ᖺཧ ⪃ ᩥ ⊩
[1] The COMET Collaboration, Prog. Theor. Exp.
Phys. vol.2020, no.3, p.033C01 (2020)[2] Y. Kuno and Y.Okada, Rev. Mod. Phys. ,
pp.151-202 (2001).
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[8] Ye Yang, et al., “Study of irradiation effects onthermal characteristics for COMET pion capturesolenoid ,” IEEE Trans. Appl. Supercond., vol. 28,
no. 3, Apr. 2018, Art. ID. 4001405[9] Y. Yang, et al., “Influence of gamma ray irradiationon thermal conductivity of bismaleimide-triazinebased insulation tape at cryogenic temperature,”&U\RJHQLFV 89 107-112 (2018).
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[12] 㔝⏣ᑦ᫛ࠊ௚ࠕ␗✀᥋ྜᮦࡢᮦᩱຊᏛ࡜ᛂຊ
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