2A-a01NMRᮦᩱ㛤Ⓨ䛻ྥ䛡䛯㉸㧗ឤᗘᅛయ NMR 䝥䝻䞊䝤䛾㛤Ⓨ䡚䝍䜲䝲䝂䝮୰䛾◲㯤ᯫᶫᵓ㐀ゎ᫂䜢┠ᣦ䛧䛶䡚㻰㼑㼢㼑㼘㼛㼜㼙㼑㼚㼠㻌㼛㼒㻌㻴㼕㼓㼔㻙㼟㼑㼚㼟㼕㼠㼕㼢㼑㻌㻿㼛㼘㼕㼐㻙㼟㼠㼍㼠㼑㻌㻺㻹㻾㻌㻼㼞㼛㼎㼑㻌㼒㼛㼞㻌㻹㼍㼠㼑㼞㼕㼍㼘㼟㻌㻿㼏㼕㼑㼚㼏㼑㻦㻌㼀㼛㼣㼍㼞㼐㻌㻯㼘㼍㼞㼕㼒㼕㼏㼍㼠㼕㼛㼚㻌㼛㼒㻌㻾㼡㼎㼎㼑㼞㻌㼂㼡㼘㼏㼍㼚㼕㼦㼍㼠㼕㼛㼚㻌㻹㼑㼏㼔㼍㼚㼕㼟㼙㻌㼣㼕㼠㼔㻌㻿㼡㼘㼒㼡㼞㻌㧗ᶫ 㞞ே㸦⌮◊㸧; ࢺࣜࢺ࣮ࣛ࢝ࣥ ࢸࢩࢵࢺ, ຍ⸨ ⩧ኴ, ᒸᮧ ဴ⮳㸦ᮾᕤ኱㸧;ධỤ ᫭ኴᮁ, ᫍ ᬕ㈗, 㰺⸨ ᩔ㸦ᒣᙧ኱㸧; ᒣ⏣ ࿴ᙪ㸦㧗▱኱㸧
TAKAHASHI Masato(RIKEN); TRITRAKARN Techit, KATO Shota, OKAMURA Tetsuji(Tokyo Tech);
IRIE Kotaro, HOSHI Haruki, SAITO Atsushi(Yamagata Univ.); YAMADA Kazuhiko(Kochi Univ.)
E-mail: masato.takahashi@riken.jp㻝䠊䛿䛨䜑䛻㻌ࡼࡾ㧗ᶵ⬟࣭㧗ᛶ⬟࡞ᮦᩱ㛤Ⓨ࡟㈉⊩ࡍࡿࡓࡵ࡟ࠊJSTඛ➃ィ ศᯒᢏ⾡࣭ᶵჾ㛤Ⓨࣉࣟࢢ࣒ࣛࠕ඲ཎᏊࢆ ᐃᑐ㇟࡜ࡍࡿḟୡ௦ᆺ NMR ⿦⨨ࡢ㛤Ⓨࠖ㸦ࢳ࣮࣒࣮ࣜࢲ࣮㸸㧗▱኱Ꮫ ᒣ⏣࿴ᙪ㸧ࢆ⾜ࡗ࡚࠸ࡿࠋᐇ⏝ᮦᩱ୰ᅄᴟᏊ᰾ࡢ⤖ྜ≧ែࡸືⓗᣲືࢆ ᐃࡍࡿ NMR ⿦⨨ࢆ㛤Ⓨࡋࠊ⌧ᅾ࡛ࡶᮍゎ᫂࡞ࢱ࢖ࣖ࡞࡝ࢦ࣒୰ࡢ◲㯤㸦33S㸧࡟ࡼࡿᯫᶫᵓ㐀ࢆゎ᫂ࡍࡿࡇ࡜ࢆ┠ᶆ࡜ࡋ࡚࠸ࡿ(Fig. 1)ࠋ
㏆ᖺᛴ㏿࡟Ⓨ㐩ࡋ࡚࠸ࡿᅛయ NMR ࡣᮦᩱ㛤Ⓨࡸࣛ࢖ࣇࢧ࢖࢚ࣥࢫ࡟౑ࢃࢀࡘࡘ࠶ࡾࠊ௚ࡢほ ⿦⨨࡛ࡣ ᐃ୙ྍ⬟࡞࢔ࣔࣝࣇ࢓ࢫ≧ែ࡛ࡶ╔┠ཎᏊ᰾࠿ࡽ┤᥋ⓗ࡟᝟ሗࢆᚓࡿࡇ࡜ࡀྍ⬟࡛࠶ࡿࠋࡋ࠿ࡋࠊᅄᴟᏊ᰾ࡢሙྜ
NMR ࢫ࣌ࢡࢺࣝࡣ㠀ᖖ࡟ᖜᗈ࡟࡞ࡿࡇ࡜ࡀከࡃࠊᚑ᮶ࡢ
NMR ⿦⨨࡛ࡣ ᐃ࡛ࡁ࡞࠸ࠋᚑ᮶࡜ࡣ඲ࡃ␗࡞ࡿ㉸㧗ឤᗘ࡞㧗 ㉸ఏᑟ㸦HTS㸧ཷಙ࢔ࣥࢸࢼ㸦ࢥ࢖ࣝ㸧࡜☢ሙᤲᘬᆺ㉸ఏᑟ☢▼ࢆഛ࠼ࡓ NMR ⿦⨨ࢆ㛤Ⓨ୰࡛࠶ࡿࠋ㻞䠊䝥䝻䝆䜵䜽䝖⤂௓㻌ୖグඛ➃ィ ࣉࣟࢪ࢙ࢡࢺࡣ 3 ࡘࡢせ⣲࠿ࡽᡂࡿࠋHTSཷಙࢥ࢖ࣝ㸦LC ඹ᣺ᅇ㊰ࡢ L ࢆ㧗ᛶ⬟໬㸧ࠊ࢜ࣉࢺ࣓࢝
ࢽࢡࢫ㸦C ࢆ㧗ᛶ⬟໬㸧ࠊ☢ሙᤲᘬ NMR ࡢᡭἲ㛤Ⓨ࡛࠶ࡿࠋ࢜ࣉࢺ࣓࢝ࢽࢡࢫ࡛ࡣࠊඹ᣺ᅇ㊰ࡢࢥࣥࢹࣥࢧࡢ㟁ᴟࢆ᣺ື⭷࡟ࡋ࡚඘ᨺ㟁ࢆ࣮ࣞࢨ࣮࡛ㄞࡳྲྀࡿ NMRಙྕ ᐃἲࢆி㒔኱ᏛࡢṊ⏣ࢆ୰ᚰ࡟㛤Ⓨ୰࡛࠶ࡿ[1]ࠋ
☢ሙᤲᘬ NMR ࡣ㧗▱኱Ꮫࡢᒣ⏣ࡀ࣮ࣘࢨ࣮どⅬ࡛ᐇᮦᩱ࡟㐺ࡋࡓ ᐃἲࢆ㛤Ⓨ୰࡛࠶ࡿ[2]ࠋ㻟䠊ᐇ⏝ᮦᩱ䛻䛚䛡䜛ᅄᴟᏊ᰾ 㻺㻹㻾 䛾ឤᗘ㻌ᐇ⏝ᮦᩱࠊࡓ࡜࠼ࡤඹ᭷⤖ྜᛶࢆ᭷ࡍࡿ᭷ᶵ◲㯤໬ྜ≀ࡸࢦ࣒ࢆྵࡴ㧗ศᏊヨᩱࡢሙྜࠊ33S ࡢᅄᴟᏊ࣮࣓ࣔࣥ
ࢺ࡟ࡼࡗ࡚ NMR ࢫ࣌ࢡࢺࣝࡢ⥺ᖜࡀᩘ༑ MHz ࡟࡞ࡿࠋࡇࢀࡣࠊᅄᴟᏊ┦஫స⏝ࡢᙉࡉ㸦ୖグᩘ༑ MHz㸧࡜ࢮ࣮࣐ࣥ┦஫స⏝ࡢᙉࡉ㸦33S ࡢ NMR ඹ㬆࿘Ἴᩘࠊࡓ࡜࠼ࡤ
500 MHz(11.74 T)ࡢ NMR ⿦⨨࡛ 38.4 MHz㸧ࡀ࡯ࡰྠࡌ࡜࠸࠺ࡇ࡜࡟࡞ࡿࠋࡇࡢሙྜࠊ୧⪅ࡀΰྜࡋ࡚」㞧࡞ᩘ༑ MHz ࡟ཬࡪᗈᖜࡢ NMR ࢫ࣌ࢡࢺࣝࡀ⥔ᣢࡉࢀࡿࡓ
ࡵᗈᖜࡍࡂ࡚㏻ᖖࡣ ᐃ࡛ࡁ࡞࠸㸦ᶓࡢၥ㢟㸧ࠋࡉࡽ࡟ࠊ
NMR ಙྕࢆฟࡍ 33S ࡢኳ↛Ꮡᅾẚࡀ 0.75%㸦99.25%Ꮡ

ᅾࡍࡿ 32S ࡣ NMR ಙྕࢆฟࡉ࡞࠸㸧࡛࠶ࡿࡓࡵࡼࡾᅔ㞴࡞ ᐃ࡜࡞ࡿ㸦⦪ࡢၥ㢟㸧ࠋࡘࡲࡾ NMR ᐃࡢ㞴᫆ᗘࡣࠊ⥺ᖜ㸦ᶓ㸧࡜ಙྕᙉᗘ㸦⦪㸧ࡢၥ㢟࡛Ỵࡲࡿࠋ
NMR ࡣపឤᗘ࡞ ᐃᡭἲ࡛࠶ࡾྠࡌ ᐃࢆఱ୓ᅇࡶ
✚⟬ࡍࡿࡀࠊS/N ẚࡣ✚⟬ᅇᩘࡢ 1/2 ஌࡟ẚ౛ࡍࡿࠋ1 ⛊ࡢ ᐃࢆ 10,000 ᅇ✚⟬㸦2.8 ᫬㛫㸧ࡋࡓ NMR ಙྕࡀࠊୖグࡢᗈᖜ໬࡜పᐦᗘ໬࡟ࡼࡾ 1/100 ࡢಙྕᙉᗘ࡟࡞ࡗࡓ ࡜ ௬ ᐃ ࡍ ࡿ ࠋ ࡇ ࢀ ࢆ ⿵ ࠺ ࡟ ࡣ 10,000 ಸ ✚ ⟬㸦10,000*10,000 ᅇ㸧ࠊࡘࡲࡾ 1157 ᪥ᚲせ࡜࡞ࡿࡓࡵࠊྠࡌ ᐃ⿦⨨࡛ࡣ஦ᐇୖ ᐃ୙ྍ⬟࡛࠶ࡿࠋ㻠䠊ᐇ㦂⿦⨨㻌
HTS ཷಙࢥ࢖ࣝ࡟ࡼࡿ㉸㧗ឤᗘ໬࡛⦪ࡢၥ㢟ࢆゎỴࡋࠊ☢ሙᤲᘬᆺ㉸ఏᑟ☢▼ࢆ⏝࠸ࡓ᪂つ ᐃᡭἲ࡟ࡼࡾᶓࡢၥ㢟ࢆゎỴࡍࡿࠋHTS ཷಙࢥ࢖ࣝࡣࠊ㉸㧗ឤᗘࢆᐇ⌧࡛ࡁࡿࡶࡢࡢ࿘Ἴᩘࡢㄪᩚࡀ୙ྍ⬟࡛࠶ࡿࡓࡵࠊ☢ሙᤲᘬᆺ㉸ఏᑟ☢▼࡜⤌ࡳྜࢃࡏࡿࡇ࡜ࡀࡑࡢᛶ⬟ࢆ᭷ຠά⏝࡛ࡁࡿ၏୍ࡢ᪉ἲ࡛࠶ࡿࠋ⏝࠸ࡓ HTS ཷಙࢥ࢖ࣝࡣREBCO ⷧ⭷ࢆ⏝࠸ࡓ 25 mm ゅࡢᇶᯈᆺ࡛࠶ࡾᒣᙧ኱Ꮫࡢ㰺⸨ࡀ〇సࡋࡓ[3]ࠋ☢ሙᤲᘬᆺ㉸ఏᑟ☢▼ࡣࠊோᮌᕤⱁᰴᘧ఍♫ࡢ 8 T ఏᑟ෭༷ᆺ㧗ᆒ୍ᗘ࣐ࢢࢿࢵࢺ㸦ᐊ
࣎࢔ᚄ 54 mm㸧ࢆ⏝࠸ࡓࠋࡇࡢ☢▼ࡣࠊࢭࣝࣇࢩ࣒ᶵ⬟࡟ࡼࡾࠊ☢ሙᤲᘬ୰࡛ࡶࢩ࣒ㄪᩚࡍࡿࡇ࡜࡞ࡃ㧗࠸☢ሙᆒ୍ᗘ㸦10 ppm@10 mm ⌫㸧ࢆ⥔ᣢ࡛ࡁࡿࡓࡵࠊᮏᡭἲ࡟᭱㐺࡛࠶ࡿࠋ㻡䠊ᐇ㦂⤖ᯝ㻌☢ሙᤲᘬ NMR ࡣ㧗▱኱Ꮫ࡛ࠊHTS ཷಙࢥ࢖ࣝࡣᒣᙧ኱Ꮫ࡜⌮◊ᶓ὾࡛ࠊูಶ࡟㛤Ⓨࢆ㐍ࡵ࡚࠾ࡾࠊࣉࣟࢪ࢙
ࢡࢺ᭱⤊ᖺᗘ࡛࠶ࡿᮏᖺᗘ࡟ࡍ࡭࡚ࢆ⼥ྜࡍࡿࠋࡇࢀࡲ
࡛࡟ࠊᨃఝ NMR ಙྕࢆ⏝࠸࡚ HTS ཷಙࢥ࢖ࣝࡢឤᗘࡀࠊᐊ 㖡ࢥ࢖ࣝ࡟ẚ࡭⣙ 7 ಸࡢྥୖ㸦✚⟬᫬㛫 1/50㸧ࡋ࡚࠸ࡿࡇ࡜ࢆ☜ㄆࡋࡓࠋヲ⣽ࡣᙜ᪥ሗ࿌ࡍࡿࠋཧ⪃ᩥ⊩㻌
1. K. Takeda, et al.: "Electro-mechano-optical NMRdetection", arXiv:1706.00532 [quant-ph]
2. K. Yamada, et al.: Chem. Phys. Lett., 618 (2015) 20
3. Saito, et al.: 13th European Conference on Applied
Superconductivity (2017), 3EP1 20ᄬ‫ ↺↷ࡽੈئ‬ɭမИ↝ย‫ܭ‬ኽௐย‫ܭ‬ኽௐឬ࠼ࠢ⇟∀⇕⇮∑⊡್↝բ᫆⇁ᚐൿ⊡᭗ภឬˡ‫ݰ‬Ӗ̮⇙⇊∑↚↷↺ឬ᭗ज़ࡇ҄⊡ጏ↝բ᫆⇁ᚐൿ⊡ήӳ঺≋⇕∓∓⇻⇉∑≌↚ⅹↀ↺∄⇖⇳⇝⇌∆↝ೞᏡᚐଢμΨእ↝ⅵ← •‗ⅻׄಊ‫܇‬ఋ≋᰾ᑥ≌μᚐௌ୺ዴ≢≢ᄊᭌኬᏘᭌᑻኬᏘᭌԈӓᭌ࢟঺⇑∑⇝⇌∆↚↷↺⇚∆ɶ↝ᄑ᰾↚↷↺௚೛ನᡯᭌˊᜓ↝ᡙួܴภ᤾⇙⇊∑᧏ႆɶ↝᭗ภឬˡ‫⇽ ݰ‬∓∞⇼Ӗ̮⇙⇊∑∃∐⇎⇧−∙ӳ঺↝લ˩⁀‿⁄̮ӭ↚↷↺ኽௐ⅛ኖ ̿ज़ࡇӼɥ⇧∞⇖∏∞∝⇰⇩⇥ᚑ‫ۥ‬≋⇧⇥∙⅚⇞∑⇙⇱⇌∆≌ ʻࢸ⅚ᚾ૰ภࡇӧ‫٭‬২ᘐ↗↝ᗡӳ

Fig.1 Target materials of our development⁍ ⁅⁏⁓‟⁅‪‚ᄑ᰾Ҿ‫↝‛܇‬ᄬ‫׹ࡽੈئ‬ᄑ᰾ᄬ‫‿⁀ࡽੈئ‬⁄ ⁀‿⁄⇟∀⇕⇮∑‥‥

K. Yamada et al. Chem. Phys. Lett., 618 (2015) 20

Fig.2 Developing NMR methods for quadrupolar nuclei― 94 ―

第95回

2017年度秋季低温工学・超電導学会

2A-a02

NMRᮦᩱ㛤Ⓨ䛻ྥ䛡䛯㉸㧗ឤᗘᅛయ NMR 䝥䝻䞊䝤䛾㛤Ⓨ㻌䡚HTS 䜢⏝䛔䛯 RF 䝁䜲䝹䛻䜘䜛ᛶ⬟ྥୖ䡚㻌
Development of High-sensitive Solid-state NMR Probe for Materials Science㹼HTS RF Coil to Receive Weak NMR Signals㹼ຍ⸨⩧ኴࢺࣜࢺ࣮ࣛ࢝ࣥࢸࢩࢵࢺ ᮾᕤ኱ 㧗ᶫ㞞ே ⌮◊ ධỤ᫭ኴᮁᫍᬕ㈗㰺⸨ᩔ ᒣᙧ኱ ᒣ⏣࿴ᙪ 㧗▱኱ ᒸᮧဴ⮳ ᮾᕤ኱ 
KATO Shota, TRITRAKARN Techit(Tokyo Tech); TAKAHASHI Masato(RIKEN); IRIE Kotaro, HOSHI Haruki,SAITO Atsushi(Yamagata Univ.); YAMADA Kazuhiko(Kochi Univ.); OKAMURA Tetsuji(Tokyo Tech)
Email: katou.s.ac@m.titech.ac.jp ᐇ㦂⤖ᯝ࡜⪃ᐹ Fig. 3 ࡟ྛࢥ࢖ࣝࡢ࿘Ἴᩘ≉ᛶࡢ ᐃ⤖ᯝࢆ♧ࡍࠋ෭༷ᵓ㐀㒊ᮦࡀ 51 K ࡟࠾ࡅࡿ HTS ࢥ࢖ࣝࡢ Q ್ࡀ⣙ 5000࡜࡞ࡗࡓࠋ㖡ࢥ࢖ࣝࡢ Q ್ࡣᐊ ࡛⣙ 100ࠊ෭༷ᵓ㐀㒊ᮦࡀ 53 K ࡢ᫬⣙ 270 ࡜࡞ࡗࡓࠋNMR ᐃࡢឤᗘࡣඥ࡟RF coil unit
Cooling stage: He (Thermal shield): He (To cooling stage)

Fig. 1: NMR probe cooling system

HTS coilFig. 2: HTS RF coil on cooling structure (horizontal)
00-10-10

Magnitude [dB] +76 ࢥ࢖ࣝ෭༷ᵓ㐀ࠊᐇ㦂᪉ἲ HTS ࢆ RF ࢥ࢖ࣝ࡜ࡋ࡚⏝࠸ࡿሙྜࠊ෭༷ᛶ⬟࡜㧗࿘Ἴඹ᣺ჾ࡜ࡋ࡚ࡢᛶ⬟ࢆ୧❧ࡉࡏࡿ෭༷ᵓ㐀ࡀᚲせ࡛࠶ࡿࠋFig. 1 ࡟ᡃࠎࡀ㛤Ⓨࡋࡓ NMR ᴟప ࣉ࣮ࣟࣈࡢࢩࢫࢸ࣒ᅗࢆ♧ࡍࠋ㉸ఏᑟ࣐ࢢࢿࢵࢺ࡬ࡢᤄධ㒊࡟ࡣᴟపࡢ HTS ࢥ࢖ࣝ࡜ࢧࣥࣉࣝࡀタ⨨ࡉࢀࡿࡀࠊᑍἲୖࡢไ⣙࠿ࡽ୧⪅ࡢ㊥㞳ࡀᩘ mm ࡜࡞ࡗ࡚ࡋࡲ࠺ࠋࡇࢀ࡟ࡼࡗ࡚ࢧࣥࣉࣝࡀᐊ ࡢሙྜ࡟୧⪅࡛⇕஺᥮ࡍࡿࡇ࡜ࡀ᝿ᐃࡉࢀࡿࠋࡋࡓࡀࡗ࡚ࡑࡢ㝿ࡢ⇕஺᥮㔞ࢆపῶࡍࡿࡓࡵࣉ࣮ࣟࣈෆ㒊ࡣ┿✵ᘬࡁࡍࡿࡇ࡜࡜ࡋࡓࠋࡲࡓࠊHTS ࢥ࢖ࣝ࡜ࢧࣥࣉࣝ㛫ࡣ᩿⇕ࡋ࡚ HTS ࢥ࢖ࣝࡢࡳࢆ෭༷ྍ⬟࡞ᵓ㐀ࢆ㛤Ⓨࡋࡓ㸦Fig. 2㸧ࠋ୍᪉࡛ HTS ࢥ࢖ࣝࡣ㏻ᖖࡢ RF ࢥ࢖ࣝ࡜ẚ㍑ࡋ࡚ Q್ࡀ㠀ᖖ࡟㧗ࡃ࡞ࡿࡇ࡜ࡀ᝿ᐃࡉࢀࡿࠋQ ್࡜ࡣࠊࢥ࢖ࣝ࡟⵳✚ࡉࢀࡿ☢ሙ࢚ࢿࣝࢠ࣮ࢆ᢬ᢠࡸㄏ㟁ᦆኻ࡞࡝࡛ᦆኻࡍࡿ࢚ࢿࣝࢠ࣮࡛๭ࡗࡓ್࡛࠶ࡿࠋࡇࡢ್ࡀ኱ࡁ࠸࡯࡝㧗ᛶ⬟࡞ࣉ࣮ࣟࣈ࡛࠶ࡿࡇ࡜ࢆ♧ࡍࠋࡋࡓࡀࡗ࡚ࢥ࢖ࣝ෭༷㒊ᮦࡢᙧ≧࡟ࡼࡗ࡚ࡣᑟయࡢ 㟁ὶᦆࡸㄏ㟁యࡢㄏ㟁ᦆ࡟ࡼࡿ Q ್పୗࡀ㢧ⴭ࡟⾲ࢀࡿྍ⬟ᛶࡀ࠶ࡿࠋࡼࡗ࡚ࡇࢀࡽࡢᙳ㡪ࢆᐃᛶⓗ࡟ホ౯ࡍࡿࡓࡵࠊᒣᙧ኱࡜
ඹྠ࡛㟁☢⏺ゎᯒࢆ⾜ࡗࡓࠋࡇࢀ࡟ࡼࡗ࡚ࢥ࢖ࣝ෭༷ᵓ㐀ࡣ෭༷ᛶ࡜ࠊHTS ࢥ࢖ࣝࡢ㧗࠸ Q ್ࢆ୧❧ྍ⬟࡞タィ࡜ࡋ࡚࠶ࡿࠋ ࡇࡢ෭༷ᵓ㐀㒊ᮦ࡟ࠊྠࡌࡃᒣᙧ኱ࡀస〇ࡋࡓᇶᯈᆺࡢ HTS ࢥ࢖ࣝ[1]ࢆタ⨨ࡋࠊ෭༷ࢫࢸ࣮ࢪ࡟ᅛᐃࡋ࡚෭༷ࢆ⾜ࡗࡓࠋ௒ᅇࡣ NMR ᐃ࡟ඛ❧ࡕࠊࢿࢵࢺ࣮࣡ࢡ࢔ࢼࣛ࢖ࢨ࡟ࡼࡗ࡚෭༷ࡋࡓࢥ࢖ࣝࡢ࿘Ἴᩘ≉ᛶࢆィࡍࡿࡇ࡜࡟ࡼࡗ࡚ࢥ࢖ࣝࡢᛶ⬟ࢆぢ✚ࡶࡗࡓࠋࡲࡓࠊẚ㍑࡜ࡋ࡚ HTS ࢥ࢖ࣝ࡜ྠᙧ≧ࡢ㖡ࢥ࢖ࣝࢆ⏝࠸ࡓᐇ㦂ࡶ⾜ࡗࡓࠋẚ౛ࡍࡿࡇ࡜ࡀ▱ࡽࢀ࡚࠸ࡿࡓࡵࠊHTS ࢥ࢖ࣝࡢឤᗘࡣᐊ ࡢ㖡ࢥ࢖ࣝࡢ⣙ 7 ಸ࡜࡞ࡿࡇ࡜ࡀぢ✚ࡶࡽࢀࡿࠋ୍᪉㖡ࢥ࢖࡛ࣝࡣ෭༷ࡋࡓ㝿ࡢឤᗘྥୖࡣ⣙ 1.6 ಸ࡜ぢ✚ࡶࡿࡇ࡜ࡀ࡛ࡁࡿࠋࡼࡗ࡚ᐇ㝿ࡢ NMR ᐃ࡟࠾࠸࡚ࠊHTSࢥ࢖ࣝࢆ⏝࠸ࡿࡇ࡜࡛኱ࡁࡃឤᗘྥୖࡍࡿࡇ࡜ࡀぢ㎸ࡲࢀࡿࠋ ⌧ᅾࡣ HTS ࢥ࢖ࣝ࡟ࡼࡿឤᗘྥୖࢆᐇドࡍ࡭ࡃ NMRᐃ࡟ྥࡅ࡚ྲྀࡾ⤌ࢇ࡛࠸ࡿ࡜ࡇࢁ࡛࠶ࡿࠋᙜ᪥ࡢⓎ⾲࡛ࡣ᭱᪂ࡢ⤖ᯝࡶྵࡵ࡚ሗ࿌ࡍࡿணᐃ࡛࠶ࡿࠋ

Magnitude [dB] ࡣࡌࡵ࡟ ᅛయ᰾☢Ẽඹ㬆㸦NMR㸧ἲࡣᮦᩱ㛤Ⓨࡸ⏕࿨⛉Ꮫࡢศ㔝࡛ỗ⏝ⓗ࡟⏝࠸ࡽࢀࡿศᯒ⿦⨨࡛࠶ࡿࠋᮏᡭἲࡣࠊ௚ࡢศᯒ⿦⨨࡛ࡣ ᐃ୙ྍ⬟࡞࢔ࣔࣝࣇ࢓ࢫ≧ែ࡟࠾࠸࡚ࡶᑐ㇟ཎᏊࡢ⤖ྜ≧ែࢆᢕᥱࡍࡿࡇ࡜ࡀྍ⬟࡛࠶ࡿࠋ࿘ᮇ⾲ୖࡢ 8 ๭௨ୖࡢඖ⣲ࡀᅄᴟᏊ᰾ࢆྵࢇ࡛࠾ࡾࠊᐇ⏝ᮦᩱࡢᅛయ NMR ࢫ࣌ࢡࢺࣝࡣᅄᴟᏊ┦஫స⏝ࡢᙳ㡪ࢆཷࡅ㠀ᖖ࡟ᖜᗈ࡜࡞ࡿሙྜࡀከ࠸ࠋࡑࡢ⤖ᯝࠊNMR ಙྕᙉᗘࡀᚤᙅ࡜࡞ࡿࡓࡵᚑ᮶ࡢ NMR ⿦⨨࡛ࡣ ᐃࡀᅔ㞴࡜࡞ࡿࠋࡑࡇ࡛ᮏ◊✲࡛ࡣᅛయ NMR ࣉ࣮ࣟࣈࡢ㉸㧗ឤᗘ໬ࢆ┠ᣦࡋ࡚ࠊNMR ಙྕཷಙ㒊࡟㧗 ㉸ఏᑟ㸦HTS㸧ⷧ⭷ࢆ⏝࠸ࡓ࢔ࣥࢸࢼ㸦RF ࢥ࢖ࣝ㸧ࢆ᥇⏝ࡋࡓࠋ

-20-30-4030

Cu coil (300K)
3132

33

Frequency [MHz]34-20-30-40
39.25

HTS coil
Q 500039.3

39.35

Frequency [MHz]39.4

Fig. 3: Frequency response (S11) of RF coilཧ⪃ᩥ⊩
㹙1㹛 A. Saito, et al.: 13th European Conference on
Applied Superconductivity (2017), 3EP1 - 20― 95 ―

第95回

2017年度秋季低温工学・超電導学会

2A-a03NMR㉸㟁ᑟ᥋ྜ䜢⏝䛔䛯Ọஂ㟁ὶ 㻝㻚㻟㻌㻳㻴㼦㻌㻺㻹㻾 䛻ྥ䛡䛶䠄䠍䠅㻌䡚☢▼䛾ᴫᛕタィ䛸せ⣲ᢏ⾡㛤Ⓨ䡚㻌

Towards a persistent current 1.3 GHz NMR using superconducting joints (1)䇵 Conceptual design and technical development of the magnet 䇵ᰗ⃝ ྜྷ⣖䠄⌮◊䠅䠗ᩧ⸨ ୍ຌ䠈℈⏣㻌 ⾫䠄JASTEC䠅䠗すᓥ ඖ䠈໭ཱྀ ோ䠈ᯇᮏ ┿἞䠈㔝ཱྀ 㝯ᚿ䠄NIMS䠅䠗᳜⏣ ᾈྐ䠄ᒸᒣ኱䠅䠗Ọ▼ ❳㉳䠄ఫ཭㟁ᕤ䠅䠗ᮔ ௵୰䠈㧗ᶫ 㞞ே䠈๓⏣ ⚽᫂䠄⌮◊䠅YANAGISAWA Yoshinori (RIKEN) ; SAITO Kazuyoshi, HAMADA Mamoru (JASTEC) ; NISHIJIMA Gen, KITAGUCHI Hitoshi,
MATSUMOTO Shinji, NOGUCHI Takashi (NIMS) ; UEDA Hiroshi (Okayama Univ.) ; NAGAISHI Tatsuoki (SEI) ;PIAO Renzhong, TAKAHASHI Masato, MAEDA Hideaki (RIKEN)
E-mail: yoshinori.yanagisawa@riken.jp㻌㻝㻚㻌 䛿䛨䜑䛻㻌ཧ⪃ᩥ⊩
1 GHz (23.5 T)䜢኱䛝䛟ୖᅇ䜛㉸㧗☢ሙ䛾㧗ศゎ⬟ NMR[1] ᳜⏣௚䠈2017 ᖺᗘ⛅Ꮨప ᕤᏛ㉸ఏᑟᏛ఍䠈1B-a02
䛿䚸⚄⤒ኚᛶ⑌ᝈ䛷䛒䜛䜰䝹䝒䝝䜲䝬䞊⑓䛻㛵䜟䜛⬻ෆ䛾䜰
[2] Suetomi et al. SuST 29 (2016) 105002
䝭䝻䜲䝗 ȕ 䝍䞁䝟䜽㉁䛾◊✲䜢㣕㌍ⓗ䛻㐍ᒎ䛥䛫䜛䝒䞊䝹䛸䛧䛶䚸[3] ᮎᐩ௚䠈2017 ᖺᗘ⛅Ꮨప ᕤᏛ㉸ఏᑟᏛ఍䠈1A-p03
㛤Ⓨ䛜ᙉ䛟ồ䜑䜙䜜䛶䛔䜛䚹ᡃ䚻䛿䚸ୡ⏺ⓗ䛻ᐇ⌧䛧䛶䛔䛺[4] Ohki et al. SuST 30 (2017) 115017
䛔 1.3 GHz (30.5 T) LTS/HTS NMR 䛻䛴䛔䛶䚸ᴫᛕタィ䛸せ㻌⣲ᢏ⾡㛤Ⓨ䜢ጞ䜑䛶䛔䜛䚹ྲྀ䜚ᢅ䛔䛾ᐜ᫆䛥䜔ప☢ሙᶵ䜈䛾
Table 1 Parameters of 1.3 GHz (30.5 T) LTS/HTS NMRᣑᙇᛶ䜢⪃៖䛧䚸Ọஂ㟁ὶ㐠㌿䜢┠ᣦ䛩䚹ᮏሗ䛷䛿䚸☢▼䛾magnet designs➨୍ḟᇶᮏタィ䛾ᛮ᝿䛸せ⣲ᢏ⾡㛤Ⓨ䛾㐍ᤖ䜢ሗ࿌䛩䜛䚹㻌
Design A Design B㻞㻚㻌 タィ䛾≉ᚩ㻌
Field contribution: LTS
6.43
7.86
㻌 Table 1 䛻☢▼䛾➨୍ḟᇶᮏタィ䛾୺せ䝟䝷䝯䞊䝍䜢♧䛩䚹: Bi-2223
16.9
23.0㉸㧗☢ሙ☢▼䛸䛧䛶䛾タィ䛾≉ᚩ䛿௨ୗ䛾㏻䜚䛷䛒䜛䚹: REBCO
7.55
1) ☢▼䛾䝃䜲䝈䜢䝁䞁䝟䜽䝖䛻ᢚ䛘䜛䛯䜑䛻 HTS 䝁䜲䝹䛾☢
Operatingcurrent(A)183.6176.9ሙ㓄ศ䜢㧗䛟タᐃ䠄>23 T䠅Self inductance (H)1091
19742) Ọஂ㟁ὶ㐠㌿䛸ᆒ୍☢ሙ䜢ᐇ⌧䛩䜛䛯䜑䛾䝺䜲䝲䞊ᕳ
HTS 䝁䜲䝹䛾᥇⏝Stored energy (MJ)
18.4
30.93) ຎ໬䛸㐽ⶸ㟁ὶ☢ሙ䛾ᢚไ䛾ほⅬ䛛䜙䚸Bi-2223 䜢ከ䛟౑Total weight of superconductors (ton)
2.48
5.52
䛔䚸REBCO 䛿᭱ෆᒙ䛻䛾䜏౑⏝䠄Design A䠅
TotalHTSconductor
length(km)
69.9
84.7
㻌
5 G line from the center (m)88㻟㻚㻌 せ⣲ᢏ⾡㛤Ⓨ㻌ㅰ㎡䠖☢▼䛾タィ䛿ᩥ⛉┬䛾ඛ➃◊✲ᇶ┙ඹ⏝ಁ㐍஦ᴗ䛾ጤク䛾୍⎔䛷ᐇ᪋䛥䜜䛯䚹せ⣲ᢏ⾡㛤Ⓨ䛾୍㒊䛿 JST S-䜲䝜䝧䛻䜘䛳䛶⾜䜟䜜䛯䚹

450350300(b) 450

Straight

250
BJRcenter

200

Straight

400>49MPa6040 mm 335MPamm

Stress (MPa)Stress (MPa)40060mm

350300>116MPa40250 mm200

BJRend150150
10001000100200
Radius (mm)100200Radius (mm)Fig.1 Comparison of BJR of the Bi-2223 coils in design A(solid lines) and stress at 99% Ic recovery of conductor/joint at
77 K (the open triangles and dashed lines). (a) Coil center. (b)Coil ends.

Fig. 2 Cross-section of a polyimide electrodeposited Bi-2223
conductor
n value=250200

I-200-300
0183.39A(1.3GHz)

0-20-40-60-80-3

Driftrate:
1000.009ppm/hat20thday

Z2:
Ͳ8.4ppm/cm2-2-10z (cm)

Bs

123

1020Time (day)Current, I (A)-100

B(z)-B(z=0) (ppm)

Screening current-induced field, Bs (ppm)㻟㻚㻝㻌 Ọஂ㟁ὶ㐠㌿䛻ྥ䛡䛯㉸㟁ᑟ᥋ྜ䛾㛤Ⓨ㻌㻌 ඲ 䝁 䜲 䝹 ┤ ิ 䛾 Ọ ஂ 㟁 ὶ 㐠 ㌿ 䛻 䛿 䚸 HTS-HTS 䛚 䜘 䜃HTS-LTS 䛾㉸㟁ᑟ᥋ྜᢏ⾡䜢㛤Ⓨ䛧䚸ᅇ㊰᢬ᢠ䛾ྜィ್䜢
0.1 nȍ 䝺䝧䝹䛻ᢚ䛘䜛ᚲせ䛜䛒䜛䚹REBCO ⥺ᮦྠኈ䛾㉸㟁ᑟ᥋ྜ[4]䜢⏝䛔䛯 NMR ෆᒙ䝰䝕䝹䝁䜲䝹䛾㛤Ⓨ≧ἣ䛻䛴䛔䛶䛿ḟሗ䛷㏙䜉䜛䚹㻟㻚㻞㻌㻮㼕㻙㻞㻞㻞㻟 䝁䜲䝹䛾ᛂຊタィ䛸▷⤡㜵Ṇ㻌㻌 ୺せ䛺☢ሙⓎ⏕※䛸䛺䜛୰ᒙ Bi-2223 䝁䜲䝹䛻䛴䛔䛶䛿䚸᭤䛢䜂䛪䜏䛾ᙳ㡪ୗ䛻䛚䛡䜛㟁☢ᛂຊタィ䛜㔜せ䛷䛒䜛䚹⌧タィ䛷䛿䚸BJR 䛜䚸77 K 䛻䛚䛡䜛⥺ᮦ䞉᥋⥆䛾᭤䛢ᘬᙇヨ㦂䛻䜘䛳䛶ᚓ䛯 99% Ic ᅇ᚟᫬䛾ᘬᙇᛂຊ䜢ୗᅇ䜛䜘䛖䛻䛧䛶䛔䜛䠄Fig. 1 ཧ↷䠅䚹䜘䜚ಙ㢗ᛶ䛾㧗䛔ᛂຊタィ䛾䛯䜑䛻௒ᚋ 4K 䝣䞊䝥ᛂຊヨ㦂䜢ᐇ᪋䛩䜛䚹䜎䛯䚸ᩘ༑ km 䛾⥺ᮦ䜢౑⏝䛩䜛䛯䜑䚸ᕳ⥺䛾▷⤡䞉ᆅ⤡䜢㜵䛠䛣䛸䛜㠀ᖖ䛻㔜せ䛷䛒䜛䚹䛣䛾ほⅬ䛛䜙䚸ᐦᕳ䛝䝁䜲䝹䛻䛚䛡䜛⤯⦕䛻᭷ຠ䛺䝫䝸䜲䝭䝗㟁╔䛻䜘䜛䝁䞊䝔䜱䞁䜾⥺ᮦ䜢㛤Ⓨ䛧䛶䛔䜛䠄Fig. 2 ཧ↷䠅䚹㻟㻚㻟㻌㻴㼀㻿 䝁䜲䝹䛾㐽ⶸ㟁ὶ☢ሙゎᯒ㻌㻌 㧗㏿ከ㔜ᴟἲ䜢⏝䛔䛯 3D FEM 䛻䜘䛳䛶䚸Design A 䛾
REBCO ෆᒙ䝁䜲䝹䛜స䜛㐽ⶸ㟁ὶ☢ሙ䜢ᩘ್ゎᯒ䛧䛯䠄Fig.
3䠅䚹ບ☢ᚋ䛾 Z2 ᡂศ䛿-8.4 ppm/cm2䚸ບ☢䛛䜙 20 ᪥ᚋ䛾☢
ሙ䛾䝗䝸䝣䝖⋡䛿 0.009 ppm/h 䛸䚸᪤Ꮡ䛾☢ሙ⿵ṇཬ䜃☢ሙᏳᐃ໬ᢏ⾡䛷ᑐฎྍ⬟䛷䛒䜛䚹䛣䜜䛿䚸䝁䜲䝹䛜ⷧ⫗䝋䝺䝜䜲䝗ᙧ≧䜢䛧䛶䛚䜚ᚄ᪉ྥ☢ሙ䛜ᑠ䛥䛔䛯䜑䛷䛒䜛䚹䛯䛰䛧䚸኱䛝䛺య✚䜢༨䜑䜛 Bi-2223 䝁䜲䝹䛜኱䛝䛺㐽ⶸ㟁ὶ☢ሙ䜢⏕䜐ྍ⬟ᛶ䛜䛒䜚䚸䝣䜱䝷䝯䞁䝖䝤䝸䝑䝆䛾䛒䜛 Bi-2223 ⥺ᮦ䛾䝁䜲䝹䛾㐽ⶸ㟁ὶゎᯒᢏ⾡䛾㛤Ⓨ䜢㐍䜑䛶䛔䜛[1]䚹㻟㻚㻠㻌㻾㻱㻮㻯㻻 䝁䜲䝹䛾⇕ᭀ㉮ᢚไ䛸ಖㆤ㻌㻌 REBCO 䝁䜲䝹䛾᭱኱䛾ㄢ㢟䛿⇕ᭀ㉮䛾㜵Ṇ䛸ಖㆤ䛷䛒䜛䚹
No-Insulation (NI)ἲ䛿䛣䛾ほⅬ䛛䜙᭷ຠ䛷䛒䜛䛜䚸䝺䜲䝲䞊ᕳ䝁䜲䝹䛷䛿☢ሙ㐜䜜䛜㛗䛟䛺䜚䚸㐺⏝䛜ᐇ⏝ⓗ䛷䛿䛺䛛䛳䛯[2]䚹䛣䛾ほⅬ䛛䜙䚸☢ሙ㐜䜜䜢ᩘ᱆▷䛟䛷䛝䜛᪂䛧䛔䝺䜲䝲䞊ᕳ䛝㠀⤯⦕ (intra-Layer No-Insulation: LNI䠅ἲ䛾㛤Ⓨ䛻ᡂຌ䛧䛯[3]䚹

030

Fig. 3 Simulated screening current-induced field of theREBCO innermost coil.

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第95回

2017年度秋季低温工学・超電導学会

2A-a04

NMR㉸㟁ᑟ᥋ྜ䜢⏝䛔䛯Ọஂ㟁ὶ 㻝㻚㻟㻌㻳㻴㼦㻌㻺㻹㻾 䛻ྥ䛡䛶䠄䠎䠅㻌 㻌䡚㻠㻜㻜㻌㻹㻴㼦㻌㻔㻥㻚㻟㻥㻌㼀㻕☢▼⏝ 㻾㻱㻮㻯㻻 ෆᒙ䝁䜲䝹䛾༢యヨ㦂≉ᛶ䡚㻌
Towards a persistent current 1.3 GHz NMR using superconducting joints (2)䇵 Test results of a REBCO inner coil with superconducting joints
for a 400 MHz (9.39 T) LTS/REBCO NMR –ୖ㔝 ೺ᚿ䠈ᒣᓊ 㢼ᦶ, 㧗ᑿ ᬛ᫂䠄ୖᬛ኱䠅; ᒣཱྀ 㧗ྐ, ኱ᮌ ᗣኴ㑻, Ọ▼ ❳㉳ 䠄ఫ཭㟁ᕤ䠅䠗໭ཱྀ ோ 䠄NIMS䠅䠗℈⏣ ⾫ 䠄JASTEC䠅䠗㻌 ᮔ ௵୰, ᰗ⃝ ྜྷ⣖, ๓⏣ ⚽᫂ 䠄⌮◊䠅UENO Takeshi, YAMAGISHI Kazama, TAKAO Tomoaki (Sophia Univ)䠗YAMAGUCHI Takashi, OHKI Kotaro,
NAGAISHI Tatsuoki (SEI); KITAGUCHI Hitoshi (NIMS); HAMADA Mamoru (JASTEC);PIAO Renzhong, YANAGISAWA Yoshinori; MAEDA Hideaki (RIKEN)
E-mail: takeshi.ueno@riken.jp㻌n ್䛿 22 䛷䛒䛳䛯䚹䛯䛰䛧䚸䜘䜚ప㟁ὶ䛻䛚䛔䛶䛿䚸㟁ᅽ䛿䛣㻝䠊䛿䛨䜑䛻㻌䛾 n ್䝰䝕䝹䛾䜹䞊䝤䜢ୗᅇ䛳䛯䚹䛣䜜䛿䚸ప㟁⏺㡿ᇦ䛻䛚ᡃ䚻䛿䚸Ọஂ㟁ὶ 1.3 GHz NMR 䛾ᐇ⌧䛻ྥ䛡䛯➨୍Ṍ䛸䛔䛶䛿䚸᥋ྜ᢬ᢠ䛜䚸ȝV 䝺䝧䝹䛷ồ䜑䛯 n ್䛛䜙ண 䛥䜜䜛
䛧䛶䚸400 MHz (9.39 T) LTS/REBCO NMR 䜢㛤Ⓨ䛧䚸HTS ⥺್䜘䜚ప䛔䛣䛸䜢♧၀䛧䛶䛚䜚䚸NMR 䛻せồ䛥䜜䜛Ọஂ㟁ὶᮦ㛫䛾㉸㟁ᑟ᥋ྜ䜢⏝䛔䛯 NMR ☢▼䛸䛧䛶ୡ⏺ึ䛾ᐇド䜢㐠㌿䛻䛸䛳䛶᭷ຠ䛺≉ᛶ䛷䛒䜛䚹┠ᣦ䛧䛶䛔䜛䚹᪤䛻䚸▷᫬㛫⇕ฎ⌮䠄6 ᫬㛫䠅䛷ᙧᡂ䛷䛝䜛௒ᅇ䛾➨ 1 ḟヨస䛷䛿䚸ୖグ䛾㏻䜚 Ic 䛾せồ್>42 A 䜢‶
REBCO ⥺ ᮦ 䛾 ㉸ 㟁 ᑟ ᥋ ྜ (intermediate grown䛯䛫䛺䛛䛳䛯䚹௒ᚋ䚸᥋ྜฎ⌮䛸㏻㟁≉ᛶ䛾㛵ಀ䜢᫂䜙䛛䛻superconducting (iGS) joint) 䛾〇స᪉ἲ䞉᩿㠃ᵓ㐀䞉Ọஂ㟁䛩䜛䛸䛸䜒䛻䚸䝁䜲䝹䛾෌〇స䜢㐍䜑䜛䚹䜎䛯䚸Ⓨ⾲䛷䛿䚸䜘䜚ὶ≉ᛶ䜢♧䛧䛯[1]䚹ᮏሗ䛷䛿䚸䛣䛾ᡭἲ䛷᥋ྜ䛧䛯 400 MHz㧗䛔 Ic 䛾᥋ྜ䝃䞁䝥䝹䛾 Ic-B ≉ᛶ䚸௒ᅇ䛾䝁䜲䝹䛾 4.2 K 䛻NMR ☢▼⏝䛾 REBCO ෆᒙ䝁䜲䝹➨ 1 ḟヨస䛾༢యỌஂ㟁䛚䛡䜛Ọஂ㟁ὶヨ㦂⤖ᯝ䜒ሗ࿌䛩䜛ணᐃ䛷䛒䜛䚹ὶヨ㦂䛾⤖ᯝ䜢ሗ࿌䛩䜛䚹㻌ᮏ◊✲䛾୍㒊䛿ᩥ㒊⛉Ꮫ┬ ඛ➃◊✲ᇶ┙ඹ⏝ಁ㐍஦ᴗ䛾୍⎔䛸䛧䛶ᐇ᪋䛧䛯䚹㻌

5.70.6 T, 70 A

50 x 4.0

2.90 T, 17.5 A00㻌㻟䠊㻾㻱㻮㻯㻻 ෆᒙ䝁䜲䝹䛾༢యỌஂ㟁ὶヨ㦂㻌㻌 㻌 400 MHz NMR 䛾ෆᒙ REBCO 䝁䜲䝹䠄ෆᚄ 80 mm䚸㛗䛥
170 mm䚸4 䝺䜲䝲䞊䚸⥲ᕳᩘ 158.9䚸⮬ᕫ䜲䞁䝎䜽䝍䞁䝇 0.95mH䚸䝁䜲䝹ᐃᩘ 1.059 mT/A䚸77 K 䛷䛾 Ic = 137 A䠅䜢〇స䛧䚸REBCO ⥺ᮦ䜢⏝䛔䛯 PCS 䛾➃㒊䛸᥋ྜ䛧䛯䚹䝁䜲䝹䜢ᾮయ❅⣲୰䛷Ọஂ㟁ὶ㐠㌿䛧䚸☢ሙῶ⾶䜢䝩䞊䝹⣲Ꮚ䛷 ᐃ䛧䛯䚹Fig. 2 䛻䝁䜲䝹㟁ὶ 6.6 A 䛛䜙䛾Ọஂ㟁ὶ㐠㌿䛻䛚䛡䜛⣙ 5᪥㛫䛾☢ሙῶ⾶䜢♧䛩䠄䚽༳䠅䚹ῶ⾶㏿ᗘ䛛䜙ᚓ䜙䜜䜛≉ᛶ᢬ᢠ Rc 䛿䚸ῶ⾶㛤ጞ┤ᚋ䛿 6×10-7 ȍ 䛷䛒䛳䛯䛜䚸䛭䛾ᚋ䚸ᚎ䚻䛻ᑠ䛥䛟䛺䜚䚸18 ᫬㛫ᚋ䛻䛿 7×10-10 ȍ䚸100 ᫬㛫ᚋ䛻䛿
6×10-11 ȍ 䛻䜎䛷ῶᑡ䛧䛯䚹䛣䜜௨㝆䛾ῶ⾶䛿䚸䝣䝷䝑䜽䝇䜽䝸䞊䝥䛻≉ᚩⓗ䛺ᑐᩘ㛵ᩘ䜹䞊䝤䠄୍Ⅼ㙐⥺䠅䛾᣺䜛⯙䛔䜢♧䛧䛯䚹
ู㏵䚸䝁䜲䝹㟁ὶ 3.1 A 䛛䜙☢ሙῶ⾶䜢 ᐃ䛧䛯䛸䛣䜝䚸ᐃ⢭ᗘෆ䛷䛿᭷ព䛺ῶ⾶䛿ぢ䜙䜜䛺䛛䛳䛯䠄䕧༳䠅䚹ୖ㏙䛾
ᑐᩘ㛵ᩘ䜹䞊䝤䛻䜘䜛䛸䚸3.1 A 䛾᫬Ⅼ䛷䛾 Rc 䛿 2.3 × 10-15䃈䛷䛒䜛䛾䛷䠄Fig. 2 ཧ↷䠅䚸ᐇ㝿䛿䛣䛾䝺䝧䝹䛾᢬ᢠ䛻ᑐᛂ䛧䛯ῶ⾶䛜㉳䛝䛶䛔䜛䛸᥎ᐹ䛥䜜䜛䚹
Fig. 2 䛾☢ሙῶ⾶䜹䞊䝤䠄䚽༳䠅䜢䝁䜲䝹ᐃᩘ䛷㝖䛧䛶ᑐᛂ䛩䜛Ọஂ㟁ὶ್䜢⟬ฟ䛧䚸䛣䜜䛻 Rc 䜢᥃䛡ྜ䜟䛫䚸ᅇ㊰䛾㟁ᅽ-㟁ὶ≉ᛶ[2]䜢ィ⟬䛧䛯䚹㟁ᅽ-㟁ὶ≉ᛶ䛿 7×10-10 ȍ ௨ୖ䛾⠊ᅖ䛷䛿 n ್䝰䝕䝹䛻஌䜚䚸1 ȝV 䜢ᇶ‽䛸䛧䛯 Ic 䛿 5.3 A䚸4.2 K
77 K

100

0246810External magnetic field, Bex (T)Lift factor, Ic / Ic(77 K, 0 T)

Critical current, Ic (A)ཧ⪃ᩥ⊩㻌[1] Ohki et al. SuST 30 (2017) 115017[2] Takahashi et al. Presented at MT25, Mon-Af-Po1.09-13㻌

Fig.1 Ic-B characteristics of a joint sample in parallel fields.

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8Icoil: 6.6 A

Magnetic field, B 0 (mT)㻞䠊㻠㻜㻜㻌㻹㻴㼦㻌㻺㻹㻾 ☢▼䛻䛚䛡䜛㉸㟁ᑟ᥋ྜ䜈䛾せồ᮲௳㻌
1.3 GHz NMR 䛷䛿䚸LTS-HTS 䛾┤ิ㐠㌿䜢᝿ᐃ䛩䜛䛜䚸⌧ẁ㝵䛷䛿 REBCO ⥺ᮦ䛸 NbTi ⥺ᮦ䛾᥋ྜ䛜䛷䛝䛶䛔䛺䛔䛯 䜑 䚸 ௒ ᅇ 䛾 400 MHz NMR 䛷 䛿 䚸 LTS እ ᒙ 䝁 䜲 䝹 䛸REBCO ෆᒙ䝁䜲䝹䜢䛭䜜䛮䜜ಶู䛻Ọஂ㟁ὶ㐠㌿䛩䜛䚹
NMR ☢▼䛻ồ䜑䜙䜜䜛☢ሙῶ⾶⋡䠄10-8/h䠅䛾ほⅬ䜘䜚䚸REBCO ෆᒙ䝁䜲䝹䛾Ọஂ㟁ὶᅇ㊰䠄ᕳ⥺䞉᥋ྜྵ䜐䠅䛾ྜィ᢬ᢠ್䛿䚸㐠㌿㟁ὶ 134 A 䛻䛚䛔䛶 10-11 ȍ ௨ୗ䛷䛒䜛䛣䛸䛜ồ䜑䜙䜜䜛䚹n ್䝰䝕䝹䜢௬ᐃ䛧䛶ィ⟬䛩䜛䛸䚸REBCO ෆᒙ䝁䜲䝹䛾᥋ྜ䛿 4.2 K䚸0.6 T 䛾₃䜜☢ሙ୰䠄᥋ྜ㠃䛻ᑐ䛧䛶୪⾜䠅䛷䚸Ic >168 A䚸᢬ᢠ <5×10-13 ȍ 䛜せồ䛥䜜䜛䚹㻌 䜽䝷䝑䝗㖡ᒙ䜢ෆ㒊䛻ᣢ䛴䝁䜲䝹⏝⥺ᮦ䛸䚸㖡Ᏻᐃ໬ᮦ䜢ᣢ
䛯䛺䛔 PCS ⏝⥺ᮦ䛷〇స䛧䛯᥋ྜ䝃䞁䝥䝹䠄77 K ,0 T 䛷 Ic =17.5 A䠅䛾 77 K, 4 K 䛻䛚䛡䜛୪⾜☢ሙ୰䛾 Ic-B ≉ᛶ䜢 Fig.1
䛻♧䛩䚹4.2 K 䛾ሙྜ䚸0.6 T 䛷䛿 Ic 䛜 70 A 䛷䛒䜛䚹䛣䜜䛿䚸
77 K , 0 T 䛷䛾 Ic 䛾 4 ಸ䛷䛒䜛䚹䛩䛺䜟䛱䚸REBCO ෆᒙ䝁䜲䝹䛾᥋ྜ Ic 䛿 77 K 䛻䛚䛔䛶 42 A ௨ୖ䛷䛒䜛䛣䛸䛜ᚲせ䛷䛒䜛䚹

76Rc: 6 x 10-7 ȍ

Ic: 5.3 An: 22

Icoil: 5.07 A, Rc: 8.5x10-8 ȍ
Rc: 7x10-10 ȍ

543Rc: 6 x 10-11 ȍ

Icoil: 3.1 A

Icoil: 3.53 A, R-15:
Rc: 2.3 x 10 c ȍ
6x10-13 ȍ

Coil constant: 1.059 mT/A
Logarithmic curve
L: 0.95 mH

2 -3 -2 -1 0 1 2 3 4 5 6 710 10 10 10 10 10 10 10 10 10 10Time (h)Fig.2 Magnetic field decays of the REBCO coil at 77 K.

第95回

2017年度秋季低温工学・超電導学会