Proceedings of the 1st Annual Meeting of Particle Accelerator Society of Japanand the 29th Linear Accelerator Meeting in Japan (August 4 - 6, 2004, Funabashi Japan)

A SUPERSTRONG ADJUSTABLE PERMANENT MAGNET QUADRUPOLEFOR THE FINAL FOCUS LENS IN A LINEAR COLLIDER
T. Mihara1,A),,Y. Iwashita A), M. Kumada B), E. Sugiyama C)
Nuclear Science Research Facility, Institute for Chemical Research, Kyoto University
Gokanosho, Uji, Kyoto 611-0011
B)
National Institute of Radiological Sciences, 4-9-1,Anagawa, Inage-ku,Chiba-shi,263-8555 JAPANC)
NEOMAX Co., Ltd. Egawa, Shimamoto-cho Misima-gun, Osaka, 618-0013
A)

Abstract
A super strong adjustable permanent magnet quadrupole was fabricated. Strength adjustability can be obtained byslicing the magnet into pieces along the beamline direction and rotating these slices. But this technique may lead to
movement of the magnetic center and introduction of a skew quadrupole component when the strength is varied. A
double ring structure, which is the scheme of the adjustability for the fabricated PMQ, can reduce the movement of themagnetic center and a skew quadrupole component to 1/10 and 1/60 respectively.
The properties of the permanent magnet materials change with time. The magnet can be stabilized by heating it to atemperature well above its operating temperature for a few hours. The magnets of PMQ were heated to temperatures
above the room temperature respectively. Their field gradients were measured before and after the heating process.
Their properties changed less than 1%.

ᒝᐲนᄌߥ⿥ᒝജ᳗ਭ⏛⍹ࠍ↪޿ߚ࡝࠾ࠕࠦ࡜ࠗ࠳࡯↪ᦨ⚳㓸᧤࡟ࡦ࠭㧝㧚ߪߓ߼ߦ

᷷ᐲଐሽᕈߢ޽ࠆ‫ޕ‬᳗ਭ⏛⍹ߪ৻⥸ߦ᷷ᐲଥᢙࠍᜬ
NdFeB♽᳗ਭ⏛⍹ߪ
ᡷ⦟ဳ*CNDCEJ⏛᳇࿁〝ࠍ↪޿ߚFKRQNG߇6ߣ ߟ‫੹߽ߢ߆ߥޕ‬࿁૶↪ߒߡ޿ࠆ᷷ᐲଥᢙ߇Ყセ⊛㜞ߊ‫⵬ޔ‬ఘࠍⴕ߁ᔅⷐ߇޽ࠆ‫ߎޕ‬޿߁㕖Ᏹߦᒝജߥ⏛႐ࠍ⸥㍳ߒߚ=?‫ߩߎޕ‬ᛛⴚ ࠇߦߪ᷷ᐲ⵬ఘ᧚ࠍ↪޿ߚᣇᴺ߇᦭ലߢ޽ࠆ‫ࠇࠊޕ‬ࠍᔕ↪ߒ‫⚳ᦨߩ࡯࠳ࠗ࡜ࠦࠕ࠾࡝ޔ‬㓸᧤࡟ࡦ࠭߳ะ ࠊࠇߪ᷷ᐲ⵬ఘ᧚ࠍ߽ߜ޿ߡ⹜૞৻ภᯏߩ᷷ᐲଥᢙߌߚᡷ⦟ဳ*CNDCEJ⏛᳇࿁〝ߦࠃࠆ྾ᭂ⏛⍹ࠍ᭴ᚑ ࠍ-710 %/͠߆ࠄ-310 %/͠߹ߢᷫዋߔࠆߎߣ߇ߒߚ‫ޕ‬NLC(Next Linear Collide ,SLAC)ߩࡄ࡜ࡔ࡯࠲ ಴᧪ߚ‫[ ޕ‬4,5]㨫
ߦḰ᜚ߒߚ႐ว‫⚳ᦨޔ‬㓸᧤࡟ࡦ࠭ߪ‫ޔ‬෻ᔕὐ߆ࠄ ߽߁৻ߟߪ‫ޔ‬ᒝᐲ߇࿕ቯߐࠇߡ޿ࠆߣ޿߁ὐߢ޽
3.5m ߩ〒㔌ߦ޽ࠆ㨫߹ߚ‫ޔ‬෻ᔕὐߢߩ㔚ሶ㓁㔚ሶ ࠆ‫⚳ᦨߩ࡯࠳ࠗ࡜ࠦࠕ࠾࡝ޕ‬㓸᧤ߦ↪޿ࠆߚ߼ߦߪ
ࡆ࡯ࡓߩ੤Ꮕⷺ߇20mradߢ޽ࠆߎߣ߆ࠄ‫⚳ᦨޔ‬㓸᧤ 1%એ਄ߩಽ⸃⢻ߢᒝᐲนᄌߢ޽ࠆᔅⷐ߇޽ࠆ‫ߎޕ‬࡟ࡦ࠭๟ㄝߢߪ౉኿ࡆ࡯ࡓ࡜ࠗࡦߩ7cmߘ߫ࠍኻะ ࠇࠍ⸃᳿ߔࠆߚ߼ߦ㨮ᒝᐲนᄌߥੑ㊀࡝ࡦࠣ᭴ㅧࠍ
ࡆ࡯ࡓ࡜ࠗࡦ߇ㅢࠆߎߣߦߥࠅ‫ޔ‬㓸᧤⏛⍹ߣኻะ ↪޿ߚ᳗ਭ྾ᭂ⏛⍹ߩ⹜૞ੑภᯏࠍ⵾૞ߒߚ㨫ࡆ࡯ࡓߩᐓᷤࠍㆱߌࠆᎿᄦ߇ᔅⷐߣߥࠆ‫◲߽ᦨޕ‬න ߹ߚ‫ޔ‬᳗ਭ⏛⍹ߪ⚻ᐕᄌൻߔࠆߎߣ߇⍮ࠄࠇߡ߅
ߥᣇᴺߪ‫⚳ᦨޔ‬㓸᧤࡟ࡦ࠭ࠍඨᓘ߇7cmࠃࠅ߽ዊߐ ࠅ‫ޔ‬㐳ᦼߩ૶↪ࠍ⠨߃ߚ႐วߎߩᓇ㗀߇ ᔨߐࠇࠆ‫ޕ‬޿྾ᭂ⏛⍹ߢ᭴ᚑߔࠆߎߣߢ޽ࠆ‫ߩߎޕ‬ᄢ߈ߐߢ㕖 ߘߎߢ‫⚻ޔ‬ᐕᄌൻࠍ✭๺ߔࠆߚ߼ߦ‫↪૶ޔ‬ⅣႺࠃࠅᏱߦᒝ޿⏛႐൨㈩ࠍᓧࠆߎߣߪ㔚⏛⍹ߢߪ㔍ߒ޿߇‫ ޔ‬㜞᷷ߥⅣႺߦ⏛⍹ࠍ߅޿ߡ⚻ᐕᄌൻࠍᒝ೙⊛ߦㅴ߹᳗ਭ⏛⍹ߢ޽ࠇ߫น⢻ߢ޽ࠆ[3]‫⹜ޕ‬૞৻ภᯏߪ⵾૞ ߖߡ߅ߊ‫ࠣࡦࠫ࡯ࠛޔ‬ಣℂࠍⴕߞߚ㨫߹ߚ‫ߩߎޔ‬ㆊ߆ࠄ᷹ቯ߹ߢࠍ⚳߃‫ޔ‬ඨᓘOO㨮⏛⍹ᄖᓘOOߩᄢ߈ ⒟ߢᷫ⏛߇⿠ࠄߥ߆ߞߚߎߣࠍ⏕߆߼ࠆߚ߼ߦࠛ࡯ߐߢ⏛႐൨㈩߇6OOߣ޿߁ᒝജߥ୯ࠍ␜ߒߚ㨫 ࠫࡦࠣ೨ᓟߦ⏛႐᷹ቯࠍⴕߞߚ‫ޕ‬⸃᳿ߔߴ߈໧㗴ὐ߇ੑὐ޽ࠆ‫ߪߟ৻ޕ‬᳗ਭ⏛⍹ߩ ᧄⓂߢߪᒝᐲนᄌ᭴ㅧߣࠛ࡯ࠫࡦࠣಣℂߦߟ޿ߡ⺰ߓࠆ‫ޕ‬-4㧞㧚ᒝᐲนᄌ᭴ㅧ࿑ 1 ᳗ਭ྾ᭂ⏛⍹(⹜૞৻ภᯏ)1-5᳗ਭ྾ᭂ⏛⍹ߪ㔚⏛⍹ߩࠃ߁ߦബ⏛㔚ᵹߢ㓸᧤ᒝᐲࠍࠦࡦ࠻ࡠ࡯࡞ߔࠆߎߣߪ಴᧪ߥ޿‫ޔߢߎߘޕ‬࿑ߩࠃ߁ߦゲᣇะߦ⏛⍹ࠍಽഀߒߡ࿁ォߔࠆߎߣ߇⠨߃ࠄࠇࠆ‫ޕ‬྾ᭂ⏛⍹ߪq࿁ォߔࠆߣ㓸᧤ߣ⊒ᢔ߇౉ࠇᦧࠊࠆߚ߼‫ޔ‬ಽഀߒߚ⏛⍹ߩ৻ㇱࠍ࿁ォߔࠆߎߣߢో૕ߩ㓸᧤ᒝᐲࠍᄌൻߐߖࠆߎߣ߇಴᧪ࠆ‫ޕ‬ᦨ⚳㓸᧤࡟ࡦ࠭ߢߪUMGYᚑಽࠍᭂജㆱߌࠆᔅⷐ߇޽ࠆߚ߼‫ޔ‬྾ᭂ⏛⍹ߩ࿁ォⷺߪqߣqߦ㒢ቯߔࠆ‫ޕ‬E-mail: mihara@kyticr.kuicr.kyoto-u.ac.jp254Proceedings of the 1st Annual Meeting of Particle Accelerator Society of Japanand the 29th Linear Accelerator Meeting in Japan (August 4 - 6, 2004, Funabashi Japan)ߎ߁ߔࠆߎߣߢ㨮ℂᗐ⊛ߦߪUMGYᚑಽߪߦߔࠆߎߣ ࿁ォ೨ᓟߢᄌࠊࠆߚ߼‫ޔ‬᷷ᐲ⵬ఘ᧚ߩലᨐ߇࿁ォ೨߇಴᧪ࠆ=?
ᓟߦࠃߞߡᄌࠊࠅ‫ޔ‬ᱜߒ޿㈩⟎ࠍߒߥߌࠇ߫࿁ォ೨ᓟߩ᷷ᐲଥᢙ߇ᄢ᏷ߦᄌࠊࠆߎߣߦߥࠆ㨫ߎࠇߪᄖベߣౝベߘࠇߙࠇ⁛┙ߦ᷷ᐲ⵬ఘࠍᣉߔߎߣߢ⸃᳿࿑ 2 ᒝᐲนᄌ᭴ㅧ࿑ 4 ᷷ᐲ⵬ఘ᧚(MS-1)ઃ᳗ਭ྾ᭂ⏛⍹㧟㧚ੑ㊀࡝ࡦࠣ᭴ㅧ࿑ߩࠃ߁ߥ⏛⍹ߩ࿁ォᤨߦߪᯏ᪾⊛ߥゲߕࠇ߿‫ࠆ߈ߢ ޔ‬㨫஗ᱛⷺᐲߩ࠭࡟߇੍ᗐߐࠇࠆ‫ߩࠄࠇߎޕ‬ᓇ㗀ࠍ✭๺ 㨀㧻㧿㧯㧭ߦࠃࠆࠪࡒࡘ࡟࡯࡚ࠪࡦߩ⚿ᨐࠍరߦ‫ޔ‬ߔࠆߚ߼ߦ‫ޔ‬ੑ㊀࡝ࡦࠣ᭴ㅧ߇᦭ലߢ޽ࠆ ࿑ ‫ ޕ‬࿁ォ೨ᓟߢߩ᷷ᐲଥᢙࠍߘࠇߙࠇ1/10એਅߦᛥ߃ࠄ
ੑ㊀࡝ࡦࠣ᭴ㅧߢߪ⏛⍹ߪ߹ߕേᓘᣇะߦੑߟߦ ࠇࠆࠃ߁ߦౝベߣᄖベߩ᷷ᐲ⵬ఘ᧚ߩಽ㊂ߣ㈩⟎ࠍಽ߆ࠇߡ߅ࠅ‫ࠇߙࠇߘޔ‬ᄖベ‫ޔ‬ౝベߣ๭ࠎߢ޿ࠆ‫ ޕ‬᳿ቯߒߚ(࿑ 4)㨫੹ᓟᕈ⢻⹜㛎ࠍⴕ߁‫ޕ‬ߎߩ߁ߜᄖベߩߺ߇ゲᣇะߦಽഀߐࠇߡ߅ࠅ‫ޔ‬ౝベ㧡㧚ࠛ࡯ࠫࡦࠣಣℂ

࿑3

ੑ㊀࡝ࡦࠣ᭴ㅧ

ߪ࿕ቯߒ‫ޔ‬ᄖベߩߺࠍ࿁ォߔࠆ‫ࠄ߆ࠕࡏޕ‬㆙޿ㇱಽߩߺࠍ࿁ォߔࠆߚ߼‫ޔ‬ゲߕࠇ߿UMGY߳ߩᓇ㗀߇✭๺ߐࠇࠆ‫੹ޕ‬࿁⸳⸘㨮⵾૞ߒߚ⹜૞ੑภᯏߪߎߩੑ㊀࡝ࡦࠣ᭴ㅧࠍ↪޿ߡ޿ࠆ‫ߒߦ࡞࠺ࡕࠍ࠲࡯࠺⸘⸳ޕ‬ߚ⸘▚ᯏࠪࡒࡘ࡟࡯࡚ࠪࡦߦࠃࠆߣ‫ޔ‬࿑ߩࠃ߁ߥ
᭴ㅧߦᲧߴߡ࿁ォ⺋Ꮕߩゲߕࠇ߳ߩᓇ㗀ߪ‫ޔ‬
UMGY߳ߩᓇ㗀ߪߣᄢ߈ߊ✭๺ߐࠇࠆ‫?=ޕ‬᳗ਭ⏛⍹ߪ⚻ᐕᄌൻߔࠆᕈ ⾰ ࠍᜬߟ‫ޕ‬㐳ᦼߦࠊߚߞߡ૶↪ߔࠆ㓙ߦߪήⷞߢ߈ߥ޿ࡄ࡜ࡔ࡯࠲ߢ޽
ࠆ‫ޕ‬᳗ਭ⏛⍹ࠍㅢᏱ૶↪ߔࠆⅣႺࠃࠅ߽㜞޿᷷ᐲߦ⟎޿ߡ߅ߊߎߣߢ‫⚻ߩߎޔ‬ᐕᄌൻࠍᣧߊ߅ߎߐߖߡ߅߈ ࠛ࡯ࠫࡦࠣ ‫⚻ߩᤨ↪૶ޔ‬ᐕᄌൻ㊂ࠍዋߥߊߔ
ࠆߎߣ߇಴᧪ࠆ[6,7]㨫⹜૞ੑภᯏߦ૶↪ߔࠆᄖベ⏛⍹‫ޔ‬ౝベ⏛⍹ߘࠇߙࠇߩࠛ࡯ࠫࡦࠣಣℂࠍⴕߞߚ‫ޕ‬
6.1 ⏛⍹ߩ઀᭽੹࿁૶↪ߒߡ޿ࠆ᳗ਭ⏛⍹ߪ0'1/#:␠⵾ߩ0F(G$♽⏛⍹ߢౝベߣᄖベߢ᧚⾰ࠍᄌ߃ߡ޽ࠆ‫ޕ‬࿑ߦ⷗ࠄࠇࠆࠃ߁ߦౝベߪ‫ߦࠕࡏޔ‬ㄭ޿ߣߎࠈߢߩㅒ⏛႐߇ᒝߊ‫ᦨޔ‬ᄢߢM1Gࠍ⿥߃ࠆ‫ߩߎޕ‬ㅒ⏛႐ߦࠃࠆᷫ⏛ࠍ㒐ߋߚ߼ߦౝベ⏛⍹ߪ࿕᦭଻ᜬജ K*% ߇㜞޿ 0'1/#:#* K*EM1G $T ࠍ૶ߞߡ޿ࠆ‫ޕ‬৻ᣇᄖベߪㅒ⏛႐߇㜞‫ޘ‬M1Gߥߩߢ‫ޔ‬ᱷ⇐⏛᧤ኒ
ᐲ $T ߩ㜞޿ 0'1/#:* K*EM1G $T ࠍ૶ߞߡ޿ࠆ‫ޕ‬㧠㧚᷷ᐲ⵬ఘ࡚ࠪ ͠߆ࠄ  ͠ ࿑ 5 ੑ㊀࡝ࡦࠣ᭴ㅧߩ⏛᧤ಽᏓ ౝベߩ‫⏛ޔ‬ᭂߦ⏛߹ߢᷫዋߔࠆߎߣ߇಴᧪ߚ㨫ߎߩᚻᴺߪ⹜૞ੑภᯏ᧤߇㓸ਛߒߡ޿ࠆ‫⏛ޕ‬ᭂࠍߪߐ߻⏛⍹ߩ⏛᧤ߦ߽ㆡ↪ߐࠇࠆ߇‫ޔ‬ੑ㊀࡝ࡦࠣ᭴ㅧߢߪ⏛႐ಽᏓ߇߇ࡏࠕߩㄭߊߢ෻ォߒߡ޿ࠆ‫ޕ‬⹜૞৻ภᯏߢߪ᷷ᐲ⵬ఘ᧚ߢ⏛᳇࿁〝ࠍ࡯࠻
-3 10-5%/ߔࠆߎߣߢ᷷ᐲଥᢙࠍ-7 10-4%/

255

Proceedings of the 1st Annual Meeting of Particle Accelerator Society of Japanand the 29th Linear Accelerator Meeting in Japan (August 4 - 6, 2004, Funabashi Japan)ࠛ࡯ࠫࡦࠣ᧦ઙߩ⏛႐᷹ቯࠍⴕ޿‫ޔ‬Ყセߒߚ㨫⏛⍹ࠍ࿁ォบߦタߖ‫ޔ‬⏛᳇࿁〝ߢߪ᳗ਭ⏛⍹ߦߪㅒ⏛႐߇߆߆ߞߡ߅ࠅ‫ ޔ‬࿑ 7 ߩ᭽ߦࡎ࡯࡞⚛ሶࠍ㈩⟎ߒ‫⏛ޔ‬⍹ࠍ࿁ォߒߡࠠࡘ࡝࡯ὐࠃࠅૐ޿᷷ᐲਅߢ߽ᷫ⏛ߩෂ㒾ᕈ߇޽ࠆ ࡎ࡯࡞⚛ሶߢ᷹ቯߒߚ‫⏛ޕ‬႐᷹ቯߩ⛘ኻ♖ᐲߪ⚂ߚ߼‫ޔ‬PANDIRAߦࠃࠆࠪࡒࡘ࡟࡯࡚ࠪࡦߣ᳗ਭ⏛ 1%⒟ᐲߣߥࠆ‫ޕ‬࿑8ߦ⏛႐᷹ቯ⚿ᨐࠍ␜ߔ‫ޕ‬᷹ቯ♖⍹ߩ࿕᦭଻ᜬജߩ᷷ᐲ․ᕈ(࿑6)߆ࠄ‫ޔ‬ᷫ⏛߇⿠ߎࠄ ᐲࠃࠅᄢ߈޿⏛႐ߩᄌൻߪᄖベ‫ޔ‬ౝベ౒ߦή߆ߞߚ‫ޕ‬ߥ޿᭽ߦ⇐ᗧߒߡࠛ࡯ࠫࡦ᷷ࠣᐲࠍ᳿ቯߒߚ㨫⚵┙ ߎࠇߦࠃߞߡ㨮ᷫ⏛ߪ⿠ߞߡ޿ߥ޿ߎߣ߇⏕߆߼ࠄ೨ߩ⏛⍹ߦ߅޿ߡᦨ߽ᒝ޿ㅒ⏛႐ߪౝベߢ18kOe‫ߚࠇ ޔ‬㨫ᄖベߢ12kOeߢ޽ߞߚ‫ࠣࡦࠫ࡯ࠛޕ‬᷷ᐲࠍ‫ޟ‬࿕᦭଻ᜬജ߇ㅒ⏛႐ߩᦨᄢ୯ࠃࠅ30%એ਄㜞޿᷷ᐲ‫ ޔߒߣޠ‬㧢㧚߹ߣ߼ౝベߪ 60 ͠‫ޔ‬ᄖベߪ40͠ߢࠛ࡯ࠫࡦࠣࠍⴕߞߚ‫⿥ ޕ‬ᒝജ᳗ਭ྾ᭂ⏛⍹ߩ⹜૞ੑภᯏࠍ᭴ᚑߒߚ(࿑ 9)‫ޕ‬ࠛ࡯ࠫࡦࠣߦ߆ߌߚᤨ㑆ߪ౒ߦ⚂4ᤨ㑆ߢ޽ࠆ㨫ᒝᐲนᄌߥੑ㊀࡝ࡦࠣ᭴ㅧࠍ߽ߜ‫ޔ‬᷷ᐲ⵬ఘ᧚ࠍⵝ6.3 ࠛ࡯ࠫࡦࠣ೨ᓟߢߩᄌൻ
ࠛ࡯ࠫࡦࠣࠍⴕ߁ߎߣߦࠃࠆ⊒↢⏛႐ߩᄌൻߪᓸ ஻ߒߡ޿ࠆ‫ޕ‬ዊߢ޽ࠆ߇‫ޔ‬ᷫ⏛߇⿠ߎࠇ߫ᄢ߈ߊᄌൻߔࠆ‫ޕ‬ᷫ⏛  ⚻ᐕᄌൻߩᓇ㗀ࠍ✭๺ߔࠆߚ߼ߦࠛ࡯ࠫࡦࠣࠍߒߡ޿ߥ޿ߎߣࠍ⏕߆߼ࠆߚ߼ߦ‫ࠣࡦࠫ࡯ࠛޔ‬೨ᓟ ⴕߞߚ‫ޔࠆࠃߦࠇߎޕ‬1%એ਄ߩ⊒↢⏛႐ߩᷫዋߪ⷗ࠄࠇߥ߆ߞߚ‫ޕ‬ ੹ᓟߪ⹜૞ੑภᯏߩ⏛႐൨㈩ߩ᷹ቯ‫ߞ઻ߦࠇߘޔ‬?G1 ߡ᷷ᐲଥᢙߩ᷹ቯࠍⴕ߁੍ቯߢ޽ࠆ‫ޕ‬
M=6.2

0'1/#:*0'1/#:#*EK* ജᜬ଻᦭࿕

᷷ᐲ=͠?



࿑ 6 ᳗ਭ⏛⍹ߩ࿕᦭଻ᜬജߩ᷷ᐲଐሽᕈ

࿑ 9 ᳗ਭ྾ᭂ⏛⍹⹜૞ੑภᯏ

ෳ⠨ᢥ₂
࿑ 7 ⏛႐᷹ቯߩ᭎⇛࿑(ᄖベ)‫࡞࡯ࡎޕ‬㕙ߪേᓘᣇะ߹ߚߪ࿁ォᣇะߦะߌࠄࠇࠆ‫ޕ‬㪇㪅㪌㪴㪫㪲 㪇㪅㪋ᐲኒ 㪇㪅㪊᧤⏛ 㪇㪅㪉㪇㪅㪈㪸㫊㫀㫅㪾೨㪸㫊㫀㫅㪾ᓟ㪇㪀㪛㪀 㪥㪀 㪛㪀 㪥㪀 㪛㪀 㪥㪀 㪛㪀 㪥㪀 㪛㪀 㪥㪀 㪛㪀 㪘㪥㪩㪘 㪇㩿㪫㪘 㩿㪩㪘 㪇㩿㪫㪘 㩿㪩㪘 㪇㩿㪫㪘 㩿㪩㪘 㪇㩿㪫㪘 㩿㪩㪘 㩿㪫㪘 㪇㩿㪩㪘 㪇㩿㪫㩿㪇㪇㪇㪇㪇 㪇㪣㪏 㪣㪏 㪣㪋 㪣㪋 㪣㪉 㪣㪉 㪣㪈 㪣㪈 㫀㫅㪈㪇 㫀㫅㪈㪇 㫀㫅㪊 㫀㫅㪊࿑ 8 ࠛ࡯ࠫࡦࠣ೨ᓟߩ⏛႐᷹ቯ⚿ᨐ‫(ޕ‬RAD)ߪേ
   ᓘᣇะ‫(ޔ‬TAN)ߪ࿁ォᣇะߩ᷹ቯ୯‫ޕ‬L80ߪ   ᄖベ8cmㇱຠࠍ‫ޔ‬in100ߪౝベ(᷹ቯ૏⟎߇   ┵߆ࠄ100mm)ࠍ޽ࠄࠊߒߡ޿ࠆ‫ޕ‬[1] K.Halbach, IEEE, Trans., NS26 (1979), 3882, NIM169(1989)1 NIM 187(1981)109 NIM 198(1982)213[2] M.Kumada et al., (Patent pending). CERN Courier, volume41, number7, September 2001, p.9.
[3] Y. Iwashita, T. Mihara, E. Antokhin, M. Kumada, M. Aoki,“Permanent Magnet Quadrupole for Final Focus for Linear
Collider”, PAC03, May 12-16, 03, Portland, OR,p21982200:
http://accelconf.web.cern.ch/accelconf/p03/PAPERS/WPAB06 9.pdf[4] T. Mihara, Y. Iwashita, M. Kumada. C.M. Spencer, E.
Antokhin, “Super Strong Permanent Magnet Quadrupole fora Linear Collider” 18th International Conference on Magnet
Technology, Japan, 2003
[5] T. Mihara, Y. Iwashita, M. Kumada, E. Antokhin, E.
Sugiyama, C.M. Spencer, “A Super Strong Permanent
Magnet for the Final Focus Quadrupole in a LinearCollider“, APAC04, May 22-26,2004, South Korea.
[6] W. Lou, D. Hartill, D. Rice, D. Rubin, and J. Welch“Stability considerations of permanent magnet quadrupoles
for CESR phase-III upgrade” PRST-AB VOLUME 1,022401 (1998)[7] J. T. Volk et. al. “Stability Test of Permanent Magnets
Built with Strontium Ferrite” pac01 p3260-3262

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