Proceedings of the 5th Annual Meeting of Particle Accelerator Society of Japanand the 33rd Linear Accelerator Meeting in Japan (August 6-8, 2008, Higashihiroshima, Japan)

Study of the residual gas in S-LSRA)

A)

A)

Hiromu Tongu , Akira Noda , Hikaru Souda , Masao NakaoA)
B)
C)
Akihisa Wakita , Toshiyuki Shirai , Masahiro Ikegami
A)

A),Advanced Research Center for Beam Science, Institute for Chemical Research, Kyoto University
Gokano-sho, Uji, Kyoto, 611-0011 JapanB)
National Institute of Radiological Sciences
4-9-1 Anagawa, Inage-ku,Chiba-shi, 263-8555 JapanC)
Kansai Photon Science Institute, Japan Atomic Energy Agency
8-1 Umemidai Kizugawa-city Kyoto 619-0215 JapanAbstract
S-LSR is a compact ion storage and cooler ring to inject beam of the 7MeV proton and the 40MeV Mg+. The averagevacuum pressure measured by the vacuum gauges without beam was achieved up to about 4x10-9 Pa. The beam lifetime
can be estimated with the vacuum pressure or the loss-rate of the beam energy (the Schottky-noise). The values of theestimated lifetime are nearly equal to the measured lifetime values (the storage current).
イオ ン蓄積リ ング S-LSRにお ける残留 ガスの考 察 Ởா㒌ኬᏕ໩Ꮥ◂✪ᡜ࡚ࡢ࢕࢛ࣤ⵫✒࣬෫༴ࣛࣤࢡ
8187ࢅ⏕࠷࡙2H;ࣈࣞࢹࣤ࠽ࡻࡦNH;2J ࡡࣄ࣭࣑෫༴ᐁ㥺ࢅ⾔ࡖ࡙ࡀࡒࠊࡆࡿࡱ࡚ࡡᐁ㥺◂✪࡞ࡻࡽ 㞹Ꮔࣄ ࣭࣑෫ ༴࡞ࡻ ࡾࣈࣞࢹ ࣤࣄ࣭ ࣑ࡡ ḗ ඔ
4UIHULQJ⌟㇗@B࡝࡜ࡡᠺᯕࢅ࠵ࡅ࡙࠷ࡾࠊࡱࡒࠉ
8187ࡢ࣭ࣝࢧ࣭෫༴ࢅ⏕࠷࡙ࢠࣛࢪࢰࣜࣄ࣭࣑ࢅᐁ⌟࡚ࡀࡾࣚࢷ࢔ࢪᵋ㏸ࢅ⩻៎ࡊࠉスゝࡈࡿ࡙࠷ࡾࣛࣤࢡ࡚࠵ࡽࠉࢠࣛࢪࢰࣜࣄ࣭࣑ࡡᐁ⌟ࢅ┘ᵾ࡞2Jࣄ࣭࣑ࡡ࣭ࣝࢧ࣭෫༴࡞ࡻࡾ㸨ḗඔ෫༴ࡡᐁ㥺ࢅ㐅ࡴ࡙࠷ࡾ@B@Bࠊࢠࣛࢪࢰࣜࣄ࣭࣑࡛ࡢ✪ᴗ࡞ࡱ࡚෫࠻ࡒࣄ࣭࣑࡚࠵ࡽ྘◂✪᪃ス࡚⌦ㄵࠉᐁ㥺࡛ࡵ࡞◂✪ࡈࡿ࡙ࡀࡒ࠿ࠉࡱࡓᐁ㥺Ⓩ࡞☔ヾࡈࡿࡾ࡞⮫ࡖ࡙࠷࡝࠷ࠊࣄ࣭࣑෫༴ᐁ㥺ࢅ⾔࠹࡞ࡢ෫༴᫤㛣ࠉῼᏽ᫤㛣ࡡࡒࡴࡡࣄ࣭࣑ᑋ࿤࠿ᚪさ࡚࠵ࡾࠊ8187࡚ࡢ2J ࣄ࣭࣑⵫✒ࡡࣄ࣭࣑ᑋ࿤ࡢ⌟≟࡚⛂⛤ᗐ࡚࠵ࡽࣄ࣭࣑
෫༴ᐁ㥺࡞࠽ࡄࡾࣄ࣭࣑ῼᏽ᫤㛣ࡡᨭၻ࡞ࡻࡾຝᯕࡢኬࡀ࠷࡛⩻࠻ࡼࡿࡾࠊᮇⓆ⾪࡚ࡢ8187ࡡ┷✭⎌ሾཀྵࡦࣄ࣭࣑ᑋ࿤ࡡ⌟≟࡞ࡗ࠷࡙ሒ࿈ࡌࡾࠊࢰࣤࢪࢅ㉲࠻ࡆ࡛࡞ࡻࡖ࡙ࣄ࣭࣑࠿᥾኶ࡌࡾࠊࣈࣞ
ࢹ࡛ࣤ2J࡚ࡢ␏࡝ࡾࣄ࣭࣑ᩋ஗㐛⛤࠿ࣄ࣭࣑᥾኶ࡡ୹ཋᅄ࡛࡝ࡖ࡙࠷ࡾࠊᅒ㸦࡞♟ࡌゝ⟤⤎ᯕ࠾ࡼࣈࣞ
ࢹࣤࣄ࣭࣑࡚ࡢ⾢✲ᩋ஗ࠉ2Jࡢ㞹Ꮔᤍ⋋࠿୹ཋᅄ࡚࠵ࡽࠉࣈࣞࢹࣤ࡞Ẓ࡬2Jࡡᑋ࿤ࡢ㟸ᖏ࡞▯࠷ࠊ෫༴᫤㛣ࠉゝῼ᫤㛣ࢅ⩻៎ࡌࡾ࡛⛂௧୕ࡡࣄ࣭࣑ᑋ࿤࠿ᚪさ࡛⩻࠻ࡾࠊᅒ㸦ࡻࡽ8187ࡢ5F௧ୖࡡᖲᆍ┷✭ᅸࢅ⥌ᣚࡌࡾᚪさ࠿࠵ࡾࠊ㸨㸣┷✭⣌ࡡ⌟≟8187ࡡ┷✭⣌ࡢᖲᆍ┷✭ᅸࢅ5Fࢅ┘ᵾ࡞スゝࡊ࡙࠷ࡾࠊ࡮࡯ධ࡙ࡡ┷✭ࢱࢠࢹࡢΥࡡࣈ࣭ࣝ࣊࢞ࣤࢡฌ⌦ࢅ᤿⏕ࡊ@Bࠉ࣒࢕ࣤ࣎ࣤࣈࡢࢲࢰࣤࢣࢴࢰ࣭࣎ࣤࣈࠉࢪࣂࢴࢰ࣭࢕࢛ࣤ࣎ࣤࣈࢅ౐⏕ࡊᤴẴࢅ⾔ࡖ࡙࠷ࡾࠊࡱࡒࠉ࣎ࣤࣈࡡス⨠ࢪ࣭࣋㸧㸣ࣄ࣭࣑ᑋ࿤
ຊ㏷ჹᐁ㥺࡞࠽࠷࡙ࣄ࣭࣑ࡡᑋ࿤ࡢᐁ㥺ࡷῼᏽࢅ⾔࠹ࡒࡴ࡞ᚪさ࡝᫤㛣࡚࠵ࡾ࡛࡛ࡵ࡞ࠉࣄ࣭࣑ࡡᣪິࢅ▩ࡾࣂ࣒࣭ࣚࢰࡡ㸦ࡗ࡚ࡵ࠵ࡾࠊࣄ࣭࣑㌮㐠୕ࡡ┷✭ᅸ㸝ṟ⏻࢝ࢪᐠᗐ㸞࡛ࡡᩋ஗࡞ࡻࡖ࡙㉫ࡆࡾࣄ࣭࣑᥾኶ࡢࣄ࣭࣑ᑋ࿤࡞❻Ⓩ࡞ᙫ㡢ࡊࠉ࢙࣐ࢴࢰࣤࢪ࡝࡜ࣄ࣭࣑ᛮ⬗ࢅᕞྎࡌࡾኬࡀ࡝さᅄ࡛࡝ࡾࠊ
8187࡞࠽࠷࡙ࣄ࣭࣑෫༴ࠉ7+㞹ᅸ࡝࡜ࡡ⵫✒⢇Ꮔ࡫ࡡ࢙ࢾ࣭ࣜ࢟౩⤝࠿࡝࠷ሔྙࠉ㞹Ⲭ⛛⾔࡛ኣ㔔ᩋ஗࡞ࡻࡽࣄ࣭࣑ᩋ஗࠿࠽ࡆࡽࠉ⵫✒⢇Ꮔ࠿࢓ࢠࢬࣈ
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DC-CTᅒ㸧㸯┷✭ᅸῼᏽ⤎ᯕᖳ᭮ࡡ┷✭⣌㐘㌹㛜ጙ࠾ࡼࡡ྘├⥲㒂ࡡ┷✭ゝ ಴ ࡞ࡻࡾῼᏽࠊ㞹Ꮔࣄ࣭࣑෫༴

Schottky Monitorࢪ࠿↋࠷೩ྡྷ㒂࡞ࡢ㟸☚ᛮ3*,࣎ࣤࣈࢅ⏕࠷ࡾࡆ࡛࡚ゝ⟤࡚ࡢ5Fࢅᐁ⌟࡚ࡀࡾࠊ8187ࡡス⨠ࡈࡿ࡙࠷ࡾ࢕࢛ࣤ⥲ᙟຊ㏷ჹᐁ㥺Ჯ࡚ࡢᐄῺࢅ✒ᴗⓏ࡞ࢤࣤࢹ࣭ࣞࣜࡊ࡙࠷࡝࠷ࡒࡴᅒ㸧ࡡࡻ࠹࡞አẴῺ࡞ࡻࡖ࡙ᐄῺ࠿ኬࡀࡂን໩ࡊࠉ8187ࡡ┷✭ᅸࡢኬࡀࡂᙫ㡢ࡈࡿࡾࠊࡐࡡࡒࡴᐁ㥺࡞ࡻࡖ࡙ࡢᏒ⟿ࢅ㐽ࢆ࡚⾔࠹ᚪさ࠿࠵ࡾࠊࡊ࠾ࡊẴῺࡡ఩࠷᭿㛣ࡢ5F࡞฽㐡ࡊ࡙࠷ࡾࠉ

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Hࣄ࣭࣑ᑋ࿤ ȫ ࡢୖオࡡࡻ࠹࡞ᏽ⩇ࡈࡿࡾࠊ I t = I0 exp("t / # ) 
ࡆࡆ࡚.ࠉ .Wࡢῼᏽ㛜ጙ᫤࠽ࡻࡦ W᫤㛣ᚃࡡࣛࣤࢡ⵫✒㞹Ὦ࡚࠵ࡾࠊࡱࡒࠉ8187ࡡ࢓ࢠࢬࣈࢰࣤࢪࡡ
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4.1 ࣈࣞࢹࣤࣄ࣭࣑ᅒ㸩࡞㞹Ꮔࣄ࣭࣑෫༴ೳḾᚃ࡞)((9ࢅ⏕࠷࡙ῼᏽࡊࡒ⵫✒㞹Ὦ࠾ࡼゝ⟤ࡊࡒࣄ࣭࣑ᑋ࿤ࢅ♟ࡌࠊࣄ࣭࣑෫༴ೳḾᚃ࠾ࡼࡹࡖࡂࡽ࡛ᑋ࿤࠿ᝇ໩ࡊࠉ࠵ࡾ⛤ᗐ᫤㛣࠿⤊ࡗ࡛ࣄ࣭࣑ᑋ࿤ࡢ࡮࡯ୌᏽ࡛࡝ࡾࠊῼᏽ㛜ጙ᫤࡞ࡢ㞹Ꮔࣄ࣭࣑෫༴࡞ࡻࡽ࢙࣐ࢴࢰࣤࢪࡡ㟸ᖏ࡞ᑚࡈ࠷ࣄ࣭࣑࠿ῼᏽ㛜ጙ㸝෫༴ೳḾ㸞࡛ᙔ᫤ ࡞ ෫ ༴ ງ ࢅ ኶ ࠷ .QWUFGHFPVHFWWHULQJ ࡞ ࡻ ࡽ ࢙࣐ࢴࢰࣤࢪ࠿ቌኬࡊ࡙࠷ࡂࠊࡆࡡ㛣ࡵ㞹Ꮔ⛛⾔ࡷኣ㔔ᩋ஗ࡢ㉫ࡆࡖ࡙࠽ࡽࣄ࣭࣑᥾኶ࡊ࡙࠷ࡾ࠿ࠉ㟸ᖏ࡞Ⰳ࠷࢙࣐ࢴࢰࣤࢪࡡ࡛ࡀࡢ᥾኶ࡌࡾ࡛⩻࠻ࡼࡿࡾࣄ࣭࣑࿔㎰㒂࡞ࡢ⢇Ꮔ࠿ᑛ࡝ࡂ᥾኶ࡌࡾ⢇Ꮔᩐࡵᑛ࡝࠷ࡒࡴ㞹Ὦೋ࡚ࡲࡾ࡛ᑋ࿤ࡢⰃ࠷ࠊ࠵ࡾ⛤ᗐ᫤㛣࠿⤊ࡗ࡛.QWUFGHFPVHFWWHULQJ࡞ࡻࡽ࢙࣐ࢴࢰࣤࢪ࠿ቌኬࡊࠉࣄ࣭࣑හࡡ⢇Ꮔࡵ㏳ᖏࡡฦᕱ࡞࡝ࡽࣄ࣭
࣑ᑋ࿤࠿ୌᏽ࡛࡝ࡾ࡛⩻࠻ࡼࡿࡾࠊ@Bࡱࡒࠉࢨࣘࢴࢹ࣭࢞ࢿ࢕ࢫ࡞ࡻࡾ࿔ᅂ࿔ἴᩐࡡን໩㔖ῼᏽ࡞ࡻࡽࣄ࣭࣑࢙ࢾ࣭ࣜ࢟ࡡ᥾኶ࢅぜ✒ࡵࡾࡆ࡛࠿࡚ࡀࠉ'HWKH'ORHKࡡᘟࢅ⏕࠷࡙ࣄ࣭࣑㌮㐠୕ࡡ࢝ࢪᐠᗐࢅ⟤ฝ࡚ࡀࡾࠊ⾪㸦࡞྘ῼᏽ⤎ᯕࢅ♟ࡌࠊ┷✭ࢱࢠࢹහ࡚ࡡ༰ຊ㞹ᅸ࡞ࡻࡾᑚ㡷ᇡࡡ࢝ࢪᨲฝ࠿☔ヾࡈࡿ࡙࠷ࡾῼᏽ㸧ࢅ㝎ࡂῼᏽ࡚ࡢᐁῼೋ㸝⵫✒㞹Ὦࠉࣄ࣭࣑࢙ࢾ࣭ࣜ࢟ῼᏽ࠾ࡼࡡゝ⟤ೋ㸞ࡢゝ⟤ೋ㸝┷✭ᅸῼᏽ࠾ࡼࡡゝ⟤ೋ㸞ࡡ㸫๪࡮࡜ࡡೋ࡛࡝ࡖ࡙࠷ࡾࠊ@B-389-

Proceedings of the 5th Annual Meeting of Particle Accelerator Society of Japanand the 33rd Linear Accelerator Meeting in Japan (August 6-8, 2008, Higashihiroshima, Japan)⾪㸦㸯ࣈࣞࢹࣤࣄ࣭࣑ࡡᑋ࿤ῼᏽ⤎ᯕ✭ᅸῼᏽ࠾ࡼࡡゝ⟤ೋ㸞࡞Ẓ࡬ࡷࡷᑋ࿤ࡢ▯࠷ലྡྷࡢୌ⮬ࡊ࡙࠷ࡾࠊ ῼᏽ㸫ࠉ㸬࡞ࡗ࠷࡙ࡢᅒ㸪ࡡ࣭ࣝࢧ࣭෫༴⏕ࡡ㌮㐠⿭ḿࢪࣛࢴࢹࢅ⏕࠷࡙✒ᴗⓏ࡞㕼├᪁ྡྷ࢓ࣂ࣭ࢲࣔࢅ≻ࡂࡊ࡙ࣄ࣭࣑ᑋ࿤ࡡῼᏽࢅ⾔ࡖࡒࠊᅒ㸫ࡡࡻ࠹࡞ῼᏽ⤎ᯕࡢゝ⟤ೋࡡࣚ࢕ࣤ࡞Ἒ࠹࠿ࠉ࢓ࣂ࣭
ࢲࣔ࠿≻ࡂ࡝ࡾ࡞ᚉ࠷ゝ⟤ೋࡻࡽࡵᐁῼೋࡡᑋ࿤࠿
㛏ࡂ࡝ࡖࡒࠊ

Hࣄ࣭࣑ᑋ࿤ VHH⵫✒㞹Ὦῼᏽ࢙ ࢾ࣭ࣜ࢟ῼᏽ ┷✭ᅸῼᏽ ᅸງ5F ῼᏽ㸦 H ῼᏽ㸧 H ῼᏽ㸨 H ῼᏽ㸩 H 

4.2 Mgࣄ࣭࣑ 2Jࣄ࣭࣑ࡡᑋ࿤ῼᏽࡢࣈࣞࢹࣤࣄ࣭࣑࡛Ẓ㍉ࡊ⵫✒㞹Ὦ࠿ᑛ࡝ࡂ)((9࡚ࡢ᥆ῼ࡚ࡀ࡝࠷ࡒࡴ㟴㞹న⨠࣓ࢼࢰ࣭㞹ᴗᯀࢅ⏕࠷࡙ࣅࢴࢠ࢓ࢴࣈ㞹ᅸ࠾ࡼ⵫✒㞹Ὦῼᏽࢅ⾔ࡖࡒࠊࡱࡒࠉࣈࣞࢹࣤࣄ࣭࣑࡛ࡢ␏࡝ࡽࣛࣤࢡථᑏ࠾ࡼࣄ࣭࣑෫༴ࡢ⾔ࡖ࡙࠷࡝࠷ࠊ⾪㸧࡞ῼᏽ⤎ᯕࢅ♟ࡌࠊ㸪㸣⩻ᐳῼᏽᩐࡢᑛ࡝࠷࠿ࠉࣈࣞࢹࣤࠉ2Jࡡࣄ࣭࣑ᑋ࿤ࡡᐁῼೋࡢ࡛ࡵ࡞ゝ⟤ೋ࡞Ẓ࡬▯ࡂࠉࣈࣞࢹࣤࣄ࣭࣑ࡢࡐࡡലྡྷ࠿ᙁ࠷ࠊ┷✭ゝῼᏽೋ࡛ࣄ࣭࣑㌮㐠୕ࡡ┷✭ᅸࡢᑻᡜⓏ࡝࢝ࢪᨲฝ࡝࡜ࡵ࠵ࡽୌ⮬ࡊ࡝࠷ࡡࡢᙔ↓ࡓ࠿ࠉゝ⟤ೋ࡛ᐁῼೋ࡛ࡡᕣ࠿ࣈࣞࢹࣤࣄ࣭
⾪㸧㸯2Jࣄ࣭࣑ࡡᑋ࿤ῼᏽ⤎ᯕࣄ࣭࣑ᑋ࿤ VHH࣑ࡡ࡮࠹࠿᪺ࡼ࠾࡞ኬࡀ࠷ࡡࡢ⵫✒㞹Ὦࡡ㐢࠷࡞ࡻ
9XQH⵫✒㞹Ὦῼᏽ ┷✭ᅸῼᏽ ᅸງ5Fࡾࡵࡡ࡛᥆ῼࡌࡾࠊ௑ᅂࡡῼᏽ࡚ࡢࣈࣞࢹࣤࣄ࣭࣑ῼᏽ㸪 
 Hࡡ⵫✒㞹Ὦࡢࠤȣ&ࠉ2Jࡢᩐȣ&࡚࠵ࡾࠊࡱࡒࠉῼᏽ㸫 
 Hࣈࣞࢹࣤࣄ࣭࣑ࡢῼᏽ├๑࡞㞹Ꮔࣄ࣭࣑෫༴ࢅ⾔ࡖῼᏽ㸬  H࡙࠷ࡾࡆ࡛ࡵᙫ㡢ࡊ࡙࠷ࡾ࠾ࡵࡊࡿ࡝࠷ࠊ
2Jࣄ࣭࣑ᑋ࿤࡞࠽࠷࡙࢓ࣂ࣭ࢲࣔࡡኬࡀ࠷࡛ࡀࡢῼᏽ᫤᭿࠿␏࡝ࡾࡒࡴࢲ࣭ࣖࣤ࠽ࡻࡦῼᏽ┷✭ᅸࡢ㐢࠹࠿ࠉࣈࣞࢹࣤࣄ࣭࣑࡛ྜྷᵕ࡞ᐁῼೋ㸝⵫✒㞹Ὦࠉ ゝ⟤ೋ࡞ࡻࡂ࠵ࡖ࡙࠷ࡾࠊࡱࡒࠉ୕オᄿ㔔ᴗ࣏ࢡࢾࢴࢹన⨠࡚ࡡ࢓ࣂ࣭ࢲࣔโ㝀ࡵゝ⟤ೋ࡞㎾࠷ೋࢅࣄ࣭࣑࢙ࢾ࣭ࣜ࢟ῼᏽ࠾ࡼࡡゝ⟤ೋ㸞࠿ゝ⟤ೋ㸝┷ᚋ࡙࠷ࡾࠊࡊ࠾ࡊ࡝࠿ࡼ࢓ࣂ࣭ࢲࣔࡡ≻ࡂ࡝ࡾ࡛ゝ⟤ೋ࡞ྙࢂ࡝ࡂ࡝ࡾࠊࡆࡿࡢࣄ࣭࣑㌮㐠⿭ḿ࠿ᅒ㸪ࡡȭPPࢪࣛࢴࢹࢅ౐⏕ࡊ࡙࠷ࡾࡒࡴ࢓ࣂ࣭ࢲࣔ୯ᚨన⨠࡛ࡡㄏᕣ࠿ኬࡀࡂᙫ㡢ࡊ࡙࠷ࡾ࡛⩻࠻ࡼࡿࡾࠊ௑ᚃࡢᑛ⵫✒㞹Ὦࠉ࢓ࣂ࣭ࢲࣔࡡ≻࠷≟ឺࡷࢲ࣭ࣖࣤࡡ㐢࠷࡞ࡻࡾ2Jࣄ࣭࣑ᑋ࿤ῼᏽࡡࢸ࣭ࢰ⵫✒ࢅ⾔࠷㸨ḗඔ෫༴ᐁ㥺࡝࡜࡞ࡳࡄ࡙┷✭⣌࠽ࡻࡦࣄ࣭࣑ᑋ࿤ࡡᨭၻࢅ㐅ࡴࡒ࠷ࠊᅒ㸪㸯ࣄ࣭࣑࣭࣬ࣝࢧ࣭㌮㐠⿭ḿ⏕ࢪࣛࢴࢹࢪࢷࣤࣝࢪᯀ࡞⺧කᯀࠉȭPPࡡࢪࣛࢴࢹࢅスࡄ࡙࠷ࡾࠊ┷✭ࢱࢠࢹ୕ഁ࠾ࡼୖࢀࡊࠉ
ࢪࢷࣤࣝࢪᯀୖ㟻ࢅ⏕࠷࡙࢓ࣂ࣭ࢲࣔㄢᩒࢅ⾔࠹ࠊ&#()*+",!-.&,!-/012&"&56.7689.:;<6=;96>?@()3+",!-.!4-"/012&!

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A;?=8BC6>99@"'ཤ⩻ᩝ⊡[1] T. Shirai, et al., “One dimensional beam ordering of

protons in a storage ring”, Physical Review Letters,
98, p. 204801 2007
[2] M. Tanabe, et al., “Laser Cooling of Mg+ beam at SLSR”, Proc. of the 4th Annual Meeting ofPARTICLE ACCELERATOR SOCIETY of JAPAN,(2007) 118-120.
[3] H. Souda, et al., “Beam Optimization for Laser
Cooling at S-LSR”, Proc. of the 4th Annual Meetingof PARTICLE ACCELERATOR SOCIETY ofJAPAN, (2007) 327-329.
[4] H. Tongu, et al., “Present status of the Vacuum
System for S-LSR”, Proc. of the 1st Annual Meetingof PARTICLE ACCELERATOR SOCIETY ofJAPAN, (2004) 221-223.
[5] H. Tongu, et al., “Measurement of Beam Lifetime in
S-LSR”, Proc. of the 4th Annual Meeting ofPARTICLE ACCELERATOR SOCIETY of JAPAN,(2007) 324-326.

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