⌫ᙧ✵Ὕᆺ䝟䝹䝇ᅽ⦰ჾ䛾〇స㻌FABRICATION OF A SPHERICAL-CAVITY-TYPE PULSE COMPRESSORబ἞ ᫭ᘯ#, A), ஭ཎ ຌ௓ A), 㔝ᮧ ఀஂ☻ A),⫧ᚋ ኖὈ B), ᝴㒓 ༤ᩥ B, C), 㜿㒊ဴ㑻 B), ᮾ ಖ⏨ B) ,ᆏᮾ భᫍ C), ᯘ ᱮᙬ D), ᪋჆൲ D)
Akihiro Saji #, A), Kousuke Ihara A), Ikuma Nomura A),B)
Toshiyasu Higo , Hiroyasu Ego B, C), Yasuo Higashi B), Yusei Bando C), Xiancai Lin D), Jiaru Shi D)A)Toyama Co., Ltd.
B)
High Energy Accelerator Research Organization, KEKC)
Graduate University for Advanced StudiesD)
Tsinghua UniversityAbstract
A spherical-cavity-type pulse compressor (SCPC) is more compact than a SLAC Energy Doubler (SLED) and comprises
a single spherical cavity and a waveguide polarizer. Based on the S-band SCPC developed in Tsinghua University (China),
we designed a SCPC capable of high power operation in the KEK e-/e+ LINAC and compatible with the currently running
SLED. A prototype SCPC was manufactured to establish machining, brazing and tuning. It achieved the proper RF
properties and a robust body for the high power operation. We report in this paper the fabrication of the SCPC, focusing
on the assembly method and brazing procedure.

㻝㻚㻌ᗎㄽ㻌㧗࿘Ἴ䝟䝹䝇ᅽ⦰ჾ䛿ຍ㏿⟶䛻ධຊ䛩䜛 RF 䝟䝽䞊䜢ቑ኱䛥䛫䜛䛯䜑䛻⏝䛔䜙䜜䜛䚹SLAC 䛷㛤Ⓨ䛥䜜䛯ᚑ᮶䛾䝅䝸䞁䝎䞊ᙧ≧䛾 2 ✵Ὕᆺ䛾䜒䛾䛸ẚ㍑䛧䛶[1]䚸⌫ᙧ✵Ὕᆺ䝟䝹䝇ᅽ⦰ჾ䛿ඹ᣺㒊䛜 1 䛴䛾⌫య䛷䛒䜛䛯䜑㠀ᖖ䛻䝁䞁䝟䜽䝖䛻䛺䜛䚹S 䝞䞁䝗䛾⌫ᙧ✵Ὕᆺ䝟䝹䝇ᅽ⦰ჾ䛿Ύ⳹኱Ꮫ䛷㛤Ⓨ䛥䜜䛶ᐇ㦂ᐊ䝺䝧䝹䛷✌ാ䛧䛶 䛔 䜛 ᐇ ⦼ 䛜 䛒 䜛 [2] 䚹 KEK 䛿 䚸 䛣 䛾 䝰 䝕 䝹 䜢 ᇶ 䛻SuperKEKB 䛾㧗䛔Ᏻᐃᛶ䛸㧗⧞㏉䛧䛻ᑐᛂ䛷䛝䜛䜘䛖䛻タィ䛧┤䛧䛶[3]䚸KEK 㟁Ꮚ㝧㟁Ꮚධᑕჾ䛷✌ാ䛧䛶䛔䜛᪤Ꮡ䛾 2 ✵Ὕᆺ䛾䜒䛾䛸⨨᥮䛘ྍ⬟䛺䝟䝹䝇ᅽ⦰ჾ䛸䛧䛶〇స䛧䚸┠ᶆ䛾㟁Ẽⓗ≉ᛶ䜢ᚓ䛯[4]䚹⌧ᅾ䚸኱㟁ຊヨ㦂䛜⾜䜟䜜䛶䛔䜛[5]䚹ᮏ✏䛷䛿䚸䝥䝻䝖䝍䜲䝥⌫ᙧ✵Ὕᆺ䝟䝹䝇ᅽ⦰ჾ䛻䛚䛡䜛〇స㐣⛬䛷䛾䝟䞊䝒䛾⤌❧᪉ἲ䜔᥋ྜせ㡿䜢୰ᚰ䛻〇స᪉ἲཬ䜃䛭䛾⤖ᯝ䜢ሗ࿌䛩䜛䚹㻞㻚㻌ᶵᲔタィ㻌௒ᅇ㛤Ⓨ䛧䛯⌫ᙧ✵Ὕᆺ䝟䝹䝇ᅽ⦰ჾ䛷䛿䚸ᑠᆺ㍍㔞໬䛻䜘䜛䝁䝇䝖䝎䜴䞁䛾䜋䛛䚸⤌❧䜰䝷䜲䝯䞁䝖䛾෌⌧ᛶ䛜㧗䛟ୟ䛴᥋ྜ⟠ᡤ䛜ῶ䜛䜘䛖䛻䚸ᵓᡂ㒊ရⅬᩘ䜢ῶ䜙䛩஦䜢䝁䞁䝉䝥䝖䛸䛧䛶タィ䛧䛯䚹䛣䛾⌫ᙧ✵Ὕᆺ䝟䝹䝇ᅽ⦰ჾ䛾ᴫほᅗ䜢 Fig. 1 䛻♧䛩䚹୺せ㒊ရ䛿䚸༙⌫ 2䜿䚸Ỉ㊰⵹ 2 䜿䚸ᑟἼ⟶೫ᴟჾ䠄ᮏయཬ䜃⵹䠅䚸ཬ䜃 RF䝏䝳䞊䝘䞊䛷䛒䜚䚸඲㔜㔞䛿 150 kg ⛬ᗘ䛷䛒䜛䚹ඹ᣺㒊䛾⌫ᙧ✵Ὕ䛿䚸୰䛠䜚䛷ຍᕤ䛷䛥䜜䜛༙⌫ 2 䜿䜘䜚ᙧᡂ䛩䜛䚹⦰㏥䛩䜛 2 䛴䛾 90 ᗘ఩┦䛾䛪䜜䛯ඹ᣺䝰䞊䝗䛿༙⌫᥋ྜ㒊䜢㐣䜛㟁ὶ䜢ᣢ䛴䛾䛷䚸䛣䛾᥋ྜ㒊䛿㟁Ẽⓗ䛻Ⰻዲ䛺᥋ゐ䛜せồ䛥䜜䜛䚹⌫ᙧ✵Ὕ䛸ᑟἼ⟶೫ᴟ___________________________________________# saji@toyama-jp.comჾ䜢᥋⥆䛩䜛෇⟄ᑟἼ⟶䛿䚸⤖ྜᏍഃ䛾⌫ᙧ✵Ὕ༙⌫䛸୍యᵓ㐀䛻䛧䛯䚹ᑟἼ⟶೫ᴟჾ䛿 X Ꮠᆺ 3dB 䝝䜲䝤䝸䝑䝖䛾୰ኸ䛻෇⟄ᑟἼ⟶䜢᥋⥆䛩䜛ᵓ㐀䛷䛒䜛䚹RF Ⓨ⇕ศᕸ䛿ᒁᡤⓗ䛻㧗䛔⤖ྜᏍ㏆ഐ䜢㝖䛡䜀඲యⓗ䛻䛿䜋䜌ᆒ୍䛷䛒䜛䛾䛷䚸✵Ὕෆ㠃䛾㏆䛟䛻䝞䝷䞁䝇Ⰻ䛟Ỉ㊰䜢㓄⨨䛧䛯[6]䚹ලయⓗ䛻䛿⌫ᙧ✵Ὕ୰ኸ௜㏆䛻
RF 䝏䝳䞊䝘䞊䜢㑊䛡䛶ᆒ➼䛻 16 ᮏ䛾୺⣔⤫䃥10 Ỉ㊰䛻ຍ䛘䛶䚸Ⓨ⇕㔞䛾኱䛝䛔⤖ྜᏍ㏆ഐ䜢ྵ䜐୧ᴟ㒊䛻
ྛ 2 ิ䛾࿘ᅇ䛩䜛Ỉ㊰䜢㓄⨨䛧䛶෭༷ຠ⋡䜢㧗䜑䛯䚹✵Ὕ䛾ඹ᣺䜢እ䛩䝕䜱䝏䝳䞊䝘䞊⏝䝫䞊䝖䝣䝷䞁䝆䛻䛿䚸㖡䜺䝇䜿䝑䝖 1 ᯛ䛷┿✵䝅䞊䝹ཬ䜃 RF 䝅䞊䝹䛜䛷䛝䜛MO 䝣䝷䞁䝆䜢᥇⏝䛧䛯[7]䚹RF 䝏䝳䞊䝘䞊䛿༙⌫᥋ྜ㠃䛛䜙㏆䛔఩⨨䛻ᑐ⛠䛻ィ 8 䛛ᡤタ⨨䛧䛯䚹0.05 mm ௨ୗ䛾ศゎ⬟䛜せồ䛥䜜䜛䛾䛷䚸㏦䜚䛽䛨ᶵᵓ䛸䛧䛯䚹(a)(b)

䝕䜱䝏䝳䞊䝘䞊⏝䝫䞊䝖䝣䝷䞁䝆Ỉ㊰⵹⌫ᙧ✵Ὕ༙⌫
䠄䝕䜱䝏䝳䞊䝘䞊ഃ䠅RF 䝏䝳䞊䝘䞊
⌫ᙧ✵Ὕ༙⌫䠄⤖ྜᏍഃ䠅Ỉ㊰⵹ᑟἼ⟶೫ᴟჾ
ᑟἼ⟶೫ᴟჾᮏ

Figure 1: (a) Schematic view and (b) a part of crosssectional view of the spherical-cavity-type pulse
compressor (SCPC).㻟㻚〇స

3.1〇సᡭ㡰ཬ䜃ᴫせ௒ᅇ䛾䝥䝻䝖䝍䜲䝥ᶵ〇స䛷䛿䚸⌫ᙧ✵Ὕ䜔ᑟἼ⟶➼䛾㖡ᮦ䛻䛿↓㓟⣲㖡 2 ✀䠄C1020䠅䜢⏝䛔䚸䛭䛾௚䝣䝷䞁䝆䜔෭༷䝟䜲䝥➼䛾ᮦ㉁䛻䛿 SUS304 䜢⏝䛔䛯䚹୺せ㒊ရ䛾ᶵᲔຍᕤ䛻䛴䛔䛶䛿(ᰴ)䜸䜸䝒䜹䛜⾜䛔䚸䛭䜜௨እ䛾〇స䛻䛴䛔䛶䛿(ᰴ)䝖䝲䝬䛜⾜䛳䛯䚹୺せ㒊ရ䛾᥋ྜᡭἲ䛻䛿䚸᥋ྜ㠃䛾ᐦ╔ᛶ䛜㧗䛔䛯䜑䚸Q ್䛾ຎ໬䛜ᑡ䛺䛟䚸ᒁᡤⓗ䛺⇕ኚᙧ䛜⏕䛨䛻䛟䛔┿✵䝻䜴௜䛡䜢⏝䛔䛯䚹䝕䜱䝏䝳䞊䝘䞊⏝䝫䞊䝖䝣䝷䞁䝆䛾᥋ྜ䛻䛴䛔䛶䛿䚸┿✵䝅䞊䝹䜶䝑䝆䛜㌾໬䛫䛼䜘䛖䛻䝻䜴௜䛡ᚋ䛻 TIG㻌 (Tungsten Inert Gas)⁐᥋䛷⾜䛳䛯䚹䜎䛯ᕤ⛬ẖ䛻 RF ᐃ䜢⾜䛔䚸ྛ〇సᕤ⛬䛻䜘䜛ప㟁ຊ RF ≉ᛶ䜈䛾ᙳ㡪䛾ᢕᥱ䛻ດ䜑䛯䚹௨ୗ䛻〇సᡭ㡰䜢♧䛩䚹

(a)

(b)

Figure 2: Water-channel side of medium-machined
hemispheres (a) with a detuner port and (b) with a couplingport.

1.
2.
3.
4.
5.
6.

୸Წษ᩿Ⲩຍᕤ
୰௙ୖຍᕤ
500䉝䜰䝙䞊䝹 䠄⌫ᙧ✵Ὕ༙⌫䛾䜏ᐇ᪋䠅௙ୖຍᕤ 䠄⌫ᙧ✵Ὕෆ㠃䛸༙⌫᥋ྜ㠃䠅䝻䜴௜䛡 1 䠄⌫ᙧ✵Ὕ༙⌫䚸Ỉ㊰⵹䚸෭༷䝟䜲䝥䛻䜘䜛✵Ὕᙧᡂ䠅
7. 䝻䜴௜䛡 2㻌 䠄ᑟἼ⟶೫ᴟჾ䛾༢య⤌❧䠅
8. 䝻䜴௜䛡 3㻌 䠄✵Ὕ䛸ᑟἼ⟶೫ᴟჾ䚸䝕䜱䝏䝳䞊䝘䞊⏝䝫䞊䝖䛾⤌❧䠅
9. 䝕䜱䝏䝳䞊䝘䞊⏝䝫䞊䝖䝣䝷䞁䝆䛾 TIG ⁐᥋
10. RF 䝏䝳䞊䝙䞁䜾3.2

㒊ရ〇స䛸ホ౯ඹ᣺✵Ὕ༙⌫䛿௙ୖຍᕤ๓䛻 500䉝䜰䝙䞊䝹ฎ⌮䜢᪋䛧䛯䚹䛭䛾ᚋኚᙧ䛜⏕䛨䛺䛔䜘䛖䛻䜽䝷䞁䝥ᙧ≧䛾ᑓ⏝἞ල䜢⏝䛔䛶䝏䝱䝑䜻䞁䜾䛧䚸䝎䜲䝲䝰䞁䝗䝞䜲䝖䛻䛶⢭ᐦ᪕┙䛻䜘䜛ຍᕤ䛷௙ୖ䛯䚹௙ୖຍᕤ䛾ษ๐௦䛿ከ
0.2 mm 䜎䛷ᑡ䛺䛟䛧䛯䚹௙ୖຍᕤ๓䛾 RF ᐃ䛾⤖ᯝ䜘䜚䚸ຍᕤ䛷䛾᭱⤊ษ๐௦䜢ṧ䛩䛯䜑䚸┠ᶆ䛸䛩䜛⤖ྜᗘǃ 䜘䜚ⱝᖸᑠ䛥䛟䛺䜛䜘䛖䛻䚸⤖ྜᏍ┤ᚄ䜢ᮏ᮶䛾タィ್
䜘䜚 0.2 mm ᑠ䛥䛟௙ୖ䛢䛯䚹௙ୖຍᕤᚋ䛾✵Ὕ䛾ඹ᣺࿘Ἴᩘ䛿タィ್䛻ᑐ䛧䛶 50 kHz ⛬ᗘప䛔⛬ᗘ䛷䛒䜚䚸
⦰㏥䛩䜛 2 䛴䛾䝰䞊䝗䛾ඹ᣺࿘Ἴᩘᕪ䛿 5 kHz ⛬ᗘ䛷䛒䛳䛯䚹䛣䛾᫬Ⅼ䛷༑ศ䛺ప㟁ຊ RF ≉ᛶ䜢ᚓ䛯䛾䛷䚸⤖ᯝⓗ䛻༙⌫᥋ྜ㠃䜎䛯䛿༙⌫ෆ㠃䛻᪋䛩ணᐃ䛰䛳䛯ඹ᣺࿘Ἴᩘ䜢⿵ṇ䛩䜛䛯䜑䛾 RF ㄪᩚຍᕤ䜢ᐇ᪋䛧䛺䛛䛳䛯䚹༙⌫ෆ㠃䛾㍯㒌ᗘ䛿 20 Ǎm䚸༙⌫᥋ྜ㠃䛾ᖹ㠃ᗘ䛿 10 Ǎm ௨ୗ䛸䛺䜛䜘䛖䛻ຍᕤ䛧䚸CMM ᐃ䛷☜ㄆ䛧䛯䚹⌫ᙧ✵Ὕෆ㠃䛾⾲㠃⢒ᗘ䛿┤᥋ ᐃ䛧䛶䛔䛺䛔䛜䚸䝔䝇䝖䝢䞊䝇䛾ຍᕤ⤖ᯝ䜘䜚 Rz1.5 Ǎm ௨ୗ䛻䛺䛳䛶䛔䜛䛸ᛮ䜟䜜䜛䚹௙ୖຍᕤ๓䛾䝕䜱䝏䝳䞊䝘䞊ഃ⌫ᙧ✵Ὕ༙⌫ཬ䜃⤖ྜᏍഃ⌫ᙧ✵Ὕ༙⌫䛾෗┿䜢 Fig. 2 䛻♧䛩䚹௙ୖຍᕤᚋ䛾䝕䜱䝏䝳䞊䝘䞊ഃ⌫ᙧ✵Ὕ༙⌫䛾ෆ㠃ഃ෗┿䜢 Fig. 3 䛻♧䛩䚹

Figure 3: Inner surface of the machined hemisphere withthe detuner port.
3.3⤌❧ཬ䜃᥋ྜ୺せ㒊ရ䛿㔜㔞≀䛷䛒䜚 30 kg 䜢㉸䛘䜛䜒䛾䜒ྵ䜎䜜䜛䛾䛷䚸യ䜔ᡴ⑞䛜௜䛛䛼䜘䛖䛻ៅ㔜䛻⤌❧䛶䛯䚹⌫ᙧ✵Ὕ༙⌫䚸ᑟἼ⟶೫ᴟჾ䛾䜰䝷䜲䝯䞁䝖䛻䛿⤌❧⢭ᗘཬ䜃෌⌧ᛶ䛜༑ศ☜ಖ䛷䛝䜛䜘䛖䛻఩⨨Ỵ䜑䝢䞁䛷⾜䛳䛯䚹┿✵䝻䜴௜䛡䛻䜘䜛᥋ྜ䛻䛴䛔䛶䛿ᐇయ ᗘ䜢 ᐃ䛧䛺䛜䜙ィ 3 ᅇ䛻ศ䛡䛶⾜䛳䛯䚹༙⌫䚸Ỉ㊰⵹ཬ䜃෭༷䝟䜲䝥䛻䜘䜚✵Ὕ䜢ᙧᡂ䛩䜛䝻䜴௜䛡䛸ᑟἼ⟶೫ᴟჾ䜢༢య⤌❧䛩䜛䝻䜴௜䛡䛷䛿䚸⃿䜜ᛶ䛜㧗䛟䚸䜎䛯ᾮ┦Ⅼ䛸ᅛ┦Ⅼ䛜➼䛧䛔㖟䝻䜴ᮦ BAg-8 䜢౑⏝䛧䛯䠄Fig. 4䠅䚹✵Ὕ䚸ᑟἼ⟶೫ᴟჾཬ䜃䝕䜱䝏䝳䞊䝘䞊⏝䝫䞊䝖䜢᥋ྜ䛩䜛඲య⤌❧䛾䝻䜴௜䛡䛷䛿䚸䜲䞁䝆䜴䝮䜢ྵ䜏ᾮ┦Ⅼ䛾ప䛔㖟䝻䜴ᮦ TK-671 䜢౑⏝䛧䛯䠄Fig. 5䠅䚹䝻䜴௜䛡㠃䛾㠃✚䜔䜼䝱䝑䝥䜢⪃៖䛧䛶䝻䜴ᮦ䛾㔞䜔⁁㓄⨨䜢Ỵᐃ䛧䛯䚹䛥䜙䛻༙⌫ྠኈ䛾᥋ྜ䛻䛴䛔䛶䛿䚸ᐇᶵ䛸ྠ䛨᥋ྜ㠃䜢ᣢ䛴䝔䝇䝖䝢䞊䝇䜢⏝䛔䛶᝿ᐃ䛩䜛᥋ྜ ᗘ䛸Ⲵ㔜᮲௳䛷䝻䜴௜䛡ヨ㦂䜢ᐇ᪋䛧䚸✵Ὕෆ㠃ቃ⏺䜎䛷䝻䜴䛜ᾐ䜏ฟ䛥䛪䛻䛭䛾㏆ഐ䛷ᐦ䛻୍య໬䛩䜛᮲௳䜢☜❧䛧䛯䚹䝻䜴௜䛡䝔䝇䝖䝢䞊䝇᩿㠃䛾ᣑ኱⏬ീ䜢 Fig. 6 䛻♧䛩䚹
䛣䜜䜙 3 ᅇ䛾䝻䜴௜䛡䛻䜘䜚⌫ᙧ✵Ὕᆺ䝟䝹䝇ᅽ⦰ჾ䛾ᙧᡂ䜢䛧䛯䚹ᐇᶵ䛻䛚䛔䛶䜒✵Ὕෆ㠃ቃ⏺䛻䚸䝻䜴䛾ᾐ䜏ฟ䛧ཬ䜃㝽㛫䛜↓䛔䛣䛸䜢䜹䝯䝷⏬ീ䛷☜ㄆ䛧䛯䚹䝻䜴௜䛡ᚋ䛻⾜䛳䛯㏻Ỉヨ㦂䛷䛿䚸ྛỈ㊰䛻つᐃ䛾 2ಸ⛬ᗘ䛾ὶ㔞䛷㏻Ỉ᫬䛾ྛᅽᦆ್ྜィ䛿 0.4 MPa ⛬ᗘ䛷䛒䛳䛯䚹䜘䛳䛶᪤ᐃὶ㔞䛷䛾ᅽᦆ䛿༑ศప䛟䛺䜛ぢ㎸䜏䛷䛒䜛䚹ྛ✀ヨ㦂᳨ᰝᚋ䛻ᯫྎ䛻ᤣ䛘௜䛡䛯䝟䝹䝇ᅽ⦰ჾ䛾෗┿䜢 Fig. 7 䛻♧䛩䚹

3.4(a)(b)

Figure 4: Fabrication of (a) the spherical-cavity and (b) theRF waveguide polarizer by brazing.

Figure 5: SCPC before final brazing.

ᑐ≀5✵Ὕෆ㠃ቃ⏺㒊RF 䝏䝳䞊䝙䞁䜾〇సㄗᕪ䛻ຍ䛘䛶ᐃᖖ㐠㌿᫬䛾⇕ኚᙧ䛻䜘䜛ඹ᣺࿘Ἴᩘኚ໬䜢⿵ṇ䛩䜛䛯䜑䛻䚸ྛ䝰䞊䝗䛻ᑐ䛧䛶 200 kHz⛬ᗘ䛾࿘Ἴᩘㄪᩚ䜢 8 䜿䛾 RF 䝏䝳䞊䝘䞊䛷⾜䛖䚹䝻䜴௜䛡ᚋ䚸✵Ὕ䛾ඹ᣺࿘Ἴᩘ䛿タィ್䜘䜚 10 kHz ⛬ᗘ㧗䛔್䛻䛺䛳䛯䚹ᐇᶵ䛾䝏䝳䞊䝙䞁䜾䛿[4]䛻ヲ䛧䛟ሗ࿌䛥䜜䜛䚹䛣䛣䛷䛿䝥䝻䝖䝍䜲䝥ᶵ䛸ྠᙧ≧䛾ヨ㦂⏝༙⌫䜢⏝䛔䛯 RF 䝏䝳䞊䝘䞊䛻䜘䜛䝕䜱䞁䝥䝸䞁䜾㔞䛾ホ౯䛸䚸ヨ㦂⏝༙⌫ 2 䜿䜘䜚ᙧᡂ䛧䛯✵Ὕ䛻⥺ᙧ೫ᴟ䝰䞊䝗ኚ᥮ჾ䜢ྲྀ௜䛡䛶䚸㑅ᢥⓗ䛻ྲྀ䜚ฟ䛧䛯ྛ䝰䞊䝗䛾䝕䜱䞁䝥䝸䞁䜾䛻క䛖ඹ᣺࿘Ἴᩘኚ໬䛾ホ౯䜢ሗ࿌䛩䜛䚹1.2 mm ⛬ᗘᢲ䛧ᘬ䛝䛧䛯≧ែ䛷䛾༙⌫ෆ㠃䛾䝕䜱䞁䝥䝸䞁䜾㊧䛾෗┿䜢 Fig. 8 䛻♧䛧䚸CMM ᐃ䛻䛶ྲྀᚓ䛧䛯䝕䜱䞁䝥䝸䞁䜾㒊䛾᩿㠃䝥䝻䝣䜯䜲䝹䜢 Fig. 9 䛻♧䛩䚹䛣䛾᩿㠃䝥䝻䝣䜯䜲䝹䛻♧䛧䛯ᢲ䛧ᘬ䛝䛾ኚ໬㔞䛿䚸ඹ᣺✵Ὕ༙⌫䛾እᙧ䜘䜚ᐇ 䛧䛯䝏䝳䞊䝘䞊✰῝䛥䛾ኚ໬㔞ཬ䜃 RF䝏䝳䞊䝘䞊㏦䜚䛽䛨䛾ᅇ㌿ᩘ䜘䜚⟬ฟ䛧䛯䛽䛨㐍䜏㔞䛸䜘䛟୍⮴䛧䛶䛔䛯䚹1 䜿䛾 RF 䝏䝳䞊䝘䞊䜢 1.2 mm ⛬ᗘ䜎䛷ᘬ䛟ヨ㦂䛻䛚䛔䛶䚸ඹ᣺࿘Ἴᩘ䛜䝏䝳䞊䝘䞊䛾ື䛝䛻ᑐ䛧䛶ᴫ䛽ẚ౛䛧䛶 50 kHz ⛬ᗘ䜎䛷పୗ䛧䛯䚹䝰䞊䝗ኚ᥮ჾ䜢 90 ᗘᅇ㌿䛩䜛䛸࿘Ἴᩘኚ໬䛿↓䛟䚸⦰㏥䛜ゎ䛛䜜䛯䠄Fig. 10䠅䚹௨ୖ䛾⤖ᯝ䜘䜚䚸࿘Ἴᩘㄪᩚ㔞䛿 8 䜿
䛾 RF 䝏䝳䞊䝘䞊䛷༑ศ䛻☜ಖ䛥䜜䜛䛣䛸䚸RF 䝏䝳䞊
䝘䞊䛾㏦䜚䛽䛨ᅇ㌿ᩘ䛻㏣ᚑ䛧䛶༙⌫ෆ㠃䛜ᴫ䛽᝿ᐃ
㏻䜚䛻ኚᙧ䛩䜛䛸ඹ䛻┦ᛂ䛻䝕䜱䞁䝥䝸䞁䜾䛩䜛᪉ྥ䛻ᴟᛶ䜢ᣢ䛴䝰䞊䝗䛾ඹ᣺࿘Ἴᩘ䛜ኚ໬䛩䜛䛣䛸䜢☜ㄆ䛧䛯䚹䛭䛾ᚋ䚸䝥䝻䝖䝍䜲䝥ᶵ䛻⿦╔䛩䜛ᐇᶵ䝏䝳䞊䝘䞊䛻䛴䛔䛶䛿⿦╔䛾ᐜ᫆䛥䜔䚸䝛䝆䛾䜺䝍䛴䛝䜔䝞䝑䜽䝷䝑䝅䝳䜢ῶ䜙䛩➼䛾ᨵⰋ䜢ຍ䛘䛯䚹
(a)

(b)

᥋ྜ㠃

Figure 6: Cross-section of the test piece after brazing.

Figure 8: Inside of the sample hemisphere (a) after pullingby 1.2 mm and (b) after pushing by 1.2 mm using the RFtuner.
-5

beforer tuning
after pulling
after pushing

Distance z [mm]-10-15-20-25

1.2 mm-30-35

1.2 mm-40
120

Figure 7: SCPC after brazing and dimple tuning.

122

124
126
Distance x [mm]128

Figure 9: Cross-section profile of the sample hemisphere
after dimpling.Frequency shift [MHz]100-10-20-30-40-50-60ཧ⪃ᩥ⊩[1] Z. D. Farkas, H. A. Hoag, G. A. Loew and P. B. Wilson,“SLED: A Method of Doubling SLAC’s Energy”, SLACPUB-1453, 1974.
[2] Wang Ping et al. “Development of an S-band spherical pulse
compressor”, Nuclear Instruments and Methods in Physics
0 deg
Research Section A: Accelerators, Spectrometers, Detectors
and Associated Equipment 901 (2018): 84-91.
90 deg[3] T. Higo et al., “Design of S-band spherical-cavity-type pulse
compressor for SuperKEKB”, FRPP39, Proceedings of the00.4
0.8
1.2
1.6
17th Annual Meeting of Particle Accelerator Society ofPulling distance [mm]Japan, Japan, Sep. 2-4, 2020.
Figure 10: Frequency shifts of the spherical test cavity by [4] T. Higo et al., “RF characteristics view of construction ofspherical-cavity-typepulsecompressor”,
TUP045,pulling.
Proceedings of the 18th Annual Meeting of Particle
Accelerator Society of Japan, Japan, Aug. 9-12, 2021.
㻠㻚㻌 䜎䛸䜑㻌
[5]㻌 Y. Bando et al., “High power test of S-band spherical-cavity
type pulse compressor”, WEOB06, Proceedings of the 18thSuperKEKB 䛷౑⏝䛩䜛䛯䜑䛾⌫ᙧ✵Ὕᆺ䝟䝹䝇ᅽAnnual Meeting of Particle Accelerator Society of Japan,⦰ჾ䛾䝥䝻䝖䝍䜲䝥ᶵ䛾〇స䜢⾜䛔䚸䛭䛾ヲ⣽䜢ሗ࿌䛧Japan, Aug. 9-12, 2021.
䛯 䚹 ᶵ Ე ຍ ᕤ 䛸 䝻 䜴 ௜ 䛡 ⤌ ❧ 䛿 ၥ 㢟 䛺 䛟 㐍 䜏 䚸 ᭱ ⤊ [6] A. Saji et al., “Thermal analysis of a spherical-cavity-type
pulse compressor for the SuperKEKB project”, THPP39,䝏䝳䞊䝙䞁䜾䜢ᚓ䛶䜋䜌タィ್㏻䜚䛾ప㟁ຊ RF ≉ᛶ䜢Proceedings of the 17th Annual Meeting of Particleᚓ䜛஦䛜䛷䛝䛯䚹⌧ᅾ䚸኱㟁ຊヨ㦂䛿㡰ㄪ䛻㐍⾜୰䛷Accelerator Society of Japan, Japan, Sep. 2-4, 2020.
䛒䜛䚹䛣䜜䜎䛷䛻ᐃ᱁䛾༙ศ䛻䛒䛯䜛 20 MW 䛾 RF ධຊ [7] H. Matsumoto and M. Ohtsuka, in Proceedings of the 24th
Linear Accelerator Meeting in Japan, Sapporo, 7–9 July,䝟䝽䞊䛷䝟䝹䝇ᅽ⦰䛜ṇᖖ䛻⾜䜟䜜䛶䛔䜛䛣䛸䜢☜ㄆ䛧䚸
1999, p. 271.
┠ㄽ䜣䛷䛔䛯㟁Ẽⓗ≉ᛶ䜔෭༷ᛶ⬟䜢ᐇド䛷䛝䛯䚹௒ᅇ䛾〇స䛷⌫ᙧ✵Ὕᆺ䝟䝹䝇ᅽ⦰ჾ䛾〇సせ㡿䜢☜❧䛧䛯䚹ㅰ㎡KEK 䛷⾜䛳䛯ྛ✀ホ౯䛾ᵝ䚻䛺ሙ㠃䛻䛚䛔䛶䚸୕⳻㟁ᶵ䝅䝇䝔䝮䝃䞊䝡䝇(ᰴ)䛾∵ᮏẶ䛻䛿኱ኚ䛺䛤ᑾຊ䜢㡬䛝䜎䛧䛯䚹῝䛟ឤㅰ䛔䛯䛧䜎䛩䚹