New Electrostatic Separator for K1.8 Beam Line Design Guideline - PowerPoint PPT Presentation

New Electrostatic Separator for K1.8 Beam Line Design Guideline ・ Radiation hardness ・ Reduce unexpected electric discharge Improvement and optimization on ... - Vacuum Chamber - Electrode - C.W. HV generator - Assembling Beam Instrumentation Workshop 2007.5.11 by M.Minakawa & M.Ieiri 1

Separator -1 真空容器 T1 p 平行電極(-)側 π - - ) 軽い粒子( K- 選択粒子(K - ) 磁場 電場 p-bar 重い粒子(p-bar) 平行電極(+)側 2

Separator -2 y = eEl 2 y ' = eEl pc β 2 pc β   Δ y ' = eEl 1 − 1 1 eEl 2 − m U ( ) 2 p 3 c 3 m W  ≈  pc 2 β W β U   E = 75 [kV /cm] y’ : π 25.08 [mr] l = 6 [m] K 25.92 [mr] p = 1.8 [GeV /c] p 28.19 [mr] π -K vertical displacement at MS : 3.5 [mm] 3

Separator -2 y = eEl 2 y ' = eEl pc β 2 pc β   Δ y ' = eEl 1 − 1 1 eEl 2 − m U ( ) 2 p 3 c 3 m W  ≈  pc 2 β W β U   E = 75 [kV /cm] y’ : π 25.08 [mr] longer l : Kaon decay l = 6 [m] K 25.92 [mr] larger E : stability, transmission efficiency p = 1.8 [GeV /c] p 28.19 [mr] sharp vertical image at MS : small acceptance (secondary beam intensity) π -K vertical displacement at MS : 3.5 [mm] 3

Separator -3 @K2 4

φ695.2 Drawing-out note Metal O-ring Electropolishing Buffing & φ800 Welding max. R11 Mechanical Buffing Rubber O-ring Vacuum Chamber-1 item KEK-PS J-PARC O.D. of Chamber JIS750-standard Junction of relieve local field branch pipes ≥ R30 reducing electric Polishing discharge Vacuum seal radiation-hard 5

Vacuum Chamber-2 6

Drawing-out Vacuum Chamber-2 6

five-face processing Drawing-out Vacuum Chamber-2 6

five-face processing Drawing-out Vacuum Chamber-2 6

KEK-PS J-PARC Smaller figure of Vacuum Chamber ( φ 800→φ695.2) ・Ceramic-base length：198mm→154mm ・Distance btwn Electrode & Chamber：115mm→76mm Electrode-1 7

(t=5, R1=3, R2=2 [mm]) Max. E：2.11×107 [V/m] Electric field around rim → Thickness and R of Anode(SUS) J-PARC (t=10, R1=8, R2=2[mm]) Max. E：1.63×107 [V/m] KEK-PS Electrode-2 Cathode Anode (Cathode-side) Gap for ES-field R1 Anode(SUS) t R2 8

Connection Electrode-3 K2 J-PARC 9

Connection Electrode-3 K2 J-PARC 9

J-PARC KEK-PS CW-HV Power supply -1 高電圧発生 装置本体 絶縁油 セラミック容器 電 圧 導 入 部 真空容器 負電極 10

J-PARC KEK-PS CW-HV Power supply -1 高電圧発生 装置本体 絶縁油 セラミック容器 電 圧 導 入 部 真空容器 負電極 10

J-PARC KEK-PS CW-HV Power supply -1 高電圧発生 装置本体 絶縁油 セラミック容器 電 圧 導 入 部 真空容器 負電極 10

CW-HV Power supply -2 11

CW-HV Power supply -2 11

CW-HV Power supply -2 ガス圧 - 耐電圧 特性曲線 印可電圧 [kV] 正極 06.01.05 400 正極 06.01.06 正極 06.01.10 正極 06.01.11 正極 06.01.12 負極 06.05.17 350 負極 06.05.19 負極 06.05.18 300 250 200 10 -5 10 -4 He-Ne ガス 導入圧力 [Torr] 11

Assembling-1 12

Assembling-1 12

Assembling-2 13

Assembling-3 14

Assembling-3 14

Assembling-3 14

Assembling-4 15

Assembling-4 15

Assembling-5 16

Assembling-6 17

Assembling-6 17

Assembling-6 17

真空容器・電極・高電圧発生装置を設計／製作 K1.8ビームライン用の6m長初段ESSの組上げ 設計の指針 放射線耐性 電界の緩和 今後 実機としての真空試験、電圧印可試験、連続運転試験 設置ベースの設計製作 二段目のESS(K6セパレータ)の整備 まとめ 18