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

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

Mar 08, 2024 527 likes •869 views

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

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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

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平行電極(-)側 平行電極(+)側 磁場 電場 重い粒子(p-bar) 選択粒子(K-) 軽い粒子(

  • )

真空容器

Separator -1

π- K- p-bar p T1

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SLIDE 3

Separator -2

y = eEl2 2pcβ

y' = eEl pcβ

Δy' = eEl pc 1 βW − 1 βU       ≈ 1 2 eEl p3c 3 mW

2 − mU 2

( )

E = 75 [kV /cm] l = 6 [m] p = 1.8 [GeV /c] y’ : π 25.08 [mr] K 25.92 [mr] p 28.19 [mr] π-K vertical displacement at MS : 3.5 [mm]

3

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SLIDE 4

Separator -2

y = eEl2 2pcβ

y' = eEl pcβ

Δy' = eEl pc 1 βW − 1 βU       ≈ 1 2 eEl p3c 3 mW

2 − mU 2

( )

E = 75 [kV /cm] l = 6 [m] p = 1.8 [GeV /c] y’ : π 25.08 [mr] K 25.92 [mr] p 28.19 [mr] π-K vertical displacement at MS : 3.5 [mm]

longer l : Kaon decay larger E : stability, transmission efficiency sharp vertical image at MS : small acceptance (secondary beam intensity)

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SLIDE 5

Separator -3

@K2

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SLIDE 6

item

O.D. of Chamber Junction of branch pipes Polishing Vacuum seal

KEK-PS

φ800 Welding

  • max. R11

Mechanical Buffing Rubber O-ring

J-PARC

φ695.2 Drawing-out ≥R30 Buffing & Electropolishing Metal O-ring note

JIS750-standard relieve local field reducing electric discharge radiation-hard

Vacuum Chamber-1

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SLIDE 7

Vacuum Chamber-2

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SLIDE 8

Vacuum Chamber-2

Drawing-out

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SLIDE 9

Vacuum Chamber-2

Drawing-out five-face processing

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SLIDE 10

Vacuum Chamber-2

Drawing-out five-face processing

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Electrode-1

KEK-PS J-PARC Smaller figure of Vacuum Chamber (φ800→φ695.2) ・Ceramic-base length：198mm→154mm ・Distance btwn Electrode & Chamber：115mm→76mm

7

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SLIDE 12

Electrode-2

KEK-PS (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]

R1 R2 t Anode(SUS) (Cathode-side) Gap for ES-field

Cathode Anode

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SLIDE 13

Electrode-3

Connection

K2 J-PARC

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SLIDE 14

Electrode-3

Connection

K2 J-PARC

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高電圧発生 装置本体 電 圧 導 入 部 絶縁油 セラミック容器 負電極 真空容器

KEK-PS J-PARC

CW-HV Power supply -1

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高電圧発生 装置本体 電 圧 導 入 部 絶縁油 セラミック容器 負電極 真空容器

KEK-PS J-PARC

CW-HV Power supply -1

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高電圧発生 装置本体 電 圧 導 入 部 絶縁油 セラミック容器 負電極 真空容器

KEK-PS J-PARC

CW-HV Power supply -1

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CW-HV Power supply -2

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SLIDE 19

CW-HV Power supply -2

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10-5 10-4 200 250 300 350 400

ガス圧 - 耐電圧 特性曲線

正極 06.01.05 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 負極 06.05.19 負極 06.05.18

He-Ne ガス 導入圧力 [Torr] 印可電圧 [kV]

CW-HV Power supply -2

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SLIDE 21

Assembling-1

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SLIDE 22

Assembling-1

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SLIDE 23

Assembling-2

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SLIDE 24

Assembling-3

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SLIDE 25

Assembling-3

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SLIDE 26

Assembling-3

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SLIDE 27

Assembling-4

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SLIDE 28

Assembling-4

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SLIDE 29

Assembling-5

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SLIDE 30

Assembling-6

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SLIDE 31

Assembling-6

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SLIDE 32

Assembling-6

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SLIDE 33

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

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