HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION

1KEK

Crab Cavity
Cryostat, jacket, etc.
KEKB Crab Cavity Group- presented by NAKAI Hirotaka

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION

2Overview

KEKCryostat design
Status of cryostat manufacturing
Helium jackets
80 K thermal shield

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION

3

KEK

Cryostat Design

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEK4Cryostat Design Concept
Jacket-type liquid helium vessel
Coaxial coupler with bellows forfrequency tuning: 28.3 kHz/mm
Stub support for long coaxial coupler
for mechanical support and cooling ofcoaxial coupler tip

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION

KEK!"#$%&'(5Cryostat Conceptual Design)*$+,#-.$/"-#0'1*1'A-',/;$!-,&,4F;$K7L-H.&,4$M&H.3,/'$234,'.&/$56&'07$
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KEKB Review Committee/20060321@&AB$I'IN2
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8C"./6$*&0.'1<=>$?$@&AB$C&.1"4',$56&'07

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION

6Cooling Scheme (1)KEK53S'.;$%30R'2",&."1$J"1.
@&AB$I'$@'R'0$2'.'1@&AB$I'$85-##0;<I'$%3#"1$8)'.-1,<@&AB$CO$85-##0;<$@&AB$CO$8)'.-1,<@CO$=>?$56&'07$

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KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION

7Cooling Scheme (2)KEK

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KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEK

8Cryostat Design (Side View)

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEK

9Cryostat Design (Top View)

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEK

10

Cryostat Design (Front View)

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEKKEKB Review Committee/20060321

11Cryostat

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION

12KEK

Helium Jacket

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEK13

Assembly of Helium Jacket

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEK

14Heater & Temp. Sensors

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEK

15

Helium Jacket for Cavity

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION

KEK

16

Stub Support in Helium Jacket

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEKKEKB Review Committee/20060321

17Copper Bellows

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEK18Liquid Helium Connection TubeKEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEK

19

Helium Gas Connection TubeKEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEK

20Liquid Helium in Jacket

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION21KEK80 K Liquid Nitrogen
Thermal Shield

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEK22

80 K Thermal Shield Structure?';$G31$85B5B<$!$P$TT
K0-T&,-T@3T&,3.'7$D"0031
8.WQBX$TT<+,H'1.$Z$U'07

K0-T&,-T$=>$?
!6'1T30$56&'07
8.WO$TT<KEKB Review Committee/20060321@&ABC&.1"4',$$$J&#'$5B5B$$$$$!$POBYTTNAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEKKEKB Review Committee/20060321

23

Laminated Collars

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEK24

Assembly of 80 K Thermal Shield

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEK

25Welded 80 K Thermal Shield

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEK

2680 K Thermal Shield

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEK

2780 K Thermal Conduction Strips

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATIONKEK28

Assembly of Cryostat

KEKB Review Committee/20060321

NAKAI Hirotaka

HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION

29

Current Status ….

KEKCryostat design completed andnumerically analyzed
Prototype cryostat for assembly checkand cooling test completed
No leakage
Storage of liquid helium

Two fully-equipped cryostats underconstruction

KEKB Review Committee/20060321

NAKAI Hirotaka