JAEA

-Technology

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JAEA-Technology

2008-004

Evaluation of Characteristics of Race-track Bellows

渡辺 真朗　荻原 徳男　澤 宗司*　田中 俊弘*

日本原子力研究開発機構

J-PARCセンター加速器ディビジョン

Accelerator DivisionJ-PARC Center

February 2008

Japan Atomic Energy Agency

Masao WATANABE, Norio OGIWARA, Soji SAWA* and Toshihiro TANAKA*

JAEA

-Technology 2008-004 　レーストラックベローズの特性評価

日本原子力研究開発機構

レーストラックベローズの特性評価

http://www.jaea.go.jp/index.shtml

319-1195 2 4

029-282-6387, Fax 029-282-5920

319-1195 2 4

This report is issued irregularly by Japan Atomic Energy Agency Inquiries about availability and/or copyright of this report should be addressed to Intellectual Resources Section, Intellectual Resources Department, Japan Atomic Energy Agency 2-4 Shirakata Shirane, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195 Japan Tel +81-29-282-6387, Fax +81-29-282-5920

© Japan Atomic Energy Agency, 2008

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JAEA-Technology　2008-004

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JAEA-Technology 2008-004

J-PARC

J-PARC 3GeV

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JAEA-Technology　2008-004

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JAEA-Technology 2008-004

Evaluation of Characteristics of Race-track Bellows

Masao WATANABE, Norio OGIWARA, Soji SAWA and Toshihiro TANAKA

Accelerator Division, J-PARC Center, Japan Atomic Energy Agency

Tokai-mura, Naka-gun, Ibaraki-ken

(Received January 8, 2008)

At the extraction part of J-PARC 3 GeV Rapid Cycling Synchrotron, a race-track bellows is required between the vacuum chamber of extraction septum magnet 1 and 2, because there is no space to install a circular bellows. However, formed titanium bellows with race-track shape have never been fabricated. Small size formed titanium race-track bellows were fabricated. Characteristics of them were measured and evaluated. Spring force measurements, expansion/contraction repetition life test, vacuum heating test and He-gas leak test were performed. The characteristics of the race-track bellows are satisfied with our use conditions. We obtained a prospect that actual size race-track bellows could be used.

Keywords: Race-track, Formed Titanium Bellows, J-PARC, 3 GeV Rapid Cycling Synchrotron, Extraction Septum Magnet

Osaka Rasenkan Kogyo Co.,Ltd.

iii

1. ---------------------------------------------------------------------------------------------------------- 2. ------------------------------------------------------------------

2.1 ---------------------------------------------------------------------- 2.2 ------------------------------------------------------------------------------------------------- 2.3 -------------------------------------------------------------------------------------------------

2.3.1 -------------------------------------------------------------------------------------------- 2.3.2 ----------------------------------------------------------------------------------- 2.3.3 ----------------------------------------------------------------------------- 2.3.4 -------------------------------------------------------------------------------------- 2.3.5 -------------------------------------------------------------------------------------- 2.3.6 -----------------------------------------------------------------------------

3. ---------------------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------------------- A. ---------------------------------------------------------------------------------------

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Contents

1. Introduction ------------------------------------------------------------------------------------------------ 2. Measurements of Characteristics of Race-track Bellows --------------------------------------

2.1 Specifications of Race-track Bellows -------------------------------------------------------------- 2.2 Measurement Items ------------------------------------------------------------------------------------ 2.3 Measurement Results ---------------------------------------------------------------------------------

2.3.1 Dimension Measurements ---------------------------------------------------------------------- 2.3.2 Measurements of Spring Force in Axial Direction --------------------------------------- 2.3.3 Measurements of Spring Force in Perpendicular Direction to an Axis ------------ 2.3.4 Expansion/Contraction Repetition Life Test ----------------------------------------------- 2.3.5 Vacuum Heating Test ----------------------------------------------------------------------------- 2.3.6 He-gas Leak Test ----------------------------------------------------------------------------------

3. Concluding Remarks ------------------------------------------------------------------------------------- Acknowledgements --------------------------------------------------------------------------------------------- References -------------------------------------------------------------------------------------------------------- Appendix A. Calculation Expressions of Spring Force ---------------------------------------------

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1.

J-PARC 3GeV RCS 3GeV8 3 1) 2)

Main Ring MR RCSFig.1 3

Fig.2 SUS3)4)

(150 ) 420240mm

RCS

2.

2.1

Fig.3

80 100 120

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140

2.2

2.3 2.3.1

Fig. Table 1 Table 2Photo.1

2.3.2

Photo.2

Fig.5

0.7

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2.3.3

Photo.3

Fig.6

2.3.4

Photo.4

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2.3.5

Photo.5 Photo.6Photo.7

2.3.6

Photo.8

3.

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1) M. Watanabe et al. : “ 1Design of Thick Septa Magnets Based on 3D Field Calculation for the 3 GeV Rapid Cycling Synchrotron of J-PARC”, IEEE Transactions on applied superconductivity, Vol.16, No.2, June 2006, p1350-1353.

2) M. Yoshimoto et al. : “ 2 HDesigns of Septum Magnet at 3 GeV RCS in J-PARC”, Proc. of EPAC2006 (2006), p1768.

3) M. Takasaki, et al. : “Guidelines in Safety Design of Accelerator Components and Facilities at High Radiation Fields”, KEK-Internal 97-17, September 1997.

4) Y. Saito. : “General Guidelines of Vacuum System of Modern Accelerators”, (2001),available from 3 Hhttp://www-accps.kek.jp/~uota/works/.

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Fig.1 RCS

Fig.2

Fig.3

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Fig.4

Table 1

Table 2

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Photo.1

Photo.2

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Fig.5

(a) 1mm (b) 1mmPhoto.3

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Fig.6

(a) 1000 (b) 10000Photo.4

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(a) (b)Photo.5 15

(a) (b)Photo.6 200

(a) (b)Photo.7 250

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Photo.8

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A.

2.3.2 2.3.3

1mm xF (N)

x xF K (1)

1mm ( )ycom shF (N)

( ) ( )( ) ( ) ( )

( )

2 m long m shycom sh y sh y sh

m sh

D DF F F

D (2)

1 2

1mm ( )ycom longF (N)

( ) ( )( ) ( ) ( )

( )

2 m long m shycom long y long y long

m long

D DF F F

D (3)

1 2

K 1 x 1 ( )y shF ( )y longF

( )m shD ( )m longD

N 1mmN/mm

3

2.5

23 / 2

mED tKW

(4)

2m y

y

KDF

L (5)

2xXn

(6)

32 1/ 1

my

D Yn L l L

(7)

y (mm) 1 (1) (7)

Table A-1

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Fig. A-1

Table A-1

mm 0 0 1mm 1 1 1mm 0.3 0.3 0.3mm 13.53 12.10 12.62

mm 90.88(D m (sh ))

129.25(D m (long ))

115.31

10 10 10

mm 64 64 64

mm 20 20 20

N/mm 295.08 419.69 374.41

N/mm2 107000 107000 107000

x mm 0 0 0.05

y mm 0.15 0.21 0.19

F x N - - 18.72

F y N 31.64(F y (sh ))

91.04(F y (long ))

-

F ycom N 40.15(F ycom (sh ))

73.82(F ycom (long ))

-

Fig. A-1

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