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ELECTROSTATIC SEPARATORS AT THE J-PARC HADRON HALL
Michifumi Minakawa , Masaharu Ieiri, Keizo Agari, Yohji Katoh, Erina Hirose, Ryotaro Muto, Megumi Naruki,
Yoshinori Sato, Yoshihisa Shirakabe, Yoshihiro Suzuki, Shin’ya Sawada, Hitoshi Takahashi, Kazuhiro Tanaka,
Akihisa Toyoda, Yutaka Yamanoi, and Hiroaki Watanabe
IPNS, KEK, Oho 1-1, Tsukuba, Ibaraki 305-0801, Japan
Abstract Electrostatic (ES) separators to select and deliver below 2GeV/c secondary beam are launched out at the secondary
beam line at the high intensity proton accelerator facility (J-PARC). The ES separator will generate a 75kV/cm electrostatic field between parallel electrodes along the beam direction. It is designed so as to be radiation-proof and to lower spark rate comparing with the present separators. A checkout by measuring K-/π- ratio of the line has been performed.
J-PARC
1. K
(ES(Electrostatic) )
[1] ES
ES
• m30cm
10 15 cmSUS
+300kV -300kV
• 1 10-4 Pa He 1 10-9
Pa m3 sec. •
ES
•
Ne-He1 10-2 Pa
•
2. J-PARC
K1.8 K1.1BR KKL
1 .
K1.8 2GeV/c6m ES
K
K[2] ES
ESS2
ESS1
K1.1BR area
KL area
K1.8
KL
T1 target beam
dump
30GeV protons
K1.8BR area K1.8 area
K1.1BR
ESS
____________________________________________ #[email protected]
Proceedings of the 8th Annual Meeting of Particle Accelerator Society of Japan (August 1-3, 2011, Tsukuba, Japan)
- 330 -
(CM1-CM4)ES
K1.8ES (D3)
K1.8BR
2 IF
MS1,MS2 1
K1.1BR 1.1GeV/c2m ES
K1.1ES K1.8
K0
S
KK1.8
K1.1BR ES
[3]
3.
ES
J-PARC
[4]
3.1
EPT O-O-
( )
FRPFiber Reinforced Plastics
FRP
FRP
400kV
3
3.2
R11
4
Proceedings of the 8th Annual Meeting of Particle Accelerator Society of Japan (August 1-3, 2011, Tsukuba, Japan)
- 331 -
R30
0.05 0.2
3.3
SUS
t=10R1=8 R2=2 ES
25% (5(a) (b))
(a) (b) J-PARC
5 ANSYS
6 SUS SUS
SUS 50mmSUS 100mm 0.35mm
Proceedings of the 8th Annual Meeting of Particle Accelerator Society of Japan (August 1-3, 2011, Tsukuba, Japan)
- 332 -
4. ES ES 3m
6m
100mm
0.5mm
5. ES
6mES 3m
5mm
6m5.5m
7(pole) (pivot)
8 K1.8
6. K1.8BR K1.8 K1.1BR ES
K1.8BR 0.75GeV/c ES
200kV
- K-
K1.8 1.8GeV/c ES
200kV 4K
KK
ES K
K1.1BR0.8GeV/c K+
K K.14
pole
pivot
pole
pole
Proceedings of the 8th Annual Meeting of Particle Accelerator Society of Japan (August 1-3, 2011, Tsukuba, Japan)
- 333 -
9 K1.8BR 0.75GeV/c
ES 200kV
- K-
10 K1.8 1.8GeV/c ES
200kV 4
K
K
ES
(a) ES (b)
K
11 K1.1BR 0.8GeV/c K+
K K .14
K1.8BR
K1.8
ESK1.1BR
K
ES
K1.8BR K1.8 K1.1BR
J-PARC E17 E19E06
(B) (21340071)
[1] A. Yamamoto et al., Nucl. Instr. and Meth.
148(1978)203-207; A. Yamamoto et al., Nucl. Instr. and Meth. 203(1982)35-43; S. Kurokawa et al., Nucl. Instr. and Meth. 212(1983)91-100; M. Takasaki et al., Nucl. Instr. and Meth. A242(1986)201-207.
[2] P. H. Pile et al., Nucl. Instr. and Meth. A321(1992)48-5.
[3] K. H. Tanaka et al., Nucl. Instr. and Meth. A363(1995)114-119.
[4] M. Ieiri et al., Nucl. Instr. and Meth. B266 (2008) 4205-4208.; M. Ieiri et al., Int’l Particle Accelerator Conf. (2010) THPEC045.
(a) ESS1 off ESS2 off ʻKʼtrigger
(b) ESS1 on ESS2 on ʻKʼtrigger
Proceedings of the 8th Annual Meeting of Particle Accelerator Society of Japan (August 1-3, 2011, Tsukuba, Japan)
- 334 -