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BTF加速器物理设计


30 2006

2

HIGH

ENERGY

PHYSICS

AND

NUCLEAR

PHYSICS

Vol. 30, Supp. Feb., 2006

BTF
1;1) 1 2 1 2 1 2

*
1 2 2

1( 2(

100049) 100084)

X . BTF BEPC , 1.18GeV X 0.15%

(BTF) ,





BEPC , (photoinjector) ,

, A46 BTF

. 2.5mm·mrad.

1
X ” BEPC . BTF , FEL (1.6ps, 600A) , DL1 , BC2), 10ps , (L0, L1, L2, L3), 1.6ps, 600A, DL2 1, BTF 1.18GeV. A46 . BEPC (BC1, 9nm. (2.5mm·mrad) , (photoinjector) (BTF) , HGHG BTF HGHG “

2

,

, (chicane), RF
[1]

, RF , . , : ( ). BTF
1

BTF , 1.

(R56 )

Ein / Eout / σz-in / σz-out / σδ-in σδ-out GeV L1 L2 L3 GeV nm 0.87 0.87 0.33 0.33 0.12 mm 0.87 0.33 0.33 0.12 0.12 (%) 0.16 1.53 1.53 1.15 1.15 (%) 1.53 1.53 1.11 1.15 0.15 0.136 0.344 0.344 0.70 0.70 0.70 1.18

φrf / (? ) ?29 – ?29.8 – 40

R56 / mm – ?31.5 – ?15 –

BC1 0.344 0.344 BC2 0.70

1

BTF

,

(10575114) * 1) E-mail: zhuxw@mail.ihep.ac.cn

126 — 128

BTF

127

600A,

2.5mm·mrad.

4

X-band
, . , , , CSR , . 11.424GHz L0 L1 BEPC X X RF . X RF , . CSR , . . X . , ,
[1]

, ,

2

3
A5 , , . A10 . A24 ). 2.
2
/MeV (%) /mm (%) /mm / /m /(? )

, A5, A6, A55 , BTF

,

(BC1), A10 (BC2) A25, A26 BC1
BC1
344 1.53 2 ?31.5 3.05 4 0.2 7.28

A27

(

3m,

5
BEPC , , , . DL1 BEPC , , ?15mm, 3. . DL2 1.18GeV , linac ) DL2 , dark current, , beta BEPC 20m, BTF A46 20m, 6m undulator-L3 . 30m, 8
?

(DL1) (DL2)

BC2 chicane,

7.77m,

4 0.335mm(rms) , BC2 , twiss R56 25.7? , BC2
3 BC2
700 1.11 3 ?31.5 7.77 4 0.2 3 (%)

136MeV , DL1 : . ( 17.5? ) 35? , R56 =6.3mm)

0.12mm(rms), BC2 BEPC . BC2 BC2 L3 ,

(

/MeV (%) /mm /mm / /m /(? )

: (CSR

128

( HEP & NP )

30

. BEPC 4 , 4 ,
?

2m, DL2 2 ,
?

4?, , 0.85m,

6 1.8m, R56 ≈5.5mm, , CSR 1.18GeV 0.15% .

, , DL2 2%, ISR
3

6 7
BNL1.6 S-Band 153MeV 1.5mm·mrad 3 A2 A3 A3 . 0.14% 10ps 1nC S-Band , 1— , , DL1 0.15% BEPC Linac BTF HGHG FEL 2.5mm·mrad . , , 1.18GeV , : , BTF

(References)

1 LCLS Concept Design Report, SLAC-R-593, 2002

Concept Design of the BTF Accelerator *
ZHU Xiong-Wei DU Ying-Chao
2 1;1)

PEI Guo-Xi
2

1

CHI Yun-Long

1 2

DAI Jian-Ping

1 2

CHEN Sen-Yu

1 2

HE Xiao-Zhong

HUANG Wen-Hui

LIN Yu-Zheng

TANG Chuan-Xiang

1 (Institute of High Energy Physics,Chinese Academy of Sciences, Beijing 100049, China) 2 (Accelerator Lab., Tsinghua Univesity, Beijing 100084, China)

Abstract Beijing X-ray free electron laser test facility (BTF) will reside in the BEPC

Linac, which is the best

electron linac in China. The BTF will not use the existing DC gun pre-injector, but use photoinjector to obliquely inject beam to the main linac of the BEPC . At the same time, three accelerator sections will be removed in order to install two magnetic compressors to compress the electron bunch. After the accelerator section A46, the beam is extracted and injected to the undulator through high energy transport line. The BTF will provide the electron beam with the energy of 1.18GeV, the energy spread of 0.15%, and the normalized emittance of less than 2.5mm·mrad. Key words X-ray FEL, photoinjector, magnetic compressor, transport line

*Supported by NSFC(10575114) 1) E-mail: zhuxw@mail.ihep.ac.cn


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